title: Retention of gold alloy crowns cemented with traditional and resin cements.
abstract: The aim of this study was to measure in vitro retention of cast gold crowns cemented with traditional and resin cements. Forty-eight human molars were prepared on a lathe to produce complete crown preparations with a consistent taper and split into six groups, eight crowns in each group. Crowns were cast in a high-gold alloy and then cemented. After 24 hours, the retention force (N) was recorded and mean values were analyzed by one-way analysis of variance and the Fisher post-hoc least significant difference (PLSD) multiple comparisons test (a = .05). Failure sites were examined under 3100 magnification and recorded. Mean values (SD) for each group in increasing order of retention force were: Harvard Cement: 43 N (27), TempoCem: 59 N (16), PermaCem Dual: 130 N (42), RelyX Luting Cement: 279 N (26), Contax and PermaCem Dual: 286 N (38), and TempoCem with Contax and PermaCem Dual: 340 N (14). The Fisher PLSD interval (P = .05) for comparing cements was 29 N. Zinc-phosphate cement and provisional resin cements had the lowest retention forces. Resin cement with a bonding agent and the hybrid-ionomer cement had similar retention forces. Resin cement with a bonding agent applied after use of a provisional resin cement had a significantly higher retention force than the other cements tested.
authors.affiliation: Department of Preventive and Restorative Dental Science, Unversity of California at San Francisco, California 94143-0758, USA. Lilliam.Pinzon@ucsf.edu
authors.forename: Lilliam M
authors.initials: LM
authors.lastname: Pinzón
authors.forename: Gary N
authors.initials: GN
authors.lastname: Frey
authors.forename: Mark M
authors.initials: MM
authors.lastname: Winkler
authors.forename: William H
authors.initials: WH
authors.lastname: Tate
authors.forename: John O
authors.initials: JO
authors.lastname: Burgess
authors.forename: John M
authors.initials: JM
authors.lastname: Powers
mesh_terms: D002484:Cementation / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003738:Dental Cements / Q000737:chemistry*; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D005899:Glass Ionomer Cements / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008963:Molar / Q000473:pathology; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic; D014867:Water / Q000737:chemistry; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D003188:Composite Resins; C483521:Contax; D003738:Dental Cements; D005899:Glass Ionomer Cements; D006047:Gold Alloys; D019279:Resin Cements; C084550:Vitremer; D014867:Water; D015036:Zinc Phosphate Cement; C074226:Harvard Cement