title: Class 2 composite restorations: prevention in vitro of contraction gaps.
abstract: The present in vitro study has shown that it is possible to prevent marginal contraction gaps at composite restorations in the proximal section of Class 2 cavities by use of a condensable composite and adequate condensers. An explanation of condensation to eliminate the wall-to-wall polymerization contraction is suggested, and a possible complete Class 2 composite technique is outlined. The subject studied is only one of several problems that must be analyzed before acceptance of composite resins as Class 2 restoratives can be made possible.
mesh_terms: D000179:Acrylates; D000180:Acrylic Resins; D017438:Bisphenol A-Glycidyl Methacrylate; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins; D003737:Dental Cavity Preparation / Q000379:methods; D003793:Dental Restoration, Permanent / Q000295:instrumentation; D005898:Glass; D006801:Humans; D011140:Polyurethanes; D012821:Silanes; D013499:Surface Properties; D014070:Tooth / Q000033:anatomy & histology
chemical_list: D000179:Acrylates; D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; D012821:Silanes; D017438:Bisphenol A-Glycidyl Methacrylate; C040415:heliobond