Tensile bond strength of resin-modified glass-ionomer cement to microabraded and silica-coated or tin-plated high noble ceramic alloy.

ABSTRACT

PURPOSE: The purpose of this study was to evaluate the influence of alloy surface microabrasion, silica coating, or microabrasion plus tin plating on the tensile bond strengths between a resin-modified glass-ionomer luting cement and a high-noble alloy. Bond strength between the microabraded alloy specimens and conventional glass-ionomer cement or resin cement were included for comparison. MATERIALS AND METHODS: One hundred twenty uniform size, disk-shaped specimens were cast in a noble metal alloy and divided into 6 groups (n = 10 pairs/group). The metal surfaces of the specimens in each group were treated and cemented as follows. Group 1 No surface treatment (as cast, control), cemented with a resin-modified glass-ionomer cement. Group 2 Microabrasion with 50-microm aluminum oxide particles, resin-modified glass-ionomer cement. Group 3 A laboratory microabrasion and silica coating system, resin-modified glass-ionomer cement. Group 4 Microabrasion and tin-plating, resin-modified glass-ionomer cement. Group 5 Microabrasion only, conventional glass-ionomer cement. Group 6 Microabrasion and tin-plating, conventional resin cement. The uniaxial tensile bond strength for each specimen pair was determined using an Instron Universal Testing Machine (Instron Corp, Canton, MA). Results were analyzed using a one-way analysis of variance (alpha = 0.05) and a Tukey post-hoc analysis. RESULTS: Mean bond strength Group 1 3.6 (+/- 1.5) MPa. Group 2 4.2 (+/-0.5) MPa. Group 3 6.7 (+/- 0.9) MPa. Group 4 10.6 (+/- 1.8) MPa. Group 5 1.1 (+/- 0.4) MPa. Group 6 14.6 (+/- 2.3) MPa. Group 6 was significantly stronger than Group 4. The bond strength of specimens cemented with the resin-modified glass-ionomer cement using microabrasion and tin-plating (Group 4) was significantly stronger than all other groups except the resin cement with microabrasion and tin-plating (Group 6). CONCLUSION: Microabraded and tin-plated alloy specimens luted with the resin-modified glass-ionomer cement resulted in the greatest mean tensile strengths for the resin-modified glass-ionomer cement groups. This strength was 73% of the mean tensile strength of microabraded specimens luted with resin cement.