Comparative Analysis of Fracture resistance and Fracture mode in Zirconia Restorations Supported by Different Abutment Designs: An In Vitro Study
DOI:
https://doi.org/10.32828/mdj.v22i1.1251Keywords:
Implant-supported zirconia crowns, Hybrid abutment crowns, Titanium base, Fracture resistance, Failure modeAbstract
Background: The effectiveness of implant-supported restorations largely relies on their capacity to resist functional forces. To enhance the mechanical performance of zirconia restorations, different abutment designs have been developed and are currently in use. Aim: This study aimed to evaluate the fracture resistance and fracture modes of implant-supported zirconia crowns fabricated with different abutment configurations after artificial aging. Materials and Methods: 36 implant analogs were arbitrarily assigned to three groups (n = 12). Group A: one-piece hybrid abutment crowns (HAC). Group B: Two-piece restorations hybrid abutment with a separate crown. Group C: stock titanium abutments with crown. Artificial aging was applied to all specimens (500 thermo-cycle and 120,000 mechanical cyclic). The fracture resistance was assessed by a universal testing machine, the fracture modes were evaluated under (SEM) at ×30, ×300, and ×5000 magnifications. Results: Group A showed the highest fracture resistance mean (2243.2 ± 234.2N), Group B recorded the lowest value (1819.6 ±173.2 N). The difference among the groups was statistically significant (P < 0.05). SEM analysis revealed different fracture morphologies in the three different groups. Conclusion: The one-piece restoration revealed highest fracture resistance. However, the fracture resistance values in the different designs were higher than the average masticatory forces in the premolar teeth, supporting their potential for clinical use.
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