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BioMed Research International
Volume 2015, Article ID 923808, 6 pages
http://dx.doi.org/10.1155/2015/923808
Research Article

Real-Time Analysis of Temperature Changes in Composite Increments and Pulp Chamber during Photopolymerization

1Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 110-749, Republic of Korea
2Department of Dental Hygiene, Wonju College of Medicine, Yonsei University, Wonju 220-701, Republic of Korea
3Department of Conservative Dentistry, Seoul St. Mary’s Dental Hospital, Catholic University of Korea, Seoul 137-701, Republic of Korea
4Department of Dentistry, Inje University Seoul Paik Hospital, Seoul 411-706, Republic of Korea
5Nutrition Education Major, Graduate School of Education, Sangmyung University, Seoul 110-743, Republic of Korea

Received 28 November 2014; Accepted 31 December 2014

Academic Editor: Cem Kurtoǧlu

Copyright © 2015 Ryan Jin-Young Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. The aim of this study was to evaluate the temperature change at various sites within the composite and on the pulpal side of dentin during polymerization of two composite increments. Materials and Methods. Class I cavities prepared in third molars were restored in two composite increments (). Temperatures were measured for 110 s using eight thermocouples: bottom center of cavity (BC), top center of 1st increment (MC), top center of 2nd increment (TC), bottom corner of cavity (BE), top corner of 1st increment (ME), top corner of 2nd increment (TE), pulpal side of dentin (PD), and center of curing light guide tip (CL). Results. Maximum temperature values (°C) measured during polymerization of 1st increment were MC (59.8); BC (52.8); ME (51.3); CL (50.7); BE (48.4); and PD (39.8). Maximum temperature values during polymerization of 2nd increment were TC 58.5; TE (52.6); MC (51.7); CL (50.0); ME (48.0); BC (46.7); BE (44.5); and PD (38.8). Conclusion. Temperature at the floor of the cavity was significantly higher during polymerization of 1st increment compared to 2nd increment. Temperature rise was higher at the center than at the corner and at the top surface than at the bottom surface of each increment.