title: Effect of temperature on the mass and color stability of additional photoinitiatorcontaining composite resins.
abstract: The purpose of this study was to evaluate how the temperature affects the stability of polymerized additional photoinitiator-containing composite resins. Five resin products were light-cured using a quartz-tungsten-halogen, and single and dual emission peaks lightemitting diodes. The degree of conversion (DC) and water sorption, solubility, and color change of the specimens were evaluated after immersion in the solutions of different temperatures (4, 37, and 60ºC) for 14 days. On the top surface, the light-curing units had no significant influence on DC of the tested specimens. On the bottom surface, the influence was inconsistent. As the solution temperature increased, water sorption also consistently increased in all specimens, whereas solubility changed inconsistently. Water sorption and solubility had a high linear correlation only at low temperature solution. Color change of the specimens was similar, mostly slight, and statistically inconsistent regardless of solution temperature. The restored composite resins are needed to avoid contact with hot solutions for durable dental restoration.
authors.affiliation: Department of Dental Materials, School of Dentistry and Medical Research Institute, Pusan National University, Mulgeum-eup, Yangsan, 626-870, Korea.
authors.forename: Tae-Hyung
authors.initials: TH
authors.lastname: Kim
authors.forename: Franklin
authors.initials: F
authors.lastname: García-Godoy
authors.forename: Ching-Chang
authors.initials: CC
authors.lastname: Ko
authors.forename: Jeong-Kil
authors.initials: JK
authors.lastname: Park
authors.forename: Hyung-Il
authors.initials: HI
authors.lastname: Kim
authors.forename: Yong-Hoon
authors.initials: YH
authors.lastname: Kwon
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D002164:Camphor / Q000031:analogs & derivatives / Q000737:chemistry; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental / Q000145:classification; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D007101:Immersion; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation; D008422:Materials Testing; D058567:Photoinitiators, Dental / Q000737:chemistry*; D058105:Polymerization; D012995:Solubility; D013053:Spectrophotometry / Q000379:methods; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C485363:Aelite LS; D003188:Composite Resins; D003764:Dental Materials; D058567:Photoinitiators, Dental; C501891:Tetric EvoCeram; C515948:Vit-l-escence Trans Ice; C533204:filtek Z350; C451741:point 4 composite resin; D014867:Water; D002164:Camphor; C553149:camphorquinone