Effect of photoactivation systems and resin composites on the microleakage of esthetic restorations.
OBJECTIVE
The aim of this study was to evaluate the influence of four photoactivation systems [quartz tungsten halogen (QTH), light-emitting diode (LED), argon ion laser (AL), and plasma arc curing PAC)] on cementum/dentin and enamel microleakage of Class II restorations using a microhybrid [Z250-3M ESPE] and two packable composites [(SureFil-Dentsply and Tetric Ceram HB-Ivoclair/Vivadent].


METHODS
Three hundred sixty "vertical-slot Class II cavities" were prepared at the mesial surface of bovine incisors using a 245 carbide bur in a highspeed handpiece. Specimens were divided into twelve groups (composite-photoactivation systems). Half of the specimens had the gingival margin placed in enamel (n=15) and the other half in cementum/dentin (n=15). Composites were inserted and cured in 2 mm increments according to manufacturers' recommended exposure times. After polishing, the samples were immersed in 2% methylene blue solution, sectioned, and evaluated at the gingival margins. Data were submitted to statistical analysis using the Kruskal-Wallis and Mann-Whitney tests.


RESULTS
No significant differences were found among the photoactivation systems and among resin composites (p>0.05). Microleakage was not significantly affected by location (enamel vs. cementum/dentin, p>0.05). These findings suggested neither the photoactivation systems nor the resin composite types might have an effect on the microleakage at gingival margins Class II cavities.
Cavalcante
Larissa Maria Assad
LM
Clinical Dentistry Program, Department of Restorative Dentistry, School of Dentistry, Unviersity of Campinas, Piracicaba, SP, Brazil. lacavalcante@fop.unicamp.br
Peris
Alessandra Resende
AR
Ambrosano
Glaucia Maria Bovi
GM
Ritter
Andre Vicente
AV
Pimenta
Luiz Andre Freire
LA
D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000528:radiation effects*; D003737:Dental Cavity Preparation; D003748:Dental Equipment; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D006219:Halogens; D007834:Lasers; D008027:Light; D044367:Phase Transition; D011897:Random Allocation; D012666:Semiconductors; D018709:Statistics, Nonparametric; D014978:Xenon
D003188:Composite Resins; C444701:Filtek Z250; D006219:Halogens; C403464:SureFil packable composite; C121818:Tetric ceram; D014978:Xenon