title: Real-Time Analysis of Temperature Changes in Composite Increments and Pulp Chamber during Photopolymerization.
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.
  
  
  METHODS
  Class I cavities prepared in third molars were restored in two composite increments (n = 5). 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).
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University Seoul 110-749, Republic of Korea.
authors.forename: Ryan Jin-Young
authors.initials: RJ
authors.lastname: Kim
authors.affiliation: Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University Seoul 110-749, Republic of Korea.
authors.forename: In-Bog
authors.initials: IB
authors.lastname: Lee
authors.affiliation: Department of Dental Hygiene, Wonju College of Medicine, Yonsei University, Wonju 220-701, Republic of Korea.
authors.forename: Jin-Young
authors.initials: JY
authors.lastname: Yoo
authors.affiliation: Department of Dental Hygiene, Wonju College of Medicine, Yonsei University, Wonju 220-701, Republic of Korea.
authors.forename: Su-Jung
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Department of Conservative Dentistry, Seoul St. Mary's Dental Hospital, Catholic University of Korea, Seoul 137-701, Republic of Korea.
authors.forename: Sin-Young
authors.initials: SY
authors.lastname: Kim
authors.affiliation: Department of Dentistry, Inje University Seoul Paik Hospital, Seoul 411-706, Republic of Korea.
authors.forename: Young-Ah
authors.initials: YA
authors.lastname: Yi
authors.affiliation: Nutrition Education Major, Graduate School of Education, Sangmyung University, Seoul 110-743, Republic of Korea.
authors.forename: Ji-Yun
authors.initials: JY
authors.lastname: Hwang
authors.affiliation: Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University Seoul 110-749, Republic of Korea.
authors.forename: Deog-Gyu
authors.initials: DG
authors.lastname: Seo
mesh_terms: D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects*; D055117:Curing Lights, Dental; D003782:Dental Pulp / Q000502:physiology / Q000528:radiation effects*; D003786:Dental Pulp Cavity / Q000502:physiology / Q000528:radiation effects*; D003804:Dentin / Q000502:physiology / Q000528:radiation effects; D006801:Humans; D008954:Models, Biological; D008963:Molar / Q000502:physiology / Q000528:radiation effects; D058105:Polymerization; D013696:Temperature; D062125:Thermometry
chemical_list: D003188:Composite Resins