Shear bond strength, failure modes, and confocal microscopy of bonded amalgam restorations.

Luigi Cianconi, Gabriele Conte, Manuele Mancini

Journal: Dental materials journal 2011;30(2):216-21

PMID: 21383518

Free Full Text on J-STAGE, Japan Science and Technology Information Aggregator, Electronic View on PubMed

Abstract

This study evaluated the shear bond strength, failure modes, and confocal microscopy of two different amalgam alloy restorations lined with five adhesive systems. Two regular-set high-copper dental amalgam alloys, Amalcap Plus and Valiant Ph.D, and five commercially available adhesive systems were selected. One hundred and twenty freshly-extracted human third molars were used for the study. The results were statistically evaluated using two-factor analysis of variance (ANOVA). The shear bond strength (SBS) of amalgam to dentin was significantly affected by both the adhesive (p<0.0001) and amalgam alloy (p<0.0002). Regarding mode of failure (MF), among samples restored with Valiant Ph.D, 31 of 50 exhibited adhesive failure, and 19 displayed mixed failure. Laser optical microscopy (OM) of the bonded interface revealed the presence of a good hybrid layer was evident in all experimental groups. Higher bond strengths were measured for four of the five adhesives when used in combination with the spherical alloy.

Address: Restorative Dentistry and Endodontics, University of Rome Tor Vergata, Rome, Italy.

DOI: 10.4012/dmj.2010-118

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MeSH Terms: Acid Etching, Dental, Adhesiveness, Coloring Agents, Dental Alloys, Dental Amalgam, Dental Cavity Lining, Dental Restoration, Permanent, Dental Stress Analysis, Dentin, Dentin-Bonding Agents, Humans, Methacrylates, Microscopy, Confocal, Polymethacrylic Acids, Resin Cements, Self-Curing of Dental Resins, Shear Strength, Stress, Mechanical