Evaluation of the Dislodgement Resistance of Traditional Adhesive Posterior Bridges Compared With Adhesive Posterior Bridges Prepared With Standard and Modified Slot-Back Dummies: An In Vitro Study.

Background Bridges with minimal preparation have received great acceptance in recent years. Since their first appearance, they have undergone many types of modifications and improvements. Aim This study aimed to compare three types of minimal preparation bridges in terms of force required for dislodgement and the type of deformation incurred for each of the abutments and prostheses. Materials and methods The research sample consisted of 36 adhesive bridges divided into three equal groups. The first group contained traditional adhesive bridges prepared from the proximal and lingual surfaces with a thickness of 1 mm, the second group contained adhesive bridges with standard slot-back dummies, and the third group contained adhesive bridges with modified slot-back dummies. Each bridge underwent a pressure test, which was directed from the buccal toward the lingual side and was inclined to the horizontal plane at an angle of 45°. A one-way analysis of variance (ANOVA) test was conducted with a significance level of 0.05. Results The average dislodgement resistance value in the traditional adhesive bridges group was 480,858 N, with no statistically significant difference from the standard slot-back dummy group (p = 1), for which the average dislodgement resistance value was 486,050 N. The average dislodgement resistance value in the modified slot-back dummy group was 746,733 N, with a statistically significant difference compared with other study groups (p < 0.05). Conclusion The adhesive bridge with the modified slot-back dummy showed higher dislodgement resistance compared to the traditional adhesive bridge and the adhesive bridge with the slot-back dummy.