The effect of amalgam bonding on resistance form of Class II amalgam restorations

Alvaro Della Bona, James B. Summitt

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Objective: This study evaluated the load required to produce failure in Class II bonded amalgam restorations. Method and materials: 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. Conclusion: 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.

Original languageEnglish (US)
Pages (from-to)95-101
Number of pages7
JournalQuintessence international
Issue number2
StatePublished - Feb 1 1998


  • Bonded amalgam restorations
  • Class II restorations
  • Resistance form
  • Slot preparation

ASJC Scopus subject areas

  • Dentistry(all)


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