BOND STRENGTH ASSESSMENT OF SINGLE VERSUS DOUBLE ARM POSTERIOR RESIN-BONDED BRIDGE

Document Type : Original Article

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Fixed Department, Faculty of Dentistry, Cairo University, Cairo, Egypt

Abstract

Objective: This study aimed to evaluate the bond strength of single versus double arm posterior resin-bonded bridge.
Materials and Methods: Fifteen sound human lower molars and lower premolars freshly extracted were chosen, then cleaned and stored in distilled water before preparation. Samples were embedded in self-cure acrylic resin to construct models with an edentulous space of premolar width. Abutment teeth were prepared as lingual coverage and divided according to retainer design: single arm (n=5) and double arm (n=5). Restorations were milled from monolithic zirconia (KATANA Zirconia HTML PLUS) and were adhesively bonded using dual-cure resin cement. The specimens were examined for a retention test utilizing a universal testing machine that applies one or two wire loops in order to perform a debonding test.
Results: Bond strength in both the Single Arm and Double Arm Posterior Resin Bonded Bridge groups. In the Single Arm group, the bond strength values ranged from 60.80 to 85.07 N, indicating relatively low variability within this group. Conversely, the Double Arm group demonstrated substantially higher bond strength values, ranging from 361.17 to 552.84 N, reflecting a wider spread of bond strength values in this group using the Shapiro-Wilk and Kolmogorov normality tests, which exposed that all data originated from normal data distribution. Consequently, comparison between groups was accomplished independent t-test. The significance level was set at p ≤ 0.05 within all tests.
Conclusion: The double-arm posterior resin-bonded bridge withstood higher debonding forces than the single-arm resin-bonded bridge. However, single arm is still an alternative option.

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Ahram Canadian Dental Journal
Volume 4, Issue 3
July 2025
Pages 197-215

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