In vitro evaluation of OCA wear resistance of posterior composites.
OBJECTIVE
Posterior composites undergo generalized (CFA) as well as localized (OCA) wear. The latter is caused by the contact of an antagonist cusp on the surface of the restoration. The purpose of this paper was to create OCA wear by means of a three-bodied wear device and also to develop a simple but reliable method for calculating loss of material in occlusal contact areas.


METHODS
After repeated cycles of loading, the OCA wear loss was measured with a profilometer, and the worn surfaces were observed through scanning electron micrography.


RESULTS
The results of this study have demonstrated significant differences in wear values among materials. These findings suggest that the difference in wear characteristics is derived from the mechanism by which the filler particle is bonded to the resin matrix.


CONCLUSIONS
If OCA wear is of sufficient magnitude, it can cause appreciable changes in functional occlusion. Thus, knowing the OCA wear resistance of various composites is a prerequisite for developing a new composite with improved longevity and better clinical performance.
Kawai
K
K
Department of Operative Dentistry, Osaka University Faculty of Dentistry, Osaka, Japan.
Leinfelder
K F
KF
D000180:Acrylic Resins / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008963:Molar; D011140:Polyurethanes / Q000737:chemistry; D015203:Reproducibility of Results; D019279:Resin Cements; D013499:Surface Properties; D014520:Urethane / Q000737:chemistry
D000180:Acrylic Resins; C084111:Charisma composite resin; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; D019279:Resin Cements; C056413:Occlusin; C065770:Herculite XR; C065771:P50 composite resin; C074741:Silux Plus; C073466:Prisma APH; D014520:Urethane; D017438:Bisphenol A-Glycidyl Methacrylate; C039734:Durafill; C046503:formula F 70