Effect of polymerization mode and time of adhesive system on microleakage in composite resin restorations

Full text
Author(s):	Soares, Giulliana P. ; Silva, Gustavo G. ; Ambrosano, Glaucia M. B. ; Lima, Debora A. N. L. ; Marchi, Giselle M. ; Lovadino, Jose R. ; Aguiar, Flavio H. B. Total Authors: 7
Document type:	Journal article
Source:	JOURNAL OF INVESTIGATIVE AND CLINICAL DENTISTRY; v. 5, n. 4, p. 6-pg., 2014-11-01.
Abstract
Aim: To quantify the microleakage on restorations carried out with a two-step etch-and-rise adhesive system and nanofilled composite resin after thermal and mechanical loading cycling. Methods: Ninety cavities were prepared on proximal surfaces of incisive teeth, and were randomly divided according to the photoactivation time (10, 20, or 30 s) and light-curing mode (Quartz Tungsten Halogen (QTH) lamps, 450 mW/cm 2; Light Emitting Diode (LED) second generation, 1100 mW/cm 2; or LED third generation, 700 mW/cm 2) of an adhesive system (n = 10). Following restorative procedures and thermal and mechanical loading cycling, the samples were immersed in Methylene Blue for 2 h. The samples were ground, and the powder was prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed by ANOVA and Tukey's test at the 5% level of significance. Results: There were no significant statistical difference in microleakage between the light-curing mode (P = 0.1212) and light-curing time (P = 0.2043). Conclusion: Different curing modes and increasing the curing time were not factors that influenced the process of microleakage. (AU)