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Andreescu, Claudia Florina, Oana Botoaca, Horia Mihail Barbu, Doina Lucia Ghergic, Anamaria Bechir, and Anne Marie Rauten. "Deficiencies in Silicone Impression for Crowns and Bridges." Revista de Chimie 68, no. 10 (November 15, 2017): 2317–19. http://dx.doi.org/10.37358/rc.17.10.5876.
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There are many steps in fabrication of dental crowns and bridges at which an error can occur, and a technician can only fabricate a quality restoration if the impression itself is of adequate quality. All dental practitioners should have the ability to evaluate the quality of dental impression before sending to the laboratory. Elastomeric silicones (polysiloxane) are the most utilised impression materials in dental practice. The present study deal with the deficiencies of silicones dental impressions sent to commercial dental laboratories for fabrication of single crowns and bridges.
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Carlo, Hugo Lemes, Rodrigo Borges Fonseca, Carlos José Soares, Américo Bortolazzo Correr, Lourenço Correr-Sobrinho, and Mário Alexandre Coelho Sinhoreti. "Inorganic particle analysis of dental impression elastomers." Brazilian Dental Journal 21, no. 6 (2010): 520–27. http://dx.doi.org/10.1590/s0103-64402010000600007.
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The aim of this study was to determine quantitatively and qualitatively the inorganic particle fraction of commercially available dental elastomers. The inorganic volumetric fraction of two addition silicones (Reprosil Putty/Fluid and Flexitime Easy Putty/Fluid), three condensation silicones (Clonage Putty/Fluid, Optosil Confort/Xantopren VL and Silon APS Putty/Fluid), one polyether (Impregum Soft Light Body) and one polysulfide (Permlastic Light Body) was accessed by weighing a previously determined mass of each material in water before and after burning samples at 600ºC, during 3 h. Unsettled material samples were soaked in acetone and chloroform for removal of tthe organic portion. The remaining filler particles were sputter-coated with gold evaluation of their morphology and size, under scanning electron microscopy (SEM). Flexitime Easy Putty was the material with the highest results for volumetric particle fraction, while Impregum Soft had the lowest values. Silon 2 APS Fluid presented the lowest mean filler size values, while Clonage Putty had the highest values. SEM micrographs of the inorganic particles showed several morphologies - lathe-cut, spherical, spherical-like, sticks, and sticks mixed to lathe-cut powder. The results of this study revealed differences in particle characteristics among the elastometic materials that could lead to different results when testing mechanical properties.
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Kollefrath, Ralf, Marcel Savary, and Jörg Schwela. "An Evaluation of the Fit of Metal-Ceramic Restorations Made with an Autoclaved Silicone-Based Impression Material." Journal of Contemporary Dental Practice 11, no. 4 (2010): 63–70. http://dx.doi.org/10.5005/jcdp-11-4-63.
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Abstract Aim To demonstrate the clinical feasibility of autoclaving certain silicone impression materials in order to avoid potential cross-contamination during handling, transport, and subsequent processing. Background Semicritical devices are recommended to be treated at least with high-level disinfectants or actually steam sterilized at 134°C. To date dental impressions have been disinfected rather than sterilized, so the question remains should they be sterilized before being sent to the dental laboratory? Case Descriptions Two identical impressions per case were made of metal-ceramic crown and fixed partial denture preparations on the same patient using addition type polyvinyl siloxane (PVS) impression materials (AFFINIS, R Coltene/ Whaledent AG, 9450 Altstatten, Switzerland) in different trays. The first impression (IMPx1) was cleaned and treated with an intermediate-level disinfectant (FD 322.Fast Disinfection Spray, Durr Dental, 74321 Bietigheim-Bissingen, Germany). The second impression (IMPx2) was cleaned, treated with an intermediate-level disinfectant as with IMPx1, subjected to a computer tomography (CT) scan with a dimensional resolution of ±10 μm, steam sterilized, and then subjected to a second CT scan. The dimensional changes of the second impression after steam sterilization were calculated by comparing the overlay of the two CT scans and expressed by color coding of the impression graphics. After the second scan, the impression was sent to a dental laboratory to fabricate a metal-ceramic crown or metal-ceramic fixed partial denture restoration to the one produced from the first impression (IMPx1) subjected only to disinfection. This process was repeated for four clinical cases. Conclusion Impressions made with AFFINIS® silicone impression materials in a rigid reinforced polycarbonate impression tray or in a metal dual-arch tray can be autoclaved. The overall dimensional stability of the impressions and the quality of single crowns and small fixed partial dentures made using IMPx2 was not compromised. The maximum dimensional differences at the preparations of the nonautoclaved and the autoclaved impressions were found to be within acceptable limits of about 50–100 ìm. Clinical Significance Steam sterilization of AFFINIS® impressions is possible without adversely affecting dimensional change. In addition, clinicians can clearly indicate to the dental practice and laboratory personnel that sterilization of the impressions has been performed, cross-contamination is unlikely, and the impressions present no apparent health hazard during transport and subsequent processing. Disclosure Dr. Kollefrath is head of Research and Development, Elastomers at Coltène/ Whaledent AG, Altstätten, Switzerland, the manufacturer of the impression material evaluated in this report. Citation Kollefrath R, Savary M, Schwela J. An Evaluation of the Fit of Metal-Ceramic Restorations Made with an Autoclaved Silicone- Based Impression Material. J Contemp Dent Pract [Internet]. 2010 July; 11(4):063-070. Available from: http://www.thejcdp.com/journal/ view/volume11-issue4-kollefrath
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Haralur, Satheesh B., Majed S. Toman, Abdullah A. Al-Shahrani, and Abdullah A. Al-Qarni. "Dimensional Accuracy of Multiple Pour Cast from Different Elastomer Impression Techniques." International Journal of Prosthodontics and Restorative Dentistry 6, no. 3 (2016): 51–56. http://dx.doi.org/10.5005/jp-journals-10019-1155.
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ABSTRACT Context The elastomeric impression material is the most widely used impression material in contemporary dental practice; their accuracy is critical for the outcome of indirect restorations. The accurate duplicate cast obtained from single impression reduces the professional clinical time, patient inconvenience, and extra material cost. Aim To compare the accuracy of the cast obtained from various impression methods utilizing elastomer impression materials. Materials and methods The stainless steel working cast model assembly consisting of two abutments and one pontic area was fabricated. Two sets of six each custom aluminum trays were fabricated, with 5 mm spacer and 2 mm space. The impression methods evaluated in the study were additional silicone putty reline (two step), heavy-light body (one step), monophase (one step), and polyether (one step). Type IV gypsum casts were poured at intervals of 1, 12, 24, and 48 hours. The resultant cast was measured with a traveling microscope for comparative dimensional accuracy. The data obtained were subjected to analysis of variance test at significance level <0.05. Results The die obtained from putty reline two-step impression techniques had the percentage of variation for the height -0.36 to -0.97% with 0.40 to 0.90% increase in diameter. One-step heavy-light body impression dies recorded the increased width by 0.50 to 0.80% and height reduced by - 0.73 to -1.21%. The resultant dies from additional silicone monophase impressions had a percentage of variation for width 1.20% and height by-1.34%. The similar value for width and height for polyether was -1.46% and -1.30% respectively. Conclusion Putty reline technique dies had better dimensional accuracy after repeated pour followed by dies from heavy-light body additional silicone impression. Key message The multiple pour cast from putty reline elastomeric impressions is clinically acceptable, while cast from polyether was smaller in dimension. How to cite this article Haralur SB, Toman MS, Al-Shahrani AA, Al-Qarni AA. Dimensional Accuracy of Multiple Pour Cast from Different Elastomer Impression Techniques. Int J Prosthodont Restor Dent 2016;6(3):51-56.
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Taumaturgo, Vandre Mesquita, Lícia Camila Rocha Leal, Evamiris França Landim Vasques, Maria Daniela Balbino Silva, Edson Vaz Lima, and Taciana França Landim. "Use of silicones in fixed aesthetic rehabilitations: clinical case." ARCHIVES OF HEALTH INVESTIGATION 10, no. 5 (May 4, 2021): 777–82. http://dx.doi.org/10.21270/archi.v10i5.5066.
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Molding in a fixed prosthesis is one of the most important stages in rehabilitative treatment, as it is there that attempts are made to reproduce dental preparations and adjoining regions by using appropriate materials and techniques. Among the fixed prosthesis molding materials available on the market, the elastomers stand out, which are polymers where the prey occurs through the increase of the chain and the establishment of cross-links. The objective of the study is to present a clinical case and perform a literature review on the use of condensation silicone and addition to molds in Fixed Prosthesis. In this literature review, a survey of PubMed, Scielo and Lilacs data was performed, using the descriptors: Denture, Partial, Fixed; Dental Impression Materials and Elastomers. It is possible to conclude that in the field of Dentistry, the elastomers, among them the condensation-cured and addition-cured silicones, both provide high precision models and are the most used materials in works with fixed partial dentures. Therefore, it is up to the professional to know the properties and adapt to the best group of chosen materials.
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Naumovski, Borjan, and Biljana Kapushevska. "Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review." PRILOZI 38, no. 2 (September 1, 2017): 131–38. http://dx.doi.org/10.1515/prilozi-2017-0031.
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Abstract A quality-made dental impression is a prerequisite for successful fixed-prosthodontic fabrication and is directly dependent on the dimensional stability, accuracy and flexibility of the elastomeric impression materials, as well as on the appropriately used impression techniques. The purpose of this paper is to provide a literature review of relevant scientific papers which discuss the use of various silicone impression materials, different impression techniques and to evaluate their impact on the dimensional stability and accuracy of the obtained impressions. Scientific papers and studies were selected according to the materials used, the sample size, impression technique, storage time, type of measurements and use of spacer for the period between 2002 and 2016. In the reviewed literature several factors that influence the dimensional stability and accuracy of silicone impression molds, including the choice of the type of viscosity, impression material thickness, impression technique, retention of the impression material on the tray, storage time before the casting, number of castings, hydrophilicity of the material, release of byproducts, contraction after polymerization, thermal contraction and incomplete elastic recovery were presented. The literature review confirmed the lack of standardization of methodologies applied in the research and their great diversity. All findings point to the superiority of the addition silicone compared to the condensation silicone.
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Cervino, Gabriele, Luca Fiorillo, Alan Herford, Luigi Laino, Giuseppe Troiano, Giulia Amoroso, Salvatore Crimi, et al. "Alginate Materials and Dental Impression Technique: A Current State of the Art and Application to Dental Practice." Marine Drugs 17, no. 1 (December 29, 2018): 18. http://dx.doi.org/10.3390/md17010018.
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Hydrocolloids were the first elastic materials to be used in the dental field. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. With the removal of the impression, being particularly rich in water, the imprints can deform but later adapt to the original shape due to the elastic properties they possess. The advantages of using alginate include the low cost, a better tolerability on the part of the patient, the ease of manipulation, the short time needed for execution, the instrumentation and the very simple execution technique and possibility of detecting a detailed impression (even in the presence of undercuts) in a single step. A comprehensive review of the current literature was conducted according to the PRISMA guidelines by accessing the NCBI PubMed database. Authors conducted a search of articles in written in English published from 2008 to 2018. All the relevant studies were included in the search with respect to the characteristics and evolution of new marine derived materials. Much progress has been made in the search for new marine derived materials. Conventional impression materials are different, and especially with the advent of digital technology, they have been suffering from a decline in research attention over the last few years. However, this type of impression material, alginates (derived from marine algae), have the advantage of being among the most used in the dental medical field.
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Popoff, Daniela Araújo Veloso, Fabiana Santos Gonçalves, Wallace de Freitas Oliveira, Luiza Anjos Soares, Hugo Lemes Carlo, Adérito Soares da Mota, and Carlos Jose Soares. "Impression Materials and Storage Time Influence on Cast Models Accuracy." International Journal of Experimental Dental Science 2, no. 1 (2013): 18–23. http://dx.doi.org/10.5005/jp-journals-10029-1033.
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ABSTRACT Background There are a great amount of materials and techniques to use during dental prosthesis production that may confuse the dentist at the time of choice. Material's choice should be done considering ideal chemicophysical and biological properties and high detail reproduction. Aims The present study aimed to test the influence of differents impression materials and storage times on the dimensional accuracy of casting models. Materials and methods Four elastomeric materials– polysulfide, polyether, condensation silicone and addition silicone–were used to reproduce a master model of human teeth which were prepared for metaloceramic fixed prosthodontics. Six reference points were established on each tooth in order to determine four intervals: MD–mesial-distal, BL–buccal-lingual and CO–cervical-occlusal distance from premolar, and INT– interpillar distance–from the distal surface of the premolar to the mesial surface of the molar. The impressions were stored for half, 2 and 12 hours and pondered with a type IV gypsum. Results Cast measurements data were subjected to ANOVA (4 × 3), Tukey's – α = 0.05, Kruskal-Wallis and Dunn's tests – α = 0.05. The interaction between materials and storage time presented statistically significant for VP and CO intervals. For each storage time, materials presented dimensional alteration statistically significant. Conclusion Impression materials accuracy was affected by the storage time. All materials presented different dimensional accuracy when evaluated in a same period of time. Polysulfide was the only material that presented stable behavior over the time. How to cite this article Gonçalves FS, de Freitas Oliveira W, Soares LA, Carlo HL, da Mota AS, Popoff DAV, Soares CJ. Impression Materials and Storage Time Influence on Cast Models Accuracy. Int J Experiment Dent Sci 2013;2(1):18-23.
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Alani, Mathew M., PB Reba, Susan Mathew, KN Velayudhan Nair, Sayij Haridas, and Sherin A. Thomas. "Radiofrequency Glow Discharge as a Mode of Disinfection for Elastomeric Impression Materials." Journal of Contemporary Dental Practice 18, no. 2 (2017): 131–36. http://dx.doi.org/10.5005/jp-journals-10024-2003.
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ABSTRACT Introduction Prosthodontic practice involves procedures in which impressions of the maxillary and mandibular arches are mandatory. Cross infection is one of the major problems that can occur in regular dental practice. Every dentist should take utmost care to prevent cross infection as oral cavity is the source of variety of microorganisms which can often cause diseases that can be fatal. Although precautions, such as wearing of gloves and mask, sterilization of instruments are given importance, the need for disinfection of impressions is often neglected. Hence, the aim of the study was to assess the disinfection potential of radiofrequency glow discharge (RGD) by microbiological studies. Materials and methods Disinfection potential of RGD on addition silicone (Reprosil, Dentsply, Milford DE, USA) was assessed. Total sample size was 20. Samples were divided into two groups of 10 each. Group I – control group and group II – RGD-treated group. Main groups were subdivided into subgroups A and B. Data collected were analyzed. Results The RGD-treated samples were found to be culture sterile which meant that there were no signs of growth of any organisms, thus proving the disinfection potential of RGD. Conclusion From this study, we can conclude that RGD is a very rapid and handy device, which can disinfect saliva contaminated elastomeric impression material surfaces. Clinical significance When compared with the difficulties and lack of efficiency encountered in disinfecting impressions by immersion and spray atomization, RGD can be very handy in dental clinics, as it is a very rapid and convenient method for infection control. How to cite this article Mathew S, Alani MM, Nair KNV, Haridas S, Reba PB, Thomas SA. Radiofrequency Glow Discharge as a Mode of Disinfection for Elastomeric Impression Materials. J Contemp Dent Pract 2017;18(2):131-136.
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Costa, A. T. D., V. F. Passos, W. A. Morais, N. J. C. Sena, and R. G. L. A. Ferreira. "Efeitos de Diferentes Métodos de Desinfecção sobre a Estabilidade Dimensional dos Elastômeros para Moldagem." Journal of Health Sciences 19, no. 5 (February 23, 2018): 47. http://dx.doi.org/10.17921/2447-8938.2017v19n5p47.
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O objetivo deste estudo foi analisar a influência de diversos métodos de desinfecção na estabilidade dimensional de elastômeros para moldagem, por meio de uma revisão de literatura. Para isso realizou-se pesquisa nas bases de dados PubMed, Scielo e ScienceDirect, utilizando-se os seguintes descritores e estratégias de busca: “elastomers” AND “desinfection” AND “dental impression materials”. Foram recuperados 116 artigos em inglês e português e selecionados 10, adotando como critério de inclusão: estudos laboratoriais publicados de 2007 a 2017, que abordassem a relação entre alterações dimensionais dos elastômeros e métodos de desinfecção. Os estudos analisaram 12 procedimentos de desinfecção, utilizando diferentes tempos de imersão e exposição em siliconas de condensação, de adição e poliéteres. Os métodos averiguados foram: a utilização de glutaraldeído 2% cloreto de benzalcônio hipoclorito de sódio 5,25% micro-ondas sabonete neutro orftalaldeído 0,55% autoclave fitoterápicos clorexidina 4% álcool GL 70° raios ultravioleta e ácido paracético. Todos os métodos provocaram alguma alteração dimensional nos elastômeros, especialmente nas siliconas de condensação. A contração foi observada principalmente nos materiais desinfectados com glutaraldeído 2%, sobretudo após a primeira hora de separação molde-modelo, entretanto, esta não foi superior a 1%. Conclui-se que, apesar de provocarem alterações nas dimensões dos moldes de elastômeros, os desinfetantes podem e devem ser utilizados, sem prejuízos do ponto de vista clínico.Palavras-chave: Elastomers. Desinfection. Dental Impression Materials.
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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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Demir, Necla, Pınar Cevik, Yener Okutan, A. Nilgun Ozturk, and Bahar Colpan. "A different wax sculpture technique for implant-retained auricular prosthesis." European Journal of Dentistry 09, no. 03 (July 2015): 433–37. http://dx.doi.org/10.4103/1305-7456.163231.
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ABSTRACTReplacement of missing ears is a challenging task in which extensive array of materials and techniques have been employed. This article describes a different and simplified procedure for fabricating auricular prostheses very similar to the intact left ear of the patient. A 65-year-old male patient was referred to the Department of Prosthodontics with the loss of the right ear. In this case, the impression was made using hydrocolloid material (alginate) from the both defected and the opposite side. After hardening of the stone casts, a custom-made transparent splint plate was designed for the left auricular side. The splint was reversed and a cast model of the right auricular side was obtained as pouring the dental stone into transparent orthodontic splint. After getting the impression from cast model, conventional wax pattern and try on process was done. Finally, silicone elastomer was polymerized and the retention of the prosthesis acquired with the magnetic attachments. The technique described is economical, conventional, and time-saving. Furthermore, the prosthesis imitates the patient's intact auricular tissue.
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Salah A. Yousief, Khames T. Alzahrani, Suha M. Alhuwairini, Fai Y. Alharbi, Dalal A. Eissa, Sara M. Almojaddidi, Maha A. Almalki, et al. "The Effects of Chemical Disinfection on Dimensional Stability among Different Type of Impression Addition Silicon Materials." International Journal of Innovative Research in Medical Science 5, no. 12 (December 28, 2020): 645–49. http://dx.doi.org/10.23958/ijirms/vol05-i12/1029.
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Introduction: Saliva and blood contaminated impressions are often a source of cross contamination between the clinic and dental laboratory. Explicit communication and observance of an infection control protocol for handling of dental impressions must exist among the office staff as well as between office and dental laboratories. Though disinfection of impression is routinely followed, autoclaving elastomeric impression is an effective method of sterilization them. Objectives: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. Methods: In this study, a total of twenty impressions for the master model using heat resistant plastic stock trays. The twenty impressions were divided into two groups according to disinfection technique: (Table 2) Group 1: (n=10) Control group, untreated impressions. (C.G) Group 2: (n=10) Impressions were chemically disinfected. (D.G). after all impressions treatment, they were poured with extra hard stone (type IV) to get stone casts. Dimensional accuracy and detail reproduction of the impression material were evaluated indirectly through the recovered improved stone casts from impressions of the master model using the travelling microscope. Results: Cross arch distance (A): Epoxy resin master model cross arch distance measurement (A) was (41.36 mm). 1.1 Measurements of the cross-arch distance of stone casts Control group (C.G): The mean and standard deviation values of distance (A) in stone models obtained from C.G. were 41.553 ± 0.170 mm. Disinfection group (D.G): The mean and standard deviation values of distance (A) in stone models obtained from D.G were 41.368 ± 0.083 mm. ANOVA test showed that there was a statistically difference shrinkage between the groups (P-value = 0.006). 1.2 Measurement of the dimensional changes in the cross-arch distance of the different groups. The mean and standard deviation values of cross arch distance changes in stone models of C.G. were 0.191 ± 0.170 mm. while dimensional changes in stone models obtained from D.G. were 0.006 ± 0.082 mm. Conclusion: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. In this study an epoxy resin master model was duplicated from a modified dentate mandibular model. Within the limitations of this study, it could be concluded that Chemical disinfectant of polyvinyl siloxane impression material can be successfully used in making fixed partial dentures.
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Gradinaru, I., B.-I. Ciubotaru, M.-F. Zaltariov, and M. Cazacu. "Comparative Study on the Characteristics of Silicone Elastomers used in Dental Impression Techniques." IOP Conference Series: Materials Science and Engineering 877 (July 18, 2020): 012036. http://dx.doi.org/10.1088/1757-899x/877/1/012036.
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Craig, R. G. "Review of Dental Impression Materials." Advances in Dental Research 2, no. 1 (August 1988): 51–64. http://dx.doi.org/10.1177/08959374880020012001.
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Major advances in impression materials and their application have occurred during the last decade, with greater emphasis being placed on rubber impression materials than on dental compound, zinc oxide-eugenol, and agar and alginate. Of particular interest has been the effect of disinfection solutions on the qualities of impressions and the biocompatibility of impression materials. The principal advance in hydrocolloids has been the introduction of the agar/alginate impression technique, which has simplified the procedure and improved the quality of gypsum dies compared with those prepared in alginate impressions. The tear strength of some alginates has been improved, and some have been formulated so that the powder is dustless, thus reducing the health hazard as a result of patient inhalation of dust during the dispensing process. Polyether and silicone impression materials have been modified so that the working time, viscosity, and flexibility of the polyethers have been improved and, with the introduction of addition silicones, their accuracy has become exceptional. Although the early addition silicones liberated hydrogen after setting, thus delaying the pouring of models and dies, most addition silicones have been improved so that no hydrogen is released and dies can be poured immediately. The introduction of automatic mixing systems for addition silicones has simplified their manipulation, has reduced the number of voids in impressions, and has reduced the amount of material wasted. The incorporation of surfactants into addition silicones has made them hydrophilic, with wetting properties similar to those of polyethers, and has made pouring bubble-free gypsum dies easier. This review is confined to published and unpublished information of the past decade. It will also suggest trends that should be anticipated in the near future based on this information. The review will not present information developed before 1975, which is available in several textbooks on dental materials by Craig (1985a), Phillips (1982), and Williams and Cunningham (1979).
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Leow, M. E. L., and R. W. H. Pho. "RTV silicone elastomers in hand prosthetics: Properties, applications and techniques." Prosthetics and Orthotics International 23, no. 2 (August 1999): 169–73. http://dx.doi.org/10.3109/03093649909071629.
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In this technical note, an overview of RTV (room-temperature-vulcanising) silicone elastomers is provided. The properties and applications of 3 different types of RTV silicones in producing prostheses for the hand are discussed. Vinyl polysiloxanes are excellent silicone impression materials that offer the advantages of a rapid cure, near exact duplication of fine details and ease of removal of the cured impression without permanent deformation. RTV-2 dimethyl polysiloxanes are ideal for mould-making and fabricating prostheses given their favourable qualities that range from ease of pigmentation, adjustable consistency, manageable curing rate and accuracy in recording fine details in the liquid state to excellent stain-resistance, elasticity and biodurability in the vulcanised state. RTV-1 dimethyl polysiloxanes are self-curing, readyfor-use silicones that adhere adequately well to most substrates and are useful for extrinsic hue modifications and waterproofing of the prosthesis. The basic techniques for each of these applications are also discussed. The cure-inhibition of addition-curing RTV silicones by sulphur-, tin- and nitrogen-containing contaminants and its damaging consequence is highlighted. A compilation of known contaminating agents is provided so that prior contact with these objects can be avoided when working with addition-curing silicones. The precautionary measures to prevent the problem are also outlined.
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Kang, J. K., Yong Keun Lee, Kwang Mahn Kim, and Kyoung Nam Kim. "Effect of Glass Filler Content on Hydrophilic Addition Silicone Impression Materials in Dentistry." Key Engineering Materials 284-286 (April 2005): 909–12. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.909.
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Dental impression materials are used to register or reproduce the form and relationship of the teeth and oral tissues. They should not be torn when removing from the wet mouth after setting. Nowadays, silica is widely used as filler to overcome the low mechanical strength of the dental impression materials. The purpose of this study was to synthesize high strength glass in the system of MgO-CaO-Al2O3-SiO2 and investigate its usefulness according to ISO standard after mixing with addition silicone. Commercial products, Contrast, Examix, Express, and Perfect-F were selected as control group. When the prepared glass filler was introduced in addition silicone impression material, tear strength was drastically increased significantly than that of the control group, keeping the consistency. All experimental groups showed higher tear stength than that of control groups. As the amount of filler content increases, tear strength was increased. Strain in compression, recovery from deformation, and linear dimensional change were satisfied the ISO standard either all the experimental or control groups. Therefore, calcium-substituted magnesium aluminosilicate glass in the system of 12.5MgO-17.5CaO-20Al2O3-50SiO2 is expected the useful filler in the light body of addition silicone impression materials.
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Cerghizan, Diana, Kamel Earar, Mihaela Monica Scutariu, Alina Ramona Dimofte, Gina Paunita Grecu, and Kinga Janosi. "In vitro Study on the Dimensional Stability of Interocclusal Recording Materials." Materiale Plastice 54, no. 3 (September 30, 2017): 557–64. http://dx.doi.org/10.37358/mp.17.3.4895.
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The teeth are found in the alveolar processes of both the upper and lower jaw and they form the two maxillary and mandibular dental arches, the various relations of which support the performance of the dental apparatus functions, one of the most important of which is mastication. These relations are also known as interocclusal relations, among which the moments in which the dento-dental contacts (occlusal relations) play an important role. Maximum intercuspation (MI) is the most frequent mandibulo-cranial functional position with dento-dental contact. The vast majority of functional food incision and mastication cycles end in MI. The highest number of dento-dental contacts, and the largest possible stability and surface of these contacts are also achieved in MI. Given the relative easiness of determination, recording and transfer of the MI position, it is used in many clinical situations to report the models of the two arches. The interocclusal recording materials used in our study were seven silicones, six of which with addition reaction, five with special destination for interocclusal relation determination and a putty-like silicone normally used for dental arch impression - Elite HD and one condensation silicone used for impressions. The reason for choosing the last two materials was the fact that some practitioners frequently use putty-like impression silicone to determine interocclusal relations. According to the findings of the measurements shown in table 1, further to the initial impression process, at the time T0, satisfactory results were obtained both for addition silicones and for condensation silicones, Registrado X-tra being the only recording material which exhibited major deviation from the standard dimension (3 mm). As for the Optosil condensation silicone, we noted a significant increase of the thickness of the material starting with the first hour after impression and reaching considerable values on the 5th day, which were 0.3 mm higher than the standard value. Rigid addition silicones have the lowest dimensional stability; putty-like silicones are frequently used to record interocclusal relations for fixed prosthetics, which is wrong since they grow rapidly and this impedes on the space between the treated tooth and the opposite tooth, the result being a high restoration, which may determine premature contacts. Except for Optosil, which exhibited a continuous increase, most materials may be used to mount models in the simulator after 24 h.
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Guiraldo, Ricardo Danil, Eric Yudi Harada, Sandrine Bittencourt Berger, Flaviana Alves Dias, Danielle Gregorio, Lucia Gloria Diana Aguilar Pizzurno, Nayra Kawana Turini, and Murilo Baena Lopes. "Influence of expiration date on detail reproduction of dental elastomers." Research, Society and Development 10, no. 11 (September 2, 2021): e306101118837. http://dx.doi.org/10.33448/rsd-v10i11.18837.
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Elastomers are synthetic rubber materials formed by polymers, which are joined by a small number of cross-links that form a three-dimensional network. The aim of the current study was to compare the surface detail reproduction of polyvinyl siloxane and polyether-based elastomeric impression materials (2 years after their expiration date) to the ones that have not exceeded this period-of-time. Four groups comprising 5 samples, each (n = 5), were divided based on material (polyvinyl siloxane – Express and polyether – Impregum Soft) and expiration date (expired, or not). The manipulated material was placed on a tray in a way to fully cover its inner part. Later on, it was placed on a metal matrix presenting 20-, 50- and 75-μm lines. Molds were removed after polymerization and surface detail reproduction was measured in comparator microscope (Stereozoom Microscope), along the 20 μm line (25 mm in length), at 4x-magnification, in compliance with ISO 4823. Surface detail reproduction values were subjected to descriptive analysis - results were expressed in percentage (%). All groups presented 100% of surface detail reproduction, regardless of impression material or expiration date. Surface detail reproduction of the investigated materials was not influenced by the evaluated elastomers’ expiration date.
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Naumovski, Borjan, Jadranka Bundevska, and Biljana Kapusevska. "Comparison of double-phase impression technique in 1 step and 2 steps by evaluating dimensional stability and accuracy of condensation silicones." Macedonian Pharmaceutical Bulletin 63, no. 01 (2018): 55–61. http://dx.doi.org/10.33320/maced.pharm.bull.2017.63.01.006.
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The diverse viscosities of silicone impression materials are suited for their use in various impression techniques, intended to improve the precision of the cast impression in the form of a plaster model. The purpose of this research is to determine the dimensional stability and accuracy of the double-phase impression technique in 1 step and 2 steps by using a condensation silicone impression material. This research was carried out by using a precise stainless-steel master model and an individual aluminum tray. Comparing the abutments of the master model and the abutments of the double-phase impression technique in 2 steps, showed that they are wider on average 81 µm, while the abutments from the double-phase impression technique in 1 step are on average 281 µm wider in diameter. After analyzing the results obtained in relation to the diameter of the abutments, it can be concluded that the double-phase impression technique in 2 steps is dimensionally more stable and accurate compared to the double-phase impression technique in 1 step. This study shows that dimensional stability and accuracy of impression materials also depend on the selection of appropriate impression technique and proper performance in order to obtain a high quality dental impression that will be the basis for an accurate fixed-prosthodontic fabrication. Keywords: silicone impression material, impression technique, fixed partial dentures, dimensional stability and accuracy
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Hussein, Farouk Ahmed. "Advances in Soft Denture Liners: An Update." Journal of Contemporary Dental Practice 16, no. 4 (2015): 314–18. http://dx.doi.org/10.5005/jp-journals-10024-1682.
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ABSTRACT Soft denture liners are used in complete and partial removable dentures to distribute functional loads homogeneously on the denture-bearing tissues. These materials are recommended in cases of irregular bone resorption, bony undercuts, thin atrophic mucosa, immediate prosthesis, healing after implant placement, and for patients with bruxism and xerostomia. The resilient lining materials can be categorized as plasticized acrylic resins or silicone elastomers. The plasticized acrylic resin comprises of acrylic polymers and copolymers, a liquid containing an acrylic monomer and plasticisers, such as ethyl alcohol and/or ethyl acetate responsible for preserving the material softness. The silicone elastomers, consisting of dimethylsiloxane polymers, with a chemical composition similar to that of the silicone impression materials devoid of leachable plasticisers, retain their elastic properties for prolonged periods. Most of the currently available materials have several disadvantages, including color stability, long-term resiliency, abrasion resistance, bond strength and porosity. Several modifications have been done recently to overcome of these disadvantages of the soft liners. The current review summarizes the recent developments in soft liners. How to cite this article Hashem MI. Advances in Soft Denture Liners: An Update. J Contemp Dent Pract 2015;16(4):314-318.
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Rippe, Marília Pivetta, Elen Guerra, Arianne Vallim Pinto Coelho, Lilian Costa Anami, Renata Marques de Melo Marinho, Marco Antonio Bottino, and Luiz Felipe Valandro. "Effect of different impression methods and ceramic materials on adaptation of inlays." Brazilian Dental Science 21, no. 3 (August 1, 2018): 296. http://dx.doi.org/10.14295/bds.2018.v21i3.1543.
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<p><strong>Objective:</strong> The aim of this study was to evaluate the internal and marginal adaptation of inlays fabricated from different types of impressions (conventional and digital) and different ceramics (feldspathic and lithium disilicate). <strong>Material and Methods:</strong> Forty premolars were prepared for all-ceramic inlay restoration and assigned to 4 groups (n=10), according to the impression method (conventional with addition silicone and digital impressions) and ceramic type (lithium disilicate and feldspathic ceramic blocks). For each type of impression, 10 inlays were fabricated from lithium disilicate blocks and the other 10 from feldspathic ceramic blocks, by means of the CAD-CAM system. The internal adaptation was analyzed by replica. The marginal fit was analyzed under a stereomicroscope by directly measuring the gap formed between the inlay and the tooth in the proximal and occlusal regions. <strong>Results:</strong> The marginal or internal adaptations were not affected by type of impression (conventional = digital impression), irrespective of the ceramic type. Only the internal adaptation was affected by material, i.e., feldspathic ceramic had lower values than disilicate ceramic, when considering the digital impression. <strong>Conclusion:</strong> The conventional and digital impressions promote similar marginal and internal adaptation of tested feldspathic and disilicate ceramic inlays. For digital impression the feldspathic ceramic showed better internal adaptation than lithium disilicate. </p><p><strong>Keywords</strong></p><p>Ceramics; Dental internal adaptation; Dental marginal adaptation; Dental impression technique.</p>
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Silva, Sávio Marcelo Leite Moreira da, and Milton Carlos Gonçalves Salvador. "Effect of the disinfection technique on the linear dimensional stability of dental impression materials." Journal of Applied Oral Science 12, no. 3 (September 2004): 244–49. http://dx.doi.org/10.1590/s1678-77572004000300016.
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The purpose of this study was to evaluate the dimensional stability of heavy and light bodied condensation silicones after immersion in disinfectant solution for 10 or 20 minutes. The impression materials were Optosil Comfort and Xantopren VL Plus and the disinfectant solutions were 1% sodium hypochlorite and 2% glutaraldehyde. Impressions were made on a perforated stainless steel tray, according to the American Dental Association specification No. 19, adding up to a total of 50 samples. The double mixing method (one time, two viscosities) was used. Impressions were removed from the roulette block after 7 minutes to ensure complete curing and then immersed in the solutions. Impressions not submitted to treatment composed the control group. After these steps, the impressions were removed from the solution, rinsed in running water and air-dried. Three-dimensional measurements were calculated using an optic microscope graduated at 0.001 mm. The two-way ANOVA indicated no differences (p>0.05) for any combination between variables. The results showed that the solution studied can be safely used to disinfect condensation silicone in clinical prosthodontic procedures.
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Ilchenko, M. O., and N. M. Dydyk. "EXPERIMENTAL STUDY OF EXOTERMIC EFFECTS INSIDE DENTAL PULP CHAMBER WHEN APPLYING DIRECT TECHNIQUE OF MANUFACTURING TEMPORARY CROWN." Актуальні проблеми сучасної медицини: Вісник Української медичної стоматологічної академії 21, no. 2 (June 17, 2021): 103–6. http://dx.doi.org/10.31718/2077-1096.21.2.103.
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The aim of this study is to determine the optimal combination of self-curing resins and type of matrix that provides a minimal temperature increase in the pulp chamber during the fabrication of temporary crowns. Material and methods. We designed as experimental model of direct temporary crown fabrication for extracted and than prepared molars. Intrapulpal temperature rise was measured in vitro conditions during polymerization of Protemp II (3M), Protemp 4 (3M), Visalis Temp (Kettenbach), Structur (Voco) and Carbodent (Stoma). Output and peak temperature findings of self-curing resin polymerization were recorded and values of temperature increase in the tooth chamber were calculated. Two types of materials were used to make external anatomical moulds: 1) silicone impression material Panasil Putty Soft of high and low viscosity and Panasil initial contact Light (Kettenbach) to make two-phase impression; 2) transparent thermoplastic polymer Erkodur (Erkodent), sheet of 1.0 mm thick, vacuum pressed. Results and Discussion. We obtained the following finding of the temperature rise inside the pulp chamber (polymer pattern / silicone matrix): Protemp IV (2,2˚C / 0,2˚C), VisalisTemp (3˚C / 0.3˚C), Protemp II (3,3˚C / 0,5˚C), Structur (3,4˚С/0,6˚С), Karbodent (6.7˚C / 3.0˚C). Conclusions. Exothermic effects during intra oral fabrication of temporary crowns can be minimized by polymerization of resins in the silicone mould as this material can absorb and dissipate heat.
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Nandini, Yamini, KB Vinitha, and M. Smitha. "Comparison of Dimensional Accuracy of Four Different Die Materials before and after Disinfection of the Impression: An in vitro Study." Journal of Contemporary Dental Practice 14, no. 4 (2013): 668–74. http://dx.doi.org/10.5005/jp-journals-10024-1383.
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ABSTRACT Background This study was conducted to compare the linear dimensional accuracy of die materials before and after disinfection of the impression. Type IV and V conventional dental stone, type IV-resin impregnated and copper-plated die materials were studied. Materials and methods A stainless-steel master die analogs to a complete veneer crown preparation with three scribed lines (I: vertical, II and III: horizontal) was machined and measurements were made from these scribed reference lines. Impressions were made with monophase addition silicone impression material for each of the specimens. 2% glutaraldehyde was used as a disinfectant. The fabricated dies were measured to the nearest 0.0001 mm. ANOVA and post hoc was carried out using Scheffe multiple comparison test at significance level of 0.05. Results Type IV resin-impregnated dental stone and copperplated dies approximated the dimensions of the master die. Type IV and V conventional dental stone dies showed greater variation in measurements. Statistically significant differences were observed for type IV resin-impregnated and copper-plated dies in dimension I and III. For dimension II no significant differences were found for dies fabricated from four die materials. A one-way analysis of variance indicated no statistical significant differences among the two groups of dies fabricated from disinfectant treated impressions and those fabricated from nondisinfectant treated impressions. Conclusion Type IV resin-impregnated dental stone and copper-plated dies are dimensionally more accurate than type IV and V conventional dental stone die materials. No significant linear distortion in the dies fabricated from the disinfected impressions was observed. How to cite this article Nandini Y, Vinitha KB, Manvi S, Smitha M. Comparison of Dimensional Accuracy of Four Different Die Materials before and after Disinfection of the Impression: An in vitro Study. J Contemp Dent Pract 2013;14(4):668-674.
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Nizami, Md Minhaz Ul Islam, Ahmed Mushfiqur Rahman, Nafij Bin Jamayet, Mohammad Khursheed Alam, Zuryati Ab Ghani, and Adam Husein. "Prosthetic rehabilitation of a microtia patient by adhesive retained auricular prosthesis: A dental technique." Bangladesh Journal of Medical Science 18, no. 2 (March 25, 2019): 437–39. http://dx.doi.org/10.3329/bjms.v18i2.40723.
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Introduction: Auricular deformity can be emotionally traumatising and affects social behavior of an individual. In such cases, aesthetically acceptable prosthesis serves as a viable alternative technique to surgical reconstruction.
Case description: Impression of the auricular defect was taken by light and regular body of poly vinyl siloxane impression material. Wax sculpting was challenging due to the bulgy remnant of the defected ear. The wax pattern was made very thin to accommodate and mask the remnant without compromising the aesthetic. Trial on the patientwas done for correction of the contours, angulation, height and width according to the normal contralateral ear. The intrinsic coloration of a Room Temperature Vulcanizing silicone was done and poured in a custom-made three-piece mold. Before the final issue of the auricular prosthesis, extrinsic coloration was done based on the surrounding area of the defect.
Discussion: Fabrication of adhesive retained prosthesis is challenging in patients with large deformed soft tissue who refuse to undergo surgical repair. A modified wax sculpting was done to overcome this challenge. Medical grade silicone was the choice of material because of its flexibility, biocompatibility and life like appearance.
Conclusion: Replacement of missing ear is a difficult and multi-step task in which extensive array of materials and techniques need to be employed. This fabrication technique is alternative to surgical repair with the utilization of available and economical materials.
Bangladesh Journal of Medical Science Vol.18(2) 2019 p.437-439
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Pritam, Amrita, and Nivedita Mall. "An In-Vitro Evaluation of the influence of repeat pours of addition silicone impressions on the dimensional accuracy of resultant casts: an original research study." UNIVERSITY JOURNAL OF DENTAL SCIENCES 6, no. 2 (September 7, 2020): 33–38. http://dx.doi.org/10.21276/ujds.2020.6.2.17.
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Background and Aim: For miscellaneous purposes, the prosthodontists and dental laboratory technicians usually attempt repeated pouring of the impression in order to avoid expenses and curb upon the chair-side time. There are numerous factors which can affect dimensions of subsequent casts on repeated pouring. These include the process of polymerization, temperature and the material used to fabricate the replica of working cast. The sole aim of this study was to evaluate if repeated pouring of addition silicone impression would influence the dimensional accuracy of resultant casts. Materials & Methods: Addition silicone impression material along with tray adhesive were used to evaluate the influence of repeat pours on the dimensional accuracy of resultant casts at various time intervals i.e. at 15 minutes, 75 minutes, 24 hours and 7 days. Vision measurement machine was used for measurement of dimensions. A metal control model of 8*6*2 cm was made with abutments. Various dimensional markings and measurements (for inter-abutment distance & intra-abutment distance) were completed. All 80 resultant casts were along with the master model was dimensionally evaluated with “Vision Measurement Machine”. Statistical Analysis and Results: Statistical analysis was completed by SPSS (statistical package for social sciences) version 21.0 and Epi-info version 3.0. The result of this study showed that working dies obtained from Addition silicone at various time intervals i.e. 15 minutes, 75 minutes, 24 hours and 7 days exhibited insignificant dimension changes clinically. The p-value was taken significant when less than 0.05 (p<0.05) and Confidence interval of 95% was taken. Post-Hoc Bonferroni test showed no significant difference for the inter-interval comparison of mean inter-abutment distance (Line 2-3). Conclusion: Within the limitations of the study authors concluded that the addition silicone impression material could be preferred material in the field of prosthodontics for repeated pouring up-to 7 days due to its favorable qualities like dimensional accuracy and stability, elastic recovery from undercuts, low creep and moderate to high tear resistance.
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Wieckiewicz, Mieszko, Natalia Grychowska, Marek Zietek, and Wlodzimierz Wieckiewicz. "Evaluation of the Elastic Properties of Thirteen Silicone Interocclusal Recording Materials." BioMed Research International 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/7456046.
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Background.Addition silicones are popular as dental impression materials and are used in bite registration procedures.Objective.This study aimed to compare the postsetting elasticities and other mechanical properties of thirteen addition silicone interocclusal recording materials.Materials and Methods.The following materials were investigated: Colorbite D, Futar D, Genie Bite, Jet Blue Bite fast, Memoreg 2, O-Bite, Occlufast Rock, Omni-Bite Plus, Regidur i, Registrado X-tra, Regofix transparent, StoneBite, and Variotime Bite. Thirty specimens of each material were tested. The elasticities and strengths of the materials were measured with a universal testing machine, and computer software was used to determine theE-moduli, ultimate tensile strengths, and ultimate elongations of the specimens.Results.The results were subjected to statistical analysis using the Kruskal-Wallis test (p≤0.05). The statistics revealed that the meanE-modulus values varied significantly across the materials (p=0.000) and were highest for the StoneBite and Registrado X-tra and lowest for the Regofix transparent. The ultimate tensile strengths were highest for the Regofix transparent and Registrado X-tra (p=0.000) and lowest for the Jet Blue Bite fast and Memoreg 2 (p=0.000). The elongation percentages at the point of breaking varied significantly across the materials (p=0.000); the lowest value was observed for the StoneBite, whereas the Regofix transparent nearly doubled original length.Conclusions.The authors concluded that materials with the highE-moduli and great ultimate tensile strengths may be most useful clinically. Registrado X-tra and StoneBite best met these criteria.
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Tonetto, Mateus Rodrigues, Daher Antonio Queiroz, Marcelo Massaroni Peçanha, Ana Christina Claro Neves, Fausto Frizzera, and Laís Regiane Silva-Concílio. "Influence of Disinfection with Peracetic Acid and Hypochlorite in Dimensional Alterations of Casts obtained from Addition Silicone and Polyether Impressions." Journal of Contemporary Dental Practice 14, no. 6 (2013): 1100–1105. http://dx.doi.org/10.5005/jp-journals-10024-1458.
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ABSTRACT Dental impressions disinfection is important to reduce the risk of cross contamination but this process may produce dimensional distortions. Peracetic acid is a disinfectant agent with several favorable characteristics yet underutilized in Dentistry. The aim of this paper is to compare the dimensional stability of casts obtained from addition silicone and polyether impressions that were immersed for 10 minutes in a solution of 0.2% peracetic acid or 1% sodium hypochlorite. Sixty samples in type IV gypsum were produced after a master cast that simulated a full crown preparation of a maxillary premolar. Samples were divided in 6 groups (n = 10) according to the impression material and disinfection agent: Group AC – addition silicone control (without disinfectant); Group APA – addition silicone + 0.2% peracetic acid; Group AH – addition silicone + 1% sodium hypochlorite; Group PC – polyether control (without disinfectant); Group PPA – polyether + 0.2% peracetic acid; Group PH – polyether + 1% sodium hypochlorite. Cast height, base and top diameter were measured and a mean value was obtained for each sample and group all data was statistically analyzed (ANOVA, p < 0.05). There was not a significant statistical difference between addition silicone and polyether impressions regardless of the disinfectant materials. It can be concluded that disinfection with the proposed agents did not produce significant alterations of the impressions and the peracetic acid could be considered a reliable material to disinfect dental molds. How to cite this article Queiroz DA, Peçanha MM, Neves ACC, Frizzera F, Tonetto MR, Silva-Concílio LR. Influence of Disinfection with Peracetic Acid and Hypochlorite in Dimensional Alterations of Casts obtained from Addition Silicone and Polyether Impressions. J Contemp Dent Pract 2013;14(6):1100-1105.
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Mahmood, Riham N., Neamat H. Abu-bakr, Nada M. Sanhouri, and Yahia E. Ibrahim. "Quality of Final Impressions and Prescriptions for Fixed Prosthodontics." International Journal of Prosthodontics and Restorative Dentistry 3, no. 3 (2013): 87–91. http://dx.doi.org/10.5005/jp-journals-10019-1083.
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ABSTRACT Purpose The purpose of this study was to investigate the quality of final impressions and prescriptions for fixed restorations that were received by private and educational institute's laboratories in Sudan. Materials and methods Two hundred and seventeen questionnaires were distributed to eight private laboratories and seven dental schools in Sudan. The questionnaires were filled by the dental technicians and who were trained and instructed to complete one questionnaire per one final impression for fixed restoration immediately after it was received. Results Total response rate was 87%; the responding technicians had found evidence of obvious contamination in 23.8% of the examined impressions; blood was clear in 68.9% of these cases. Metal stock trays were used in 57.1% of the examined sample. About two-third of the impressions had been taken using condensation silicone (64.6%). Poor or no written instructions were observed in half of the sample (n = 103). Conclusion According to results of this study there was widespread use of inappropriate impression materials; the cross-infection control of sent impressions was below standard and there were poor prescriptions and communications with laboratory technicians in Sudan. How to cite this article Mahmood RN, Abu-bakr NH, Sanhouri NM, Ibrahim YE. Quality of Final Impressions and Prescriptions for Fixed Prosthodontics. Int J Prosthodont Restor Dent 2013;3(3):87-91.
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Brunton, Paul A., Jithendra Ratnayake, Carolina Loch, Arthi Veerasamy, Peter Cathro, and Robert Lee. "Indirect Restorations and Fixed Prosthodontics: Materials and Techniques Used by General Dentists of New Zealand." International Journal of Dentistry 2019 (January 10, 2019): 1–6. http://dx.doi.org/10.1155/2019/5210162.
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Background. To investigate the selection and use of materials and techniques for core buildup, indirect restorations, and fixed prosthodontics by general dentists in New Zealand. Methods. A questionnaire comprising 19 sections and 125 questions was distributed via mail to 351 general dentists in New Zealand who were selected from the Dental Council of New Zealand’s 2016 register. Results. The majority of the respondents (68.8%) reported using resin composite light-cured materials for the core buildup of vital posterior teeth. A large number of respondents (52%) did not use dentine pins, with the majority of them (25%) being recent graduates (<10 years). Fibre posts were used by 61.6% of the dentists surveyed. The majority of dentists (54.6%) reported using addition-cured silicone impression material for crown and bridge impressions. Glass-ionomer cements (37.5% of participants) and resin-modified glass-ionomer cements (35.8%) were the most common luting cements used. Direct resin composite veneers were the preferred material of choice rather than indirect restoration of anterior teeth (40.4%). Conclusions. The study showed that New Zealand dentists surveyed are using current state-of-the-art materials and techniques, with their choice of material being greatly influenced by clinical indications and patients aesthetic demands.
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Carvalhal, Cintia Iara Oda, José Antônio Nunes de Mello, Lourenço Correr Sobrinho, Américo Bertolazzo Correr, and Mário Alexandre Coelho Sinhoreti. "Dimensional Change of Elastomeric Materials after Immersion in Disinfectant Solutions for Different Times." Journal of Contemporary Dental Practice 12, no. 4 (2011): 252–58. http://dx.doi.org/10.5005/jp-journals-10024-1043.
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ABSTRACT Aim The aim of this study was to evaluate the influence of immersion period in two disinfectant solutions on dimensional change of four elastomeric impression materials. Materials and methods Four representative materials of each class of elastomers: Xantopren (polydimethylsiloxane—PDS), Express (polyvinyl siloxane—PVS); Permlastic (polysulfide— PS) and Soft Impregum (polyether—EP) were mixed according to manufacturers’ instructions and then inserted into a metal matrix prepared according to the specification of ISO 4823. The molds were removed from the matrix after 7 minutes and immersed in disinfectant solutions (sodium hypochlorite 0.5 and 2% glutaraldehyde) for 5, 10, 20, 30 and 60 minutes (n = 7), except the control group, which was not immersed. Once removed from solutions, the test samples were washed in water for 15 seconds, dried and measured three times, using a comparative optical microscope, with accuracy of 0.0005 mm. The analysis of variance with three criteria and Tukey's test with significance level of 5% showed that differences in linear dimensions of the materials analyzed were not statistically significant (p > 0.05) after soaking in sodium hypochlorite 0.5 and 2% glutaraldehyde, for the tested periods of time. Clinical significance Combinations of molding material and disinfecting solution can be used in the dental clinic for infection control, without changing the dimensional molds, for immersion periods not longer than 20 minutes. How to cite this article Carvalhal CIO, de Mello JAN, Sobrinho LC, Correr AB, Sinhoreti MAC. Dimensional Change of Elastomeric Materials after Immersion in Disinfectant Solutions for Different Times. J Contemp Dent Pract 2011;12(4): 252-258.
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Al-Odinee, Nusaiba M., Mohsen Al-Hamzi, Ibrahim Z. Al-shami, Ahmed Madfa, Abdulwahab I. Al-Kholani, and Yazeed M. Al-Olofi. "Evaluation of the quality of fixed prosthesis impressions in private laboratories in a sample from Yemen." BMC Oral Health 20, no. 1 (November 4, 2020). http://dx.doi.org/10.1186/s12903-020-01294-1.
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Abstract Background Fixed prosthodontics require an accurate impression for the teeth and the area to be restored for the laboratory to fabricate the desired restoration without mistakes. This study evaluated the quality of impressions received by private laboratories for the fabrication of fixed prosthesis by describing the frequency of clinically detectable errors and by analyzing association between the various factors involved. Methods 165 impressions were collected from four dental laboratories. Jaw involved, type of tray, size of tray, number of prepared units, type of impression materials, techniques and viscosity in case of elastomeric impressions and type of prosthesis requested were recorded. Data referring to errors and visible defects including errors in finish line, in preparation area, in silicone impression technique and blood in impression were also documented. Factors affecting errors present were also assessed. Association between dentist gender and experience years and impression errors was assessed. Chi square and Fisher exact tests used to examine the association between categorical variables and outcomes. Results The total of error considering not immediately pouring as an error. Alginate was the most impression used. of impressions evaluated (50.9%), 97% were have at least one visible error; 92.1% had errors in finish line, 53.9% had errors in preparation area and (72.8%) of elastomeric impressions were have at least one error in technique. Blood in impression was detected in 52.1% of impressions. Significant association was found between material type and errors in finishing line and preparation area. Significant relationships were found between gender and errors in silicone impression technique (p < 0.05). Conclusion Within the limitations of this study, high frequency of detectable errors was found in fixed prosthesis impressions received by private dental laboratories. This high frequency is of serious concern, as this will result in poor fitted fixed prosthesis provided to patients.
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Kandi, Nikita, Ajay Sabane, and Abhijit Patil. "Evaluation of the Vertical Marginal Fit of CAD-CAM Zirconia, Pressable Lithium Disilicate, CAD-CAM Cobalt Chromium and Direct Metal Laser Sintered Cobalt Chromium Copings- An Invitro Comparative Analysis." JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2020. http://dx.doi.org/10.7860/jcdr/2020/44354.13872.
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Introduction: The longevity, durability and success of conventional fixed partial dentures and single crowns have been known to be attributed to the marginal fit of these restorations. Therefore, many studies lay emphasis on accurate marginal fit of the crowns. It has been the focus of various investigations in literature. However, there is limited literature comparing marginal accuracy CAD/CAM zirconia, Pressable Lithium Disilicate, CAD/CAM Cobalt-Chromium and Direct Metal Laser Sintered (DMLS) copings. Aim: Verification and comparative evaluation of the vertical marginal adaptation of CAD/CAM Zirconia, Pressable lithium Disilicate, CAD/CAM Cobalt-Chromium and DMLS copings. Materials and Methods: This invitro study was planned with an aim to evaluate the vertical marginal adaptation of CAD/CAM Zirconia, Pressable Lithium Disilicate, CAD/CAM Cobalt-Chromium and DMLS copings. A custom- made metal master model was prepared simulating the shape and dimension of tooth preparation resembling a first premolar using a Computer Numerically Controlled (CNC) milling machine. An elastomeric impression of the custom-made stainless steel model was made with addition silicone using dual mix/double step technique. All impressions were poured in Type IV dental stone and 60 stone dies were obtained. The samples were divided into four groups and each group had 15 samples (stone dies)- CAD/CAM zirconia (Group A), Pressable Lithium Disilicate (Group B), CAD/CAM Cobalt Chromium (Group C), and Direct Metal Laser Sintered Cobalt Chromium copings (Group D). The marginal fit was analysed at four reference marks on the working die stone model i.e., 0° (Buccal surface), 90° (Mesial Surface), 180° (Lingual surface), and 270° (Distal surface) on the stone die using a stereomicroscope. Comparison between groups was done by using one-way ANOVA test followed by a Post-Hoc Tukey-Kramer multiple comparisons test. Results: The mean marginal gap (in μm) for Group A was 53.185±25.83, respectively. The mean marginal gap (in μm) of Group B was 66.08±22.27, respectively. The mean marginal gap (in μm) of Group C was 108.62±23.93, respectively. The mean marginal gap (in μm) of Group D was 28.54±13.53, respectively. Tukey’s post-hoc analysis showed that the mean difference in the vertical marginal gap in Group C and the other three groups was statistically significant (p<0.05) i.e., marginal discrepancy of group C was more than Group A, Group B and Group D. Conclusion: The marginal fit of DMLS copings is more accurate as compared to CAD/CAM Zirconia, Pressable Lithium Disilicate and CAD/CAM Cobalt-Chromium copings.
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Silva, Lorena Scaioni, Gustavo Porangaba Miranda, Aljomar José Vechiato-Filho, Fellippo Ramos Verri, and Victor Eduardo De Souza Batista. "Confecção de moldeira individual pela clonagem da prótese total provisória do paciente: relato de caso clínico." ARCHIVES OF HEALTH INVESTIGATION 8, no. 11 (June 4, 2020). http://dx.doi.org/10.21270/archi.v8i11.4395.
Full textAbstract:
O objetivo do presente artigo foi relatar uma forma de confecção de prótese total utilizando a clonagem da prótese provisória com a finalidade de reduzir as etapas do tratamento. Paciente desdentada total superior e classe I de Kennedy inferior compareceu ao consultório apresentando inflamação severa do tecido periodontal, mobilidade grau III de todos os dentes e supuração à sondagem. Optou-se por realizar prótese total superior convencional e realização das exodontias dos dentes remanescentes, seguida de prótese total provisória e como tratamento definitivo mandibular uma prótese total convencional. Na primeira sessão foi realizada a reavaliação dos tecidos bucais, moldagem da prótese total superior para obter o modelo antagonista, seleção da cor do dente, registro para montagem no articulador semi-ajustável e a clonagem da prótese total inferior provisória. Após polimerizada, a réplica em resina acrílica incolor foi ajustada em boca e realizada a moldagem de borda com godiva em bastão, seguida da moldagem funcional com silicone de condensação. Ambos modelos foram montados no articulador para montagem dos dentes artificiais. A prova estética e funcional foi realizada na segunda consulta e na terceira a prótese foi instalada junto com as instruções de uso e higiene oral. Os controles foram realizados após 24 horas, 3, 7 e 14 dias. O uso de uma técnica alternativa para confecção de uma moldeira individual pode reduzir o tempo clinico, trazendo assim vantagens tanto para o paciente como para o profissional, desde que haja um bom planejamento e conhecimento da técnica.Descritores: Prótese Total; Técnica de Moldagem Odontológica; Materiais para Moldagem Odontológica.ReferênciasEmami E, Souza RF, Kabawat M, Feine JS. The impact of edentulism on oral and general health. Int J Dent. 2013;2013:498305Williams SE, Slice DE. Influence of edentulism on human orbit and zygomatic arch shape. Clin anat. 2014;27(3):408-16.Brasil. Ministério da Saúde. Projeto SB Brasil 2010: Brasil Sorridente - A saúde bucal levada a sério. Brasília: Ministério da Saúde; 2010.Petersen PE. The World Oral Health Report 2003: continuous improvement of oral health in the 21st century – the approach of the WHO Global Oral Health Programme. Community Dent Oral Epidemiol. 2003;31(Suppl 1):3-23.Agostinho ACMG, Campos ML, Silveira JLGC. Edentulismo, uso de prótese e autopercepção de saúde bucal entre idosos. Rev odontol UNESP. 2015; 44(2):74-9.Di Fiori SR, Di Fiori M, Di Fiori AP. Atlas de prótese parcial removível. São Paulo: Santos; 2010.Telles D. Prótese total: convencional e sobre implantes. São Paulo: Santos; 2011.Carlsson GE, Omar R. The future of complete dentures in oral rehabilitation. A critical review. J Oral Rehabil. 2010;37(2):143-56.Mericske-Stern RD, Taylor TD, Belser U. Management of the edentulous patient. Clin Oral Implants Res. 2000;11(1):108-25.Telles D, Coelho AB. Próteses sobre implantes. Rio de Janeiro: SobreImplantes.com; 2006.Calvani L, Michalakis K, Hirayama H. The influence of full-arch implant-retained fixed dental prostheses on upper lip support and lower facial esthetics: preliminary clinical observations. Eur J Esthet Dent. 2007;2(4):420-28.Cooper LF. The current and future treatment of edentulism. J Prosthodont. 2009;18(2):116-22Thomason JM, Lund JP, Chehade A, Feine JS. Patient satisfaction with mandibular implant overdenture and conventional denture 6 months after delivery. Int J Prosthodont. 2003;16(5):467-73.Silva-Junior MF, Fonseca EP, Batista MJ, Sousa MLR. Spatial distribuition of tooth loss in a population of adults. RGO. 2017;65(2):115-20.Ettinger RL. Managing and treating the atrophic mandible. J Am Dent Assoc. 1993;124(7):234-41Lindquist TJ, Narhi TO, Ettinger RL. Denture duplication technique with alternative materials. J Prosthet Dent. 1997;77(1):97-8.Barros AWP, Porto E, Lima JFS, Brito NMSO, Soares RSC. Steps for biomodel acquisition through addtive manufacturing for health. RGO. 2016;64(4):442-6.Watamabe Y. Observation of horizontal mandibular positions in an edentulous patient using a digital gothic arch tracer: a clinical report. J Prosthet Dent. 2004;91(1):15-9.Williamson RA, Williamson AE, Bowley J, Toothaker R. Maximizing mandibular prosthesis stability utilizing linear occlusion, occlusal plane selection, and centric recording. J Prosthodont. 2004;13(1):55-61.Paixão F, Silva WAB, Silva FA, Ramos GG, Cruz MVJ. Evaluation of the reproducibility of two techniques used to determine and record centric relation in Angle's class I patients. J Appl Oral Sci. 2007;15(4):275-79.Duncan JP, Taylor TD. Simplified complete dentures. Dent Clin North Am. 2004; 48(3):25-40.Nascimento DFF, Patto RBL, Marchini L, Cunha VPP. Double-nlind study for evaluation of complete dentures made by two techniques with and without face-bow. Braz J Oral Sci. 2004;3(9):439-45.Kawai Y, Murakami H, Takanashi Y, Lund JP, Feine JS. Efficient resource use in simplified complete denture fabrication. J Prosthodont. 2010;19(7):512-16.Heydecke G, Vogeler M, Wolkewitz M, Türp JC, Strub JR. Simplified versus comprehensive fabrication of complete dentures: patient ratings of denture satisfaction from a randomized crossover trial. Quintessence Int. 2008;39(2):107-16.Duncan JP, Taylor TD. Teaching an abbreviated impression technique for complete dentures in an undergraduate dental curriculum. J Prosthet Dent. 2001;85(2):121-25.Heydecke G, Akkad AS, Wolkewitz M, Vogeler M, Türp JC, Strub JR. Patient ratings of chewing ability from a randomised crossover trial: lingualised vs. first premolar/canine-guided occlusion for complete dentures. Gerodontology. 2007;24(2):77-86.Ansari IH. A one-appointment impression and centric relation record technique for compromised complete denture patients. J Prosthet Dent. 1997;78(3):320-23.Davis DM, Watson RM. A retrospective study comparing duplication and conventionally made complete dentures for a group of elderly people. Br Dent J. 1993;175(2):57-60.Clark RfK. The future of teaching of complete denture construction to undergraduates. Br Dent J. 2002;193(1):13-4.Ellis JS, Pelekis ND, Thomason JM. Conventional rehabilitation of edentulous patients: the impact on oral health-related quality of life and patient satisfaction. J Prosthodont. 2007;16(1):37-42.Rodrigues AHC, Morgano SM. An expedited technique for remaking a single complete denture for an edentulous patient. J Prosthet Dent. 2007;98(3):232-34.Tamaki T. Dentaduras completas, 4. ed. São Paulo: Sarvier; 1983.Reis JMSN, Perez LECP, Nogueira S, Ariolli Filho JN, Moll Júnior FA. Moldagem em prótese total: uma revisão de literatura. RFO. 2007;12(1):70-4.Bonachela WC, Rosseti PHO. Overdentures: das raízes implantadas osseointegrados - planejamentos, tendências e inovações. São Paulo: Santos; 2002.Telles D. Prótese total - convencional e sobre implantes. 2. ed. São Paulo: Santos; 2010.Felton DA, Cooper LF, Scurria MS. Predictable impression procedures for complete dentures. Dent Clin North Am. 1996; 40(1):39-51.Lee RE. Mucostatics. Dent Clin North Am. 1980; 24(1):81-96.DeFranco RL, Sallustio A. An impression procedure for the severely atrophied mandibule. J Prosthet Dent. 1995;73(6):574-77.Tripathi A, Singh SV, Aggarwal H, Gupta A. Effect of mucostatic and selective pressure impression techniques on residual ridge resorption in individuals with different bone mineral densities: A prospective clinical pilot study. J Prosthet Dent. 2019;121(1):90-4.Levin BL. Impressions for complete dentures. Chicago: Quintessence; 1984.Turano JC, Turano LM. Consertos e Reembasamentos. Fundamentos da prótese total, 7.ed. São Paulo: Santos; 2004.Caputi S, Murmura G, Ricci L, Varvara G, Sinjari B. Immediate denture fabrication: a clinical report. Ann Stomatol (Roma). 2013;4(3-4):273-77.Seals Jr RR, Kuebker WA, Stewart KL. Immediate complete dentures. Dent Clin North Am. 1996; 40(1):151-67.Cerveira Neto H. Prótese total imediata. 2. ed. São Paulo: Pancast Editorial; 1987.Marchini L, Santos JFF, Cunha VPP. Prótese total imediata: considerações clínicas. Robrac. 2000;9(27):45-9.Wagner AG. Making duplicate dentures for use as final impression trays. J Prosthet Dent. 1970;24(1):111-13.Anusavice KJ. Phillips: materiais dentários. 10.ed. Rio de Janeiro: Guanabara Koogan;1998.Elie E. Daou. The elastomers for complete denture impression: a review of the literature. Saudi Dent J. 2010;22(4):153-60.Goldfogel M, Harvey WL, Winter D.Dimensional change of acrylic resin tray materials. J Prosthet Dent. 1985;54(2):284-86.Pagniano RP, Scheid RC, Clowson RL, Dagefoerde RO, Zardiackas LD. 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Kinra, Manish Sen. "To Evaluate the Effect of Storage Temperature on the Linear Dimensional Accuracy of Delayed and Repeat Pours of Two Addition Silicone Impression Materials." Journal of Advances in Medicine and Medical Research, November 6, 2019, 1–20. http://dx.doi.org/10.9734/jammr/2019/v30i1130250.
Full textAbstract:
Background: Addition silicone elastomers are the most commonly used impression materials for making final impression for fpd, implants and rpd. The dimensional stability and accuracy of addition silicone impression material are influenced by the storage time, temperature and repeat pour.
Aim and Objectives: To evaluate the accuracy of two different types of addition silicone elastomeric impression materials, stored at a different temperature. To evaluate the accuracy of two different types of addition silicone elastomeric impression materials, after delayed and repeated pour. To compare the linear dimensions of two different types of addition silicone elastomeric impression materials with a control die.
Materials and Methods: A machined standard steel master die and metal custom impression tray was made for making a final impression of machined standard steel master die. Final impression was made by using two different brands of addition silicone impression materials (Aquasil Ultra Impression material, Dentsply/ Caulk, Milford, D & 3M ESPE). Double step putty light body impression technique was used for making final impression. In this manner total numbers of 80 impressions were made and they were divided into two groups Group I and Group II. To study the effect of delayed pours and storage temperature were divided into 4 sub-groups, 10 impressions each. All the ten impressions of each sub groups were stored at 40°C in acrylizer, 24 hours at -10°C, 48 hours at -2°C and 1 week respectively at 0°C inside a refrigerator in a sealed plastic bags before been poured with type IV die stone. To study the effect of repeat pours on the accuracy of stone casts, all ten impressions of each sub groups was immediately re poured with type IV die stone after the removal of first set of casts. Thus again a fresh set of 80 cats were obtained having 40 casts belongs to each group.
Results: When impressions were stored at 40°C in acrylizer, 24 hours at -10°C, 48 hours at -2°C and 1 week respectively at 0°C addition silicone impression materials did not show any significant change when compared to control samples.
Conclusion: Both types of addition silicone elastomeric impression materials maintained their accuracy after delayed poured and repeat pours. Storing impressions under different conditions caused no adverse effect upon the accuracy of both types of addition silicone elastomeric impression materials. There was no significant change in the dimensions of stone casts obtained from both impression materials as compared to the dimensions of a master die. If addition silicone impression material is delayed pour up to 1 week, repeat pour and exposed from -10°C to 40°C in that clinical situation also linear dimensional accuracy will not be adversely effected.
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Shreya, S., and Ramesh P. Nayakar. "Knowledge, Attitude, and Practices Regarding Maxillofacial Defects and their Prosthetic Rehabilitation among Dental Undergraduate Students in Belagavi District- A Cross-sectional Study." JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2020. http://dx.doi.org/10.7860/jcdr/2020/46236.14243.
Full textAbstract:
Introduction: Maxillofacial defects are facial disfigurements resulting from congenital abnormalities, surgical resection of tumours, trauma, or a combination of these. The resulting deformity often leads to a difficult path of recovery with lifelong consequences, causing both physical disability and mental distress. Prosthetic rehabilitation is not only a solution to cover the physical deficit, but also a way to improve function as well as the quality of life for such patients. However, the knowledge amongst undergraduate dental health professionals about the same has been at sparse. Aim: To evaluate the knowledge, attitude, and practices regarding maxillofacial defects and their prosthetic rehabilitation amongst dental undergraduate students. Materials and Methods: A cross-sectional survey was conducted between January 2020 and June 2020, amidst the third year, fourth year undergraduate students, and interns of Belagavi city, Karnataka, India. The data was collected using a 16-item custom designed proforma, comprising of questions evaluating student’s basic knowledge about the diagnosis, treatment procedures, and treatment planning of maxillofacial defects and their prosthetic rehabilitation. Statistical analysis was done using Chi-square test in each group, using SPSS version 22 p-value <0.05 to be considered significant. Results: A total of 286 participants answered the questionnaire, of which 117 (40.9%) were interns, 116 (40.6%) were third year students, and 53 (18.5%) were fourth year students. 279 (97.6%) participants had an understanding regarding maxillofacial defects. Of those who had witnessed cases, only 18.2% had observed more than three cases (p-value <0.001). Out of respondents with treatment understanding, 184 (64.3%) answered that it required a multidisciplinary approach (p-value <0.001). 197 (68.9%) of the respondents felt that silicone was the most commonly used material (p<0.003). 165 (57.7%) answered that waxes were the most commonly used impression material (p-value <0.001). Out of the respondents awared about treatment modalities, 120 (42%) respondents majority answered that CAD-CAM would contribute the most to maxillofacial rehabilitation. Conclusion: Comprehensive understanding and clinical application of prosthodontic rehabilitation of maxillofacial defects among undergraduate students was found to be lacking. This awareness should be initiated at an early stage of the clinical training for undergraduate training programme, as it will help to understand the basic aspects involved in the prosthodontic rehabilitation of maxillofacial defects.