Comparison of the Failure Between Conventional PMMA and Milled PMMA Full Arch Maxillary Interim Prosthesis Fixed on 4 Implants: An In Vitro Study

Authors

• Tatiana Bou Sakr, Saint Joseph University of Beirut, LebanonFollow
• Hani Tohme, Saint Joseph University of Beirut, LebanonFollow
• Natalia Bou Sakr, Saint Joseph University of Beirut, LebanonFollow
• Victor Ghoubril, Saint Joseph University of Beirut, LebanonFollow
• Carole Abi Ghosn Yared, Saint Joseph University of Beirut, LebanonFollow

Abstract

Objectives: The principal objective of this study was to compare the failure load between the conventional heat polymerized PMMA and the CAD/CAM milled PMMA interim full arch implant prostheses. The secondary aim was to evaluate the success of the distal extension of the temporary PMMA prosthesis.

Methods: A metallic edentulous upper arch model with 4 Straumann screw-retained abutment digital analogs was used to create 15 specimens for each of the 2 groups: Conventional and milled. Failure load was measured on 5 different regions on the left and right side of each specimen with the YLE universal testing machine: Anterior, premolar, and molar.

Results: The maximum force supported before breaking was noted for each region (N). The medians of failure load were statistically analyzed. Significant differences were observed between the 2 groups and among each region in the 2 groups. The posterior cantilever was the weakest sector in both groups followed by the anterior then the premolar regions.

Conclusions: The interim milled PMMA prosthesis are a better choice due to their improved mechanical stability.

Recommended Citation

Bou Sakr, Tatiana; Tohme, Hani; Bou Sakr, Natalia; Ghoubril, Victor; and Abi Ghosn Yared, Carole (2024) "Comparison of the Failure Between Conventional PMMA and Milled PMMA Full Arch Maxillary Interim Prosthesis Fixed on 4 Implants: An In Vitro Study," International Arab Journal of Dentistry: Vol. 15: Iss. 1, Article 16.
DOI: https://doi.org/10.70174/iajd.v15i1.969
Available at: https://e-journals.usj.edu.lb/iajd/vol15/iss1/16