Flexural Strength of Maxillary Premolar Restored with Resin-bonded IPS e.max CAD Ceramic Cantilever Bridge in Different Retention-form Design

doi:10.13701/j.cnki.kqyxyj.2022.12.013

Abstract

Abstract: Objective: To study the influence of different retention form designs on the fracture resistance of resin-bonded IPS e.max CAD ceramic cantilever bridge for maxillary premolars. Methods: Thirty intact adult maxillary premolars were selected and divided into three groups randomly (n=10). Group A: single-retainer of occlusal rest; group B: single-retainer of D-shape; and group C: single-retainer covering the palatal cusp. Prostheses were fabricated with IPS e.max CAD blocks and then cemented with resin cement. Fracture strength and failure mode were tested in a universal testing machine. Results: The fracture strength of group A, group B, and group C were (269.91±69.49) N, (279.79±35.21) N, and (394.33±88.37) N. The fracture strength of group B was higher than that of group A, but the difference was not significant (P>0.05). Group C had significantly higher fracture strength than groups A and B (P<0.01). The predominant failure mode was connector fracture. Conclusion: All three types of resin-bonded cantilever bridges can meet clinical requirements. The design of single-retainer covering the palatal cusp exhibited promising fracture properties.

Key words: resin-bonded cantilever bridge, retention form, all-ceramic, fracture load

LI Meikang, HAN Bitan, WANG Xueqian, CHEN Zhiyu, AN Yilin, MA Xiaoping. Flexural Strength of Maxillary Premolar Restored with Resin-bonded IPS e.max CAD Ceramic Cantilever Bridge in Different Retention-form Design[J]. Journal of Oral Science Research, 2022, 38(12): 1167-1170.

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