Farklı laminate veneer yapım tekniklerinin in vitro olarak mikrosızıntı açısından ve sonlu elemanlar stres analiz yöntemi ile stres dağılımı yönünden değerlendirilmesi

Abstract

122 SUMMARY IV VITRO STUDY OF MICROLEAKAGE OF DIFFERENT LAMINATE VENEER TECHNIQUES AND EVALUATION OF STRESS DISTRIBUTION BY FINITE ELEMENTS ANALYSIS METHODS. In this study, it was decided to evaluate and compare the rate of microleakage and stress distribution of composite and porcelain laminate veneers that have two different ending points. In order to achieve microleakage studies, 63 recently extracted, permanent maxiller central incisors were used. The samples were divided into 8 randomly choosen groups. In the first group composite leminate veneers were applied to 7 teeth without any preparation and restoration were ended on enamel, just above the cemento-enamel junction. In second group composite laminate veneer restoration were ended on cementum, 1 mm apicaly to the cemento-enamel jnction. In third group, the preparation were applied and composite laminate veneer restoration were ended on enamel, just above the cemento-enamel junction. In fourth group, The same preparations were applied composite laminete veneer restorations were ended on cementum, 1 mm apicaly to cemento- enamel junction. In the fifth group porcelain leminate veneers were applied to 7 teeth without any preparation and restoration were ended on enamel, just above the cemento-enamel junction.123 In sixth group porcelain laminate veneer restoration were ended on cementum, 1 mm apicaly to the cemento-enamel jnction. In seventh group, the preparation were applied and porcelain laminate veneer restoration were ended on enamel, just above the cemento-enamel junction. In eighth group, The same preparations were applied porcelain laminete veneer restorations were ended on cementum, 1 mm apicaly to cemento- enamel junction. By using dye penetration technique, microleakage test was applied to teeth and microleakage evaluations were performed on four different junctions(incisaly and cervicaly) by the photograps taken from polarized light microscope. The result of Kruskall-Wallis varience analysis showed that restorations ended on enamel have less microleakage than the ones on cement. Also the teeth-resin interface distributed more microleakage than the resin-restoration interface. While detecting different materials, it was conclued that porcelain groups have less microleakege scores than the composite groups. In the second part of this study, in order to examine the stress created by the functional forces on maxillary central incisors, SAP 90 programme was used. The control group was added to the microleakage sample groups in order to have a mathematical model and tha analysis were performed on this model. The result of stress distribution figures were drawn by using SAPLOT drawing programme. Ar the end of analysis laminate veneer applications were found more effective then the natural teeth for reducing the stress. As a material, porcelain has more adequate result than the composite. Key word: laminate veneer, porcelain, composite, microleakage, stress analysis.

122 SUMMARY IV VITRO STUDY OF MICROLEAKAGE OF DIFFERENT LAMINATE VENEER TECHNIQUES AND EVALUATION OF STRESS DISTRIBUTION BY FINITE ELEMENTS ANALYSIS METHODS. In this study, it was decided to evaluate and compare the rate of microleakage and stress distribution of composite and porcelain laminate veneers that have two different ending points. In order to achieve microleakage studies, 63 recently extracted, permanent maxiller central incisors were used. The samples were divided into 8 randomly choosen groups. In the first group composite leminate veneers were applied to 7 teeth without any preparation and restoration were ended on enamel, just above the cemento-enamel junction. In second group composite laminate veneer restoration were ended on cementum, 1 mm apicaly to the cemento-enamel jnction. In third group, the preparation were applied and composite laminate veneer restoration were ended on enamel, just above the cemento-enamel junction. In fourth group, The same preparations were applied composite laminete veneer restorations were ended on cementum, 1 mm apicaly to cemento- enamel junction. In the fifth group porcelain leminate veneers were applied to 7 teeth without any preparation and restoration were ended on enamel, just above the cemento-enamel junction.123 In sixth group porcelain laminate veneer restoration were ended on cementum, 1 mm apicaly to the cemento-enamel jnction. In seventh group, the preparation were applied and porcelain laminate veneer restoration were ended on enamel, just above the cemento-enamel junction. In eighth group, The same preparations were applied porcelain laminete veneer restorations were ended on cementum, 1 mm apicaly to cemento- enamel junction. By using dye penetration technique, microleakage test was applied to teeth and microleakage evaluations were performed on four different junctions(incisaly and cervicaly) by the photograps taken from polarized light microscope. The result of Kruskall-Wallis varience analysis showed that restorations ended on enamel have less microleakage than the ones on cement. Also the teeth-resin interface distributed more microleakage than the resin-restoration interface. While detecting different materials, it was conclued that porcelain groups have less microleakege scores than the composite groups. In the second part of this study, in order to examine the stress created by the functional forces on maxillary central incisors, SAP 90 programme was used. The control group was added to the microleakage sample groups in order to have a mathematical model and tha analysis were performed on this model. The result of stress distribution figures were drawn by using SAPLOT drawing programme. Ar the end of analysis laminate veneer applications were found more effective then the natural teeth for reducing the stress. As a material, porcelain has more adequate result than the composite. Key word: laminate veneer, porcelain, composite, microleakage, stress analysis.