Accuracy of Casts Produced from Seven Rubber Impression Materials

Sawyer, H.F.; Birtles, Jack T.; Neiman, Robert; Podshadley, Arlon G.

doi:10.14219/jada.archive.1973.0348

Cited by 25 publications

(3 citation statements)

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“…When die stone slurries were used to wet specimens for contact angle measurements, the size of the slurry drop (water/powder ratio) presumably affects the rheology of the slurry and cause variations in the contact angle analysis. 4 To eliminate the effect of these variables, equal sized drops of saturated calcium sulfate dihydrate solution was used in this investigation. 4 The time of contact angle measurement in this study was arbitrarily selected to be 1 minute.…”

Section: Discussionmentioning

confidence: 99%

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A Comparative Study to Determine the Wettability and Castability of Different Elastomeric Impression Materials

Gv¹,

Ns²,

Itttigi³

et al. 2012

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to determine the wettability of different hydrophilic and hydrophobic elastomeric impression materials and the gypsum castability. Materials and methods:The wettability was evaluated by determining the contact angles of different elastomeric impression materials. The contact angle was determined by placing a drop of aqueous solution of calcium sulfate dihydrate on the flat surface of impression material and specimens were measured using a profile projector.Gypsum castability was determined by counting the number of voids formed in the die stone cast made from the impressions of a aluminum die. The voids were counted using an diopter magnifying lens. Results:Polyether, different viscosities of polyvinyl siloxane, and condensation silicone impression materials exhibited low contact angle values and least number of voids in the die stone cast when compared with polysulfide impression material. Conclusion:There was significant correlation between the contact angle and voids formed in the die stone casts when fabricating die stone casts from various elastomeric impression material impressions.Clinical significance: Accurate reproduction of prepared tooth or edentulous arch is of clinical importance in the fabrication of a fixed or removable prosthesis. Inaccuracies in the replication processes will ultimately have an adverse effect on the fit and adaptation of final restoration. The interaction is determined in part by hydrophilic and hydrophobic nature of the elastomeric impression material. Inadequate wetting of an impression results in voids in the stone casts.

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Section: Discussionmentioning

confidence: 99%

“…4 To eliminate the effect of these variables, equal sized drops of saturated calcium sulfate dihydrate solution was used in this investigation. 4 The time of contact angle measurement in this study was arbitrarily selected to be 1 minute. The advancing contact angle was used to facilitate accurate and consistent measurements.…”

Section: Discussionmentioning

confidence: 99%

A Comparative Study to Determine the Wettability and Castability of Different Elastomeric Impression Materials

Gv¹,

Ns²,

Itttigi³

et al. 2012

The Journal of Contemporary Dental Practice

View full text Add to dashboard Cite

show abstract

“…Polyethers and addition silicones have been used for many years as impression materials and have gained popularity because of their excellent accuracy, dimensional stability, and quick recovery 8–15 . These impression materials have been modified with the addition of plasticizers and fillers in order to be used as interocclusal recording media.…”

mentioning

confidence: 99%