Fracture Strength of Three-Unit Implant Supported Fixed Partial Dentures with Excessive Crown Height Fabricated from Different Materials

Vahideh Nazari, Safoura Ghodsi, Marzieh Alikhasi, Majid Sahebi, Ahmad Reza Shamshiri, Vahideh Nazari, Safoura Ghodsi, Marzieh Alikhasi, Majid Sahebi, Ahmad Reza Shamshiri

Abstract

Objectives: Fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (CHS). The purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (FPDs) with excessive crown height, fabricated from three different materials.

Materials and methods: Two implants with corresponding abutments were mounted in a metal model that simulated mandibular second premolar and second molar. Thirty 3-unit frameworks with supportive anatomical design were fabricated using zirconia, nickel-chromium alloy (Ni-Cr), and polyetheretherketone (PEEK) (n=10). After veneering, the CHS was equal to 15mm. Then; samples were axially loaded on the center of pontics until fracture in a universal testing machine at a crosshead speed of 0.5 mm/minute. The failure load data were analyzed by one-way ANOVA and Games-Howell tests at significance level of 0.05.

Results: The mean failure loads for zirconia, Ni-Cr and PEEK restorations were 2086±362N, 5591±1200N and 1430±262N, respectively. There were significant differences in the mean failure loads of the three groups (P<0.001). The fracture modes in zirconia, metal ceramic and PEEK restorations were cohesive, mixed and adhesive type, respectively.

Conclusions: According to the findings of this study, all implant supported three-unit FPDs fabricated of zirconia, metal ceramic and PEEK materials are capable to withstand bite force (even para-functions) in the molar region with excessive CHS.

Keywords: Dental Implants; Dental Porcelain; Dental Restoration Failure; Polyetheretherketone; Zirconium Oxide.

Figures

Fig. 1:
Fig. 1:
Mounted implants parallel to each other using a surveyor
Fig. 2:
Fig. 2:
Position of stainless steel ball and Teflon disk at loading point
Fig. 3:
Fig. 3:
Examples of a fractured FPD (left to right: zirconia, metal ceramic and PEEK restorations)

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Source: PubMed

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