Comparative evaluation of tear resistance of two rubber base bite registration pastes: An in-vitro study

Abstract

Introduction: Any alteration in the interocclusal recording material before mounting the cast on the articulator would lead to change in maxillomandibular relationship, causing improper restoration with defective occlusal contacts. For an accurate replication, the interocclusal recording material must not deform or tear while being removed from oral cavity. Among various interocclusal record materials available, two recently introduced elastomeric bite registration pastes namely polyether and addition silicone are gaining popularity. Aims and Objectives: Since no much study are available regarding the tear resistance of bite registration materials, the present study was conducted to evaluate and compare the tear strength of polyether and addition silicone bite registration pastes. Materials and Method: Twenty specimens each of polyether and addition silicone bite registration pastes were made using metallic die according to dimensions as in ASTN D624 Type C mould. Tear resistance of both the materials were measured using Shimadzu Autograph Universal testing machine. The values obtained were tabulated and analysed statistically. Results and Conclusion: The mean tear resistance for polyether was 4.4456 N/mm and that for addition silicone bite registration pastes was 3.4943 N/mm. The tear resistance of polyether bite registration paste is significantly higher than the tear resistance of addition silicone bite registration paste. As the p value obtained was 0.000 (p value < 0.05) the result obtained is statistically significant.