Accuracy of one-step versus two-step putty wash addition silicone impression technique

Hung, Shirley H.; Purk, John H.; Tira, Daniel E.; Eick, J. David

doi:10.1016/0022-3913(92)90151-y

Cited by 94 publications

(98 citation statements)

References 9 publications

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“…On the other hand, differences were noticed between the impression techniques when addition silicone was used and a conclusion is however drawn that the double-phase 1-step impression is more accurate than the double-phase 2-step impression. These results are in favor of the findings in the study of Hung et al [19] where a comparison of the double-phase technique in 1-step and 2-steps is done by using addition silicones, which confirmed that the double-phase 1-step technique is more precise than the double-phase 2-step technique.…”

Section: Discussionsupporting

confidence: 42%

“…The metal on metal contact is achieved by finger pressure on the tray. The study examines the accuracy of four (one double-phase 1-step and three double-phase 2-step with spacer) impression techniques because some authors [19] argue that there is no difference between them, while other criticize the double-phase 1-step technique [23,24]. Their criticism is underpinned by the lack of control over the amount of light body silicone and the risk of recording the prepared marginal edge by the heavy body silicone, which is inadequate for detailed reproduction.…”

Section: Discussionmentioning

confidence: 99%

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Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

Naumovski

Kapushevska

2017

Prilozi

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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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Section: Discussionsupporting

confidence: 42%

Section: Discussionmentioning

confidence: 99%

Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

Naumovski

Kapushevska

2017

Prilozi

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“…However, in this study, the dimensional accuracy of a partially edentulous mandibular arch is related more to the type of impression material than the impression technique 7,[16][17] . The 2-step putty/light-body technique was initially developed to decrease the problems of polymerization shrinkage for condensation silicones 18 . Therefore, this technique is also recommended for polyvinyl siloxanes to promote better dimensional stability.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, this technique is also recommended for polyvinyl siloxanes to promote better dimensional stability. 5,18 The controversial findings in previous investigations regarding impression techniques may be explained partly by the different protocols and materials used, such as the presence or absence of adhesive on the trays 10 . It is known that polymerization shrinkage occurs toward the center of the mold, resulting in negative linear variation (shrinkage) in the stone casts 23 .…”

Section: Discussionmentioning

confidence: 99%

“…Several studies showing differences in dimensional accuracy between the impression techniques are found in literature [8][9][10][11][12][13][14][15] . Conversely, other studies show similar outcomes between different impression techniques 7,[16][17] or only small differences within a specific group of elastomeric impression materials 18 . Therefore, there is conflicting evidence on impression techniques.…”

Section: Introductionmentioning

confidence: 92%

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Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

Vitti

Feitosa

Bacchi

et al. 2017

RGO, Rev. Gaúch. Odontol.

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ObjectiveThe purpose of this in vitro study was to assess and compare the dimensional accuracy of three impression techniques: 1-step putty/light-body, 2-step putty/light-body, and the monophase technique. Methods A partially edentulous standard stainless steel mandibular arch cast with reference points on the teeth was used to make the impressions. The anteroposterior and transverse distances were measured. All impressions were made with a polyvinyl siloxane using stock metallic (1-and 2-step putty/light-body techniques) or acrylic resin (monophase technique) trays. The monophase impressions were made using a light-body material and the 1-and 2-step putty/light-body impressions with putty and light-body materials. After impression procedures, the accuracy of each technique was assessed measuring the stone casts (n = 5) poured from the impressions using a microscope at 30x magnification and at 0.5 µm accuracy. The data were analyzed statistically using 2-way ANOVA and Tukey's test (p<0.05). Results Stone casts made by all techniques had significantly negative linear changes (shrinkage). The anteroposterior distances showed more dimensional changes than the transverse distances. The edentulous side showed more shrinkage than the anteroposterior side. ConclusionNo differences between the impression techniques were found, but significant dimensional changes were observed.

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Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions

et al. 2015

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Accuracy of one-step versus two-step putty wash addition silicone impression technique

Cited by 94 publications

References 9 publications

Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions

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