Microleakage of a condensable resin composite: an in vitro investigation.
OBJECTIVE
The purpose of this investigation was to evaluate microleakage in Class II cavities restored with the condensable resin composite SureFil, placed with or without a liner and 1 of 2 different dentin bonding agents.


METHODS
Extracted noncarious human teeth were randomly divided into 4 groups of 15 each and restored according to manufacturer's instructions: group 1, SureFil and Prime & Bond NT; group 2, SureFil and PQ1; group 3, SureFil, PermaFlow, and PQ1; group 4, Heliomolar and Syntac Single-Component (control). Specimens were stored in 37 degrees C water for 24 hours. All specimens were thermocycled between 5 degrees C and 55 degrees C for 500 cycles. Each specimen was immersed in 0.2% basic fuchsin dye for 24 hours and then sectioned longitudinally and horizontally. Dye penetration at enamel and cementum margins were viewed at x30 magnification by 2 independent, calibrated evaluators. Specimens exhibiting dye penetration > or = 0.1 mm beyond the cavosurface margin were considered to have leakage.


RESULTS
Chi-square tests revealed no statistically significant differences in the presence of microleakage when all groups were analyzed together. However, 2 by 2 comparisons revealed that group 3 had significantly fewer specimens with microleakage than did group 1, 2, or 4.


CONCLUSIONS
To limit microleakage, a flowable composite should be used as a liner when a condensable composite material is used.
Tung
F F
FF
Division of Restorative and Prosthodontic Sciences, New York University, College of Dentistry, 345 East 24th Street, New York, New York 10010, USA. fft1@is4.nyu.edu
Estafan
D
D
Scherer
W
W
D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003736:Dental Cavity Lining; D003739:Dental Cementum / Q000648:ultrastructure; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification* / Q000473:pathology; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012394:Rosaniline Dyes; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C513708:Heliomolar; D008689:Methacrylates; C119199:PermaQuik; C098570:Permagen Adhesive; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C103500:Prime & Bond; D019279:Resin Cements; D012394:Rosaniline Dyes; C403464:SureFil packable composite; C078484:Syntac dentine adhesive; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; C025485:basic fuchsin