Introduction -The fabrication of dental prosthesis requires the transfer of interocclusal records from patientís mouth to semi- adjustable articulators using different kinds of recording media. Any inaccuracy in these interocclusal records leads to occlusal errors in the final prosthesis. The fabrication of an immaculate prosthesis requires that the articulator should simulate the patientís mandibular movements as closely as possible. These articulators require interocclusal records for mounting casts and programming articulators.
Method - In this in vitro study, the linear dimensional change and compressive resistance of four commercially available elastomeric interocclusal recording media was tested. In this study , A aluminium cylinder of internal diameter of 20 mm and 20 mm height were fabricated according to manufacturer instructions. Total 40 specimens are fabricated. Materials used were polyvinyl silicones and modelling wax. 20 specimens of each materials were fabricated. Cylindrical samples of 20mm diameter of each material were prepared. The linear dimensional changes of the samples were evaluated after 24 hours of fabrication. The compressive resistance was measured when each of these was subjected to a constant compressive load of 25 Newtons in universal testing apparatus.
Result: There was notable difference between all interocclusal bite registration materials. According to the mean valve of each interocclusal bite registration material, Polyvinylsiloxane Bite Registration Material have better resistance to compression than as compared to, Modeling Wax.
Conclusion: Polyvinylsiloxane interocclusal registration material had the greatest resistance to compression as compared to modelling wax because of its low dimensional stability.
Key words: Polyvinylsiloxane, dimensional stability, interocclusal bite