title: Failure load of teeth restored by use of alumina copings: Influence of residual tooth structure and cementation.
abstract: To evaluate failure loads of teeth restored by use of alumina-coping, and to assess the effects of different amounts of residual tooth structure and different cements, standardized artificial alumina copings were fabricated on seventy-two molars. 24 of the copings were cemented by use of an adhesive resin cement (P-group), n=24 by use of glass-ionomer cement (K-group), and n=24 by use of a self-adhesive modified composite resin-cement (R-group). After artificial ageing (10,000 thermal-cycles between 6.5 and 60°C; 1,200,000 chewing cycles with Fmax=64 N), the specimens were loaded until failure (cross-head-speed: 0.5 mm/min). In the K-group 83% of the specimens failed during chewing simulation. Statistical analysis included chi-squared-test, unpaired-to-sample-t-test, and ANOVA. For severely damaged teeth, loads to failure in the P-group (384 N) were significantly (p=0.03) higher than in the R-group (295 N). For severely damaged teeth, use of composite resin cement resulted in higher loads to failure than use of other cements.
authors.affiliation: Department of Prosthodontics, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany. Marc_Schmitter@med.uni-heidelberg.de
authors.forename: Marc
authors.initials: M
authors.lastname: Schmitter
authors.forename: Tomislav
authors.initials: T
authors.lastname: Posavec
authors.forename: Denise
authors.initials: D
authors.lastname: Mueller
authors.forename: Katrin
authors.initials: K
authors.lastname: Mussotter
authors.forename: Peter
authors.initials: P
authors.lastname: Rammelsberg
authors.forename: Stefan
authors.initials: S
authors.lastname: Rues
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000537:Aluminum Oxide / Q000737:chemistry*; D001696:Biomechanical Phenomena; D001732:Bite Force; D002484:Cementation / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008277:Magnesium Oxide / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D008963:Molar / Q000503:physiopathology*; D011076:Polycarboxylate Cement / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013871:Thiones / Q000737:chemistry; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: C521707:Alloy Primer; D003188:Composite Resins; D003764:Dental Materials; C500742:ED Primer II; D005899:Glass Ionomer Cements; D008689:Methacrylates; C438843:Panavia-Fluoro; D011076:Polycarboxylate Cement; C483701:Rely X Unicem; D019279:Resin Cements; D013871:Thiones; D008277:Magnesium Oxide; C040235:Ketac-cem; D000537:Aluminum Oxide; D015034:Zinc Oxide