Effect of tray space on the accuracy of monophasic polyvinylsiloxane impressions

Tjan, Anthony H.L.; Nemetz, Harold; Nguyen, Lan Thi; Contino, Raymond

doi:10.1016/0022-3913(92)90278-i

Cited by 38 publications

(38 citation statements)

References 16 publications

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“…The percentage of deviation for multimix techniques for interpreparation distance was 0.008% and for monophasic was 0.599%. The similar change in accuracy of monophasic material was also reported by Tjan et al, [29] and from the clinical perspective, these deviations in the inter preparation distance from master model are not of sufficient magnitude to cause difficulty, when the inherent elasticity of the relevant intraoral tissues is considered.…”

Section: Discussionsupporting

confidence: 54%

“…Interest has grown in a new group of impression materials called addition silicones since they have shown to be accurate and dimensionally stable [24][25][26].Tray selection is the first step to start with the impression making. A custom tray is required to minimise the effects of polymerization shrinkage, loss of reaction by-products and deformation associated with tray seating and removal [27][28][29]. The next step involves the selection and use of the preferred viscosity for making an impression.…”

Section: Discussionmentioning

confidence: 99%

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A Comparison of Dimensional Accuracy of Addition Silicone of Different Consistencies with Two Different Spacer Designs - In-vitro Study

Rathee

Eswaran

et al. 2014

JCDR

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Introduction: Dimensional accuracy of impression materials is crucial for the production of working casts in Fixed Prosthodontics. The accurate replication of tooth preparations and their arch position requires impression materials that exhibit limited distortion. Methods:This study was conducted to comparatively evaluate the dimensional accuracy of additional silicones by comparing two different techniques and spacer designs, by measuring the linear changes in interpreparation distance. The impressions were made from a stainless steel master die simulating a three unit bridge. A total 80 die stone (type IV, Ultrarock) models were obtained from the impressions made using two different parameters. The two different parameters are Multimix and Monophasic technique and different spacer designs. Result:The interpreparation distance of the abutments in the casts was measured using a travelling microscope. Each sample was measured thrice and the mean value was calculated. The results obtained were statistically analysed and the values fall within the clinically acceptable range.

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

A Comparison of Dimensional Accuracy of Addition Silicone of Different Consistencies with Two Different Spacer Designs - In-vitro Study

Rathee

Eswaran

et al. 2014

JCDR

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“…The improved physical properties of m o d e rn elastomers and particularly polyviny l siloxanes have diminished this concern and now the use of stock trays for impressions has become common practice for reasons of cost and convenience. 26 Common stock trays made of polystyrene or chromium plated brass are reported to be suitably stiff to prevent flexure or distortion, although there remains some possibility of tray wall flexure with polystyrene trays. 27 Wassell and Ibbetson 14 and Payne and Pereira 28 identified poor fitting stock trays and consequent tray wall flexure as the greatest concern for inaccuracy.…”

Section: Impression Trays and Adhesivesmentioning

confidence: 99%

Polyvinyl siloxane impression materials: An update on clinical use

Mandikos

1998

Australian Dental Journal

160

115

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Polyvinyl siloxane impression materials have applications in a variety of indirect procedures in p r o s t h o d o n t i c s and restorative dentistry. Favourable handling properties, good patient acceptance and excellent physical properties have resulted in their popularity in today's practice. In this review, the chemistry and important physical properties of polyvinyl siloxanes are summarized, and recent clinical questions of improved hydrophilics, tray adhesives, disinfection, and glove-induced polymerization inhibition are addressed.

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“…However, it was found that there was increased distortion in the interpreparation distance and size of the individual abutments, in impression made with these materials. 6 This inaccuracy of monophasic material can be explained as the bulk of the single viscosity material which may have more polymerization shrinkage than a bulk of heavy body materials that have higher filler contents. …”

Section: Discussionmentioning

confidence: 99%

Dimensional accuracy of two rubber base impression materials as a function of spacer design and techniques in custom trays for fixed partial dentures

Kaushik

Dhiman

Kumar

2015

Medical Journal Armed Forces India

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a b s t r a c tBackground: A prostheses can't be better than the cast over which it has been fabricated. To make accurate casts, accurate impressions are mandatory. To get an accurate and dimensionally stable impression, various techniques and materials have been advocated. This study compares the most commonly used techniques and materials for dimensional accuracy. Two types of spacers were designed to compare the addition silicon and polyether and their techniques. Methods: A metal die was used to make the impressions. A total of 60 impressions were made using multiple mix and monophasic techniques for addition silicon and polyether in custom trays. A travelling microscope was used to measure the dimensional accuracy of die stone casts retrieved from impressions. Results: The results were compared using paired t test and SPSS software. The study was highly significant ( p < 0.001). The polyether was more accurate than the addition silicon and spacer design I (adapted to the edentulous area) was more accurate than the design II (spacer over the abutments, not adapted to edentulous area). The multiple mix technique was more accurate than the monophasic for addition silicon. Conclusion: The combination of multiple mix technique with spacer design I for addition silicon gave the best accurate results.ª 2013, Armed Forces Medical Services (AFMS). All rights reserved.

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Effect of tray space on the accuracy of monophasic polyvinylsiloxane impressions

Cited by 38 publications

References 16 publications

A Comparison of Dimensional Accuracy of Addition Silicone of Different Consistencies with Two Different Spacer Designs - In-vitro Study

A Comparison of Dimensional Accuracy of Addition Silicone of Different Consistencies with Two Different Spacer Designs - In-vitro Study

Polyvinyl siloxane impression materials: An update on clinical use

Dimensional accuracy of two rubber base impression materials as a function of spacer design and techniques in custom trays for fixed partial dentures

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