title: Temperature changes in bulk-fill resin composite during photopolymerization.
abstract: OBJECTIVE
  To investigate the temperature changes at multiple sites within bulk-fill resin composites and in the pulp chamber during photopolymerization in the tooth cavity.
  
  
  METHODS
  Class 1 cavities (n = 5) prepared in extracted third molars were filled with SureFil SDR Flow, a newly developed bulk-fill composite. After securing the specimens in a water bath at 36.5 degrees C, eight thermocouples were used to measure the temperature at the bottom center (BC), middle center (MC), top center (TC), bottom edge (BE), middle edge (ME), and top edge (TE) of the restoration; the pulpal aspect of the dentin (PD); and the center of the curing light tip (CL) during photopolymerization.
  
  
  RESULTS
  The maximum temperature values (degrees C) differed among the measurement sites. TC exhibited the greatest temperature increase (72.3 ± 2.4), followed by MC, BC, TE, TE, ME, CL, and BE. The lowest temperature was observed at PD (41.1 ± 1.9). The peak temperatures within the composite were observed during the early stage of light-curing, while CL and PD exhibited the highest temperature at the end stage of light-curing.
authors.forename: Ryan Jin-Young
authors.initials: RJ
authors.lastname: Kim
authors.forename: Ah
authors.initials: A
authors.lastname: Yi
authors.forename: Soo-Heang
authors.initials: SH
authors.lastname: Eo
authors.forename: In-Bog
authors.initials: IB
authors.lastname: Lee
authors.forename: Deog-Gyu
authors.initials: DG
authors.lastname: Seo
mesh_terms: D055668:Photochemical Processes; D058105:Polymerization; D012117:Resins, Synthetic; D013696:Temperature
chemical_list: D012117:Resins, Synthetic