The effect of amalgam bonding on resistance form of Class II amalgam restorations.
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.
Della Bona
A
A
Department of Restorative Dentistry, University of Passo Fundo, School of Clinical Dentistry, Brazil.
Summitt
J B
JB
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
C070606:Amalgambond; D003722:Dental Alloys; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D003723:Dental Amalgam; C072894:Valiant PhD