Influence of sandblasting distance on enamel and ceramic structure bond strength

Abstract

<p><strong>Objetive:</strong> The purpose of this study is was to evaluate the influence of sandblasting ceramic and enamel structure on bond strength, changing distance.</p><p><strong>Material and methods:</strong> 60 third molars , were selected, enamel surfaces were ground flat with wet 600 - 2000 grit aluminum oxide abrasive papers and polished with three, one, and one-fourth micrometer-grit diamond pastes. Obtained 120 lithium disilicate-based core ceramic discs ( 2 mm diameter;1 mm thickness), divided into 7 groups [Group C, don’t sandblasting, Group SB-E(5-10) enamel sandblasting 5 and 10 mm, Group SB-C(5-10) ceramic sandblasting 5 mm and 10 mm, Group SB-EC(5-10) enamel and ceramic sandblasting 5 mm and 10 mm] after was performed microshear and Atomic Force Microscopy (AFM), Statistic Teste of normality , after one-way ANOVA and Tukey test (α: 0.05).</p><p><strong>Results:</strong> The group C present bond strength (59.2±12.5), the group SB-E 5 mm (21.7±08.8) (p<0.005), the group SB-E10 (53.6±14.3).</p><p><strong>Conclusion:</strong> The use of sandblasting treatment of the enamel surface a 5 mm by 20 seconds decreases the bonding strength to microshear.</p>

Active and Passive Application of the Phosphoric Acid on the Bond Strength of Lithium Disilicate

“…This sensitivity changes the ceramic structure (2) and may decrease the shear bond strength to enamel and/or dentin and/or resin cement. In order to increase the bond strength values, ceramic inner surface treatments should be performed (4,5), including abrasion with a diamond bur instrument (6), microsandblasting (7), cleaning after hydrofluoric acid (HA) application. Cleaning the vitreous dissolution is important because it increases the contact with silane and increases bond strength.…”