title: The effect of amalgam bonding on resistance form of Class II amalgam restorations.
abstract: OBJECTIVE
  This study evaluated the load required to produce failure in Class II bonded amalgam restorations.
  
  
  METHODS
  Five groups of 12 maxillary molars were mounted. Class II mesio-occlusal preparations were cut: group 1, extension through central grooves, without retention grooves; group 2, proximal slot preparation, without retention grooves; groups 3 and 5, slot preparation with long facial and lingual retention grooves; group 4, slot preparation without grooves, with unsupported proximal enamel allowed to remain. Groups 1 to 4 were restored with an amalgam-bonding system and amalgam; in group 5, no amalgam-bonding material was used.
  
  
  RESULTS
  Mean (SD) failure loads: group 1, 281 (77) N; group 2, 246 (101) N; group 3, 238 (84) N; group 4, 254 (100) N; and group 5, 191 (66) N.
  
  
  CONCLUSIONS
  Although there was a trend toward greater resistance to dislodgment or fracture when an amalgam-bonding technique was used, its use did not significantly increase the resistance to failure when compared to retention grooves alone.
authors.affiliation: Department of Restorative Dentistry, University of Passo Fundo, School of Clinical Dentistry, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Della Bona
authors.forename: J B
authors.initials: JB
authors.lastname: Summitt
mesh_terms: D000704:Analysis of Variance; D003722:Dental Alloys; D003723:Dental Amalgam; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005069:Evaluation Studies as Topic; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates
chemical_list: C070606:Amalgambond; D003722:Dental Alloys; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D003723:Dental Amalgam; C072894:Valiant PhD