Effects of calcium hydroxide and Biodentine contamination on the bond strength of universal adhesives to deep dentin

Objective: This study aimed to evaluate the effects of calcium hydroxide (CH) and Biodentine contamination on the shear bond strength (SBS) of three universal adhesives to deep dentin.Methods: Deep dentin surfaces were prepared from ۹۰ extracted human third molars and randomly assigned to three dentin conditions: an uncontaminated control, calcium hydroxide (CH) contamination, or Biodentine contamination. Within each condition, specimens were allocated to Scotchbond Universal Plus, Gluma Bond Universal, or G-Premio BOND Universal (n = ۱۰ per group), resulting in a ۳ × ۳ factorial design. All adhesives were applied in self-etch mode. Following composite build-up, specimens underwent ۵,۰۰۰ thermal cycles, after which SBS and failure modes were assessed. Data were analyzed using two-way analysis of variance (ANOVA) followed by the Bonferroni post-hoc test. Results: Dentin condition and adhesive system significantly affected SBS (both P < ۰.۰۰۱), whereas their interaction was not significant (P = ۰.۳۶۲). Uncontaminated dentin exhibited significantly higher SBS than both the CH- and Biodentine-contaminated dentin groups (both P < ۰.۰۰۱), whereas no significant difference was detected between the two pulp-capping materials (P = ۰.۴۸۳). G-Premio BOND Universal demonstrated significantly higher SBS than Scotchbond Universal Plus (P = ۰.۰۰۶) and Gluma Bond Universal (P < ۰.۰۰۱). Adhesive failure was the predominant failure mode, and the distribution of failure modes did not differ significantly among groups (P = ۰.۱۰۱).Conclusions: Calcium hydroxide and Biodentine contamination reduced SBS of universal adhesives to dentin. G-Premio BOND Universal demonstrated the highest overall SBS, irrespective of the dentin condition.

کلیدواژه ها:

Calcium Silicates ، Calcium hydroxide ، Dentin-Bonding Agents ، Dental pulp capping ، Dentin ، Shear strength