Journal articles on the topic 'Trompetenmuseum (Bad Säckingen, Germany)'
To see the other types of publications on this topic, follow the link: Trompetenmuseum (Bad Säckingen, Germany).
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 29 journal articles for your research on the topic 'Trompetenmuseum (Bad Säckingen, Germany).'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Justino, Geisiele Aparecida Biscaia, Ingrid Carletto Dalmolin, Naiana Mello Cançado, Anna Luiza Szesz, and Eveline Claudia Martini. "Clinical Evaluation of the Effectiveness of Whitening Dentifrices." Journal of Health Sciences 21, no. 1 (March 30, 2019): 82. http://dx.doi.org/10.17921/2447-8938.2019v21n1p82-7.
Full textAbstract:
O objetivo deste estudo clínico foi avaliar, por 7 semanas, a eficácia de dentifrícios clareadores e a satisfação dos pacientes após o uso. Foram selecionados 30 pacientes que possuíssem todos os dentes anteriores nas arcadas superior e inferior, apresentando cor inicial A2, avaliados através da escala de cores Vita Classical (Vita Zahnfabrik, Bad Säckingen, Alemanha). Os participantes foram aleatoriamente divididos em 3 grupos (n=10): GA - Colgate® Máxima Proteção Anticáries (controle negativo), GB - Colgate® Luminous White e GC - Colgate® Luminous White Advanced. Os dentifrícios foram distribuídos em bisnagas idênticas e aleatorizados. As avaliações de cor foram realizadas inicialmente ao uso (baseline), após 7, 15, 30 e 60 dias, utilizando dois métodos: avaliação subjetiva com as escalas de cor Vita Classical (Vita Zahnfabrik, Bad Säckingen, Alemanha) e Vita Bleachedguide 3D-MASTER (Vita Zahnfabrik, Bad Säckingen, Alemanha), e avaliação objetiva através do espectrofotômetro VITA Easyshade Compact®, Vident, Brea, CA, USA). Foi considerada a satisfação do paciente quanto a mudança de cor dos dentes. Os dados foram submetidos à análise estatística, utilizando análise de variância (ANOVA) de três critérios e pós-teste de Tukey (α=0.05). Os resultados demonstraram que houve diferença de cor estatisticamente significante nos grupos em que se utilizou os dentifrícios clareadores (GB e GC), nos períodos entre 15 e 30 dias. Conclui-se que ambos os dentifrícios GB e GC apresentaram ação clareadora, observado através das escalas subjetiva e objetiva. Porém, na percepção do paciente apenas no grupo GC houve mudança de cor.Palavras-chave: Dentifrícios. Clareamento Dental. Estética Dentária.AbstractThe objective of this clinical study was to evaluate, for 7 weeks, the efficacy of whitening dentifrices and the patients' satisfaction after use. 30 patients were selected who had all the anterior teeth in the upper and lower arches, presenting an initial color A2, evaluated through the Vita Classical color scale (Vita Zahnfabrik, Bad Säckingen, Germany). The participants were randomly divided into 3 groups (n = 10): GA - Colgate® Maximum Antibody Protection (Negative Control), GB - Colgate® Luminous White and GC - Colgate® Luminous White Advanced. The dentifrices were distributed in identical and randomized tubes. The color evaluations were performed at baseline after 7, 15, 30 and 60 days using two methods: subjective evaluation with the Vita Classical (Vita Zahnfabrik, Bad Säckingen, Germany) and Vita Bleachedguide 3D- MASTER (Vita Zahnfabrik, Bad Säckingen, Germany), and objective evaluation using VITA Easyshade Compact® spectrophotometer, Vident, Brea, CA, USA). The patient's satisfaction with the teeth color change was considered. The data were submitted to statistical analysis using ANOVA of three criteria and Tukey post-test (α = 0.05). The results showed that there was a statistically significant difference in color in the groups in which the whitening dentifrices were used (GB and GC), in periods between 15 and 30 days. It was concluded that both GB and CG dentifrices presented a whitening action, observed through the subjective and objective scales. However, in the perception of the patient only in the CG group there was a change of color.Keywords: Dentifrices. Tooth Bleaching. Esthetics, Dental.
2
Barath, V. S., F. J. Faber, S. Westland, and W. Niedermeier. "Spectrophotometric Analysis of All-ceramic Materials and Their Interaction with Luting Agents and Different Backgrounds." Advances in Dental Research 17, no. 1 (December 2003): 55–60. http://dx.doi.org/10.1177/154407370301700113.
Full textAbstract:
In this study, two All-Ceramic (AC) materials—Empress 2 (EMP) (Ivoclar Vivadent AG, Schaan, Liechtenstein) and In-Ceram ALUMINA (ICA) (Vita Zahnfabrik, Bad Säckingen, Germany)—were analyzed, along with the effects of 3 luting agents— viz. Zinc Phosphate cement (ZNPO, PhospaCEM PL, Ivoclar Vivadent AG, Schaan, Liechtenstein), Glass Ionomer Cement (GIC, Ketac-Cem Radiopaque, ESPE Dental AG, Seefeld, Germany), and Compolute (COMP, ESPE Dental AG, Seefeld, Germany)—on the final color, using the CIELab system. Color differences (DeltaL, Deltaa, Deltab, and DeltaE) were calculated for samples with luting agents and for samples without luting agents with standard white and black backgrounds, with the use of a spectrophotometer, Luci 100 (Dr. Lange, Berlin, Germany). One-way ANOVA for DeltaL, Deltaa, Deltab, and DeltaE within both the AC systems, with and without luting agents, showed significant contributions of the background (p < 0.05). EMP was seen to be more translucent than ICA. Darker ceramics showed less color variation. Luting agents altered the final color of the restoration. ZNPO was least translucent, followed by GIC and COMP. Marginal increases in thicknesses of ICA samples (0.4 mm) do not show a statistically significant color difference. No method exists to predict the outcome of an AC restoration based on consideration of the luting agent and the background color.
3
Balladares, Andrea Ordoñez, Cristian Abad-Coronel, Joao Carlos Ramos, Jorge I. Fajardo, Cesar A. Paltán, and Benjamín José Martín Biedma. "Comparative Study of the Influence of Heat Treatment on Fracture Resistance of Different Ceramic Materials Used for CAD/CAM Systems." Materials 17, no. 6 (March 8, 2024): 1246. http://dx.doi.org/10.3390/ma17061246.
Full textAbstract:
The aim of this study was to compare the influence of heat treatment on fracture resistance (FR) of different ceramic materials used for CAD/CAM systems. Methods: Eighty monolithic restorations were designed using the same parameters and milled with a CAD/CAM system (CEREC SW 5.0, PrimeMill, Dentsply-Sirona™, Bensheim, Germany), forming five study groups: Group 1 (n = 10), CEREC Tessera (Dentsply-Sirona™, Bensheim, Germany) crystallized (CCT), Group 2 (n = 10), CEREC Tessera uncrystallized (UCT), Group 3 (n = 20), Emax-CAD (Ivoclar Vivadent, Schaan, Liechtenstein) (CEC), Group 4 (n = 20), Vita Suprinity (Vita Zahnfabrik, Bad Säckingen, Germany) (CVS), and Group 5 (n = 20) Cameo (Aidite, Qinhuangdao, China) (CC). Results: The average FR was similar for CCT, CC, and CEC at above 400 N, while CVS and UCT had the lowest values at 389,677 N and 343,212 N, respectively. Conclusion: Among the three ceramic materials that exhibited an FR above 400 N, CCT was considered the first recommended choice for CAD/CAM systems. This material not only demonstrated the highest FR but also exhibited outstanding consistency in the related measurements without the presence of outliers. Although the CC material showed high FR, its high dispersion revealed inconsistencies in the repetitions, suggesting caution in its use.
4
Alvarado-Lorenzo, Alfonso, Laura Criado-Pérez, Mónica Cano-Rosás, Eva Lozano-García, Juan López-Palafox, and Mario Alvarado-Lorenzo. "Clinical Comparative Study of Shade Measurement Using Two Methods: Dental Guides and Spectrophotometry." Biomedicines 12, no. 4 (April 9, 2024): 825. http://dx.doi.org/10.3390/biomedicines12040825.
Full textAbstract:
Tooth color is a determining factor in the fabrication of dental prostheses. The aim of the present study is to compare two measurement methods used in the field of dentistry: dental guides and spectrophotometry. A total of 2768 natural teeth were measured using the Vita Classical and Vita 3D-Master dental guides (Vita-Zahnfabrik, Bad Säckingen, Germany), as well as a Vita Easyshade Compact spectrophotometer (Vita-Zahnfabrik). The measurements were carried out by one operator under suitable illumination conditions at 5500 degrees Kelvin. The obtained results show that the measurements obtained with the Vita Classical dental guide classifies teeth into the A-B categories, while the spectrophotometer preferentially classifies teeth into the B-C categories. The correlation coefficients obtained with the dental guides ranged from −0.32 to −0.39 (p < 0.01), while those for the spectrophotometer ranged from −0.35 to −0.55 (p < 0.01). Therefore, we can conclude that the spectrophotometer is more reliable and reproducible in its measurements than the dental guides.
5
Prause, Elisabeth, Wolfgang B. Hannak, Robert Nicic, Holger A. Jakstat, Klaus Böning, and Thomas Klinke. "Visual Versus Digital Color Determination of 3D-Printed Teeth as an Exercise in Dental Students’ Education." Dentistry Journal 12, no. 2 (January 26, 2024): 24. http://dx.doi.org/10.3390/dj12020024.
Full textAbstract:
Visual color determination is part of the daily routine in dental practice. However, it is not a part of dental education so far. The aim of this study was to evaluate whether visual or digital tooth color determination of 3D-printed teeth is a reliable tool for inexperienced dentistry students. Preclinical dental students evaluated eleven 3D-printed, tooth-shaped samples (VarseoSmile Crown plus, BEGO, Bremen, Germany) of different color shades. Visual shade determination using a reference scale (3D-Master Toothguide (3DM_TG), VITA Zahnfabrik, Bad Säckingen, Germany), followed by a digital color determination using a spectrophotometer (VITA Easyshade V, (ES_V), VITA Zahnfabrik), was performed. Color deviation was calculated in the Lab* color space (ΔE00) and converted into CIELAB 2000. The results were evaluated using the Mann–Whitney U test and the Wilcoxon Rank Sum test (α = 0.05). Significant differences between visual and digital color determination were proven (p < 0.001). Visual color determination (3DM_TG) showed a mean deviation (ΔE00 ± 95%CI) of 6.49 ± 0.47. Digital color determination (ES_V) showed significantly lower mean deviations of ΔE00 of 1.44 ± 0.58. Digital tooth color measurement using a spectrophotometer was a more reliable tool for the color determination of 3D-printed teeth for inexperienced dentistry students.
6
Rauch, Angelika, Sebastian Mehlhorn, Manja Mühle, and Dirk Ziebolz. "A Glass Fiber-Reinforced Resin Composite Splint to Stabilize and Replace Teeth in a Periodontally Compromised Patient." Case Reports in Dentistry 2020 (July 22, 2020): 1–7. http://dx.doi.org/10.1155/2020/8886418.
Full textAbstract:
Combined periodontal and prosthodontic treatment demands of patients require a structured coordination of pretreatments and an adequate choice of restorations. This is especially true if multiple teeth are missing and insufficient crown-root ratios are obvious. A 40-year-old patient with a severe periodontitis (Stage IV, Grade C) was treated with active, nonsurgical periodontal therapy. Afterwards, a supportive periodontal therapy was provided with a recall interval of three to four months. Due to a high tooth mobility of the anterior teeth in the upper jaw and a missing left canine, a combination of a resin composite (Signum composite, Kulzer, Hanau, Germany) and a unidirectional glass prepreg fiber (Tender Fiber Quattro, MICERIUM, Avegno, Italy) was utilized to fabricate a splint in a labside approach to stabilize the remaining teeth. Moreover, an artificial denture tooth was adhesively luted to the splint. A temporary polymer-based material (Vita CAD-Temp, VITA Zahnfabrik, Bad Säckingen, Germany) was selected to supply the posterior teeth of the patient with a 3-unit fixed dental prosthesis (FDP), and both restorations were adhesively cemented. 19 months after insertion, a fracture of the fiber-reinforced resin composite splint occurred that was intraorally repaired. In spite of the fracture of the splint, all materials were functionally and esthetically stable over the follow-up period of 22 months.
7
Lopes-Rocha, Lígia, José Manuel Mendes, Joana Garcez, Ana Góis Sá, Teresa Pinho, Júlio C. M. Souza, and Orlanda Torres. "The Effect of Different Dietary and Therapeutic Solutions on the Color Stability of Resin-Matrix Composites Used in Dentistry: An In Vitro Study." Materials 14, no. 21 (October 21, 2021): 6267. http://dx.doi.org/10.3390/ma14216267.
Full textAbstract:
The purpose of this study was to evaluate the color stability of aesthetic restorative resin-matrix materials after their immersion in different dietary and therapeutic solutions. Thirty disc-shaped specimens (10 × 2 mm) were prepared from three different types of resin-matrix composites used in dentistry (BE, FS, AF). The color coordinates (L*a*b*, ΔL*, Δa*, Δa*, Δb* and ΔE*) were measured using a VITA Easyshade 3D-Master (VITA Zahnfabrik, Bad Säckingen, Germany) before and after the immersion of the specimens in coffee, red wine, Coca-Cola®, Eludril Care®, and distilled water solutions for 40 h. The color change (ΔE*) was calculated and analyzed by the Kolmogorov -Smirnov test and the Kruskal -Wallis multiple-comparison test. All the restorative materials showed significant color (ΔE*) changes after their exposure to red wine, followed by coffee and Coca-Cola®; however, one nanohybrid resin-matrix composite showed a high color stability in such colored test solutions. The chemical composition and content of the organic matrix played a key role in the color stability of the resin-matrix composites. Clinicians should advise their patients about the chemical interaction between dietary substances and different resin-matrix composites.
8
Trigo-Humaran, María, Alan Agüero-Romero, Marcela Lespade, Juan García- Cuerva, and María Iglesias. "Tooth color in dental students from Buenos Aires University, Dental School, Argentina." Acta Odontológica Latinoamericana 35, no. 2 (September 29, 2022): 98–104. http://dx.doi.org/10.54589/aol.35/2/98.
Full textAbstract:
The aim of this study was to evaluate tooth color in dental students at the University of Buenos Aires, Argentina. The participants were 184 students (157 women and 27 men) aged 21 to 33 years, mean age 24.45 (SD 2.79) years, who were in the fourth year of their dental degree. They agreed to participate through an informed consent. Exclusion criteria were: having undergone a bleaching treatment within the previous six months, presence of total or partial peripheral restoration, pigmentations, fracture, carious and non-carious lesions or absence of the right upper central incisor (1.1). A dental prophylaxis procedure was performed on the buccal surface of each 1.1 tooth with a prophylaxis brush (TDV) mounted on a low-speed rotary instrument Kavo 2068 CHC (Germany) micromotor and a Kavo LUX K201(Germany) contra-angle. Shade was measured in the middle third of each 1.1 tooth, by the same observer, using a VITA Easyshade V spectrophotometer (Zahnfabrikn Bad Säckingen, Germany), which was calibrated before each determination according to manufacturer’s instructions, in the same dental unit (Sino S2316), with natural illumination, in the same time slot, without using the dental unit lamp. The results were recorded in an ad-hoc form and rates and confidence interval were obtained. Shade prevalence percentages (95% CI) were: A1: 46.2 (38.83 - 53.68); followed by A2 and B2, both with 17.39 (12.21 - 23.66); A3: 6.52 (3.41-11.11); B1: 4.35 (1.9-8.39); D2: 2.72 (0.89 - 6.23); B3: 2.17 (0.60-5.47) and C2: 1.09 (0.13-3.87); D3, C3, A3.5 and A4: 0.54 (0.01-2.99). Shades D1 and C1 were not determined in any subject. Within the conditions of this study, A1 was the most prevalent shade in central incisors, followed by A2 and B2.
9
Espíndola-Castro, LF, A. Rosenblatt, A. Galembeck, and GQM Monteiro. "Dentin Staining Caused by Nano-silver Fluoride: A Comparative Study." Operative Dentistry 45, no. 4 (February 13, 2019): 435–41. http://dx.doi.org/10.2341/19-109-l.
Full textAbstract:
Clinical Relevance The new formulations of nano-silver fluoride caused less dentin staining than the already available commercial agents 35% silver fluoride and silver diamine fluoride at 30% and 38%. SUMMARY The objective of this study was to evaluate the dentin staining potential of nano-silver fluoride (NSF 600 and 1500 ppm) compared with the following commercially available cariostatic agents: Advantage Arrest (Elevate Oral Care, West Palm Beach, FL, USA), Riva Star (SDI, Victoria, Australia), and Cariestop (Biodinâmica, Paraná, Brazil). Seventy-five extracted human molars were sectioned at the cementoenamel junction, and the occlusal enamel was removed for exposure of coronary dentin. The samples were divided among the five agents tested (n=15). The dentin staining (ΔE/ΔL) was analyzed with a digital spectrophotometer (VITA Easyshade, VITA Zahnfabrik, Bad Säckingen, Germany) at three different time points (before application, after two weeks, and after four weeks). Photographic images were also performed. The Kruskal-Wallis and Mann-Whitney tests compared the mean ΔE and ΔL values between groups. The NSF 600 and 1500 ppm resulted in the smallest color change (ΔE=1.02 and 1.53) and dentin staining after four weeks (ΔL=−0.76 and −1.2). The new formulations differed significantly from the commercial cariostatic agents (p<0.001). NSF might be an alternative to silver diamine fluoride since it does not compromise esthetics.
10
Hernández, Alejandra Díaz, Ana María Martín Casado, Miguel Gómez-Polo, Alicia Celemín Viñuela, and Cristina Gómez-Polo. "Degree of Standardisation in Ceramic Gingival Systems." Materials 16, no. 20 (October 16, 2023): 6710. http://dx.doi.org/10.3390/ma16206710.
Full textAbstract:
No gingival shade guide exists that can be used as a ‘gold standard’ in gingival shade selection. This research, therefore, aimed to determine whether comparable results in subjective gingival shade selection can be achieved using basic gingival colours produced by distinct manufacturers. It also aimed to explore how coverage of the colour space is affected by mixing these basic colours to create additional shades. To achieve these objectives, the basic gingival colours of three ceramic systems (Heraceram, Kulzer, Madrid, Spain; Vita VM9, Vita Zahnfabrik, Bad Säckingen, Germany; IPS Style, Ivoclar, Schaan, Liechtenstein) were analysed. The colour systems were expanded by creating porcelain gingival samples, whose colours were obtained by mixing the basic colours, altering each mixture by increments of 10%, and respecting the numerical order used by manufacturers to identify the colours. The colour coordinates of the basic and additional colours were recorded using spectrophotometry, and the intra- and inter-system colour differences were calculated using the Euclidean (ΔEab) and CIEDE2000 (ΔE00) formulae. None of the basic colours in the three systems, despite their similar nomenclature, were found to be interchangeable (the colour differences exceeded the gingival acceptability threshold: ΔE00 2.9 units). The expanded gingival colour systems, with mixtures altered by 10% increments, notably increased the gingival colour space covered by the original systems. The authors concluded that there are clear differences between the basic gingival colours produced by distinct manufacturers using the same nomenclature. Ceramic samples produced by mixing basic gingival colours are a resource with the potential to improve subjective gingival shade matching.
11
Othman, Ahmed, Maximillian Sandmair, Vasilios Alevizakos, and Constantin von See. "The fracture resistance of 3D-printed versus milled provisional crowns: An in vitro study." PLOS ONE 18, no. 9 (September 1, 2023): e0285760. http://dx.doi.org/10.1371/journal.pone.0285760.
Full textAbstract:
Background CAD/CAM has considerably transformed the clinical practice of dentistry. In particular, advanced dental materials produced via digital technologies offer unquestionable benefits, such as ideal mechanical stability, outstanding aesthetics and reliable high precision. Additive manufacturing (AM) technology has promoted new innovations, especially in the field of biomedicine. Aims The aim of this study is to analyze the fracture resistance of implant-supported 3D-printed temporary crowns relative to milled crowns by compression testing. Methods The study sample included 32 specimens of temporary crowns, which were divided into 16 specimens per group. Each group consisted of eight maxillary central incisor crowns (tooth 11) and eight maxillary molar crowns (tooth 16). The first group (16 specimens) was 3D printed by a mask printer (Varseo, BEGO, Bremen, Germany) with a temporary material (VarseoSmile Temp A3, BEGO, Bremen, Germany). The second group was milled with a millable temporary material (VitaCAD Temp mono-color, Vita, Bad Säckingen, Germany). The two groups were compression tested until failure to estimate their fracture resistance. The loading forces and travel distance until failure were measured. The statistical analysis was performed using SPSS Version 24.0. We performed multiple t tests and considered a significance level of p <0.05. Results The mean fracture force of the printed molars was 1189.50 N (±250.85) with a deformation of 1.75 mm (±0.25). The milled molars reached a mean fracture force of 1817.50 N (±258.22) with a deformation of 1.750 mm (±0.20). The printed incisors fractured at 321.63 N (±145.90) with a deformation of 1.94 mm (±0.40), while the milled incisors fractured at 443.38 N (±113.63) with a deformation of 2.26 mm (±0.40). The milled molar group revealed significantly higher mechanical fracture strength than the 3D-printed molar group (P<0.001). However, no significant differences between the 3D-printed incisors and the milled incisors were found (p = 0.084). There was no significant difference in the travel distance until fracture for both the molar group (p = 1.000) and the incisor group (p = 0.129). Conclusion Within the limits of this in vitro investigation, printed and milled temporary crowns withstood masticatory forces and were safe for clinical use.
12
Bebsh, Muna, Asmaa Haimeur, and Rodrigo França. "The Effect of Different Surface Treatments on the Micromorphology and the Roughness of Four Dental CAD/CAM Lithium Silicate-Based Glass-Ceramics." Ceramics 4, no. 3 (August 31, 2021): 467–75. http://dx.doi.org/10.3390/ceramics4030034.
Full textAbstract:
Objective: This study aimed to investigate and compare the effect of various surface treatments on the micromorphology and the roughness of four CAD/CAM lithium silicate-based glass-ceramics (LSGC). Method: Eighty specimens of four LDGC materials (IPS e. max® CAD (Ivoclar-Vivadent, Liechtenstein, Schaan), Vita Suprinity® (Vita Zahnfabrik, Bad Säckingen, Germany), Celtra Duo® (Dentsply, Hanau-Wolfgang, Germany) and n!ce (Straumann, Basel, Switzerland)) were used for this study. All specimens were highly polished with 400, 600, 1200 grit silicon carbide paper and then polished with 3 µm and 1 µm polycrystalline diamond suspension liquid with grinding devices. Each group of ceramic was assigned to one of the following three surface treatments (1) sand-blasting (SB) with 50 µm Al2O3 at 70 psi for 10s, (2) hydrofluoric acid etching (HF) with 5% hydrofluoric acid, according to the manufacturer instructions, (3) and a combination of sand-blasting and hydrofluoric acid (SB + HF). All specimens were cleaned with ethanol for 2 min and placed in an ultrasonic unit with distilled water for 15 min. The microstructure was analyzed by scanning electron microscopy (SEM). The surface roughness and topography were evaluated with atomic force microscopy in tapping mode (AFM). Statistical analysis was done using two-way ANOVA and Tukey tests (α = 5%). Results: All surface treatments had a significant effect on LDGC surface roughness compared to the untreated surface (p < 0.05). The sand-blasting treatment had a significantly higher mean surface roughness value for Vita Suprinity and Celtra Duo compared to other surface treatments (p < 0.05). However, there was no significant difference for surface roughness between sand-blasting and sand-blasting + etching for e.max CAD and n!ce. The hydrofluoric acid produced less surface roughness compared to other surface treatments but was able to change the surface structure. (5) Conclusions: The sand-blasting + etching treatment could be a sufficient method to produce surface roughness for all LSGC types.
13
Demirtag, Z., and AK Culhaoglu. "Surface Roughness of Ceramic-Resin Composites After Femtosecond Laser Irradiation, Sandblasting or Acid Etching and Their Bond Strength With and Without Silanization to a Resin Cement." Operative Dentistry 44, no. 2 (March 1, 2019): 156–67. http://dx.doi.org/10.2341/17-391-l.
Full textAbstract:
SUMMARY Objectives: The aim of this study was to investigate the effects of femtosecond laser irradiation, sandblasting, or acid etching treatments on the surface roughness of ceramic-resin composites and also shear bond strength (SBS) with and without silanization to a resin cement. Methods: Samples of Vita Enamic (VE; Vita Zahnfabrik, Bad Säckingen, Germany) and Lava Ultimate (LU; 3M ESPE, Seefeld, Germany) were classified into control (no treatment), sandblasting, hydrofluoric acid, and femtosecond laser groups (n=30). Surface roughness was determined using two-dimensional contact profilometry. Surface topography was evaluated using a three-dimensional contact profilometer and a scanning electron microscope. Then groups were divided into two subgroups with similar surface roughness values, including control (C), control + silane (C-S), sandblasting (SB), sandblasting + silane (SB-S), hydrofluoric acid (HF), hydrofluoric acid + silane (HF-S), femtosecond laser (FS), and femtosecond laser + silane (FS-S) groups (n=15). Panavia F 2.0 resin cement was applied to the sample surfaces using an SDI SBS rig (SDI Limited, Bayswater, Australia). The SBS test was performed after water storage (24 h, 37°C) and thermocycles (2000 cycles, 5°C to 55°C), and failure modes were evaluated. Results: The highest surface roughness was observed in the FS group, and the highest SBS was observed in the FS-S group for both VE and LU (p<0.001). Silanization improved the SBS of VE significantly (p<0.001) in all surface treatments but did not improve that of LU except in the FS group (p=0.004). There was a significantly moderate negative correlation in the VE/SB group (p=0.012) and a moderate positive correlation in the VE/HF group (p=0.049). Conclusions: Femtosecond laser irradiation was found to be more effective than sandblasting or acid etching in increasing the surface roughness, and it was also the most effective surface treatment with silanization on the SBS of a resin cement to the ceramic-resin composites.
14
Ezmek, Bahadır, and Numan Aydin. "Do Polishing Methods and Colorant Beverages Affect the Color Stainability of 3D-printed Permanent Restorations?" Journal of Advanced Oral Research 14, no. 2 (November 2023): 161–68. http://dx.doi.org/10.1177/23202068231199551.
Full textAbstract:
Aim: This in vitro study evaluated the effect of polishing methods on the color stainability of 3D-printed permanent restorations while immersed in colorant beverages (distilled water, tea, coffee, and red wine) for 30 days. Materials and Methods: A total of 120-disc-shaped samples (10 mm × 1.5 mm) were fabricated using a stereolithography printer (Formlabs 3B, Formlabs, Massachusetts) with a three-dimensional (3D)-printable permanent resin (Permanent Crown, Formlabs, Massachusetts). The samples were polished with mechanical polishing, Optiglaze (GC Dental Products Corp, Aichi, Japan), or Vita Akzent LC (VITA Zahnfabrik, Bad Säckingen, Germany) ( n = 40). Initial color measurements were performed using a spectrophotometer (VITA Easyshade V; Vita Zahnfabrik). Then the samples were divided into four different subgroups depending on beverages immersed in distilled water, coffee, tea, and red wine ( n = 10). After immersion in beverages for 30 days, color measurements were repeated. Color changes were calculated using the CIEDE2000 color change (Δ E00) formula. Δ E00 was evaluated according to 50:50% color perceptibility (PT00 = 0.81) and acceptability (AT00 = 1.81) thresholds. A two-way analysis of variance (ANOVA), Tukey HSD test with Bonferroni adjustment, and paired-sample t-tests were used for statistical evaluation. Results: The highest ΔE00 was noted in mechanical polishing groups ( p < .001). Red wine caused the most significant discoloration in the mechanical polishing group ( p < .05). ΔE00 of mechanical polish groups showed a significantly higher color change than the perceptibility and acceptability thresholds ( p < .001). Optiglaze can reduce 3D-printed permanent restoration discoloration caused by all beverages, Vita Akzent LC can reduce discoloration caused by tea and red wine. Conclusion: Glaze materials can reduce the restoration discoloration caused by colorant beverages.
15
Kwon, So Ran, R. Steven Kurti, and Berj Der Boghossian. "Direct Measurement of Stain Retention in Third Molars." Journal of Contemporary Dental Practice 14, no. 6 (2013): 1060–64. http://dx.doi.org/10.5005/jp-journals-10024-1451.
Full textAbstract:
ABSTRACT Aim To directly determine the mass of dye retained in teeth following exposure to aqueous solutions of Rhodamine B and to correlate tooth color modifications. Materials and methods Extracted third molars (25) were selected and sectioned at the cementoenamel junction for coronal staining. Pulp tissue was removed and teeth sonicated to remove debris. Teeth were kept in deionized water for 12 hours and subsequently weighed. They were then stained for 4 hours in 5 ml of Rhodamine B dye at two different concentrations. The samples were then subjected to two 8 hours rinses in deionized water. The tooth shade was recorded with a commercially available intraoral spectrophotometer (Vita Easyshade Compact, Vita Zahnfabrik, Bad Säckingen, Germany) at baseline (T1), after dye immersion (T2), and after water rinsing (T3). A standard absorption curve was then used to calculate the dye mass in the rinse solutions as well as the posttreatment stain solutions. All solution optical absorption curves were recorded using a laboratory research spectrophotometer (Cary 300, Agilent, USA). The mass of dye in each solution was then calculated from the standard curve relating optical absorption to aqueous dye concentration. Results An average change in the CIE (a) values of 8.0 ± 0.3 were observed for concentrations of Rhodamine B similar to the optical appearance of wine or other darkly colored juices while an increase of 10× in concentration gave values too high to measure using a standard intraoral spectrophotometer. By measuring the optical absorbance of the staining solutions before and after the staining process, we were able to measure dye retention of 54 ± 26 micrograms per gram of tooth. Conclusion While no significant correlation could be found between the amount of stain retention in the dentition and the tooth shade due to the high uncertainties in the spectroscopic measurements, we were able to show that this method should admit such comparisons for future research. Clinical significance The development of a reliable chromophore infiltration model may provide standardized and reproducible results in evaluating tooth whitening efficacy. How to cite this article Kurtir Jr RS, Boghossian BD, Kwon SR. Direct Measurement of Stain Retention in Third Molars. J Contemp Dent Pract 2013;14(6):1060-1064.
16
Silveira, Marcos Paulo Motta, Nathália de Carvalho Ramos, Guilherme da Rocha Scalzer Lopes, João Paulo Mendes Tribst, and Marco Antonio Bottino. "Bond Strength between Different Zirconia-Based Ceramics and Resin Cement before and after Aging." Coatings 12, no. 10 (October 21, 2022): 1601. http://dx.doi.org/10.3390/coatings12101601.
Full textAbstract:
The objective of this study was to evaluate the bond strength of different stabilized zirconias with resin cement and evaluate the susceptibility to thermal aging of the adhesive interface. Zirconia discs (Vita Zahnfabrik, Bad Säckingen, Germany) were obtained: 3Y-TZP first generation (translucent), 3Y-TZP third generation (high-translucent), 4Y-PSZ (super-translucent), and 5Y-PSZ (extra-translucent). Each disc had its surface polished with a standardized protocol. The specimens were cleaned and sintered according to the manufacturer’s recommendation (conventionally: ~12 h). However, 3Y-TZP groups were subdivided into subgroups and sintered following the speed sintering process (~80 min). After their sintering shrinkage, the dimensions of the final discs were 12 mm × 2 mm. The specimens were blasted with 50 μm aluminum oxide (1 cm distance, 2 bar pressure, and 2 s/cm²), cleaned, and silanized with an MDP primer. After the surface treatment, a resin cement cylinder was built on the ceramic surface (Ø = 1 mm; h = 2 mm). Half of the specimens of each group were subjected to a microshear bond strength test in a universal testing machine after 24 h of cementation, while the other half were subjected to thermocycling prior to the bond strength test (6000 cycles; 5 °C–55 °C, 30 s for each bath). Bond strength data were submitted to two-way ANOVA and Tukey’s test (95%), as well as Weibull analysis, to determine adhesive reliability. Bond strength was statistically different among the materials, and only 3Y-TZP third generation and 4Y-PSZ were not affected by thermal aging. The speed sintering method was statistically similar to the conventional process for 3Y-TZP first generation. However, 3Y-TZP third generation showed higher immediate bond strength when speed sintered. The Weibull modulus was superior for conventional 3Y-TZP third generation and 4Y-PSZ. In this study, thermal aging caused a degradation of the adhesive interfaces of 3Y-TZP first generation and 5Y-PSZ with the resin cement; however, it did not affect the interfaces of 3Y-TZP third generation and 4Y-PSZ. The speed sintering method did not affect the long-term bond strength with the resin cement. Adhesive reliability was superior for 3Y-TZP third generation and 4Y-PSZ.
17
Köse, Hazal Deniz, and Zehra Güner. "Evaluation of color stability after the application of a bleaching agent to different composite resins." International Dental Research 12, Suppl. 1 (December 31, 2022): 79–84. http://dx.doi.org/10.5577/intdentres.453.
Full textAbstract:
Aim: In dentistry, it is desirable to preserve the properties of composites for a long time. With the development of technologies, the number of different composites used in dental treatment has increased. With contemporary patients’ aesthetic expectations, bleaching treatmens are often sought, and the literature contains many studies on the effects of bleaching on composites. Our study aimed to examine the color stability of different types of composites immersed in different solutions after bleaching treatment. Methodology: A total of 72 samples (n = 8) of three composite materials were examined: Omnichroma (Tokuyama Dental Co., Tokyo, Japan), Estelite Posterior (Tokuyama Dental Co., Tokyo, Japan), and Quadrant (Cavex, Holland BV, Netherlands). All specimens were subjected to Total Blanc (Nova DFL, Rio de Janeiro, Brazil), which is an office-type bleaching agent. After bleaching treatments, the specimens were immersed in distilled water. The baseline measurements were then recorded. After being immersed in distilled water, tea, or coffee for seven days, the final color measurements were recorded. A VITA Easy Shade device (Vita Zahnarzt, Bad Säckingen, Germany) was used to take color measurements. The CIEDE2000 formula was used to calcuate ΔE00 values. The Kruskal–Wallis test was used to compare the ΔE00 values obtained from the composite samples to assess color stability. The results were rated at a significance level of p < 0.05. Results: After bleaching treatments, the interaction between the different composites and the solutions in which they were immersed had a statistically significant effect on ΔE00 values (p < 0.05). The highest mean value was obtained with the quadrant composite material that was immersed in the coffee solution. Conclusion: It is clear that tea and coffee cause discoloration in dental composites after bleaching treatments. Due to the sorption of these solutions into the composite structure, dentists should warn patients to be cautious about consuming beverages after bleaching. How to cite this article: Köse HD, Güner Z. Evaluation of color stability after the application of a bleaching agent to different composite resins. Int Dent Res 2022;12(Suppl.1):79-84. https://doi.org/10.5577/intdentres.453 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
18
Fagogeni, Irini, Joanna Metlerska, Tomasz Falgowski, Maciej Górski, Mariusz Lipski, and Alicja Nowicka. "Effectiveness of Teeth Whitening after Regenerative Endodontics Procedures: An In Vitro Study." Journal of Clinical Medicine 11, no. 23 (November 28, 2022): 7016. http://dx.doi.org/10.3390/jcm11237016.
Full textAbstract:
Discolouration resulting from regenerative endodontic procedures may have a negative impact on the quality of life of treated patients; therefore, it is recommended to minimize this risk by selecting appropriate scaffolds and barrier materials, and if discolouration occurs, the use of a simple, cost-effective and minimally invasive technique, such as whitening, should be considered. This in vitro study aimed to evaluate tooth discolouration after two- and single-visit regenerative endodontic procedures and the effectiveness of subsequent whitening procedures with carbamide peroxide. Two hundred bovine incisors were included in this study and divided into twenty groups based on the tested material combinations. Two groups were control groups, one with saline and the other group with blood. In the 12 groups, the experiment was designed to be consistent with the two-visit regenerative endodontic procedures. Triple antibiotic paste or calcium hydroxide were placed in the root canal, and then scaffolds (e.g., blood or platelet-rich fibrin) and barrier materials (Biodentine, OrthoMTA or MTA Repair HP) were applied after rinsing the disinfectant pastes. In the six groups that corresponded to the single-visit regenerative endodontic procedure, the use of a disinfectant paste was omitted. Subsequently, the specimens were bleached twice with carbamide peroxide at a 7-day interval. Colour change measurements were performed using a spectrophotometer (VITA Easyshade Compact 5.0, VITA Zahnfabrik, Bad Säckingen, Germany). Statistical analysis was performed with the Kruskal–Wallis H test, the independent t-test and t-test for related samples. Tooth discolouration was noticed after two- and single-visit regenerative endodontic procedures, except for the platelet-rich fibrin+MTA Repair HP group. After the first and second whitening procedures, all of the tested two- and single-visit regenerative endodontic procedures groups showed a change in the colour of the crown, which was noticeable to the naked eye (∆E > 3.3). When analysing the ∆E value between the first and second bleaching procedures, no changes in the colour of teeth were visually noticed in the calcium hydroxide and platelet-rich fibrin +MTA Repair HP groups (∆E < 3.3). Single-visit regenerative endodontic procedures are suggested if possible; however, if two-visit regenerative endodontic procedures are performed, it is recommended to use calcium hydroxide as the disinfectant paste because of the lower staining potential. In the context of discolouration, platelet-rich fibrin is advisable for use as a scaffold. The whitening procedure is worth considering, but does not guarantee a return to the original tooth colour, especially when triple antibiotic paste is used.
19
Shono, NN, and HNA Al Nahedh. "Contrast Ratio and Masking Ability of Three Ceramic Veneering Materials." Operative Dentistry 37, no. 4 (July 1, 2012): 406–16. http://dx.doi.org/10.2341/10-237-l.
Full textAbstract:
SUMMARY Statement of the Problem Porcelain veneer materials are translucent and are therefore affected by their thickness as well as the color of the underlying substructure, which limits their masking ability and compromises the esthetic result in heavily stained teeth. Purpose The purpose of this study was to compare the contrast ratio (CR) and masking ability of three different veneering ceramics with two thicknesses by measuring the color differences over white and black backgrounds. Correlations between CR and masking ability of these veneering ceramics were evaluated. Methods and Materials A total of 30 disc-shaped specimens (12 mm diameter × 1.0 mm or 1.5 mm) were fabricated in shade A2 from three types of all-ceramic systems: IPS e.max Press (IPSe; Ivoclar Vivadent, Schaan, Liechtensein), Vita VM7 (VM7; VITA Zahnfabrik, Bad Säckingen, Germany), and Nobel Rondo Press Alumina: Solo (NRPA; Nobel Biocare, Zürich-Flughafen, Switzerland). The CR, defined as the ratio of illuminance (Y) of the test material when placed on the black background (Yb) to the illuminance of the same material when placed over a white background (Yw), was determined (CR=Yb/Yw). The color (CIE L*a*b*) and Y of each specimen were measured over standard white and black tiles using a spectrophotometer (ColorEye 7000 A, Model C6, GretagMacbeth, New Windsor, NY, USA). Masking abilities of the specimens were determined by measuring the color difference (ΔE) over white and black backgrounds. Both CR and ΔE data were analyzed using two-way analysis of variance (ANOVA). One-way ANOVA was used to compare the mean values of CR across the three materials followed by the Duncan multiple comparison test. The correlations between CR and ΔE were determined by comparing R2 values obtained from a linear regression analysis. A Student t-test for independent samples was used to compare the mean contrast ratio and ΔE values for the two thicknesses. Results CR values of NRPA were significantly less than those of IPSe and VM7, and the CR of IPSe was higher than that of VM7. Furthermore, CR increased as the thickness of the discs increased to 1.5 mm for all three materials. Mean ΔE values were significantly higher with 1.0-mm-thick discs than with 1.5-mm discs. Among the three materials it was observed that NRPA had the highest ΔE when compared with IPSe or VM7, whereas the ΔE of the latter two were not significantly different from one another. There was a strong linear correlation between CR and masking ability. Conclusion CR and masking ability are affected by the type as well as the thickness of the ceramic used. IPSe and VM7 are similar in their masking abilities, whereas NRPA had the lowest masking ability. NRPA was the most translucent, followed by VM7; IPSe was the most opaque. None of the materials tested was able to completely mask the black background. It is therefore recommended that the type of ceramic should be chosen according to each clinical situation.
20
Pirvulescu, Ioana Ligia. "Influence of Different Illuminants on Spectrophotometric Tooth Color Determination." Journal of Clinical and Medical Research, September 20, 2022. http://dx.doi.org/10.37191/mapsci-2582-4333-4(4)-117.
Full textAbstract:
Statement of problem: The vast majority of studies address the comparison of visual and instrumental tooth color determination. Although, the lighting conditions of the environment may affect the clinical shade matching performance. This study evaluated if and how different light sources can influence the spectrophotometric determination of natural tooth color. Purpose: The purpose of this study was to evaluate the precision of the spectrophotometer in tooth shade determination under the influence of different illuminants. Material and method: Three examiners, determined the shade of an upper central incisor with Vitapan 3D-Master (VITA Zahnfabrik, Bad Säckingen, Germany) and with the spectrophotometer (Vita Easyshade V, Vita Zahnfabrik, Bad Säckingen, Germany). A special fabricated device with eight light sources, designed to offer reproductible lighting conditions, was used to determine the efficiency of instrumental color determination under different illuminants. Results: Natural light (300 lux) and dental unit light at full intensity (32500 lux) produced the less ∆Eab modification. Color coordinates determined in the presence of halogen light (1800 lux), neon ambient light (3000 lux), LED with cold light (21200 lux), halogen light with neon ambient light (23400 lux), both warm and cold LED simultaneously (36000 lux) and all eight light sources of the device (44000 lux), suffered a slight modification of ∆E ab, which does not exceed the acceptability and the perceptibility threshold. The illuminant that caused the biggest modifications in color coordinates was LED warm light (1940 lux) with a ∆Eab 5.804 ± 0.271, that exceeds the acceptability and perceptability threshold. Conclusions: LED warm light influences the instrumental tooth color determination and when used, can lead to errors in communication of the color to the dental laboratory, which can cause esthetic failure of a prosthetic restoration. The best illuminant for color determination is natural light, or illuminants that simulate lighting in daily living conditions. Clinical implications: Based on the spectrophotometric readings, it was demonstrated that tooth color shifts with the change in ambient lighting conditions. Therefore, color determination should be performed with natural daylight illumination.
21
Kimpara, Estevão T., Fabíola Pessoa P. P. Leite, Luiz Felipe Valandro, Juliana Gonçalves, and Marco Antonio Bottino. "Bond strength of dual – cured resin cements to a glass infiltrated alumina ceramic." Brazilian Dental Science 9, no. 2 (August 18, 2010). http://dx.doi.org/10.14295/bds.2006.v9i2.479.
Full textAbstract:
The present study evaluated the union resistance among the surface of the ceramic In Ceram Alumina® (Vita Zahnfabrik, Bad-Säckingen, Germany) and two different types of resin cements (Panavia F, Kuraray® e Relyx, 3M®). Six ceramics blocks were made with dimensions of 6x6x5mm following the technical guide lines wich were duplicated in composite resin (W3D MASTER®). One of the faces of the ceramic block (6mmx5mm) was sandblasted with the Rocatec system® and cemented with the two different cements under constant load of 750g to the correspondents faces composite blocks. After the storage of the samples (seven days in distilled water at 37º) each group formed by ceramic, cement and resin was split up in two axis X and Y and it were obtained specimens with adehive area of 1mm² ± 0,1. Two groups (n=27) were obtained: PanaviaF group and RelyX group. Each sample was fixed with cyanocrylate in an adapted device which was attached to a universal testing machine (EMIC) and then subjected to tensile forces at a crosshead of 0.5 mm/min and load cell of 10kgf. The results showed that the medium values of rupture (MPa) for the PanaviaF group (median=30.98 ± standart deviation=5.43) are statistically different comparing to RelyX group (median 12.48 ± standart deviation 3.54) (p-value=0.,001). The conclusion of this study was that the Panavia F had better adhesive resistance than RelyX. All fractures analyzed occurred at the adhesive zone, with no findings of cohesive fracture of the porcelain.
22
ERTÜRK AVUNDUK, Ayşe Tuğba, and Ebru DELİKAN. "Effect of effervescent C vitamins on the surface roughness and color stability of composite resins: A SEM study." JOURNAL OF BIOTECHNOLOGY AND STRATEGIC HEALTH RESEARCH, March 5, 2023. http://dx.doi.org/10.34084/bshr.1226373.
Full textAbstract:
Objective: To investigate the effect of effervescent vitamins C on the color change and surface roughness of resin composites.
Methods: 30 specimens (8 mm*2 mm) were prepared for each restorative material (G-ænial Posterior, Solidex). The specimens were polymerized with LED device for 20 seconds and were incubated in distilled water for 24 hours for post-polymerization. Initial color values were measured using a spectrophotometer (Vita Easyshade V, Vita Zahnfabrik, Bad Säckingen, Germany), and initial surface roughness was measured with roughness tester (Mitutoyo SJ-410 Surftest Analyzer). The specimens were randomly divided into 3 groups according to their immersion solution (Redoxon, Ocean efervit, and distilled water). During the 28-day test period, the specimens were immersed in the solutions 2 times a day. Color changes and surface roughness measurement procedures were repeated. Data were subjected to One-way ANOVA, Tukey test, and t-test (p=0.05).
Results: When the color change (ΔE00) results are examined statistically; the highest ∆E values were observed in the Redoxon group, regardless of the restorative material. G-ænial Posterior specimens from both study groups and Solidex specimens incubated in Redoxon showed clinically unacceptable discoloration. When the average roughness values (Ra) are analyzed statistically, roughness values above the threshold surface roughness (Ra=0.2 µm) was detected in all groups. However, no statistically significant difference between groups (p>0.05).
Conclusion: Despite the fact that effervescent C vitamins significantly increased the discoloration of the tested composite resins, not cause a statistically significant difference in surface roughness.
23
YILMAZ EVMEK, Betül, and Elif YEĞİN. "Effect of Simulated Gastric Juice on Color Stability of Different Artificial Teeth." Clinical and Experimental Health Sciences, January 13, 2024. http://dx.doi.org/10.33808/clinexphealthsci.1269843.
Full textAbstract:
Objective: The current study aimed to evaluate the gastric juice effect on the artificial teeth discoloration in patients with gastroesophageal reflux disease (GERD) under in vitro conditions.
Methods: Three different artificial teeth (Ivostar, Vivodent PE, Phonares II) were used in the study (n=12). A spectrophotometer (VITA Easyshade Compact; VITA Zahnfabrik, Bad Säckingen, Germany) was used for initial color measurements after keeping the specimens in distilled water for 24 h. Then, they were immersed in 5% hydrochloric acid (HCl) at 37°C (pH=2) for 91 h and the color measurements were
repeated. The CIEDE2000 formulation was used to calculate the color changes. The statistical analysis was performed with one-way ANOVA and Tukey HSD tests.
Results: Although the color differences of Vivodent PE and Phonares II materials did not exhibit a statistically significant difference (p=.95; p > .05), there was a significant difference between Ivostar and other materials (p=.02, p=.01). The 50:50% detection threshold (PT) was exceeded with Vivodent PE and Phonares II materials, while the 50:50% acceptability threshold (AT) was exceeded with Ivostar material.
Conclusion: After exposure to gastric acid, all groups exhibited perceptible color differences. In the group of acrylic resin artificial teeth, the color difference was above acceptability threshold and would be better to improve. While the acrylic resin artificial teeth exhibited the highest discoloration, artificial teeth containing nanohybrid composite resin showed the least discoloration. These should be considered in
the selection of artificial teeth in patients with GERD.
24
Moaleem, Mohammed M. Al, Omaima A. Al-layl, Manar A. Alhomood, Walaa A. Ageeli, Alzhouor A. Qsadi, Tahani I. M. Mohammed, Emtinan S. Baraqt, Bashayr M. A. Zubayni, Nada I. Alalmaie, and Ahmed H. M. Huraysi. "Computer Engineering Complete Dentures Workflow: Systematic Techniques Review." Journal of Pharmaceutical Research International, December 4, 2021, 207–20. http://dx.doi.org/10.9734/jpri/2021/v33i53a33653.
Full textAbstract:
Background: The progress in the use of computer-aided design/computer aided manufacturing (CAD/CAM) to fabricat removable prosthodontic prostheses in dental clinics has been exponential. Commercially existing CAD/CAM denture techniques grow every year with increasing benefits to dentists and patients.
Study Design: Systematic review.
Aims: This review assessed and evaluated the different clinical production protocols of presently accessible CAD/CAM denture systems that offer decision support for dental practitioners.
Methodology: Data for the current object were collected by surveys from different companies manufacturing the Computer Engineering Complete Denture (CECDs). All related subjects published at the last 10 years were collected and included in this review. Techniques were arranged in alphabetical order, as follows. AvaDent Digital Dentures (Global Dental Science), Baltic Denture Creator System (Merz Dental GmbH), and Ceramill Full Denture System (Amann Girrbach AG) can manufacture denture fabrication in three visits, including a try-in step. DENTCA Digital Dentures (Whole You Nexteeth, Inc) can also perform this in three visits. The Wieland Digital Denture (Ivoclar Vivadent, Inc) can manufacture in four dental appointments. Recently developed VITA VIONIC Digital System (VITA Zahnfabrik, Bad Säckingen, Germany) can perform two-step CECD manufacturing.
Results: Most of the systems involved subtractive manufacturing for the fabrication of their dentures and only closed systems. However, Baltic Denture System and VITA VIONIC material types are an open structure that allow users to choose among different handling protocols. It can be shared with several unclosed digital scanner, CAD software options, and milling machines.
Conclusions: The six existing CECD fabrication systems offer many advantages. The decision on which technique to use may be contingent on the dentist’s prosthodontic expertise, patient output amount, and requirements concerning denture individualization.
25
Chemin, K., M. Rezende, MC Costa, ADY Salgado, JL de Geus, AD Loguercio, A. Reis, and S. Kossatz. "Evaluation of At-home Bleaching Times on Effectiveness and Sensitivity with 10% Hydrogen Peroxide: A Randomized Controlled Double-blind Clinical Trial." Operative Dentistry, August 9, 2021. http://dx.doi.org/10.2341/20-104-c.
Full textAbstract:
SUMMARY Objectives: The aim of this randomized double-blind controlled clinical trial was to evaluate different protocols for at-home use of 10% hydrogen peroxide in whitening effectiveness and tooth sensitivity. Methods: Seventy-two patients were selected according to the inclusion and exclusion criteria, with the upper central incisors having color A2 or darker according to the Vita Classical scale (VITA Zahnfabrik, Bad Säckingen, Germany) and randomized into two groups: 10% hydrogen peroxide applied once daily for 15 minutes (HP 15) or applied once daily for 30 minutes (HP 30). Bleaching was performed for 14 days in both groups. The color was evaluated before bleaching, during bleaching (1st and 2nd weeks), and 1 month after the bleaching treatment using the Vita Classical, Vita Bleachedguide 3D-MASTER, and Vita Easyshade spectrophotometer (VITA Zahnfabrik). Dental sensitivity was recorded by the patients using the numerical rating scale (0–4) and visual analogue scale (0-10 cm). Color data were evaluated by two-way analysis of variance (ANOVA) of repeated measures (group vs. treatment time). The Mann-Whitney test was performed to contrast the means (α=0.05). Tooth sensitivity was assessed by Fisher’s exact test (p=1.00) and intensity of tooth sensitivity was evaluated by the Mann-Whitney test (α=0.05) for both scales. Results: A significant whitening effect was observed after 2 weeks of bleaching for all color measurements (p=0.01), with no difference between HP 15 and HP 30 (p>0.05). Also, the absolute risk and intensity of tooth sensitivity were similar (47%; p>0.05). Conclusions: The effectiveness and tooth sensitivity of at-home bleaching carried out with 10% hydrogen peroxide applied for 15 minutes or 30 minutes are similar.
26
Terra, RMO, KL da Silva, L. Vochikovski, E. Sutil, M. Rezende, AD Loguercio, and A. Reis. "Effect of Daily Usage Time of 4% Hydrogen Peroxide on the Efficacy and Bleaching-induced Tooth Sensitivity: A Single-blind Randomized Clinical Trial." Operative Dentistry, August 23, 2021. http://dx.doi.org/10.2341/20-058-c.
Full textAbstract:
Clinical Relevance Although color change was slightly lower in a 3-week 30-minutes/day protocol, than in the 120-minute protocol, this could be compensated by an extra week of bleaching. The advantage of the shorter protocol is the reduced daily application, making the procedure more comfortable for the patients. SUMMARY Objective: Compare the risk/intensity of tooth sensitivity (TS) and color change of a 30-minute vs. the recommended 120-minute application time of 4% hydrogen peroxide (HP) for at-home bleaching. Methods: A single-blind, parallel, randomized clinical trial was conducted with 92 adult patients with caries and restoration-free anterior teeth A2 or darker, randomly allocated to two groups. Bleaching trays containing 4% HP were used for three-weeks. A four-week regimen was also offered to the patients for the 30-min group after the end of the 3-week protocol. The color change was assessed with the Vita Classical (VITA Zahnfabrik, Bad Säckingen, Germany) and Vita Bleachedguide shade guides (VITA Zahnfabrik) and the Vita Easyshade spectrophotometer (VITA Zahnfabrik) at baseline, weekly, and 30 days after the bleaching. The absolute risk and the intensity of TS were assessed daily using the 0-10 visual analogue scale (VAS) and 5-point Numerical Rating Scale (NRS) scale, and patient satisfaction was recorded with a Likert 0-7 scale. Risk of TS (Fisher’s test), intensity of TS in NRS scale (Mann-Whitney test), VAS scale (t-test), and a color change (t-test) were compared. Results: The 30-minute group saw color change of around 1 SGU inferior to the 120-minute group in all-time assessments (p<0.05). After an extra week of bleaching, mean color change was similar (p>0.05). Patient satisfaction was high for both groups (p>0.05). Conclusions: A four-week protocol of at-home dental bleaching with 4% HP for 30 minutes/day whitened teeth similarly to the 120 minutes/day protocol, with low intensity of dental sensitivity and high patient satisfaction.
27
Kobayashi, M., Y. Niizuma, R. Sugai, and A. Manabe. "Influence of the Crystallization Firing Process on Marginal and Internal Adaptation of Silicate-based Glass-ceramic Inlays Fabricated With a CAD/CAM Chairside System." Operative Dentistry, October 26, 2023. http://dx.doi.org/10.2341/22-120-l.
Full textAbstract:
SUMMARY Objective Computer-aided design/computer-aided manufacturing (CAD/CAM) systems are widely used in dental treatment. Clinicians can use chairside CAD/CAM technology, which has the advantage of being able to fabricate inlays on the same day. We aimed to evaluate the effects of crystallization firing processes, fabrication methods (one-step and two-step), and materials on marginal and internal adaptations of silicate-based glass-ceramic all-ceramic inlays fabricated with CAD/CAM chairside systems. Methods Ten artificial mandibular left first molars were prepared with standardized ceramic class II mesial-occlusal (MO) inlay cavities. Optical impressions were obtained using CEREC Omnicam Ban. IPS e-max CAD (IE), (Ivoclar Vivadent, Schaan, Liechtenstein), Initial LiSi Block (LS) (Hongo, Bunkyoku, Tokyo, Japan), VITA Suprinity (SP), (Vita Zahnfabrick, Bad Säckingen, Germany), and Celtra Duo (CD) (Ivoclar Vivadent, Schaan, Liechtenstein) (n=10) were milled using CEREC MC XL (Bensheim, Germany). IE and SP were crystallization-fired using CEREC Speed Fire. The silicone replica technique was used for the measurement of internal (axial and pulpal walls) and marginal (cervical and occlusal edge) adaptations. The adaptations were measured using a thin layer of light-body polyvinyl siloxane impression material placed between the master tooth inlay preparation and restoration. Marginal and internal adaptations of IE, LS, SP, and CD were measured using a stereomicroscope (500×). For IE and SP, marginal and internal adaptations were measured before and after the crystallization firing process. Data analyses were conducted using one-way ANOVA and the Tukey test. For IE and SP, marginal and internal adaptations before and after the crystallization firing process were analyzed using the t-test. The significance level was set at α=0.05. Results One-way ANOVA revealed statistically significant differences in occlusal and cervical edge marginal adaptations among the material groups (p<0.001). The Tukey HSD test revealed a significant difference in marginal occlusal and cervical edge adaptations between LS and CD groups and IE and SP groups (p≤0.05). For IE and SP inlays, the t-test revealed a significant difference between occlusal and cervical edge adaptations before the crystallization firing process and those after the crystallization firing process, with the latter group showing a more significant discrepancy in adaptation than the former group (p≤0.05). Conclusions Fabrication methods (one- and two-step) affected the marginal adaptation compatibility but not internal compatibility of MO inlays. The crystallization firing process affected the marginal adaptation of inlays using lithium silicate or lithium disilicate glass-ceramics. However, adaptation to the cavity was considered clinically acceptable for all materials.
28
Korkut, B., G. Dokumacigil, N. Murat, PY Atali, B. Tarcin, and GB Gocmen. "Effect of Polymerization on the Color of Resin Composites." Operative Dentistry, September 19, 2022. http://dx.doi.org/10.2341/20-155-l.
Full textAbstract:
SUMMARY Objectives: The initial shade of a resin-based restorative material should be the same as that after polymerization. In this study, the color changes of translucent and opaque composites from nine different brands were assessed after polymerization using a spectrophotometer and cross-polarization (CP) photography. Methods and Materials: Thirteen nano-hybrid (Essentia LE, GC Corp; Ceram.x Duo SphereTEC A2E/A2D, Dentsply Sirona; Harmonize A2E/A2D, Kerr Dental; IPS Empress Direct A2E/A2D, Ivoclar Vivadent; Mosaic EN/A2, Ultradent Products; Clearfil Majesty Es-2 A2E/A2D, Kuraray Noritake; Charisma Topaz A2/OL, Kulzer), two supra nano-hybrid (Estelite Asteria NE/A2B; Tokuyama), two nano-filled (Filtek Ultimate A2E/ A2D; 3M) light-curing resin composites, and one micro-hybrid (Essentia MD, GC Corp) light-curing resin composite were tested. Disc-shaped specimens (n=5) were prepared using silicone molds (12 × 5 mm) and polymerized from both sides using an LED curing light (Elipar Deepcure S, 3M) at a light intensity of 1470 mW/cm2. Measurements were performed before and 1 day after polymerization using a contact-type dental spectrophotometer (Easy Shade 5, VITA Zahnfabrik, Bad Säckingen, Germany) and a combination of CP photography and Photoshop CC software (Adobe Inc, San Jose, CA, USA). Spectrophotometry and CP photography ΔE* values were calculated; the perceptibility threshold was a ΔE* value of 1.2. VITA spectrophotometry color change scores were also calculated and evaluated. Results: The overall ΔE* values ranged between 0.34 and 12.56. Two-way analysis of variance (ANOVA) showed that color change was associated most strongly with composite brand (p<0.001), followed by shade (p=0.002). Color change (p=0.002) and degree of darkening/lightening (p<0.001) were significantly greater for dentin compared to enamel shades. Clearfil Majesty Es-2 (Kuraray Noritake) showed significant lightening, whereas all other composites showed darkening after polymerization. All composite brands presented perceptible (ΔE*≥1.2) color changes. Estelite Asteria (Tokuyama), Ceram.x Duo SphereTEC (Dentsply Sirona), and Harmonize (Kerr Dental) were considered the most reliable brands regardless of the shade. The spectrophotometry and CP photography methods were positively correlated (p<0.001). Also, CIEDE2000 and CIELCH (also referred to as CIE L*c*h) color systems were positively correlated based on the ΔE* values (p<0.001). Conclusions: Despite improvements in the chemical composition of, and fillers for, contemporary resin-based composites (RBCs), all tested composite brands showed perceptible color change after polymerization, except for some shades. Under the conditions in this study, it is preferable to polymerize the composite during the trial phase, before identifying the most appropriate shade. CP photography in combination with Photoshop analysis appears to be a reliable and promising approach for color evaluation.
29
Américo, MA, FF Portella, R. Zimmer, FR Garcia, DJ Porto, VL Barbosa, HJR Oballe, and EG Reston. "Effect of a Toothpaste for Sensitive Teeth on the Sensitivity and Effectiveness of In-office Dental Bleaching: A Randomized Clinical Trial." Operative Dentistry, October 26, 2023. http://dx.doi.org/10.2341/23-009-c.
Full textAbstract:
SUMMARY Objectives The present study aimed to evaluate the desensitizing effect of toothpaste for sensitive teeth on patient tooth sensitivity and on bleaching efficacy of the 38% hydrogen peroxide bleaching agent used for in-office bleaching compared to a regular toothpaste in a randomized clinical trial. Methods and Materials Forty-eight patients having maxillary right central incisors with darkness greater than A1 were selected for the present double-blind randomized clinical trial. Patients were randomly allocated into two groups: the placebo group, which used regular toothpaste, and the experimental group, which used sensitivity toothpaste. The intervention consisted of applying toothpaste with the aid of an individual tray for a period of 4 minutes daily, starting one week before the first bleaching session and interrupting use immediately after the second session. After allocation to one of the groups, individuals received in-office dental bleaching with a 40-minute application of 38% hydrogen peroxide for two sessions with an interval of one week. The incidence and intensity of sensitivity were assessed using a visual analogue scale and a numeric analogue scale. Sensitivity was measured immediately before each session, 1 hour, 24 hours, and 48 hours after each bleaching session and four weeks after the second bleaching session. Tooth shade was evaluated using a spectrophotometer and by comparison with the VITA Classical Shade Guide (Vita Zahnfabrik, Bad Säckingen, Germany). Tooth shade was evaluated before the first bleaching session, one week after the first bleaching session, one week after the second bleaching session and four weeks after the second bleaching session. Participants and professionals who performed the bleaching, shade, and sensitivity assessments were blinded to the group of patients they were treating or assessing. For the incidence of hypersensitivity, the results were evaluated by comparing the groups at different evaluation times with the Mann-Whitney test for comparison between groups, the Friedman test for repeated measures, and the Tukey test for comparison of times. Shade change on the guide was analyzed using the Mann-Whitney test for comparison between groups and the Wilcoxon test for comparison between times. Shade change by the spectrophotometer was analyzed using the t-test for comparison between groups and the paired t-test for comparison between times. All analyses were performed with a significance level of 5%. Results There was no difference in the pattern of dental hypersensitivity between groups. For all shade measures, there was no difference between the bleaching results, and no statistically significant difference was observed between the study groups. Conclusion The use of arginine-based desensitizing toothpaste did not interfere with the bleaching ability of hydrogen peroxide and was not effective in reducing the sensitivity caused by in-office tooth bleaching.