Journal articles: 'Polyvinylsiloxane'

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McCabe, J. F. "A polyvinylsiloxane denture soft lining material." Journal of Dentistry 26, no. 5-6 (July 1998): 521–26. http://dx.doi.org/10.1016/s0300-5712(98)00022-0.

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Pereira, Jefferson Ricardo, Janaina Salomon Ghizoni, Paulo Henrique Orlato Rossetti, Naudy Brodbeck May, and Accácio Lins do Valle. "Imperfections in plaster surfaces caused by the release of hydrogen gas of polyvinylsiloxane impression materials." Journal of Research in Dentistry 1, no. 2 (September 7, 2013): 98. http://dx.doi.org/10.19177/jrd.v1e2201398-106.

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Purpose: The purpose of this study was to evaluate the number of bubbles of hydrogen liberation from different polyvinylsiloxane impression materials. Material and Methods: A metallic stainless steel jig containing six receptacles, like trays, was constructed to accommodate the impression materials. The molds were poured immediately, and at 1 hour, 12 hours and 24 hours in order to evaluate the number of bubbles present in each sample. Each sample was made of improved stone (type IV), totaling 48 samples for each polyvinylsiloxane impression material. After setting, the surface of each sample was inspected under a light microscope at 40x magnification and the number of bubbles was recorded. Results were submitted to statistical analysis by ANOVA and Tukey Test (p=.05). Results: ANOVA test showed statistically significant differences among the polyvinylsiloxane impression materials, as determined by the number of bubbles (p<.05). The Tukey test showed statistically significant differences among the three groups (p<.05). Conclusions: Statistical differences were found between addition silicone with regard to the ideal time to wait for the plaster cast, showing that Aquasil results in fewer bubbles in plaster, followed by the President and Simply Perfect samples.

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Farhan, Daniel, Wiebke Lauer, Guido Heydecke, Ghazal Aarabi, and Daniel Reissmann. "Handling of Polyvinylsiloxane Versus Polyether for Implant Impressions." International Journal of Prosthodontics 29, no. 4 (July 2016): 403–5. http://dx.doi.org/10.11607/ijp.4663.

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Stannard, J. G., and M. Sadighi-Nouri. "Retarders for polyvinylsiloxane impression materials: Evaluation and recommendations." Journal of Prosthetic Dentistry 55, no. 1 (January 1986): 7–10. http://dx.doi.org/10.1016/0022-3913(86)90060-0.

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Schenz, Natalie, Vincent Schwarz, Romed Hörmann, and Adriano G. Crismani. "Impression material accuracy for palatal orthodontic miniscrews." Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie 81, no. 6 (September 8, 2020): 427–39. http://dx.doi.org/10.1007/s00056-020-00245-3.

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Abstract Purpose This study investigates the accuracy of abutment transfer with current impression materials and provides a concise overview, including other relevant factors, in order to enable clinicians to make an informed decision about the optimal impression for this treatment procedure. Methods In all, 96 impressions of a cadaver head with two orthodontic miniscrews in place were taken with four common impression materials by two observers and using two methods of application. After pouring with a standard type IV stone and abutment transfer, all models and the upper jaw (which had been separated from the head) were scanned in a standard model scanner (Zirkonzahn® [Zirkohnzahn GmbH, Gais, Italy] S600 ARTI) and evaluated using a computer-aided design (CAD) program (GOM-Inspect [Gesellschaft für optische Messtechnik m.b.H., Braunschweig, Germany]). The deviations were measured at six points per screw and statistically evaluated with SPSS® (IBM, Chicago, IL, USA). Results Optimal values were obtained with biphasic polyvinylsiloxane, while monophasic polyvinylsiloxane, alginate and polyether also resulted in acceptable accuracy. Observer experience showed no effect and the method of application had only a minor effect on accuracy. Conclusions Within the limitations of this study, it seems that all impression materials are suitable for miniscrew abutment transfer, provided that methods of intraoral adaptation of the orthodontic appliance can be employed. If higher accuracy is needed or for clinicians with less experienced, a biphasic polyvinylsiloxane impression with the putty-wash technique should be used as this combination reduces setting time. The most cost-effective version, alginate, can be used if the consequences of greater deviations can be handled. Caution is advised with polyether if undercuts are present.

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van den Driesche, S., J. V. Pimentel, D. Puchberger-Enengl, L. Brandhoff, and M. J. Vellekoop. "Easy-to-realise Polyvinylsiloxane Microfluidic Connectors for PDMS Chips." Procedia Engineering 120 (2015): 675–78. http://dx.doi.org/10.1016/j.proeng.2015.08.720.

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Chark, Davin W., Joseph D. Brunworth, and Jason H. Kim. "An Auricular Bolster Dressing Using Polyvinylsiloxane (PVS) Impression Material." Laryngoscope 119, S1 (2009): S172. http://dx.doi.org/10.1002/lary.20451.

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Lunn, David J., Charlotte E. Boott, Kelly E. Bass, Timothy A. Shuttleworth, Niall G. McCreanor, Sofia Papadouli, and Ian Manners. "Controlled Thiol-Ene Functionalization of Polyferrocenylsilane-block-Polyvinylsiloxane Copolymers." Macromolecular Chemistry and Physics 214, no. 24 (October 17, 2013): 2813–20. http://dx.doi.org/10.1002/macp.201300520.

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HAUBENREICH, JAMES E., and PAUL B. OSBORNE. "Modification of a metal stock tray for a polyvinylsiloxane impression." Journal of the American Dental Association 136, no. 8 (August 2005): 1138–39. http://dx.doi.org/10.14219/jada.archive.2005.0318.

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Buenting, John E., Rodger M. Dalston, and Amelia F. Drake. "The Acoustic Assessment of Nasal Area in Infants." American Journal of Rhinology 8, no. 6 (November 1994): 305–10. http://dx.doi.org/10.2500/105065894781874160.

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The present study was undertaken to determine whether a modification to commercially available acoustic rhinometry (AR) instrumentation might allow equipment designed for use in adults to accurately determine the nasal cavity configuration of infants and children. The standard wave tube was replaced with a version having a narrow (0.312 cm2) internal diameter. After calibration, this device was used to generate nasal area curves for the nasal cavity of a full term infant cadaver. Direct volume measurements and area measurements of polyvinylsiloxane nasal casts of the same specimen were used to evaluate the accuracy of the acoustic method. AR correlated well with nasal cast data (r = 0.88) for total nasal cavity area. The acoustic method underestimated the total area at the nasal valve by only 1.8 mm2 (22.1 mm2 vs. 23.9 mm2) and overestimated choanal area by 10 mm2 (56.9 mm2 vs 46.9 mm2) compared to data derived from polyvinylsiloxane nasal casts. In addition, AR measured total nasal volume to within 5.2% percent of the value obtained by direct measurement. This is the first report that AR can produce useful nasal area information in infants, and it suggests that the device has utility both in airway research and as a nasal patency screening tool in the pediatric population.

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Li, Ping, Dorina Hasselbeck, Alexey Unkovskiy, Feraydoon Sharghi, and Sebastian Spintzyk. "Retentive Characteristics of a Polyetheretherketone Post-Core Restoration with Polyvinylsiloxane Attachments." Polymers 12, no. 9 (September 3, 2020): 2005. http://dx.doi.org/10.3390/polym12092005.

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A new application of a polyetheretherketone (PEEK) post-core restoration combined with polyvinylsiloxane (PVS) attachments was proposed and substantiated. This study aimed to evaluate retentive characteristics of the PEEK post-core restoration with PVS attachment systems. Specimens with PVS attachments were fabricated to evaluate retention force during 10,000 cyclic dislodgements. Additionally, the retention forces of PVS attachments with three different values of Shore hardness were further measured before and after aging treatments. The results of cyclic dislodgement test indicated a strong negative linear relationship between the cyclic times and retention force (p < 0.0001, r = −0.957). Furthermore, the retention forces of the PVS were significantly improved with Shore hardness increased, which was also affected by the aging treatment (F (2, 138) = 10.95, p < 0.0001). Therefore, the PEEK post-core restoration with PVS attachments exhibited the favorable retention force, which could be a promising alternative for dental prostheses.

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Orenstein, Ira H., Vincent Petrazzuolo, Paul Gorczyca, and Jae Ho Chun. "Use of transparent polyvinylsiloxane to replicate gingival peri-implant soft tissue." Journal of Prosthetic Dentistry 90, no. 4 (October 2003): 410–12. http://dx.doi.org/10.1016/s0022-3913(03)00433-5.

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Miles, Brett A., Brent J. Hansen, and John Paul Stella. "Polyvinylsiloxane as an Alternative Material for the Intermediate Orthognathic Occlusal Splint." Journal of Oral and Maxillofacial Surgery 64, no. 8 (August 2006): 1318–21. http://dx.doi.org/10.1016/j.joms.2006.04.011.

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PURK, JOHN H., MICHAEL G. WILLES, DANIEL E. TIRA, J. DAVID EICK, and SHIRLEY H. HUNG. "THE EFFECTS OF DIFFERENT STORAGE CONDITIONS ON POLYETHER AND POLYVINYLSILOXANE IMPRESSIONS." Journal of the American Dental Association 129, no. 7 (July 1998): 1014–21. http://dx.doi.org/10.14219/jada.archive.1998.0356.

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Walker, Mary P., Cynthia S. Petrie, Reem Haj-Ali, Paulette Spencer, Chris Dumas, and Karen Williams. "Moisture Effect on Polyether and Polyvinylsiloxane Dimensional Accuracy and Detail Reproduction." Journal of Prosthodontics 14, no. 3 (September 2005): 158–63. http://dx.doi.org/10.1111/j.1532-849x.2005.04024.x.

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Tjan, Anthony H. L., Harold Nemetz, Lan T. P. Nguyen, and Raymond Contino. "Effect of tray space on the accuracy of monophasic polyvinylsiloxane impressions." Journal of Prosthetic Dentistry 68, no. 1 (July 1992): 19–28. http://dx.doi.org/10.1016/0022-3913(92)90278-i.

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Rajapur, Anand, Santosh Dixit, Chetan Hoshing, and Sonal Raikar. "The Influence of Tray Space and Repeat Pours on the Accuracy of Monophasic Polyvinylsiloxane Impression." Journal of Contemporary Dental Practice 13, no. 6 (2012): 824–29. http://dx.doi.org/10.5005/jp-journals-10024-1236.

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ABSTRACT Aim While literature demonstrates that the optimum accuracy is obtained with the custom trays, the use of stock trays for elastomeric impressions appears to be popular in general practice. The aim of the study was to evaluate the effect of thickness of impression material on the dimensional accuracy of impressions made from monophasic polyvinylsiloxane impression material. This study also studies the dimensional stability of the impressions poured at different time intervals. Materials and methods A metal model simulating two abutment teeth was fabricated along with reference lines inscribed on them. Custom impression trays were fabricated with spacer thickness of 2, 4 and 6 mm. impressions were made using monophasic polyvinyl siloxane impression material. The impressions were poured and stone models were obtained. The dimensional accuracy of the impressions were determined indirectly by measuring the dimensional changes of the recovered stone models. The dimensional stability was also evaluated by pouring the impressions at time intervals of 1 hour, 24 hours and 7 days. The obtained data was statistically analyzed. Results The results of the study indicated that the impressions made from 2 and 4 mm tray space produced more accurate stone models when compared to 6 mm tray space. There was no significant deviation in the mesiodistal and buccolingual dimensions when impressions were made using impression trays with 2, 4 and 6 mm tray spacers. There was a significant decrease in interabutment distance (p = 0.001) and height of the abutment (p = 0.024) when impressions were made using impression trays with a tray space of 6 mm. There were no significant differences found among the stone models obtained from 1 hour, 24 hours and 1 week pour times. Conclusion The mesiodistal and buccolingual dimensions of the abutments were not affected by the variations in thickness of impression material. There was a decrease in the height of the abutment which was clinically not significant. As the thickness of the impression material increased, the interabutment space decreased, which is a factor of concern when impressions are made for fixed partial dentures. Clinical significance When monophasic polyvinylsiloxane is used as the impression material, stock trays can be used for making impressions for individual castings. How to cite this article Rajapur A, Dixit S, Hoshing C, Raikar S. The Influence of Tray Space and Repeat Pours on the Accuracy of Monophasic Polyvinylsiloxane Impression. J Contemp Dent Pract 2012;13(6):824-829.

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Troendle, G. Roger, and Karen B. Troendle. "The Use of Injectable Polyvinylsiloxane as Medium for Border-Molding Denture Impressions." Journal of Prosthodontics 1, no. 2 (December 1992): 121–23. http://dx.doi.org/10.1111/j.1532-849x.1992.tb00443.x.

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Choi, Jeong-Hun, Min-Kang Kim, Hee-Gweon Woo, Ho-Jun Song, and Yeong-Joon Park. "Modulation of Physical Properties of Polyvinylsiloxane Impression Materials by Filler Type Combination." Journal of Nanoscience and Nanotechnology 11, no. 2 (February 1, 2011): 1547–50. http://dx.doi.org/10.1166/jnn.2011.3332.

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Neissen, Linda C., Howard Strassler, Philip D. Levinson, Gregory Wood, and Jack Greenbaum. "Effect of latex gloves on setting time of polyvinylsiloxane putty impression material." Journal of Prosthetic Dentistry 55, no. 1 (January 1986): 128–29. http://dx.doi.org/10.1016/0022-3913(86)90088-0.

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Bell, G. W., and M. H. Clark. "Polyvinylsiloxane dental impression material used to support the pinna after severe injury." British Journal of Oral and Maxillofacial Surgery 42, no. 3 (June 2004): 257–58. http://dx.doi.org/10.1016/j.bjoms.2004.02.009.

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Marrs, S. J., J. C. Thomason, M. J. Cowling, and T. Hodgkiess. "A Replica Method for the Study of Marine Biofilms." Journal of the Marine Biological Association of the United Kingdom 75, no. 3 (August 1995): 759–62. http://dx.doi.org/10.1017/s0025315400039199.

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A replica method involving the use of a polyvinylsiloxane impression material with a resin cast, particularly suitable in the study of marine biofilms, is described. The technique has advantages over other methods in that it is quick, non-toxic, non-destructive and inexpensive. Replicas of critical-point dried eggcases of the dogfishScyliorhinus canicula(L.) (Elasmobranchii: Squaliformes) showed the replica to be true down to the size of bacteria. It was also possible to replicate larger areas such as patches of living barnacles on an intertidal rock.The study of marine biofilms often involves the use of destructive techniques such as conventional scanning electron microscopy (SEM), histology andin vacuospectroscopic methods (Baier & Meyer, 1986), so a single surface may not be examined repeatedly. Alternatively, the surface of interest may not be amenable to examination by standard techniques due to, for example, large size or incompatibility of the material of interest. In materials science the use of replica techniques to overcome such problems have been common (Goodhew, 1973), though techniques commonly involve the use of solvents (Loh, 1989) or silicone elastomers that may have a curing period of several hours (Gordon, 1984) and are consequently unsuitable for the study of biofilms. Scott (1982) reviewed the use of dental impression materials for field use in metallurgy and in recent years, dental impression materials have been used in the study of plant morphology (Green & Linstead, 1990). In this paper we consider the use of a hydrophilic polyvinylsiloxane impression material in the study of both microscopic and macroscopic marine biofilms.

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Begum, Shahnaj, Mahenaz Munira, Fakrul Islam, Hasina Mahmuda Ferdushi, and Alia Sultana. "Comparative Study on Dimensional Stability of Polyvinylsiloxane and Alginate as Interocclusal Recording Materials." Update Dental College Journal 7, no. 1 (July 24, 2017): 10–13. http://dx.doi.org/10.3329/updcj.v7i1.33303.

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Introduction: The fabrication of dental prosthesis requires the transfer of interocclusal records from patient's mouth to an articulator using different kinds of recording materials. Any inaccuracy in these interocclusal records leads to occlusal error in the final prosthesis. Interocclusal recording materials should have good dimensional stability for precise articulation.Purpose: The aim of this in vitro study was to evaluate and compare the dimensional stability of two types of interocclusal recording materials at various time intervals.Materials and Methods: The materials used in this study were polyvinylsiloxane (Reprosil Silicone Putty) and alginate (irreversible hydrocolloid). In this experimental study, specimen of polyvinylsiloxane and alginate were prepared from a custom made stainless steel die according to ADA specification no-19, in the form of a disk included three parallel lines on the surface which were provided as an indicator to see the dimensional stability of tested materials. The distance between parallel lines was measured at two fixed points using a traveling micrometer microscope. A total of 20 samples were made from group-A and group-B consisting of ten samples of each group. The measurements were made at time intervals of 1, 24, 48 and 72 hrs.Results: Two readings were taken for each sample at each time interval and the mean was considered to measure the dimensional change by comparing with that of the original measurements in the die. The results obtained were statistically analyzed using SPSS version 12 and paired t test. The result of significance was expressed as p value. P value <0.05 was considered as significance. Both materials showed significant changes ie <0.05.Conclusion: Dimensional stability is influenced by both the material used and the time factors and was found to decreased dimensional stability as the time factors increased. Group A was dimensionally stable than Group-B.Update Dent. Coll. j: 2017; 7 (1): 10-13

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Camardella, Leonardo Tavares, David Silveira Alencar, Hero Breuning, and Oswaldo de Vasconcellos Vilella. "Effect of polyvinylsiloxane material and impression handling on the accuracy of digital models." American Journal of Orthodontics and Dentofacial Orthopedics 149, no. 5 (May 2016): 634–44. http://dx.doi.org/10.1016/j.ajodo.2015.10.027.

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Liu, Chun-Qing, Hong-Tao Zhao, Ping Xie, and Rong-Ben Zhang. "Synthesis and characterization of a novel reactive ladderlike 4,4?-phenylene ether-bridged polyvinylsiloxane." Journal of Polymer Science Part A: Polymer Chemistry 38, no. 15 (2000): 2702–10. http://dx.doi.org/10.1002/1099-0518(20000801)38:15<2702::aid-pola100>3.0.co;2-4.

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Labban, Nawaf. "Management of the flabby ridge using a modified window technique and polyvinylsiloxane impression material." Saudi Dental Journal 30, no. 1 (January 2018): 89–93. http://dx.doi.org/10.1016/j.sdentj.2017.10.004.

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Galbany, Jordi, Ferran Estebaranz, Laura M. Martínez, Alejandro Romero, Joaquín De Juan, Daniel Turbón, and Alejandro Pérez-Pérez. "Comparative analysis of dental enamel polyvinylsiloxane impression and polyurethane casting methods for SEM research." Microscopy Research and Technique 69, no. 4 (2006): 246–52. http://dx.doi.org/10.1002/jemt.20296.

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Holtan, James R., Paul S. Olin, and Joel D. Rudney. "Dimensional stability of a polyvinylsiloxane impression material following ethylene oxide and steam autoclave sterilization." Journal of Prosthetic Dentistry 65, no. 4 (April 1991): 519–25. http://dx.doi.org/10.1016/0022-3913(91)90292-5.

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Schweyen, Ramona, C. Arnold, J. M. Setz, and J. Hey. "Retentive characteristics of individual and prefabricated polyvinylsiloxane overdenture attachments: alternative treatment options for geriatric patients." Clinical Oral Investigations 23, no. 3 (July 21, 2018): 1425–34. http://dx.doi.org/10.1007/s00784-018-2568-x.

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Pai, Umesh Y., Vikram Simha Reddy, and Rushad Nariman Hosi. "A Single Step Impression Technique of Flabby Ridges Using Monophase Polyvinylsiloxane Material: A Case Report." Case Reports in Dentistry 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/104541.

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Complete denture fabrication in clinically compromised situations such as flabby ridges is a challenging task for the clinician. Accurate impressioning of these tissues plays a major role in ensuring a well-fitting prosthesis. In this paper, the authors have proposed a newer technique of impression making of the flabby tissues using a combination of readily available newer and older materials to ensure an accurate and easy impression of these tissues.

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Gregory, G., R. Das Gupta, B. Morgan, and G. Bounds. "Polyvinylsiloxane dental bite registration material used to splint a composite graft of the nasal rim." British Journal of Oral and Maxillofacial Surgery 37, no. 2 (April 1999): 139–41. http://dx.doi.org/10.1054/bjom.1998.0094.

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Lee, Hyang-Ok, and In-Bog Lee. "Rheological properties of polyvinylsiloxane impression materials before mixing and during setting related to handling characteristics." Korea-Australia Rheology Journal 24, no. 3 (September 2012): 211–19. http://dx.doi.org/10.1007/s13367-012-0026-x.

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McCrosson, J., S. W. Sharkey, G. McR Smith, and R. A. Anderson. "Quantification of hydrogen gas released from polyvinylsiloxane impression materials in contact with die stone materials." Journal of Dentistry 15, no. 3 (June 1987): 129–32. http://dx.doi.org/10.1016/0300-5712(87)90069-8.

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Varenberg, M., and S. Gorb. "Shearing of fibrillar adhesive microstructure: friction and shear-related changes in pull-off force." Journal of The Royal Society Interface 4, no. 15 (February 27, 2007): 721–25. http://dx.doi.org/10.1098/rsif.2007.0222.

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To characterize the effect of shearing on function of fibrillar adhesive microstructure, friction and shear-related changes in pull-off force of a biomimetic polyvinylsiloxane mushroom-shaped fibrillar adhesive microstructure were studied. In contrast to a control flat surface, which exhibited pronounced stick–slip motion accompanied with high friction, the fibrillar microstructure demonstrated a stable and smooth sliding with a friction coefficient approximately four times lower. The structured contact also manifested zero pull-off force in a sheared state, while the flat surface exhibited highly scattered and unreliable pull-off force when affected by contact shearing. It appears that the fibrillar microstructure can be used in applications where a total attachment force should be generated in a binary on/off state and, most surprisingly, is suitable to stabilize and minimize elastomer friction.

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Patil, PadmakarS, Ramesh Chowdhary, and Sunil Mishra. "Comparison of custom trays and stock trays using polyvinylsiloxane to evaluate linear dimensional accuracy: Anin vitrostudy." Journal of Indian Prosthodontic Society 8, no. 3 (2008): 156. http://dx.doi.org/10.4103/0972-4052.49021.

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Boott, Charlotte E., David J. Lunn, and Ian Manners. "Versatile and controlled functionalization of polyferrocenylsilane-b -polyvinylsiloxane block copolymers using a N -hydroxysuccinimidyl ester strategy." Journal of Polymer Science Part A: Polymer Chemistry 54, no. 2 (July 14, 2015): 245–52. http://dx.doi.org/10.1002/pola.27727.

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Yi, Myong-Hee, Joon-Sung Shim, Keun-Woo Lee, and Moon-Kyu Chung. "Drying time of tray adhesive for adequate tensile bond strength between polyvinylsiloxane impression and tray resin material." Journal of Advanced Prosthodontics 1, no. 2 (2009): 63. http://dx.doi.org/10.4047/jap.2009.1.2.63.

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Peregrina, Alejandro, Martin F. Land, Phillip Feil, and Connie Price. "Effect of two types of latex gloves and surfactants on polymerization inhibition of three polyvinylsiloxane impression materials." Journal of Prosthetic Dentistry 90, no. 3 (September 2003): 289–92. http://dx.doi.org/10.1016/s0022-3913(03)00420-7.

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Lu, Ming Yue, Yang Li, Qing Song He, and Zhen Dong Dai. "Study on Polarization and Adhesion Property of Gecko Inspired Mushroom-Shaped Pillars." Materials Science Forum 1013 (October 2020): 19–24. http://dx.doi.org/10.4028/www.scientific.net/msf.1013.19.

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Geckos can run swiftly on various surfaces, is not only related to the micro-nanostructure of their setae, but also related to the charged keratin in biological tissues of epidermis. Many gecko-inspired structural materials have been developed in order to obtain desired adhesion property. Much research has been done to improve their adhesion by changing chemical composition and optimizing micro-nanostructure, but little research has been done on the effect of surface charge. Therefore, this study aims to investigate the effect of surface charge on the adhesion of gecko-inspired materials, and to explore a new way to improve their adhesion performance. In this work, the dry adhesive materials made of polyvinylsiloxane (PVS) with mushroom-shaped pillars were polarized under high voltage. The results showed that polarized samples with the mushroom-shaped pillars facing the positive electrode have more negative charge, and the adhesion was improved a lot with increasing charge.

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Sharma, Dr Suchita, Dr Girish Kumar, Dr Siddarth Narula, and Dr Kapil Sharma. "Comparative Analysis of Dimensional Accuracy of Vinylsiloxane Ether, Polyvinylsiloxane and Extended Pour Alginate Impression Materials- An in Vitro Study." Scholars Journal of Applied Medical Sciences 08, no. 02 (February 20, 2020): 753–58. http://dx.doi.org/10.36347/sjams.2020.v08i02.071.

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Yang, Yi, Tao Yang, Qiu Li, Chen Xu Wang, and Ashfaq Shuaib. "A new reproducible focal cerebral ischemia model by introduction of polyvinylsiloxane into the middle cerebral artery: a comparison study." Journal of Neuroscience Methods 118, no. 2 (August 2002): 199–206. http://dx.doi.org/10.1016/s0165-0270(02)00142-5.

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Rakitov, Roman, and Stanislav N. Gorb. "Brochosomal coats turn leafhopper (Insecta, Hemiptera, Cicadellidae) integument to superhydrophobic state." Proceedings of the Royal Society B: Biological Sciences 280, no. 1752 (February 7, 2013): 20122391. http://dx.doi.org/10.1098/rspb.2012.2391.

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Leafhoppers (Insecta, Hemiptera, Cicadellidae) actively coat their integuments with brochosomes, hollow proteinaceous spheres of usually 200–700 nm in diameter, with honeycombed walls. The coats have been previously suggested to act as a water-repellent and anti-adhesive protective barrier against the insect's own exudates. We estimated their wettability through contact angle (CA) measurements of water, diiodomethane, ethylene glycol and ethanol on detached wings of the leafhoppers Alnetoidia alneti , Athysanus argentarius and Cicadella viridis . Intact brochosome-coated integuments were repellent to all test liquids, except ethanol, and exhibited superhydrophobicity, with the average water CAs of 165–172°, and the apparent surface free energy (SFE) estimates not exceeding 0.74 mN m −1 . By contrast, the integuments from which brochosomes were removed with a peeling technique using fluid polyvinylsiloxane displayed water CAs of only 103–129° and SFEs above 20 mN m −1 . Observations of water-sprayed wings in a cryo-scanning electron microscope confirmed that brochosomal coats prevented water from contacting the integument. Their superhydrophobic properties appear to result from fractal roughness, which dramatically reduces the area of contact with high-surface-tension liquids, including, presumably, leafhopper exudates.

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Aras, Meena A., Vidya Chitre, and Ruksana Farooqui. "An In Vitro Study to Compare the Surface Roughness of Two Polyvinylsiloxane Impression Materials Following Ultraviolet Irradiation or Chemical Disinfection." International Journal of Experimental Dental Science 9, no. 2 (2020): 52–55. http://dx.doi.org/10.5005/jp-journals-10029-1215.

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Narrenthran, J. S., M. S. Muthu, and A. Renugalakshmi. "In vivo Scanning Electron Microscope Assessment of Enamel Permeability in Primary Teeth with and without Early Childhood Caries." Caries Research 49, no. 3 (2015): 209–15. http://dx.doi.org/10.1159/000367602.

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Background: Over the years, certain primary teeth have been shown to be highly sensitive to dental caries, while others have remained caries-free. It has been hypothesized that this may be attributed to differences in the permeability of the enamel surface. Aim: The aim of the study was to evaluate the hypothesized differences in the permeability of primary tooth enamel in children with and those without Severe Early Childhood Caries (S-ECC) using scanning electron microscopy. Materials and Methods: Sixteen children between 3 and 6 years of age were randomly selected and divided into two groups: Group 1, children without S-ECC (n = 8), and Group 2, children with S-ECC (n = 8). In each child, 4 teeth (the maxillary right and left central and lateral incisors) were subjected to evaluation. An impression was made with polyvinylsiloxane impression material, and scanning electron microscopy was used to inspect the negative replicas for droplets. Results: The results indicated higher significance when individual regions (cervical, middle, and incisal thirds) in the two groups were evaluated and compared. Similarly, the overall results showed high statistical significance between S-ECC and non-S-ECC teeth. Conclusion: There could be a positive relationship between the permeability of tooth enamel and the development of caries, which needs further research.

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Samra, Adriana Postiglione Buhrer, Marcos Pomini, Francielly Granville, Adrielly Zavolski, Fabio Brasil de Oliveira, and Ariangelo Hauer Dias. "Three-dimensional printed models versus conventional stone models." Brazilian Journal of Oral Sciences 19 (October 7, 2020): e209937. http://dx.doi.org/10.20396/bjos.v19i0.8659937.

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Aim: To compare the accuracy (trueness and precision)of cost-accessible three-dimensional (3D) printed models.Methods: A maxillary typodont (MM) was scanned andprinted 10 times in polylactic acid, resulting in 10 digitalmodels (DMs). Polyvinylsiloxane impressions were made toobtain 10 conventional stone models (SMs). All models werescanned and imported to CloudCompare software. The totalarea and three locations of interest were evaluated (zenith toincisal [Z-I], canine to canine [C-C], and first molar to canine[1M-C] distances). Total area evaluations were performed byaligning the MM and experimental models using the best-fitalgorithm and were compared using the Haussdorf distance.The distances between points of interest were measured usingthe point-picking tool at the same 3D coordinates. The meanvolumetric deviations were considered for trueness analysis.Precision was set as the standard deviation. Statisticaldifferences were evaluated using the Student’s t-test. Results:Total area volumetric comparisons showed that DMs showedsuperior trueness and precision (-0.02 ± 0.03) compared tothe SMs (0.37 ± 0.29) (P < 0.001). No differences between themodels were observed for Z-I (P = .155); however, SMs showedfewer deviations for C-C (P = .035) and 1M-C (P = .001) thanDMs. Conclusions: The DMs presented superior trueness andprecision for total area compared to the SMs; however, the SMswere more accurate when points of interest were evaluated.

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H. Mohammed, Dhuha, Abdalbseet A. Fatalla, and Ghassak H. Jani. "Comparison of Some Mechanical and Physical Properties of three Types of Impression Materials with Different Dental Implant Angulations." Biomedical and Pharmacology Journal 11, no. 3 (August 29, 2018): 1359–68. http://dx.doi.org/10.13005/bpj/1499.

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Choosing an appropriate impression material is a challenge for many dentists, yet an essential component to provide an excellent clinical outcome and improve productivity and profit. The purpose of present study was to compare wettability, tear strength and dimensional accuracy of three elastomeric impression materials, with the same consistencies (light-body). Three commercially available light body consistency and regular set 3M ESPE Express polyvinylsiloxane (PVS), 3M ESPE Permadyne polyether (PE), and Identium (ID), impression materials were comparedTear strength test, contact angle test and linear dimensional accuracy were evaluated for three elastic impression material. Among the three experimental groups PE impression material exhibited the higher mean values of tear strength, followed by ID group then PVS which showed the lowest mean value. For wettability test, Polyether group exhibited the lowest mean values of contact angle, followed by mean values of contact angle of ID group, while the PVS group showed the highest contact angle. There was a significant difference in the linear distance measurements between the two parallel impression coping/analogue assembly of the working models obtained by using (Identium, 3M ESPE ExpressPVS , 3M ESPE Permadyne polyether) the polyether impression materials provide higher tear strengths and lower wettability than elastomer impression materials and Identium material have acceptable tear strengths and wettability. All three experimental impression materials were distorted in both conditions (angled and parallel implant situations)

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Vovna, V. I., I. S. Os’mushko, V. V. Korochentsev, N. P. Shapkin, and M. V. Tutov. "A study of the electronic structure of polyvinylsiloxane (CH2CHSiO1.5) n by X-ray photoelectron spectroscopy and quantum chemical modeling in the DFT approximation." Journal of Structural Chemistry 51, no. 5 (October 2010): 875–80. http://dx.doi.org/10.1007/s10947-010-0133-9.

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Rattanasumawong, Sopit, Peerapong Santiwong, Somchart Raocharernporn, and Syrina Tantidhnazet. "Accuracy of Three Bracket Transfer Media for Indirect Bonding Techniques (IDB) Fabricated by Three-Dimensional Printing." Applied Mechanics and Materials 897 (April 2020): 179–84. http://dx.doi.org/10.4028/www.scientific.net/amm.897.179.

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To evaluate and compare the accuracy of bracket placement in three bracket transfer media techniques for indirect bonding. A total of 300 brackets were bonded on dental casts by indirect bonding techniques using three different bracket transfer media. The bracket positions were simulated by digital software. In the first two methods, digital models were designed with two types of markers, one with fully mocked up bracket (container method), and another with only marked bracket margins (marker method), then the models were printed out by a three-dimensional (3D) printer using pink resin and bracket transfer trays were vacuum formed on these models with polyvinylsiloxane. In the third methods, digital software was used to design full arch transfer trays, and printed by a stereolithographic 3D printer using elastic resin. With the transfer trays, the brackets were bonded onto dental stone casts, and a 3D model scanner was used to capture the final bracket positions on the casts. Superimpositions between the planned and actual bracket positions were done. Nonparametric statistical analyses were used to determine whether there were significant differences between planned and actual bracket positions and between the three methods. All significant differences in bracket position were less than 0.31 mm and most (95%) were less than 0.08 mm. Significant differences between all three methods were found. Indirect bonding methods using digital software combined with 3D printing show good accuracy with clinically insignificant positional discrepancies of less than 0.5mm.

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Bhochhibhoya, Amar, Binod Acharya, Samskar Bickram Rana, Rinu Sharma, Jemish Acharya, and Brijesh Maskey. "Survey of current materials and impression techniques for Complete Dentures among Nepalese Prosthodontists." Journal of College of Medical Sciences-Nepal 14, no. 2 (July 30, 2018): 75–80. http://dx.doi.org/10.3126/jcmsn.v14i2.20242.

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ABSTRACTBackground: Impression making is one of the critical factors in determining success or failure of complete denture therapy. The precise reproduction of edentulous foundation is essential for retention, stability, and support of the removable prosthesis. Evidence suggests that there is variability in materials and techniques regarding impressions making for complete dentures. There is little published information on studies conducted among Nepalese Prosthodontists. The purpose of this study was to evaluate current materials andmethods for impressions for complete denture prosthodontics in Nepal. Materials & Methods: A questionnaire based survey was conducted among Nepalese Prosthodontists. Ethical approval for the beginning of the study was obtained via Institutional Review Committee, Nepal Medical College. A self-administered anonymous questionnaire was distributed to the participants. Data were analyzed by using frequency distribution.Results: Majority of responses indicated use of irreversible hydrocolloid in stock metal tray for making the preliminary impression. The selective pressure was the predominantly used impression philosophy (78.3%). The most common material for the fabrication of custom trays was autopolymerizing acrylic resin (96.7%). All respondents border molded the custom tray prior to making the final impression. The final impression materials used were zinc oxide eugenol impression paste (73.3%), polyvinylsiloxane (11.7%), polyether (11.7%) and polysulphide (3.3%). Conclusion: Although there is variability in impression materials andtechniques used by Prosthodontists in Nepal for the fabrication of complete dentures, the results showed interesting trends. Most practitioners followed the traditional techniques of complete denture impression procedures.Keywords: complete denture; custom tray; edentulism; impression.

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Azevedo, Cristiana Godoy Sartori, Mario Fernando De Goes, Glaucia Maria Bovi Ambrosano, and Daniel C. N. Chan. "1-Year clinical study of indirect resin composite restorations luted with a self-adhesive resin cement: effect of enamel etching." Brazilian Dental Journal 23, no. 2 (April 2012): 97–103. http://dx.doi.org/10.1590/s0103-64402012000200002.

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In vitro studies have recommended enamel-etching before luting indirect restorations with self-adhesive resin cement. However, there is no scientific proof that this procedure has any clinical relevance. Thus, the aim of this study was to evaluate the effect of enamel-etching on the marginal quality of indirect composite resin restorations (inlay/onlay) using the self-adhesive cement RelyX Unicem clicker. Forty-two posterior teeth were selected from 25 patients that presented one or two teeth with large restorations in need of replacement. All teeth were prepared by the same operator and impressed with polyvinylsiloxane material. The composite resin restorations were built over plaster casts using the incremental technique with a LED device for light-curing the increments. The inlays/onlays were cemented according to one of the following protocols: 1. Etched group (ETR) - selective enamel phosphoric-acid etching + RelyX Unicem clicker; 2. Non-etched group (NER) - RelyX Unicem clicker alone. Each surface was light-cured for 60 s. Recalls occurred after 1 week (baseline), 6 and 12 months when the teeth were evaluated according to previously established scores (modified USPHS criteria). The clinical analysis showed little or no visible changes in the marginal quality after 1 year, even though a probe could detect all the restorations margins. Statistical analysis (Fisher’s exact test, p<0.05) detected no differences between the groups after 12 months. No restorations failed and no secondary caries were found. Enamel acid etching had no clinical relevance on the marginal quality of indirect composite resin restorations luted with RelyX Unicem clicker after 1 year of follow up.

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Journal articles on the topic 'Polyvinylsiloxane'

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