@article{article_272626, title={Effect of transdental light exposure on polymerization of composite resin}, journal={Selcuk Dental Journal}, volume={1}, pages={108–114}, year={2014}, DOI={10.15311/1441.272626}, author={Bala, Oya and Arısu, Hacer Deniz and Yıkılgan, İhsan and Yanar, Nazlı Özge and Kalaycı, Şükrü}, keywords={Composite resin, degree of convertion, surface hardness, transdental light exposure}, abstract={Background: To evaluate the effect of transdental light curing over different thickness dentin discs, on polymerization of resin composites with FTIR spectroscopy and Vickers microhardness testing device.Methods: 1, 2 and 3 mm diameter dentin discs were prepared from the buccal surface of non- carious third molars. 5mm diameter and 2mm depth composite samples were prepared on teflon mold (Clearfill Majesty Esthetic) and a thermocouple connected digital thermometer placed into the composite resins. Dentin discs were placed different thickness as group 1: 1 mm, group 2: 2 mm, group 3: 3mm. Then resin composites were placed and light cured 40s with LED curing units over the dentin disks. Control group samples were light cured over a 10mm thickness glass plate. Each groups included 10 samples. After polymerization; the increase of heat was recorded with digital thermometer. Five of the samples were used for microhardness test, remaining 5 samples were used for measurement of degree of convertion. DC was evaluated with FTIR spectroscopy, microhardness was measured with Vickers microhardness testing device. ANOVA and Tukey test were used for the statistical analysis.Results: For increase of heat in the composite materials there were significant differences between groups during the polymerization. Group 1 (95.16%) showed highest DC values, the lowest values were obtained in group 3. Group 1 exhibited the highest microhardness values at the both top and bottom side.Conclusion: According to this study results, it can be concluded that the dentin thickness cover the composite resins has an effect on polymerization of composite resins.}, number={3}, publisher={Selcuk University}