A Comparative Evaluation of Compressive Resistance and Surface Hardness of Two Elastomeric Interocclusal Recording Materials: An In Vitro Study
Vidya S Bhat, Shifas Hameed, Sanha Razdan, Sanath Shetty
Keywords :
Bite registration, Compressive resistance, Hardness, Interocclusal record material
Citation Information :
Bhat VS, Hameed S, Razdan S, Shetty S. A Comparative Evaluation of Compressive Resistance and Surface Hardness of Two Elastomeric Interocclusal Recording Materials: An In Vitro Study. CODS J Dent 2022; 14 (2):33-39.
Aim: This study was conducted to compare and evaluate the compressive resistance at varying thicknesses and surface hardness of Exabite II and Ramitec interocclusal recording materials.
Materials and methods: In the present study, the compressive resistance and the surface hardness of Exabite II and Ramitec were studied when subjected to a constant compressive load. Various thicknesses of the interocclusal recording materials were selected. As standard cylindrical stainless steel dies with an internal diameter of 10 mm and three different heights of 2, 3, and 4 mm, a metal plate, and a metal base were prepared, fabricating 80 specimens for the study. A universal testing machine (UTI) was used and subjected to a constant compressive force of 25 N and Shore A hardness tester at 1 and 72 hrs time intervals to test the compressive resistance and surface hardness, respectively.
Results: The 2 mm thickness specimens showed the least compression, and the 4 mm thickness specimen showed maximum compression under a constant load of 25 N for both the materials tested. The independent t-test (p ≤ 0.05) indicated a significant difference in surface hardness between the materials at different time intervals. Both materials possessed higher surface hardness at 72 hours than at 1 hour.
Conclusion: The compressive resistance of both materials was inversely proportional to the thickness of the sample. This implies that the minimum thickness of the recording materials should be used for recording maxillomandibular relations without sacrificing the strength of the interocclusal record.
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