Comparison of the failure between conventional PMMA and milled PMMA full arch maxillary interim prosthesis fixed on 4 implants: An In Vitro Study
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Vol 15 No 1 (2024), Original Article
Vol 15 No 1 (2024)

Comparison of the failure between conventional PMMA and milled PMMA full arch maxillary interim prosthesis fixed on 4 implants: An In Vitro Study

Original Article
Published 3 May 2024
Tatiana BOU SAKR
Department of Removable Prosthodontics, Faculty of Dental Medicine, Saint-Joseph University of Beirut, Beirut, Lebanon
Hani TOHME
Department of Digital Dentistry, Artificial Intelligence and Evolving Technologies, Faculty of Dental Medicine, Saint Joseph University of Beirut, Beirut, Lebanon
Natalia BOU SAKR
Mathematics and Applications Laboratory, Mathematics and Modeling Research Unit, Faculty of Sciences, Saint Joseph University of Beirut, Beirut, Lebanon
Victor GHOUBRIL
Department of Orthodontics, Faculty of Dental Medicine, Saint-Joseph University of Beirut, Beirut, Lebanon
Carole ABI GHOSN
Department of Removable Prosthodontics, Faculty of Dental Medicine, Saint-Joseph University of Beirut, Beirut, Lebanon
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Keywords

All-on-4
CAD/CAM
Cantilever
Conventional
Immediate loading
Interim implant fixed prosthesis
Polymethyl methacrylate
Provisional

How to Cite

BOU SAKR , T., TOHME , H., BOU SAKR , N., GHOUBRIL , V., & ABI GHOSN, C. (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 (IAJD), 15(1), 155-167. Retrieved from https://journals.usj.edu.lb/iajd/article/view/969
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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.

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