Arzu Mujdeci1, Osman Gokay. 1. Faculty of Dentistry, University of Ankara, Turkey. mujdeci@dentistry.ankara.edu.tr
Abstract
STATEMENT OF PROBLEM: The role of airborne-particle abrasion on the bond strength of restorative materials to enamel and dentin is controversial. PURPOSE: The purpose of this study was to evaluate the effect of airborne-particle abrasion on the shear bond strengths of 4 restorative materials to enamel and dentin. MATERIAL AND METHODS: One hundred twelve extracted human maxillary anterior teeth were divided into 2 groups of 56 teeth each. In the first group flat enamel surfaces were prepared, and in the second flat dentin surfaces were prepared. Half the teeth in each group (n=28) were airborne-particle abraded. The remaining 28 teeth in each group were prepared with silicone carbide paper (control). Specimens in both groups were divided into 4 subgroups (n=7). A composite, a compomer, a resin-modified glass ionomer cement, and a conventional glass ionomer cement were applied to enamel and dentin surfaces (3 mm diameter and 4 mm height). After 24 hours of storage in water, specimens were subjected to shear forces in a universal testing machine at a crosshead speed of 0.5 mm/min until fracture. Shear bond strength data (MPa) were analyzed with 3-way ANOVA and Tukey HSD tests (alpha=.05). RESULTS: Airborne-particle-abraded specimens showed significantly higher shear bond strengths than control specimens. The 2-way interaction between tooth structure and restorative materials was significant. CONCLUSION: The use of airborne-particle abrasion increased the shear bond strength of restorative materials tested to enamel and dentin.
STATEMENT OF PROBLEM: The role of airborne-particle abrasion on the bond strength of restorative materials to enamel and dentin is controversial. PURPOSE: The purpose of this study was to evaluate the effect of airborne-particle abrasion on the shear bond strengths of 4 restorative materials to enamel and dentin. MATERIAL AND METHODS: One hundred twelve extracted human maxillary anterior teeth were divided into 2 groups of 56 teeth each. In the first group flat enamel surfaces were prepared, and in the second flat dentin surfaces were prepared. Half the teeth in each group (n=28) were airborne-particle abraded. The remaining 28 teeth in each group were prepared with silicone carbide paper (control). Specimens in both groups were divided into 4 subgroups (n=7). A composite, a compomer, a resin-modified glass ionomer cement, and a conventional glass ionomer cement were applied to enamel and dentin surfaces (3 mm diameter and 4 mm height). After 24 hours of storage in water, specimens were subjected to shear forces in a universal testing machine at a crosshead speed of 0.5 mm/min until fracture. Shear bond strength data (MPa) were analyzed with 3-way ANOVA and Tukey HSD tests (alpha=.05). RESULTS: Airborne-particle-abraded specimens showed significantly higher shear bond strengths than control specimens. The 2-way interaction between tooth structure and restorative materials was significant. CONCLUSION: The use of airborne-particle abrasion increased the shear bond strength of restorative materials tested to enamel and dentin.
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