AIM: to compare the shear-peel bond strength of five orthodontic cements: a conventional glass ionomer cement (Ketac Cem), two resin-modified glass ionomer cements (3M Multicure Glass Ionomer and Fuji Ortho LC) and two polyacid-modified composite resin cement (Ultra Band-Lok and Transbond Plus). METHODS: cements were placed in a 3mm diameter mold at bonding interface and bonded to 6 x 6mm standard and sandblasted stainless steel band specimens mounted to acrylic blocks. Specimens were stored at 37ºC and 100% relative humidity for 24 hours and debonded in tension on a testing machine at 0.05cm/minutes. Data were analyzed by one-way analysis of variance (ANOVA) followed by a Tukey multiple comparison procedure in the same surface treatment groups (sandblasted or non-sandblasted) and by paired t-tests in different surface treatment groups (sandblasted and non-sandblasted) (p=0.01). RESULTS: Ultra Band-Lok demonstrated significant greater shear-peel bond strength (p<0.01) in the non-sandblasted groups, and no statistically significant differences were noted between others cements. In the sandblasted groups, resin-modified glass ionomer cements demonstrated the highest mean bond strength (p<0.01), and 3M Multicure Glass Ionomer showed a greater shear-peel bond strength (p<0.01) than Ketac Cem and Fuji Ortho LC. CONCLUSION: sandblasting increased shear-peel bond strength in all tested groups (p<0.01).
Orthodontic banding; Sandblasting; Shear-peel bond strength
