Objective: The aim of this finite elemental stress analysis study was to evaluate the effect of hybrid layer on distribution and amount of stress formed under occlusal loading in a premolar tooth restored with composite or ceramic inlay. Methods: Mandibular premolar tooth was selected as the model based on the anatomical measurements suggested by Wheeler. The analysis is performed by using a Pentium II IBM compatible computer, using the SAP 2000 structural analysis program. 4 different mathematical models including the following structures were evaluated: 1-Ceramic inlay, adhesive resin and tooth structure, 2- Ceramic inlay, adhesive resin, hybrid layer and tooth structure, 3- Composite inlay, adhesive resin and tooth structure, 4- Composite inlay, adhesive resin, hybrid layer and tooth structure. Loading was applied from occlusal surface of the restoration and shear stresses under loading were evaluated. The findings were drawn by Saplot program and the results were analysed by graphical comparison method. Results: The output indicated that hybrid layer act as a stress absorber in Model 2 and 4. Hybrid layer has also changed mathematical values of stress on cavity floors in both restoration types. Ceramic inlay collected the stress inside the body of the material but composite inlay directly transferred the stress through dental tissues. Conclusion: As a result it was concluded that hybrid layer has an effect on stress distribution under loading in a premolar tooth model restored with composite or ceramic inlay.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the 81st General Session of the International Association for Dental Research (June 25-28, 2003)

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