Evaluation of Bond Strength with the Immediate Dentinal Sealing Technique

Immediate dentinal sealing (IDS) is a novel restorative technique whereby an adhesive coat is applied to dentin prior to provisional cementation. Following cement removal, IDS is claimed to increase bond strength between dentin and the final composite restoration.

Objectives: This study measures the shear bond strength of composite to dentin following: 1) delayed dentinal sealing (DDS), 2) immediate dentinal sealing (IDS), and 3) without provisional cementation (control).

Methods: Human molars were ground to midcoronal dentin and divided into DDS, IDS, and control groups (n=10 per group). DDS specimens were immediately coated with provisional cement (TempBond NE, Kerr). IDS specimens were treated with etch/primer/adhesive (Optibond FL, Kerr), light cured, and coated with provisional cement. Both groups were stored in water at 37°C for two weeks. The cement was cleaned from both groups using airborne particle abrasion. DDS specimens were treated with etch/primer/adhesive, light cured, and bonded with a post of composite material (Z100, 3M ESPE). IDS specimens were treated with one coat of adhesive and bonded with a composite post. Control specimens received etch/primer/adhesive treatment and were bonded with a composite post. Twenty-four hours after composite bonding, the posts were removed for shear bond strength testing in a universal testing machine. One-way ANOVA and Dunnett's test were used to determine significant intergroup differences (alpha=0.05).

Results: Shear bond strengths were recorded as: 39.75±4.7 MPa (DDS), 25.94±6.5 MPa (IDS), 35.71±6.4 MPa (control). Using the Dunnett's method, the DDS group was not found to be significantly different from the control (P=0.117). The IDS group, however, was found to be significantly less than the control (P<0.001). Conclusions: For the IDS technique to be accepted as providing greater bond strengths than the traditional DDS technique, the IDS technique must be further investigated.

Support: NIDCR-T32DE017607.