717 Gingival Microleakage of Class V Composite Restorations with Fiber Inserts

Friday, March 23, 2012: 10:45 a.m. - 12:15 p.m.
Presentation Type: Oral Session
W.M. AHMED, W. EL-BADRAWY, A. PRAKKI, G. KULKARNI, and O. EL-MOWAFY, Dentistry, University of Toronto, Toronto, ON, Canada
Objectives:  This study investigated effect of glass and polyethylene fibers inserted at gingival margins of Class V composite restorations on microleakage. Methods: Sixty premolars were sterilized and mounted in resin bases. Standard Class V cavities were prepared buccally and lingually, 1 mm below CEJ. Prepared teeth were randomly divided into 12 equal groups (n=10). Two types of fiber inserts were used, glass fiber (Ever Stick, StickTech, Finland) and polyethylene fiber (Ribbond-THM, USA) with four bonding agents: Clearfil SE Bond (Kuraray) (SE), Scotch Bond Multipurpose (3M/ESPE) (SBMP), Prime and Bond NT (Dentsply) (NT), and Filtek-LS self-adhesive bonding agent (3M/ESPE) (LS). In experimental groups, fiber inserts were inserted into restorations at gingival seat. Control groups had no inserts. Two composite materials were used FilteK Z-250 (3M/ESPE) (Z-250), and low-shrinkage composite Filtek-LS, (3M/ESPE) (FLS). The restorations were incrementally placed and polymerized. Specimens were then stored in distilled water at 37C° for seven days then thermocycled for 300 cycles. Tooth surfaces were sealed with nail polish except at restoration margins. Specimens were immersed in 2% procion red dye solution for 24h then sectioned buccolingually at center and dye penetration was assessed by 3 assessors to determine  extent of microleakage according to five-point scale. Data was statistically-analyzed with non-parametric Kruskal-Wallis test and Mann-Whitney U test. Results: The fiber groups showed significantly less microleakage scores compared to control groups (p<0.05). Combining glass fibers with SE/Z-250 and polyethylene fibers with LS/FLS produced the lowest degree of microleakage. Kruskal-Wallis test revealed significant differences in mean microleakage scores among the group p = 0.032. Conclusions: The use of fiber inserts significantly reduced gingival microleakage in Class V composite restorations with gingival margins in dentin irrespective of the adhesive used. SBMP/Z250 combined with glass fibers produced the lowest microleakage scores. Acknowledgements: StickTech, Ribbond-THM, Kuraray, 3M/ESPE, Dentsply.

Keywords: Adhesion, Composites, Dentin, Dentin bonding agents and Microleakage
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