Journal of Clinical and Diagnostic Research, ISSN - 0973 - 709X

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Original article / research
Table of Contents - Year : 2016 | Month : June | Volume : 10 | Issue : 6 | Page : ZC36 - ZC38

Effects of Preheated Composite on Micro leakage-An in-vitro Study ZC36-ZC38

Joshua Ng Chor Yang, James David Raj, Herald Sherlin

Dr. Joshua Ng Chor Yang,
Boys Hostel, Saveetha Dental College and Hospitals, 162,Poonamallee Highroad Vellapanchavadi, Chennai, Tamilnadu, India.

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 50C and Group 3 (n=20) was filled with resin composite preheated to 60C. Teeth were subjected to a thermocycling regime (500X, 5 - 55C), 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 50C showed an intact tooth-restoration interface with no micro leakage. However, the preheated composite at 60C showed large amount of microleakage.

Conclusion: Under the current limitation of the study, preheated composite at 50C showed the least micro-leakage.