Comparative analysis of polymerization shrinkage of different resin composites.
This study sought to compare the shrinkage of 3 resin composites after polymerization, using different curing modes and 2 methods of analysis, with 45 samples in each group. To evaluate free linear shrinkage, specimens were prepared in Teflon molds (8 mm diameter x 2 mm thick) with 1 of 2 methacrylate-based resins or a silorane-based resin. To evaluate wall-to-wall shrinkage, cavities (1.5 mm thick x 3 mm diameter) were prepared in 45 healthy bovine incisors and then restored. In both tests, the same curing lights were used: conventional quartz-tungsten-halogen, a conventional light-emitting diode (LED), and an exponential LED. Gaps were measured microscopically, and the gap percentage was calculated. The results were analyzed by 2-way ANOVA and Tukey's test (α = 0.05). Curing modes differed significantly in the free linear shrinkage test group, while resin composites did not. In the wall-to-wall shrinkage group, there were significant differences between the resin composites.
Iana Coutinho
IC
Barretto
Luana Farias
LF
Pontes
Karina Kato
KK
Carneiro
Jesuina Lamartine Nogueira
JL
Araujo
Rafael Yague
RY
Ballester
Cecy Martins
CM
Silva
D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry* / Q000627:therapeutic use; D055117:Curing Lights, Dental; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods; D058105:Polymerization
D003188:Composite Resins; C444701:Filtek Z250; C544925:filtek P90; C533204:filtek Z350
curing lights; dental materials; polymerization