Effect of immediate dentin sealing and temporary cement removal methods on microtensile bond strength of a universal resin cement.

Purpose: To evaluate the impact of different surface cleaning methods and immediate dentin sealing (IDS) on the bond strength of a universal adhesive resin cement to dentin, using a 3D-printed restorative material.

Methods: Extracted human third molars were prepared and divided into two groups: with and without IDS. Temporary restorations were cemented onto the prepared tooth surfaces. Five surface cleaning methods were applied to both groups: pumice, pumice with soap, sandblasting, EDTA, and laser. 3D printed resin blocks were fabricated and bonded to the teeth using a universal adhesive resin cement. After thermal cycling and water storage, microtensile bond strength tests were conducted. Failure modes were analyzed using light microscopy and SEM. Statistical analyses were made.

Results: Microtensile bond strength (µTBS) was significantly influenced by both surface cleaning methods and IDS application. Sandblasting and laser cleaning resulted in the highest µTBS values, particularly when combined with IDS. IDS significantly increased µTBS compared to the control group, regardless of the cleaning method. SEM analysis revealed that adhesive failure was the predominant failure mode in most groups, with some mixed failures observed.

Clinical significance: Prepared tooth surface cleaning procedures increased the microtensile bond strength of the universal adhesive resin cement regardless of immediate dentin sealing.