Effect of photoactivation systems and resin composites on the microleakage of esthetic restorations.

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].
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.
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.
AuthorsLarissa Maria Assad Cavalcante, Alessandra Resende Peris, Glaucia Maria Bovi Ambrosano, Andre Vicente Ritter, Luiz Andre Freire Pimenta
JournalThe journal of contemporary dental practice (J Contemp Dent Pract) Vol. 8 Issue 2 Pg. 70-9 ( 2007) ISSN: 1526-3711 [Electronic] United States
PMID17277829 (Publication Type: Comparative Study, Evaluation Studies, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Composite Resins
  • Filtek Z250
  • Halogens
  • SureFil packable composite
  • Tetric ceram
  • Xenon
  • Animals
  • Cattle
  • Composite Resins (radiation effects)
  • Dental Cavity Preparation
  • Dental Equipment
  • Dental Leakage (prevention & control)
  • Dental Marginal Adaptation
  • Dental Restoration, Permanent (methods)
  • Halogens
  • Lasers
  • Light
  • Phase Transition
  • Random Allocation
  • Semiconductors
  • Statistics, Nonparametric
  • Xenon

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