Journal articles on the topic 'Restorative and prosthodontics margins'
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Spitznagel, F. A., J. Boldt, and P. C. Gierthmuehlen. "CAD/CAM Ceramic Restorative Materials for Natural Teeth." Journal of Dental Research 97, no. 10 (June 15, 2018): 1082–91. http://dx.doi.org/10.1177/0022034518779759.
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Advances in computer-aided design (CAD) / computer-aided manufacturing (CAM) technologies and their ease of application enabled the development of novel treatment concepts for modern prosthodontics. This recent paradigm shift in fixed prosthodontics from traditional to minimally invasive treatment approaches is evidenced by the clinical long-term success of bonded CAD/CAM glass-ceramic restorations. Today, defect-oriented restorations, such as inlays, onlays, and posterior crowns, are predominately fabricated from glass-ceramics in monolithic application. The variety of CAD/CAM ceramic restorative systems is constantly evolving to meet the increased demands for highly aesthetic, biocompatible, and long-lasting restorations. Recently introduced polymer-infiltrated ceramic network CAD/CAM blocks add innovative treatment options in CAD/CAM chairside 1-visit restorations. The material-specific high-edge stability enables the CAD/CAM machinability of thin restoration margins. Full-contour zirconia restorations are constantly gaining market share at the expense of bilayered systems. Advancements in material science and bonding protocols foster the development of novel material combinations or fabrication techniques of proven high-strength zirconia ceramics. CAD/CAM applications offer a standardized manufacturing process resulting in a reliable, predictable, and economic workflow for individual and complex teeth-supported restorations. More evidence from long-term clinical studies is needed to verify the clinical performance of monolithic polymer-infiltrated ceramic network and zirconia teeth-supported minimally invasive and extensive restorations.
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Nimbalkar-Patil, Smita P., and Aamod B. Karandikar. "Multidisciplinary Treatment Approach to Restore Deep Horizontally Fractured Maxillary Central Incisor." Journal of Contemporary Dental Practice 15, no. 1 (2014): 112–15. http://dx.doi.org/10.5005/jp-journals-10024-1498.
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ABSTRACT This case report demonstrates sequential Periodontic, Orthodontic and Prosthodontic treatment modalities to save and restore deep horizontally fractured maxillary central incisor. The location of fracture was deep in the mucosa which reveals less than 2 mm of tooth structure to receive the crown. The procedures like surgical crown lengthening, endodontic post placement, orthodontic forced eruption, core build-up and metal-ceramic crown restoration were sequentially performed to conserve the fractured tooth. Forced eruption is preferred to surgical removal of supporting alveolar bone, since forced eruption preserves the biologic width, maintains esthetics, and at the same time exposes sound tooth structure for the placement of restorative margins. How to cite this article Patil PG, Nimbalkar-Patil SP, Karandikar AB. Multidisciplinary Treatment Approach to Restore Deep Horizontally Fractured Maxillary Central Incisor. J Contemp Dent Pract 2014;15(1):112-115.
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Verma, Sanjan, Tarun Kalra, Manjit Kumar, Ajay Bansal, Ritu Batra, and Abhishek Avasthi. "To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study." Dental Journal of Advance Studies 8, no. 03 (August 30, 2020): 115–26. http://dx.doi.org/10.1055/s-0040-1716315.
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Abstract Introduction Provisional restoration is a critical component of fixed prosthodontics treatment, which must satisfy many inter-relative factors such as biological, mechanical, and esthetic. These restorations should have accurate marginal adaptation and optimum strength to maintain functional demands. The present “in vitro” study was conducted to evaluate the effect of water temperature and duration of immersion, on the marginal adaptation and microhardness of four different commercially available provisional restorative materials. Materials and Methods The 240 specimens were then seated on the stainless-steel die which simulated the prepared tooth, and evaluated for the marginal gap for four different provisional restorative materials and divided into four different groups A, B, C, and D. Each group was further divided into six subgroups according to temperature of water and time of immersion. In each group the samples were immersed in water at 20, 30, and 40 degrees, respectively for 5 and 10-minutes duration. Four different temporary restorative materials for crown fabrication were loaded each time to make temporary crowns. Results Each sample was placed under travelling stereoscopic microscope (20× magnification) and photographed. Results for each surface were obtained, and the average of three surfaces was calculated. Knoop hardness was measured using a microhardness tester. The study was subjected to statistical analysis, to know the statistical significance, of the effect of difference in time and temperature changes at the time of final polymerization on surface microhardness and marginal integrity of four different provisional restorative materials. Discussion The mean marginal discrepancies of bis-GMA (group B) at 20, 30, and 40°C for 5 and 10 minutes in water were smaller than the results of other groups. Microhardness evaluation showed that the poly ethyl methacrylate (PEMA) type resin exhibited significantly lower microhardness than the bis-acryl resin composites (Protemp 4 and Systemp.c&b) at both time and temperature intervals. Conclusion The bis-acryl composites material has the least marginal discrepancy in comparison with PEMA and polymethyl methacrylate (PMMA). The bis-acryl composites materials exhibit superior surface microhardness followed by PEMA and PMMA.
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Afzal, Hadiqa, Naseer Ahmed, Abhishek Lal, Khulud A. Al-Aali, Mohammed Alrabiah, Mai M. Alhamdan, Ahmed Albahaqi, Abdulaziz Sharaf, Fahim Vohra, and Tariq Abduljabbar. "Assessment of Communication Quality through Work Authorization between Dentists and Dental Technicians in Fixed and Removable Prosthodontics." Applied Sciences 12, no. 12 (June 20, 2022): 6263. http://dx.doi.org/10.3390/app12126263.
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Fabrication of a clinically successful dental prosthesis requires clear and effective communication between dentists and dental technicians. Adequate completion of work authorization by dentists provides a means for increased professional quality assurance and satisfaction in dental prosthesis. The aim of this study was to evaluate the quality of communication between dentists and dental technicians via work authorization for fixed and removable dental prosthesis in Pakistan. This cross-sectional study was conducted for a period of 6 months to assess the quality of communication between dentists and dental technicians. A well-constructed questionnaire regarding work authorization of removable and fixed prostheses was used as a tool to collect data from 453 dentists. A linear regression analysis was performed to evaluate the relationship of the independent and dependent variables. A p value of ≤0.05 was considered statistically significant. It was observed that 92.1% of the dentists leave removable partial denture design to the dental technicians. About 56.5% of the dentists indicated information about base retention of partial dentures in work authorization. The majority of the dentists (56.5%) mentioned the material to be used for the construction of casting partial dentures. Nearly 66% of the dentists indicated the design of margins, and 44.6% of the dentists did not select the shade for fixed prostheses. Nearly 43% of the dentists did not draw the design of restoration, 21.9% chose to draw the design on paper, and 32.2% of the dentists drew the design on the cast. Meanwhile, 76.8% of the participants chose to directly communicate with their dental technicians personally. Nearly 41% of the dentists were satisfied with the restoration design, and 13.5% of the participants were not satisfied with the designs. Poor communication between dentists and technicians was observed, as the majority of the design decisions were left to the dental technicians. Therefore, communication between dentists and dental technicians should be improved by conducting combined workshops for the successful construction of dental prostheses.
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Bernauer, Selina A., Johannes Müller, Nicola U. Zitzmann, and Tim Joda. "Influence of Preparation Design, Marginal Gingiva Location, and Tooth Morphology on the Accuracy of Digital Impressions for Full-Crown Restorations: An In Vitro Investigation." Journal of Clinical Medicine 9, no. 12 (December 9, 2020): 3984. http://dx.doi.org/10.3390/jcm9123984.
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(1) Background: Intraoral optical scanning (IOS) has gained increased importance in prosthodontics. The aim of this in vitro study was to analyze the IOS accuracy for treatment with full crowns, considering possible influencing factors. (2) Methods: Two tooth morphologies, each with four different finish-line designs for tooth preparation and epi- or supragingival locations, were digitally designed, 3D-printed, and post-processed for 16 sample abutment teeth. Specimens were digitized using a laboratory scanner to generate reference STLs (Standard Tessellation Language), and were secondary-scanned with two IOS systems five times each in a complete-arch model scenario (Trios 3 Pod, Primescan AC). For accuracy, a best-fit algorithm (Final Surface) was used to analyze deviations of the abutment teeth based on 160 IOS-STLs compared to the reference STLs (16 preparations × 2 IOS-systems × 5 scans per tooth). (3) Results: Analysis revealed homogenous findings with high accuracy for intra- and inter-group comparisons for both IOS systems, with mean values of 80% quantiles from 20 ± 2 μm to 50 ± 5 μm. Supragingival finishing lines demonstrated significantly higher accuracy than epigingival margins when comparing each preparation (p < 0.05), whereas tangential preparations exhibited similar results independent of the gingival location. Morphology of anterior versus posterior teeth showed slightly better results in favor of molars in combination with shoulder preparations only. (4) Conclusion: The clinical challenge for the treatment with full crowns following digital impressions is the location of the prospective restoration margin related to the distance to the gingiva. However, the overall accuracy for all abutment teeth was very high; thus, the factors tested are unlikely to have a strong clinical impact.
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Pontoriero, Denise Irene Karin, Simone Grandini, Gianrico Spagnuolo, Nicola Discepoli, Stefano Benedicenti, Valerio Maccagnola, Alberto Mosca, Edoardo Ferrari Cagidiaco, and Marco Ferrari. "Clinical Outcomes of Endodontic Treatments and Restorations with and without Posts Up to 18 Years." Journal of Clinical Medicine 10, no. 5 (February 25, 2021): 908. http://dx.doi.org/10.3390/jcm10050908.
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Background: The aim of this study was to collect long-term restorative and endodontic outcomes of endodontically treated teeth (ETT). Methods: 298 teeth were included in the study and were recalled up to 18 years with a media of 10.2 years. At baseline, 198 sample teeth (66.44%) showed symptoms and 164 (55%) had periapical radiolucency. The most frequently used obturation techniques were warm gutta-percha in 80% of cases, and by carrier in 20%. A total of 192 ETT were restored by direct resin composite restorations, and 106 posts were luted. Moreover, 75 (25.16%) direct restorations remained as final restorations, 137 single crowns (45.97%), 42 (14.09%) partial adhesive crowns, and 42 (14.09%) abutments of fixed bridges were the final treatments. Descriptive and inferential statistics were performed (α = 0.05). A Cox regression model was made. Results: results showed success for 92.6% of ETT up to 18 years, 2.68% (8 ETT) showed irreversible failures, and 14 (4.69%) reversible complications. Four ETT (1.34%) failed because of root fracture and the other four (1.34%) because of endodontic complications. Eight ETT (2.69%) showed non-irreversible periodontal complications and the other six (2.01%) prosthodontic complications. Accordingly, with Kaplan–Meier analysis, the survival rate after 18 years was 97.3% (Interval of Confidence (IC) 95.1–98.3). The presence of a short or long (at least 1 mm related to radiographic apex) quality endodontic filling displayed a statistically significant higher risk of complication (hazard ratio (HR) = 17.00 (IC 5.68–56.84). Furthermore, a clinically detectable not precise coronal margins predicts the presence of any clinical complication with a hazard ratio almost seven times higher than endodontically treated teeth with a proper margin (HR = 6.89 (IC 2.03–23.38)), while the presence of lucency at the baseline did not affect the risk of complication (HR = 0.575 (IC 0.205–1.61)). The presence of post, tooth position in the arch, and the type of it did not show a high-risk rate (HR = 1.85, 1.98, and 2.24, respectively). Conclusions: a correct filling (at the apex) of root canals combined with proper coronal margins allow obtaining a long-term high success rate in teeth with a periapical lesion at the baseline. The use of a post or not, when its placement is related to the residual amount of the crown, does not change the final outcome of the ETT.
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Christensen, Gordon J. "Implant Prosthodontics Contribute to Restorative Dentistry." Journal of the American Dental Association 121, no. 3 (September 1990): 340–50. http://dx.doi.org/10.14219/jada.archive.1990.0160.
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Nikolov, V. V., D. M. Korol, D. D. Kindiy, and M. D. Korol. "DETERMINATION OF CHEWING EFFICIENCY IN PATIENTS WITH RESTORED TOOTH CROWN PART." Ukrainian Dental Almanac, no. 1 (March 23, 2021): 64–68. http://dx.doi.org/10.31718/2409-0255.1.2021.10.
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Supporting teeth preservation at the restoration of dentition defects with the help of fixed porcelain fused metal dentures is considered one of the most important issues of prosthodontics.
Margin line preparation strategies are still disputable nowadays. In most cases preparation is confined to the ledge creation. Its function is to provide a smooth transition of orthopedic restoration to a tooth root and prevent the traumatization of marginal paradontium.
These issues are gaining a momentum when the possibility of manufacturing fixed prosthesis with the use of partially or completely ruined teeth with the preserved root as a support appears.
Since the opportunities of thermal method for gingiva retraction and marginal line formation around the supporting teeth are not studied enough in modern scientific sources, our research aims to define the mastication efficiency state in patients of sample groups after the fixation of dentures on the supporting teeth prepared for prosthesis with the help of diathermocoagulation and mechanical retraction.
The authors of the article have determined the mastication efficiency in the patients with the restored tooth crown. Altogether 54 patients of two sample groups aged from 20 to 60 years and above with completely ruined tooth crowns were examined. Their soft tissues around the supporting teeth were prepared for the fixed prosthesis manufacturing.
The first sample group involved 29 patients that made up 53.7% of general studied population. Their supporting teeth gingiva margins were retracted with the help of diathermocoagulation while preparing them for the fixed dentures. While the gingiva margins of the patients of the second sample group, consisting of 25 people (46.3% of general studied population), were retracted with the help of cotton Ultrapak cord, produced by Ultradent (the USA). It is offered in several size options.
Mastication efficiency state after prosthesis was determined with the help of mastication test (Ukrainian Utility Patent # 94841). In this case, mastication index was the main diagnostic tool. It was received with the help of computer analysis of digital samples in software “Adobe Photoshop Extended”.
The analysis of the dynamics of mastication test indices of the patients of sample group 1 delivered typical results. In a week after the fixation of fixed porcelain fused metal dentures, the reduction of the mean value of mastication test index by 0.2 was fixed. The verification of these changes according to the statistical significance showed positive result (at p = 0.0004). At the same time, the verification of the changes, occurred during the period from the 7th to the 30th day after the fixation of dentures in patients of sample group 1, with the help of Wilcoxon test showed that at p = 0.9 the reduction of the mean value to 5.148 had no statistical significance.
While the dynamics of mastication test changes in sample group 2 looked as follows. The reduction of the mean values of mastication test index from 5.184 to 5.112 was observed. So, the spread between the values received before the retraction and in seven days after crown fixation made up 0.072. The conducted statistical verification of these changes (at p = 0.01) proved their statistical significance. In contrast, the collation of the indices received after seven days of denture fixation and in 30-days period after it (from 5.112 to 5.132) at p = 0.961 demonstrated changes at the level of statistical error.
According to the received research results, prosthesis with the fixed porcelain fused metal dentures promotes patients’ mastication efficiency restoration. That is traced in the reduction of the mastication test index values received after the 7th day of crown fixation in both sample groups. It should be noted here, that statistically significant difference between the indices of the patients of sample group 1 and 2 was not found. On the 30th day of denture fixation, mastication efficiency indices remained almost the same.
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Srimaneepong, Viritpon, Artak Heboyan, Muhammad Sohail Zafar, Zohaib Khurshid, Anand Marya, Gustavo V. O. Fernandes, and Dinesh Rokaya. "Fixed Prosthetic Restorations and Periodontal Health: A Narrative Review." Journal of Functional Biomaterials 13, no. 1 (February 1, 2022): 15. http://dx.doi.org/10.3390/jfb13010015.
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Periodontal health plays an important role in the longevity of prosthodontic restorations. The issues of comparative assessment of prosthetic constructions are complicated and not fully understood. The aim of this article is to review and present the current knowledge regarding the various technical, clinical, and molecular aspects of different prosthetic biomaterials and highlight the interactions between periodontal health and prosthetic restorations. Articles on periodontal health and fixed dental prostheses were searched using the keywords “zirconium”, “CAD/CAM”, “dental ceramics”, “metal–ceramics”, “margin fit”, “crown”, “fixed dental prostheses”, “periodontium”, and “margin gap” in PubMed/Medline, Scopus, Google Scholar, and Science Direct. Further search criteria included being published in English, and between January 1981 and September 2021. Then, relevant articles were selected, included, and critically analyzed in this review. The margin of discrepancy results in the enhanced accumulation of dental biofilm, microleakage, hypersensitivity, margin discoloration, increased gingival crevicular fluid flow (GCF), recurrent caries, pulp infection and, lastly, periodontal lesion and bone loss, which can lead to the failure of prosthetic treatment. Before starting prosthetic treatment, the condition of the periodontal tissues should be assessed for their oral hygiene status, and gingival and periodontal conditions. Zirconium-based restorations made from computer-aided design and computer-aided manufacturing (CAD/CAM) technology provide better results, in terms of marginal fit, inflammation reduction, maintenance, and the restoration of periodontal health and oral hygiene, compared to constructions made by conventional methods, and from other alloys. Compared to subgingival margins, supragingival margins offer better oral hygiene, which can be maintained and does not lead to secondary caries or periodontal disease.
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Jain, Veena, Gunjan Pruthi, and Hema Agnihotri. "Rehabilitation of a Severely Worn Dentition using Fixed and Removable Partial Overdenture Prostheses." International Journal of Prosthodontics and Restorative Dentistry 1, no. 1 (2011): 59–64. http://dx.doi.org/10.5005/jp-journals-10019-1011.
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ABSTRACT Planning and executing the restorative rehabilitation of a severely worn dentition is probably one of the most intellectually and technically demanding tasks faced by the restorative dentist. This article describes the rehabilitation of a 55-year-old male patient with severe loss of tooth structure. The maxillary arch was restored using fixed restorations and the mandibular arch using the integration of fixed and removable prosthodontics. The integration of fixed and removable prosthodontics in a partially dentate patient poses a challenge as well as an opportunity for the use of a partial overdenture.
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Regish, K. M., Deeksha Sharma, and D. R. Prithviraj. "Techniques of Fabrication of Provisional Restoration: An Overview." International Journal of Dentistry 2011 (2011): 1–5. http://dx.doi.org/10.1155/2011/134659.
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A properly fabricated provisional restoration is important in achieving a successful indirect restoration. The importance of provisional restorations as an integral part of fixed prosthodontic treatment is evident from the abundance of the literature pertaining to their importance regarding margin fidelity, function, occlusion, and esthetics. There are a variety of techniques available to suit the individual needs of the clinician and of the clinical situation, from a single unit to a complete-arch provisional fixed prostheses.
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King, Paul. "Restorative dentistry – what's it all about?" Bulletin of the Royal College of Surgeons of England 89, no. 9 (October 1, 2007): 327. http://dx.doi.org/10.1308/147363507x239217.
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The specialty of restorative dentistry encompasses the monospecialties of endodontics, periodontics and prosthodontics, and involves the provision of care and advice for patients with complex problems associated with restoring satisfactory oral and dental function and aesthetics. Restorative dentistry has been recognised within the UK for nearly 25 years, becoming the third dental specialty along with the pre-existing specialties of oral and maxillofacial surgery and orthodontics in 1973.
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Cato, J. "Book review: Functional Occlusion in Restorative Dentistry and Prosthodontics." British Dental Journal 220, no. 5 (March 2016): 225. http://dx.doi.org/10.1038/sj.bdj.2016.170.
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Shi, Hao Yu, Runxuan Pang, Jing Yang, Di Fan, HongXin Cai, Heng Bo Jiang, Jianmin Han, Eui-Seok Lee, and Yunhan Sun. "Overview of Several Typical Ceramic Materials for Restorative Dentistry." BioMed Research International 2022 (July 18, 2022): 1–18. http://dx.doi.org/10.1155/2022/8451445.
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With the development of ceramic technology, prosthodontic ceramics are becoming a useful option for improving esthetic outcomes in dentistry. In this paper, various ceramic materials were reviewed and evaluated, and their advantages and disadvantages and indications in oral prosthodontics were analyzed objectively. The properties of resin-based ceramics, polycrystalline ceramics, and silicate ceramics were compared and analyzed. Resin-based ceramics may replace other ceramic materials in the CAD/CAM field.
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Salma, Mst Ummay, Mohammad Arifur Rahman, Fatema Jannath, Nihar Sultana, and Mohammad Anayet Hossain. "Impact of Full Veneer Crown Restoration on the Periodontal Health of Posterior Teeth." Journal of Bangladesh College of Physicians and Surgeons 41, no. 1 (December 31, 2022): 46–52. http://dx.doi.org/10.3329/jbcps.v41i1.63259.
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Background: Periodontal health plays a vital role in the longevity of prosthodontic restorations. Full veneer crown (FVC) is one of the most common modalities in restoration of single tooth for preservation of function and health of oral tissues. Objectives : The study was done to critically evaluate the impact of FVC restoration providing standard procedures on the periodontal health of posterior teeth, also to observe the changes of periodontal health in terms of their status of gingival index, plaque index, periodontal pocket depth, bleeding on probing in different stages of treatment. Materials & Methods: This prospective study evaluated the impact of FVC on periodontal health of 30 endodontically treated posterior teeth with FVC and 30 contralateral natural teeth of 19 patients in different stages of treatment for 2 years duration in the Dept. of Prosthodontics, Bangabandhu Sheikh Mujib Medical University (BSMMU) Hospital. To assess the periodontal health gingival index, plaque index, periodontal pocket depth, bleeding on probing were used. Collected data were analyzed using SPSS software (version 22) according to the study Objectives Results: The study Result showed that the mean differences of gingival index and plaque index between abutments and contraleteral natural teeth were non significant (p > 0.05) at baseline, 4th month visit; but the differences were significant (p < 0.05) at 8th month, 12th month visits. Regarding periodontal pocket depth the mean differences between abutments and contraleteral natural teeth found non significant (p > 0.05) throughout the follow up period. Same thing observed in bleeding on probing except 12th month follow up visit, where highly significant (p < 0.01) mean differences observed. Also the study found that the gingival index, plaque index, bleeding on probing, periodontal pocket depth increased a bit in 4th,8th,12th month visits gradually in abutments, which was almost same in contralateral natural teeth in case of gingival index, periodontal pocket depth; and increased a bit in case of plaque index, bleeding on probing. Conclusion : If the FVC is fabricated maintaining all standard procedures equigingival margin with proper marginal adaptation, oral hygiene as well as general health of the patient is maintained although less but there is a chance of detrimental effects on periodontal health in comparison to contralateral natural teeth. J Bangladesh Coll Phys Surg 2023; 41: 46-52
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Editoral, E. "Corrigendum for article: Root canal treatment from patients’ perspective: Knowledge, awareness, and expectations." Vojnosanitetski pregled 79, no. 5 (2022): 532. http://dx.doi.org/10.2298/vsp2205532e.
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In the original article titled "Root canal treatment from patients? perspective: knowledge, awareness, and expectations" by Muhammad Qasim*, Omair Anjum?, Gotam Das?, Fariha Naz*, Saima Razaq Khan?, Abdul Razzaq Ahmed?, Saurabh Chaturvedi?, published in the April 2022 print issue of the Vojnosanitetski pregled (Vojnosanit Pregl 2022; 79(4): 325-329); https://doi.org/10.2298/VSP200825112Q), there are errors in affiliations. Instead of the existing affiliations: King Khalid University, College of Dentistry, *Department of Restorative Dental Sciences, ?Department of Prosthodontics, Abha, Saudi Arabia; Lahore Medical and Operative Dentistry, ?Department of Science of Dental Materials, ?Department of Operative Dentistry, Lahore, Pakistan, there should be: King Khalid University, College of Dentistry, *Department of Restorative Dental Sciences (Operative Dentistry), ?Department of Prosthodontics, Abha, Saudi Arabia; Lahore Medical and Dental College, ?Department of Science of Dental Materials, ?Department of Operative Dentistry, Lahore, Pakistan. <br><br><font color="red"><b> Link to the corrected article <u><a href="http://dx.doi.org/10.2298/VSP200825112Q">10.2298/VSP200825112Q</a></b></u>
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Kanoun, Sana, Wiem Ben Amor, Ines Dallel, Samir Tobji, and Adel Ben Amor. "About a Multidisplinary Approach for the Management of Hypodontia: Case Report." Saudi Journal of Oral and Dental Research 7, no. 11 (November 18, 2022): 307–11. http://dx.doi.org/10.36348/sjodr.2022.v07i11.008.
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Hypodontia is a congenital absence of one or more teeth. It is a common malformation with a variable etiology. Early diagnosis and multidisciplinary intervention is required to reach an optimal outcome. Orthodontic treatment is often required to manage space and facilitate later restorative treatment. This article describes a multidisciplinary treatment approach for congenitally missing maxillary lateral incisor and second premolars involving orthodontics and prosthodontics specialties.
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Sood, Sonali, Vinaya Bhat, DKrishna Prasad, and Aruna Bhat. "Role of colors in prosthodontics: Application of color science in restorative dentistry." Indian Journal of Dental Research 22, no. 6 (2011): 804. http://dx.doi.org/10.4103/0970-9290.94675.
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Khier, Salwa, and Khamis Hassan. "Efficacy of Composite Restorative Techniques in Marginal Sealing of Extended Class V Cavities." ISRN Dentistry 2011 (October 3, 2011): 1–5. http://dx.doi.org/10.5402/2011/180197.
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Objectives. To compare the efficacy of three placement techniques in marginal sealing of Class V composite restorations extending onto the root. Materials and Methods. Class V cavities were prepared on buccal surfaces of 30 extracted human molars, with gingival margins 1.5 mm on the root. Prepared teeth were randomly assigned into 3 groups of 10 each and restored with Single Bond/Filtek Supreme using following techniques; Group I: oblique; Group II: occlusogingival; and Group III: split-increment. After restoration finishing, teeth were thermocycled, and immersed in 2% methylene blue dye for 24 h. Teeth were sectioned buccolingually. Digital photographs were made of sectioned surfaces using digital camera fitted on stereomicroscope. Microleakage was scored at occlusal and gingival margins using 0–3 scale. Dye penetration depth (DPD) at both margins was also measured using AnalySIS software. Data were analyzed using one-way ANOVA and Bonferroni multiple comparison test. Results. 5% of occlusal margins in Groups I and III had 50 average (DPD). In Group II, only 10% of occlusal margins showed dye penetration, with 60 average depth. For gingival margins, Groups I and III presented dye penetration in 55% of specimens, with 220 and 150 average (DPD), respectively. Group II had 60% of gingival margins, with 230 average (DPD). There was no significant difference in microleakage at occlusal and gingival margins in all groups. Dye penetration was larger at gingival than at occlusal margins (). Conclusion. None of placement techniques produced gap-free margins. Oblique and occlusogingival techniques exhibited higher degrees of microleakage at occlusal and gingival margins, as compared to that of split-increment technique. Splitting flat composite increment by diagonal cut, prior to light-curing, preserved bonded gingival margin integrity and reduced microleakage.
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Patel, Mahul. "Evolution of Indirect Restorations for Fixed Prosthodontics: Planning, Preparation and Cementation." Primary Dental Journal 8, no. 3 (September 2019): 48–63. http://dx.doi.org/10.1308/205016819827601554.
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The provision of indirect restorations utilising contemporary materials for single or multiple abutment units in primary health care is an essential requirement for all general dental practitioners to ensure predictable patient outcomes. This paper highlights the important considerations for comprehensive planning and adept treatment execution and delivery that can enhance the patient's dental experience and outcome. A selection of clinical cases highlighting established and novel restorative materials utilising conventional and adhesive clinical techniques is presented and discussed.
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Addy, Liam, Matthew Thomas, Carly Cummings, and Elizabeth King. "Removable Prosthodontics for the Management of Severe Toothwear." Dental Update 47, no. 5 (May 2, 2020): 396–404. http://dx.doi.org/10.12968/denu.2020.47.5.396.
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Toothwear is becoming increasingly more common for dentists to manage as the population is maintaining its teeth for longer. A large proportion of cases can be managed by means of adhesive dentistry in conjunction with preventive advice. There are, however, patients with severe toothwear alone, or toothwear in conjunction with missing teeth, which would be best served with a removable prosthodontic approach. This is particularly the case where dental implants are not indicated or appropriate. This article illustrates the use of removable prosthodontics for the management of toothwear and highlights the importance of these restorations in certain cases. It also considers the supportive programme required to ensure success of this treatment modality. CPD/Clinical Relevance: Toothwear is a prevalent dental problem that cannot always be addressed with an adhesive restorative or fixed prosthodontic approach, particularly when the toothwear is severe and or in combination with existing missing teeth.
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Ahmed, Doaa R. M., Diana G. Shaath, Jomana B. Alakeel, and Abdulaziz A. Samran. "Influence of Diode Laser for the Treatment of Dentin Hypersensitivity on Microleakage of Cervical Restorations." BioMed Research International 2021 (April 30, 2021): 1–11. http://dx.doi.org/10.1155/2021/9984499.
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Noncarious cervical lesions (NCCLs) are a common clinical finding often linked with dentin hypersensitivity (DH). Aim. The aim of the study was to evaluate the influence of diode laser for the treatment of DH on microleakage of subsequent NCCL restorations. Materials and Methods. Forty-eight extracted human premolars were collected. All teeth received standardized cervical preparation on both the buccal and palatal surfaces and were randomly divided into three groups ( n = 16 ) according to the restorative material used: nanohybrid composite resin (CR), resin-modified glass ionomer (RMGI), and conventional glass ionomer (GIC). The prepared cavities on the palatal surfaces were treated by diode laser using SIROlaser Blue (Sirona Dental Systems, Bensheim, Germany) prior to restoration, while preparations on the buccal surfaces were directly restored. After thermocycling, the teeth were immersed in methylene blue dye for microleakage evaluation under 40x magnification at both occlusal and cervical margins. The Kruskal-Wallis test followed by the Bonferroni tests was conducted to determine inter- and intragroup differences ( P < 0.05 ). Results. All restorative materials tested showed some degree of microleakage with no statistically significantly different scores with or without the use of laser desensitization prior to restorative treatment. Group CR showed the least microleakage, followed by group RMGI, while group GIC showed the highest. Cervical margins showed greater microleakage than the occlusal margins where the difference was statistically significant in the RMGI group without laser pretreatment ( P = 0.006 ) and in both groups CR ( P = 0.02 ) and RMGI ( P = 0.006 ) with the laser pretreatment. Conclusion. Application of diode laser for the treatment of DH prior to the restoration of teeth with NCCL did not affect the microleakage of all the restorative materials tested. All the materials showed some degree of microleakage, which was higher in gingival margins compared to occlusal margins. The resin composite shows the least microleakage among all the tested materials.
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Ciocan, Lucian Toma, Jana Ghitman, Vlad Gabriel Vasilescu, and Horia Iovu. "Mechanical Properties of Polymer-Based Blanks for Machined Dental Restorations." Materials 14, no. 23 (November 29, 2021): 7293. http://dx.doi.org/10.3390/ma14237293.
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The tremendous technological and dental material progress led to a progressive advancement of treatment technologies and materials in restorative dentistry and prosthodontics. In this approach, CAD/CAM restorations have proven to be valuable restorative dental materials in both provisional and definitive restoration, owing to multifarious design, improved and highly tunable mechanical, physical and morphological properties. Thus far, the dentistry market offers a wide range of CAD/CAM restorative dental materials with highly sophisticated design and proper characteristics for a particular clinical problem or multiple dentistry purposes. The main goal of this research study was to comparatively investigate the micro-mechanical properties of various CAD/CAM restorations, which are presented on the market and used in clinical dentistry. Among the investigated dental specimens, hybrid ceramic-based CAD/CAM presented the highest micro-mechanical properties, followed by CAD/CAM PMMA-graphene, while the lowest micro-mechanical features were registered for CAD/CAM multilayered PMMA.
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Sutton, Finlay, Zvi N. Ellituv, and Rachel Seed. "A Survey of Self-Perceived Educational Needs of General Dental Practitioners in the Merseyside Region." Primary Dental Care os12, no. 3 (July 2005): 78–82. http://dx.doi.org/10.1308/1355761054348468.
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Aim The aim of this study was to evaluate the self-perceived educational needs of a randomly selected group of general dental practitioners (GDPs) in the Merseyside region (UK). Materials and Methods Eighty-seven GDPs were randomly selected from 850 in the region and asked to complete a self-evaluation questionnaire regarding their self-perceived educational needs. Results Seventy-five (86%) responded, of which 52 (69.3%) were male and 23 (30.7%) female. There was no significant difference in self-perceived knowledge in any of the dental disciplines when gender and period of time since qualification were used as predictor variables. The majority of the GDPs felt they had a good knowledge of restorative dentistry and dental radiography. Some of the GDPs felt they had poor knowledge in implant dentistry, oral medicine, orthodontics, dental sedation techniques, oral surgery, endodontics, periodontics and dental radiography. None of the respondents felt they had poor knowledge in restorative dentistry, prosthodontics and paediatric dentistry. Seventy-four (98.7%) of the responding GDPs were motivated to attend continuing professional development (CPD) courses because of an interest in a particular dental discipline and only one reported attending out of personal learning needs. Implant dentistry was indicated by 30 (40.0%) of the respondents as their training programme of choice. Conclusions The respondents had high self-perceived knowledge of restorative dentistry, dental radiography, periodontics, endodontics, paediatric dentistry and prosthodontics. The respondents had low self-perceived knowledge of implant dentistry, orthodontics, oral medicine and dental sedation techniques. Of GDPs surveyed, 98.7% applied for courses they liked to attend, rather than needed to attend. Fifty-two per cent of male GDPs surveyed expressed a desire for training in implant dentistry.
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Frese, C., D. Wolff, and HJ Staehle. "Proximal Box Elevation With Resin Composite and the Dogma of Biological Width: Clinical R2-Technique and Critical Review." Operative Dentistry 39, no. 1 (January 1, 2014): 22–31. http://dx.doi.org/10.2341/13-052-t.
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SUMMARY Provided that moisture control is possible, today's resin composite materials can be applied successfully in the restorative treatment of extensively decayed teeth. This suggests that restorative margins will be increasingly located below the cementoenamel junction, probably invading biological width. The recently introduced technique of proximal box elevation (PBE) offers the possibility of performing a stepwise elevation of deep proximal cavities to create more favorable preparation margins for direct or indirect restorations. Clinical instructions for the restoration of extensively damaged teeth are given through this presentation. A two-step R2-technique will be shown, and a critical review of the dogma of biological width will be presented.
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Culshaw, Shauna. "Periodontal Disease: Its Impact on Restorative Dentistry." Primary Dental Journal 6, no. 1 (March 2017): 25–31. http://dx.doi.org/10.1177/205016841700600103.
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A healthy periodontium provides stable gingival margins and stable tooth position prior to tooth preparations for indirect restorations. Good periodontal health allows easier tissue handling during tooth preparation, impression taking and restoration fitting. Periodontal health is integral to successful restorative care. This report documents common clinical scenarios in which periodontal problems cause aesthetic concern.
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Vedhantam, Rangarajan, Yogesh Bhuvaneswar, Ganesh Kumar, Gajapathi Balaraman, Rahmath Shameem Shafiullah, and Maria Narmadha. "Role Of Digital Photography as a Tool for Shade Selection in Prosthodontics." JOURNAL OF CLINICAL PROSTHODONTICS AND IMPLANTOLOGY 2, no. 1 (June 30, 2020): 1–6. http://dx.doi.org/10.55995/j-cpi.2020001.
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Statement of problem: Shade selection remains as a challenge for any restorative dental procedures. There is a need to check for the reliability of methods used in shade selection for a successful restorative treatment. Aim: The aim of this study was to compare the reliability of two different methods used for shade selection, i.e.; visual method and digital photography method. Materials and methods: Fifty-two student participants of age group 18-25 years were selected for the study from our institution after obtaining informed consent. The only inclusion criteria for the study were the presence of an unrestored maxillary right central incisor. The shade of the right maxillary central incisor was determined by visual and digital photography method. In visual method, the shade was selected by the clinician using shade guide (vita classical shade guide) and the shade was manually entered. In digital photography method, the digital camera was used (eye special c iii dental camera). Standardized digital photographic images were taken and sent to a dental technician. The reliability of the perception of the clinician selected shade by visual method and the technician selected shade by digital method were compared and evaluated after being subjected to appropriate statistical analysis. Results: On comparison of the two different methods of shade selection, there was fair agreement between the two methods of shade selection. Conclusion: Digital camera can be used for shade selection as it improves communication between the dentist and dental technician and with further advancements in digitalisation, it may replace the visual method in the near future.
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Bukhari, Omair, Ayman Ahmed, Mohammed Kabany, and Ibtesam Afifi. "Treatment Need as an Indicator for Planning Dental Postgraduate Programs at Umm Al-Qura University, Saudi Arabia." Journal of Umm Al-Qura University for Medical Sciences 7, no. 1 (June 1, 2021): 1–5. http://dx.doi.org/10.54940/ms11920461.
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Background: The treatment need is one of the fundamental factors for effective planning of postgraduate dental programs that improve the competency of dental practitioners. Aims: To assess the treatment need of patients at Umm Al-Qura University, Dental Teaching Hospital utilizing statistically representative sample of patients visiting the clinics. To use data analyzed to propose the need and design for postgraduate degrees in the college. Material and methods: Information were retrieved from the electronic database of 4,967 patients’ files anonymously including age, gender, treatment needs and referred clinic specialty. The obtained data were subjected to descriptive statistics in the form of mean ± SD, frequencies, cross tabulations, and percentages using Statistical Package for the Social Sciences (SPSS) software. Results: The percentage of females' records was significantly higher (52%) than that of males. The mean age of males was higher than females (36.66 versus 35.10) while young adult age category constituted the greatest number (36.6%). The most common treatment need recorded in patients' files were periodontics (73.3%), restorative (60.4%) followed by fixed prosthodontics (54.8%). Nearly half of the patients’ (48.9%) were in need of endodontic treatment. The common significantly higher needs in females were restorative and periodontics, while among males, significantly higher treatment needs for surgery, endodontics and prosthodontics were recorded. Conclusion: Patient treatment needs at Faculty of Dentistry, Umm Al-Qura University reflect a high priority for proposing postgraduate degrees in periodontics and restorative dentistry. Also, devoting considerable time and effort in counseling and providing undergraduates with information that guide in making career decisions and match the treatment needs in Makkah, Saudi Arabia. Clinical Significance: Establishment of dental postgraduate degrees that meet the treatment needs of the community will lead to more professional diagnosis and management of patients by qualified specialists.
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Ahmed, Khaled E. "We're Going Digital: The Current State of CAD/CAM Dentistry in Prosthodontics." Primary Dental Journal 7, no. 2 (June 2018): 30–35. http://dx.doi.org/10.1177/205016841800700205.
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This paper reviews the current state of computer-aided design and manufacturing (CAD/CAM) in dentistry, with a special focus on restorative dental applications. The potential, advantages, and limitations of the technology will be discussed, comparing the digital workflow to conventional techniques, based on contemporary clinical evidence. The technology does seem to offer a more streamlined and efficient means of treatment planning and delivery of care through reduced chairside time, with reported improved patient satisfaction. Nonetheless, the accuracy and treatment outcomes of CAD/CAM treatment modalities are inconsistent and do not support a superior performance to existing conventional techniques, rather a comparable one.
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Hamad Alqahtani. "FACTORS TO BE CONSIDERED IN ORTHODONTIC INTERDISCIPLINARY APPROACH – A REVIEW." International Journal of Orthodontic Rehabilitation 13, no. 1 (March 31, 2022): 10–15. http://dx.doi.org/10.56501/intjorthodrehabil.v13i1.14.
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Orthodontic treatment can be part of a dental interdisciplinary treatment as a way to help other specialists in the team achieve efficient treatment results when dealing with complex cases. The team members must have basic and sufficient knowledge related to other disciplines if they are to have common ground for fruitful discussion of treatment options and possible solutions that will provide optimum esthetics and function, especially for adult patients. This article discusses important factors related to endodontics, periodontics, and restorative/prosthodontics and their interactions with orthodontics.
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Gardner, Lauren, Toby Gillgrass, and Mark Devlin. "The role of three-dimensional imaging in patients with cleft lip and palate." Faculty Dental Journal 4, no. 3 (July 2013): 118–23. http://dx.doi.org/10.1308/204268513x13703528618960.
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Three-dimensional (3D) imaging is revolutionising patient assessment, diagnosis, management and treatment planning. Restorative dentistry is using optical scanning such as the computer aided design/computer aided manufacture systems to help with tooth preparation design and construction of fixed prosthodontics. Other specialties in dentistry are frequently employing cone beam computed tomography (CBCT) to facilitate 3D imaging. This article outlines how CBCT and 3D sterophotogrammetry have been used in the management of cleft lip and palate with reference to the cleft team based at Glasgow Dental Hospital.
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Nair, K. Chandrasekharan, Vivek V. Nair, Harsha Kumar K, R. Ravichandran, Prasanth V, and Kavitha Janardanan. "Clinical relevance of Bennett\'s contribution – An overview." IP Annals of Prosthodontics and Restorative Dentistry 8, no. 4 (November 15, 2022): 195–98. http://dx.doi.org/10.18231/j.aprd.2022.040.
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Bennett movement has been extensively discussed in the literature, yet the clinical relevance of Bennett’s contribution in the field of Prosthodontics and restorative dentistry remains unclear. An electronic search of articles in PubMed database for relevant literature published between 1958 until present day was meticulously scrutinized with the following search terms: lateral movements or immediate mandibular lateral translation or mandibular side shift or Bennett side shift or Bennett movement. After conducting an extensive and in-depth review of the literature, the authors were unable to conclusively find the clinical relevance of Bennett movement. Moreover, the logical sequence could not be negated fully. For the beginners in the profession, it is desirable to incorporate this for intellectual and logical satisfaction until new research proves otherwise. The Bennett movement have little or no clinical impact in a restorative occlusal scheme.
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Gudapati, Swapnika. "Cavosurface margins for various restorations." IP Indian Journal of Conservative and Endodontics 7, no. 3 (October 15, 2022): 113–19. http://dx.doi.org/10.18231/j.ijce.2022.025.
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Many factors play a critical role in getting the best restoration, such as cavity design, operator skill, type of restorative material etc. However, the weakest link in any restoration is the tooth restoration interface. Every effort should be made to design and prepare these marginal peripheries to create the most favourable relationship with each other and for the longevity of the restoration. The restoration can survive in the biological environment of the oral cavity only if the margins are closely adapted to the cavosurface finish line of the preparation. One of the important aspects of cavity design is the cavosurface marginal seal/design. This review paper highlights the different cavosurface margins suitable for various restorations and their importance.
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Hokii, Y., R. Yoshimitsu, K. Yamamoto, S. Fukushima, F. Fusejima, and T. Kumagai. "Protection of enamel-glass ionomer restorative margins by resin-coatings." Dental Materials 30 (2014): e107. http://dx.doi.org/10.1016/j.dental.2014.08.220.
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Turkyilmaz, Ilser, Gregory Neil Wilkins, and Sarah Yun. "Moving from analogue to digital workflows in dentistry: Understanding undermilling and overmilling as detrimental factors in fabricating CAD/CAM crowns." Primary Dental Journal 11, no. 2 (June 2022): 59–61. http://dx.doi.org/10.1177/20501684221100938.
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Due to the limitations caused by the specific dimensions of milling burs, milling machines may inaccurately fabricate restorations by either over-reducing or under-reducing restorative material, respectively known as “overmilling” and “undermilling”. Overmilling occurs when the bur is unable to accommodate areas smaller than the size of the bur, especially at cusp tips and sharp line angles. This results in excess cement space and a weaker restoration. Undermilling occurs when small concavities are ignored by the larger milling bur, particularly at the margins. This results in inadequate seating of the restoration and open margins due to premature binding, which can lead to restorative failure. To prevent these processing errors, clinicians should ensure that all incisal edges and cusp tips are flattened and rounded, verify that there are no undercuts, and prepare teeth with 1mm thick, smooth finish lines. Furthermore, clinicians may use the preparation check and milling simulation step of computer-aided design/computer-aided manufacturing (CAD/CAM) software to confirm the preparation is adequate and the restorative design does not have potential areas that will lead to overmilling.
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Ebaya, Maha M., Ashraf I. Ali, and Salah H. Mahmoud. "Evaluation of Marginal Adaptation and Microleakage of Three Glass Ionomer-Based Class V Restorations: In Vitro Study." European Journal of Dentistry 13, no. 04 (October 2019): 599–606. http://dx.doi.org/10.1055/s-0039-3401435.
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Abstract Objective The aim of this study was to evaluate and compare the marginal adaptation and microleakage of class V cavities restored with conventional glass ionomer cement (GIC), resin-modified glass ionomer (RMGI), and bioactive ionic resin (BIR) restorative materials after 6 months of water storage. Materials and Methods One hundred twenty standardized class V cavities (2 mm deep, 4 mm in width, and 3 mm in height) were prepared in sound extracted human molar teeth, where the coronal margins were in enamel while the cervical margins were in dentin. Three glass ionomer-based restorations were tested (n = 40): GIC (Equia Fil), RMGI (Fuji II LC), and BIR (ACTIVA Bioactive Restorative). Half of the teeth from each group (n = 20) were evaluated for their marginal adaptation with scanning electron microscopy and the other half submitted to dye penetration test to examine microleakage. Further division for each subgroup (n = 10) occurred to be tested immediately, while the remaining teeth were examined after keeping for 6 months and thermocycling. Statistical analysis The outcomes were analyzed by Kruskal–Wallis and Mann–Whitney U tests. Results No statistically significant differences were observed among the three studied restorative materials. However, the differences were statistically significant in microleakage test between enamel and dentin and after water aging. Conclusion All tested restorative materials exhibited the same marginal adaptation and microleakage. Dentin substrate revealed greater microleakage than enamel, especially with BIR restorative material. Water aging had a negative effect on RMGI with respect to microleakage.
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Loomans, B., and T. Hilton. "Extended Resin Composite Restorations: Techniques and Procedures." Operative Dentistry 41, S7 (September 1, 2016): S58—S67. http://dx.doi.org/10.2341/15-212-lit.
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SUMMARY This article gives an overview of the state of the art of different restorative treatment procedures and techniques needed for placing extended posterior resin composite restorations. Clinical aspects related to the procedure are discussed and reviewed based on the current literature, such as the use of proper adhesive restorative materials, use of liners and bases, moisture control, reconstruction of proximal contacts, extended resin composite restorations, and techniques to address restoring teeth with deep subgingival margins.
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Shahidi, C., I. Krejci, and D. Dietschi. "In Vitro Evaluation of Marginal Adaptation of Direct Class II Composite Restorations Made of Different “Low-Shrinkage” Systems." Operative Dentistry 42, no. 3 (May 1, 2017): 273–83. http://dx.doi.org/10.2341/15-217-l.
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SUMMARY The present study evaluated the influence of various low-shrinkage restorative systems in class II direct composite restorations following simulated occlusal loading. Forty MOD class II cavities were prepared on freshly extracted human lower third molars with proximal margins located mesially 1.0 mm coronal to and distally 1 mm apical to the cementoenamel junction. The samples were randomly distributed into five experimental groups corresponding to the following restorative systems: a conventional resin composite (Tetric) as active control group, a low-shrinkage composite (Extra Low Shrinkage [ELS]) alone or combined with its corresponding flowable version (ELSflow) used as a 1- to 1.5-mm liner, a bulk-filling flowable composite (Surefil SDR) covered by a 1-mm layer of restorative composite (Ceram-X), and a restorative bulk-filling composite (SonicFill). All specimens were submitted to 1,000,000 cycles with a 100N eccentric load into saline. Tooth restoration margins were analyzed semiquantitatively by scanning electron microscopy before and after loading. The percentage of perfect adaptation to enamel varied from 94.15% (SonicFill) to 100% (ELS) before loading and from 69.22% (SonicFill) to 93.61% (ELS and ELSflow) after loading. Continuous adaptation to cervical dentin varied from 22.9% (Tetric) to 79.48% (SDR/Ceram-X) before loading and from 18.66% (Tetric) to 56.84% (SDR/Ceram-X) after loading. SDR/CeramX and SonicFill showed the best cervical dentin adaptation.
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George, Vinu T. "Management of Failed Long-span Single-piece Fixed Prosthesis with Metal—Ceramic Crowns and Cantilever Bridge with Predictable Esthetic Outcome." World Journal of Dentistry 7, no. 3 (2016): 162–66. http://dx.doi.org/10.5005/jp-journals-10015-1387.
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ABSTRACT Although there have been a lot of advances in the field of esthetic and cosmetic restorative dentistry, metal—ceramic restorations stand apart in the race to achieve superior esthetics with its strong points of strength and accuracy of cast metal and esthetics of porcelain. To achieve superior esthetic restorations operators are compelled to narrow down their search to all ceramic restorations which are highly expensive. At most times, its use is not rightly justified. A case of a 53-year-old female patient, who reported to the Department of Prosthodontics and Crown 8 Bridge, Manipal College of Dental Sciences, Manipal, is presented here where simple and economic restorative techniques and principles are undertaken to achieve predicable esthetic results. How to cite this article George VT. Management of Failed Long-span Single-piece Fixed Prosthesis with Metal—Ceramic Crowns and Cantilever Bridge with Predictable Esthetic Outcome. World J Dent 2016;7(3):162-166.
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Baran, G., K. Boberick, and J. McCool. "Fatigue of Restorative Materials." Critical Reviews in Oral Biology & Medicine 12, no. 4 (July 2001): 350–60. http://dx.doi.org/10.1177/10454411010120040501.
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Failure due to fatigue manifests itself in dental prostheses and restorations as wear, fractured margins, delaminated coatings, and bulk fracture. Mechanisms responsible for fatigue-induced failure depend on material ductility: Brittle materials are susceptible to catastrophic failure, while ductile materials utilize their plasticity to reduce stress concentrations at the crack tip. Because of the expense associated with the replacement of failed restorations, there is a strong desire on the part of basic scientists and clinicians to evaluate the resistance of materials to fatigue in laboratory tests. Test variables include fatigue-loading mode and test environment, such as soaking in water. The outcome variable is typically fracture strength, and these data typically fit the Weibull distribution. Analysis of fatigue data permits predictive inferences to be made concerning the survival of structures fabricated from restorative materials under specified loading conditions. Although many dental-restorative materials are routinely evaluated, only limited use has been made of fatigue data collected in vitro: Wear of materials and the survival of porcelain restorations has been modeled by both fracture mechanics and probabilistic approaches. A need still exists for a clinical failure database and for the development of valid test methods for the evaluation of composite materials.
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Pilatti Rastelli, Flávia, Ricardo de Sousa Vieira, and Márcio Souza Rastelli. "Posterior composite restorations in primary molars: an in vivo comparison of three restorative techniques." Journal of Clinical Pediatric Dentistry 25, no. 3 (April 1, 2001): 227–30. http://dx.doi.org/10.17796/jcpd.25.3.251848tg66583963.
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This in vivo study evaluated the clinical performance of class II restorations, in primary molars after 12 months. Three restorative techniques were used: filling the cavities in bulk; filling with three horizontal increments and placement in three horizontal increments using pre-polymerized composite inserts. The composite resin used was Prisma TP.H (Caulk-Dentsply) with the adhesive system ScotchbondMultipurpose (3M). Initially 90 class II restorations were placed in 27 patients from 8 to 10 years of age and followed-up for 12 months. After this period 55 restorations were evaluated for anatomic form, color alterations at the margins, presence of decay and marginal adaptation. The results showed that all groups presented similar rates of wear, the bulk insertion technique showed better results for marginal adaptation, color alterations of the margins and less presence of caries at occlusal margins, and that composite resin TP.H could be used in class II restorations in primary molars.
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Metz, M., M. Durski, J. Chou, G. Crim, B. Harris, and W.-S. Lin. "Microleakage of Lithium Disilicate Crown Margins Finished on Direct Restorative Materials." Operative Dentistry 41, no. 5 (September 1, 2016): 552–62. http://dx.doi.org/10.2341/15-225-l.
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SUMMARY Objective: For some esthetic clinical situations, it is necessary to finish crown margins on direct restorative materials to preserve tissue integrity, bonding integrity, and biological width. The purpose of this research was to investigate microleakage at the interface between bonded lithium disilicate crowns and various direct restorative materials in a class III and class V position. Methods and Materials: Class III or class V restorations were prepared on one side of extracted incisors with either Tetric EvoCeram, Tetric Evoceram Bulk, Fuji II LC, or Tetric Evoflow. The teeth were prepared for and received a lithium disilicate crown. After load fatiguing, the specimens were thermo-cycled with a fuchsin dye and sectioned. The depth and area of dye penetration were measured with a dimensional grid in micrometers using stereomicroscopy and reported as mean dye depth and area (μm) ± SD. The comparison of multiple categorical independent variables with ratio scale dependent variables was evaluated with an analysis of variance and Tukey's post hoc analysis. Results: A statistically significant higher dye penetration was noted for all treatment groups compared with the positive control (side opposite the restoration after sagittal sectioning was used as positive control) regardless of material or placement area (p<0.05). In comparing treatment groups, the Tetric EvoFlow experienced a statistically higher dye penetration than did the other treatment groups regardless of material or placement area (p<0.05). There was no statistically significant difference between the Tetric EvoCeram, Tetric Evoceram Bulk, and Fuji II LC materials regardless of placement area (p>0.05). Conclusions: Within the limitations of this study, it can be concluded that flowable composite materials as finish lines that interact with resin cements could lead to exacerbated interfacial degradation. Finishing lithium disilicate all-ceramic crowns on flowable resin composite materials in the esthetic zone should be used with caution. If necessary, finishing lithium disilicate all-ceramic crowns on nanofilled resin composite or resin-modified glass ionomer materials seems to provide the least dye penetration depth and area.
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CASTRO, ANA KARINA BARBIERI BEDRAN, LUIZ ANDRÉ FREIRE PIMENTA, CRISTIANE MARIOTE AMARAL, and GLÁUCIA MARIA BONI AMBROSANO. "Evaluation of Microleakage in Cervical Margins of Various Posterior Restorative Systems." Journal of Esthetic and Restorative Dentistry 14, no. 2 (March 2002): 107–14. http://dx.doi.org/10.1111/j.1708-8240.2002.tb00159.x.
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Abdulrahman, Nuha Abdulazeem Mohammed, Nadia Khalifa, and Mohammed Nasser Alhajj. "Dentists’ Preferences in the Treatment of Congenitally Missing Maxillary Lateral Incisors." Brazilian Dental Science 22, no. 2 (April 30, 2019): 243–51. http://dx.doi.org/10.14295/bds.2019.v22i2.1710.
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Objective: Congenitally missing maxillary lateral incisors present challenges to dentists in terms of treatment planning and can negatively affect aesthetics and function in patients. The aim of the present study was to determine the preferred treatment approach of dentists with different specialties. Material and Methods: We carried out a descriptive, cross-sectional study using a questionnaire that was self-administered to 12 specialists in removable prosthodontics, 18 specialists in restorative dentistry, 14 specialists in orthodontics, and 173 registered general dentists. Results: General practitioners (72.7%), prosthodontists (92.9%) and, restorative dentists (80%) preferred prosthodontic replacement of missing maxillary lateral incisors, while orthodontists (57.1%) preferred canine substitution. Most general practitioners (62.7%), prosthodontists (71.4%), and orthodontists (92.9%), as well as many restorative specialists (40%), preferred implant-retained crowns for prosthetic replacement of missing lateral incisors. The dental specialties differed significantly in terms of their preferred modalities for treating children over the age of 12 years. General practitioners (56%) preferred removable partial dentures (RPDs), while a mere 17.2% preferred to carry out no treatment. All prosthodontists (100%) preferred treatment with RPDs. Restorative dentists preferred RPDs and adhesive bridges in equal number (33.3% in each case). Fifty percent of orthodontists treating children with missing lateral incisors preferred RPDs, followed by (28.6%) who preferred canine substitution. Conclusion: Preference varied for several reasons among dentists’ treating both adults and children over 12 years of age. KeywordsMaxillary missing teeth; Dentist's preference; Teeth replacement; Dental implant.
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Aulfat A. Albahari, Ahmed A. Madfa, and Mohammed A. Dubais. "Invitro Effect of Bulkfill and Incremental Application Techniques with Different Composite Filling Materials on Marginal Microleakage." Yemeni Journal for Medical Sciences 14, no. 1 (August 11, 2021): 28–35. http://dx.doi.org/10.20428/yjms.v14i1.1805.
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Abstract
Objective: To assess the in vitro effect of bulkfill and incremental application techniques on the microleakage of class II dental cavities filled with three different bulkfill composite materials at occlusal and cervical margins.
Methods: Standardized class II cavities were prepared on 120 human premolar teeth extracted for orthodontic treatment, which were randomly divided into two main groups of 60 teeth, corresponding to the two application techniques. Each group wasthen sub-dividedrandomly into three sub-groups based on the type of bulkfill restorative materials as follows: Tetric®N-Ceram BulkFill, Filtek™BulkFill flowable restorative material and X-trafil®BulkFill. All cavities were prepared and etched, and the corresponding self-etch bond adhesive systems were applied. A stereomicroscope was used to assess microleakage after thermocycling and immersion of the specimens in 0.1% methylene blue for 24 hours. Mann-Whitney U test was then used to analyze data.
Results: No statistically significant difference was found in the marginal microleakage between the incremental and bulkfill techniques using the three types of composite materials at both occlusal and cervical margins. The X-trafil®BulkFill showed the lowest score of microleakage with both application techniques compared to other bulkfill composite materials.
Conclusion: Both incremental and bulkfill application techniques using Tetric®N-Ceram BulkFill, Filtek™BulkFill flowable restorative material and X-trafil®BulkFill composite materials have a comparable effect on the marginal microleakage at occlusal and cervical margins of human teeth extracted from dental clinics in Sana’a city. Further studies are recommended to assess the clinical success of bulkfill composite materials using SEM or confocal microscope.
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Aulfat A. Albahari, Ahmed A. Madfa, and Mohammed A. Dubais. "Invitro Effect of Bulkfill and Incremental Application Techniques with Different Composite Filling Materials on Marginal Microleakage." Yemeni Journal for Medical Sciences 14, no. 1 (August 11, 2021): 28–35. http://dx.doi.org/10.20428/yjms.14.1.a5.
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Abstract
Objective: To assess the in vitro effect of bulkfill and incremental application techniques on the microleakage of class II dental cavities filled with three different bulkfill composite materials at occlusal and cervical margins.
Methods: Standardized class II cavities were prepared on 120 human premolar teeth extracted for orthodontic treatment, which were randomly divided into two main groups of 60 teeth, corresponding to the two application techniques. Each group wasthen sub-dividedrandomly into three sub-groups based on the type of bulkfill restorative materials as follows: Tetric®N-Ceram BulkFill, Filtek™BulkFill flowable restorative material and X-trafil®BulkFill. All cavities were prepared and etched, and the corresponding self-etch bond adhesive systems were applied. A stereomicroscope was used to assess microleakage after thermocycling and immersion of the specimens in 0.1% methylene blue for 24 hours. Mann-Whitney U test was then used to analyze data.
Results: No statistically significant difference was found in the marginal microleakage between the incremental and bulkfill techniques using the three types of composite materials at both occlusal and cervical margins. The X-trafil®BulkFill showed the lowest score of microleakage with both application techniques compared to other bulkfill composite materials.
Conclusion: Both incremental and bulkfill application techniques using Tetric®N-Ceram BulkFill, Filtek™BulkFill flowable restorative material and X-trafil®BulkFill composite materials have a comparable effect on the marginal microleakage at occlusal and cervical margins of human teeth extracted from dental clinics in Sana’a city. Further studies are recommended to assess the clinical success of bulkfill composite materials using SEM or confocal microscope.
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Safarov, Murod Toshpulatovich, Jaloladdin Xalimetov, and Sardor Tolmasov. "SOME ASPECTS OF RETRACTION THE GINGIVAL SULCUS." UZBEK MEDICAL JOURNAL Special issue, no. 3 (September 30, 2021): 39–44. http://dx.doi.org/10.26739/2181-0664-2021-si-3-8.
Full textAbstract:
In order to achieve an optimal fit between the crown and the margin formed below the gingival margin, a good mapping of the space behind the margin is required. This can be accomplished in a variety of ways. At various stages, general dentists and prosthodontists apply gum retraction across the board on a daily basis. Gum retraction was first described in 1941 by Thompson. Today, a large assortment of retraction cords is presented on the material market. One of the main requirements forhigh-precision impressions is a clear display of the gingival sulcus around the abutment teeth. To obtain high-quality impressions, it is necessary to ensure the unimpeded position of the impression material in this area, which is ensured by retraction. With the generalized form of increased abrasion of the hard tissues of the teeth, all teeth or most of them are subject to restoration of the anatomical shape, therefore it is important to choose a retraction method that would not only allow obtaining ahigh-quality impression, but also minimize its negative effect. Since 1975, PubMed and Google Scholar have searched for studies on gingival tissue management prior to impression creation on fixed dentures. The conclusions were extracted and summarized by us. Gingival retraction methods are divided intomechanical, chemical or surgical types. This article discusses the various methods of gingival retraction for subsequent double-layer impressions.
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Safarov, Murod Toshpulatovich, Jaloladdin Xalimetov, and Sardor Tolmasov. "SOME ASPECTS OF RETRACTION THE GINGIVAL SULCUS." UZBEK MEDICAL JOURNAL Special issue, no. 3 (September 30, 2021): 39–44. http://dx.doi.org/10.26739/2181-0664-2021-si-3-8.
Full textAbstract:
In order to achieve an optimal fit between the crown and the margin formed below the gingival margin, a good mapping of the space behind the margin is required. This can be accomplished in a variety of ways. At various stages, general dentists and prosthodontists apply gum retraction across the board on a daily basis. Gum retraction was first described in 1941 by Thompson. Today, a large assortment of retraction cords is presented on the material market. One of the main requirements forhigh-precision impressions is a clear display of the gingival sulcus around the abutment teeth. To obtain high-quality impressions, it is necessary to ensure the unimpeded position of the impression material in this area, which is ensured by retraction. With the generalized form of increased abrasion of the hard tissues of the teeth, all teeth or most of them are subject to restoration of the anatomical shape, therefore it is important to choose a retraction method that would not only allow obtaining ahigh-quality impression, but also minimize its negative effect. Since 1975, PubMed and Google Scholar have searched for studies on gingival tissue management prior to impression creation on fixed dentures. The conclusions were extracted and summarized by us. Gingival retraction methods are divided intomechanical, chemical or surgical types. This article discusses the various methods of gingival retraction for subsequent double-layer impressions.
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Kameyama, Atsushi, Aoi Saito, Akiko Haruyama, Tomoaki Komada, Setsuko Sugiyama, Toshiyuki Takahashi, and Takashi Muramatsu. "Marginal Leakage of Endodontic Temporary Restorative Materials around Access Cavities Prepared with Pre-Endodontic Composite Build-Up: An In Vitro Study." Materials 13, no. 7 (April 5, 2020): 1700. http://dx.doi.org/10.3390/ma13071700.
Full textAbstract:
This study aimed to examine the marginal seal between various commercial temporary restorative materials and exposed dentin/built-up composite. Sixty bovine incisors were cut above the cemento-enamel junction, and half of the dentin was removed to form a step, which was built up using flowable resin composite. The root canals were irrigated, filled with calcium hydroxide, and sealed using one of six temporary sealing materials (hydraulic temporary restorative material, temporary stopping material, zinc oxide eugenol cement, glass-ionomer cement, auto-cured resin-based temporary restorative material, and light-cured resin-based temporary restorative material) (n = 10 for each material). The samples were thermocycled 500 times and immersed in an aqueous solution of methylene blue. After 2 days, they were cut along the long axis of the tooth and the depth of dye penetration was measured at the dentin side and the built-up composite side. For the margins of the pre-endodontic resin composite build-up, the two resin-based temporary restorative materials showed excellent sealing. Hydraulic temporary restorative material had a moderate sealing effect, but the sealing effect of both zinc oxide eugenol cement and glass-ionomer cement was poorer.
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Sampaio, CS, RV Rodrigues, EJ Souza-Junior, AZ Freitas, GMB Ambrosano, FM Pascon, and RM Puppin-Rontani. "Effect of Restorative System and Thermal Cycling on the Tooth-Restoration Interface – OCT Evaluation." Operative Dentistry 41, no. 2 (March 1, 2016): 162–70. http://dx.doi.org/10.2341/14-344-l.
Full textAbstract:
SUMMARY The present study evaluated the tooth/noncarious cervical lesion restoration interface when using different adhesive systems and resin composites, submitted to thermal cycling (TC), using optical coherence tomography (OCT). Noncarious cervical lesion (NCCL) preparations (0.7 mm depth × 2 mm diameter) were performed on 60 human third molars and randomly divided into six groups, according to the adhesive system and resin composite used: group 1 = Adper Single Bond 2 (SB2) + Aelite LS Posterior (AP); group 2 = SB2 + Venus Diamond (VD); group = SB2 + Filtek Z250XT (Z250); group 4 = Clearfil SE Bond (CSE) + AP; group 5 = CSE + VD; group 6 = CSE + Z250. Selective enamel etching was performed for 30 seconds on groups 4, 5, and 6, while groups 1, 2, and 3 were etched for 30 seconds in enamel and 15 seconds in dentin. All groups were evaluated using OCT before and after TC (n=10). Images were analyzed using Image J software; enamel and dentin margins were separately evaluated. Data from OCT were submitted to PROC MIXED for repeated measurements and Tukey Kramer test (α = 0.05). No marginal gaps were observed in etched enamel, either before or after TC, for all adhesive and resin composite systems. A significant interaction was found between adhesive system and TC for the dentin groups; after TC, restorations with CSE showed smaller gaps at the dentin/restoration interface compared with SB2 for all resin composites. Increased gap percentages were noticed after TC compared with the gaps before TC for all groups. In conclusion, TC affected marginal integrity only in dentin margins, whereas etched enamel margins remained stable even after TC. Dentin margins restored with CSE adhesive system showed better marginal adaptation than those restored with SB2. Resin composites did not influence marginal integrity of NCCL restorations.