Abstract
Objectives. To examine the effect of immediate dentin sealing (IDS), with dentin bonding agents (DBAs) applied to freshly cut dentin, on the shear bond strength of etched pressed ceramic luted to dentin with RelyX Unicem (RXU) cement. Method. Eighty extracted noncarious third molars were ground flat to expose the occlusal dentin surfaces. The teeth were randomly allocated to five groups (A to E) of sixteen teeth each. Groups A to D were allocated a dentin bonding agent (Optibond FL, One Coat Bond, Single Bond, or Go!) that was applied to the dentin surface to mimic the clinical procedure of IDS. These specimen groups then had etched glass ceramic discs (Authentic) luted to the sealed dentin surface using RXU. Group E (control) had etched glass ceramic discs luted to the dentin surface (without a dentin bonding agent) using RXU following the manufacturer's instructions. All specimens were stored for one week in distilled water at room temperature and then shear stressed at a constant cross-head speed of 1 mm per minute until failure. Statistical analysis was performed by ANOVA followed by post hoc Tukey HSD method (P < 0.05) applied for multiple paired comparisons. Results. The shear bond strength results for group A to E ranged from 6.94 ± 1.53 to 10.03 ± 3.50 MPa. One-way ANOVA demonstrated a difference (P < 0.05) between the groups tested and the Tukey HSD demonstrated a significant (P < 0.05) difference between the shear bond strength (SBS) of Optibond FL (Group A) and Go! (Group D). There was no statistical difference (P > 0.05) in the SBS between the test groups (A–D) or the control (group E). Conclusion. IDS using the dentin bonding agents tested does not statistically (P > 0.05) affect the shear bond strength of etched pressed ceramic luted to dentin with RXU when compared to the control.
Highlights
The preparation of teeth for indirect bonded restorations involves the cutting of dentin and the exposure of dentinal tubules [1]
The ANOVA test demonstrated a difference between the groups tested that was further compared with the Tukey HSD test to show a significant (P < 0.05) difference between groups A (Optibond FL) and D (Go!)
The dentin surfaces were treated with different bonding agents, the glass ceramic discs luted in place and the samples stored in distilled water for 7 days prior to testing
Summary
The preparation of teeth for indirect bonded restorations involves the cutting of dentin and the exposure of dentinal tubules [1]. More conservative approaches to restorative dentistry have been made possible by the advent of adhesive technology which enables sealing of these exposed dentin tubules [3]. It is possible to seal these freshly cut dentin surfaces with a dentin bonding agent immediately after tooth preparation, before impression taking. Most studies on the bond strength of dentin bonding agents use freshly prepared dentin. Teeth require provisional restorations to protect the dentin and provide for the patient’s functional and aesthetic needs when providing indirect restorations. Dentin contaminated with provisional cement can reduce the potential for dentin bonding [4]
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