title: Increases in cavity volume associated with the removal of class 2 amalgam and composite restorations.
abstract: Removal of amalgam restorations from class 2 cavities has been shown to cause increases in cavity volume. The aim of this study was to test whether the removal of composite resin from class 2 cavities was associated with greater increases in cavity volume compared to that produced during removal of amalgam. Class 2 cavities were prepared in previously extracted human molar teeth and the cavity volumes calculated. The teeth were restored with either amalgam or a composite resin and appropriate dentin bonding agent (APH/Optibond). Two dentists removed the restorations, and the resultant cavity volumes were calculated. The results were analyzed using a standard t-test, ANOVA, and a Scheffe F-test. Removal of composite from class 2 cavities resulted in significantly increased cavity volumes compared to that when amalgam was removed. While there was significant interoperator difference in cavity volumes following removal of amalgam from class 2 cavities, there was no significant interoperator difference in cavity volumes following the removal of composite. These differences were related to the methods used to eliminate the restorations from the cavities.
authors.affiliation: University of Otago School of Dentistry, Dunedin, New Zealand.
authors.forename: A R
authors.initials: AR
authors.lastname: Hunter
authors.forename: E T
authors.initials: ET
authors.lastname: Treasure
authors.forename: A J
authors.initials: AJ
authors.lastname: Hunter
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D003723:Dental Amalgam; D003737:Dental Cavity Preparation / Q000379:methods*; D006801:Humans; D008964:Molar, Third; D012044:Regression Analysis; D012086:Reoperation; D019279:Resin Cements
chemical_list: D003188:Composite Resins; C092987:Optibond; D019279:Resin Cements; C073466:Prisma APH; D003723:Dental Amalgam; C092423:Permite C