Joshua Ng Chor Yang1, James David Raj2, Herald Sherlin3. 1. Student, Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals , Chennai, India . 2. Senior Lecturer, Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals , Chennai, India . 3. Reader, Department of Oral and Maxillofacial Pathology, Saveetha Dental College and Hospitals , Chennai, India .
Abstract
INTRODUCTION: Resin composites have been the pinnacle of direct esthetic restorations ever since its discovery. However, it comes with its own disadvantages. Post-operative sensitivity and marginal discoloration frequently occur due to polymerization shrinkage and micro leakage, which is the major cause of failure in resin composite restorations. AIM: To evaluate the effects of preheated composite at different temperatures on microleakage. MATERIALS AND METHODS: A total of 60 extracted non-carious human premolars were collected and class 1 cavity (1.5x4x 3mm) was prepared in each and were randomly divided into three groups. Group 1 (n=20) was filled with microhybrid resin composite (Heraeus Charisma Smile) at room temperature. Group 2 (n=20) was filled with the same resin composite which was preheated to 50°C and Group 3 (n=20) was filled with resin composite preheated to 60°C. Teeth were subjected to a thermocycling regime (500X, 5 - 55°C), followed by a dye infiltration by immersing in basic fuschin for 24 hours. The tooth was sectioned longitudinally and the extent or absence of micro-leakage was determined by the amount of dye penetration along the resin composite-tooth interface using a confocal microscope. RESULTS: There was minor micro-leakage detected at the occlusal margin of the control tooth specimen. The sample with preheated composite restoration at 50°C showed an intact tooth-restoration interface with no micro leakage. However, the preheated composite at 60°C showed large amount of microleakage. CONCLUSION: Under the current limitation of the study, preheated composite at 50°C showed the least micro-leakage.
INTRODUCTION: Resin composites have been the pinnacle of direct esthetic restorations ever since its discovery. However, it comes with its own disadvantages. Post-operative sensitivity and marginal discoloration frequently occur due to polymerization shrinkage and micro leakage, which is the major cause of failure in resin composite restorations. AIM: To evaluate the effects of preheated composite at different temperatures on microleakage. MATERIALS AND METHODS: A total of 60 extracted non-carious human premolars were collected and class 1 cavity (1.5x4x 3mm) was prepared in each and were randomly divided into three groups. Group 1 (n=20) was filled with microhybrid resin composite (Heraeus Charisma Smile) at room temperature. Group 2 (n=20) was filled with the same resin composite which was preheated to 50°C and Group 3 (n=20) was filled with resin composite preheated to 60°C. Teeth were subjected to a thermocycling regime (500X, 5 - 55°C), followed by a dye infiltration by immersing in basic fuschin for 24 hours. The tooth was sectioned longitudinally and the extent or absence of micro-leakage was determined by the amount of dye penetration along the resin composite-tooth interface using a confocal microscope. RESULTS: There was minor micro-leakage detected at the occlusal margin of the control tooth specimen. The sample with preheated composite restoration at 50°C showed an intact tooth-restoration interface with no micro leakage. However, the preheated composite at 60°C showed large amount of microleakage. CONCLUSION: Under the current limitation of the study, preheated composite at 50°C showed the least micro-leakage.
Entities:
Keywords:
Bonding; Class 1 restoration; Marginal integrity; Microhybrid composite
Authors: Warren C Wagner; Mert N Aksu; Mert N Asku; Ann-Marie L Neme; Jackson B Linger; Frank E Pink; Stephen Walker Journal: Oper Dent Date: 2008 Jan-Feb Impact factor: 2.440