Related Experiment Video
Updated: Aug 3, 2026

Oral Biofilm Formation on Different Materials for Dental Implants
Published on: June 24, 2018
Effect of pick-up material and hole diameter on the flexural strength of milled polymethyl methacrylate complete arch
Maryse Nassif1, Ghida Lawand2, Marta Revilla-León3
1Postgraduate student, Department of Prosthetic and Esthetic Dentistry, Faculty of Dental Medicine, Saint Joseph University of Beirut, Beirut, Lebanon.
Statement Of Problem:
Milled polymethyl methacrylate (PMMA) has been widely used to fabricate complete arch immediate implant-supported fixed interim prostheses. However, the effect of the pick-up material and hole diameter of the restoration on its flexural strength and failure mode remains unclear.
Purpose:
The purpose of this in vitro study was to assess the impact of the pick-up material and hole diameter of the interim restoration on the flexural strength and failure mode of milled complete arch immediate implant-supported interim restorations.
Material And Methods:
A master model block simulating an edentulous ridge with implants was designed and printed in cobalt chromium, and 2 implant screw-retained abutment analogs were embedded in the block. A bar simulating the implant-supported fixed prosthesis was designed. A total of 64 PMMA bars (21.5×10×8 mm) were milled and divided into 2 groups based on capture hole diameter (4.8 or 5.8 mm) and 4 subgroups based on pick-up material: autopolymerizing PMMA (Unifast Trad Ivory) (aPMMA group) (n=16), autopolymerizing resin (Quick Up) (aRES group) (n=16), dual-polymerizing PMMA resin (Stellar DC Acrylic) (dPMMA group) (n=16), or flowable light-polymerizing composite resin (Filtek Bulk Fill Flowable) (bfRES group) (n=16). The bar specimens were screwed into the abutment analogs and subjected to 3-point bending in a universal testing machine. Flexural strength was calculated, and failure mode was assessed. Flexural strength data was analyzed using a 2-way ANOVA with Bonferroni post hoc tests (α=.05). Failure mode was evaluated with the Fisher exact test.
Results:
Flexural strength was significantly influenced by both the pick-up material and capture hole diameter (P=.001). The aPMMA (P<.001) subgroup showed higher flexural strength across diameters, while the performance of bfRES (P=.001) and dPMMA (P<.001) was reduced at 5.8 mm. The aPMMA subgroup primarily failed cohesively, while dPMMA showed predominantly adhesive failures. Larger coping capture hole diameters led to a significant increase in adhesive failures (P=.008).
Conclusions:
The pick-up material and coping capture hole diameter were found to affect the flexural strength of milled PMMA interim implant-supported prosthesis. Autopolymerizing PMMA demonstrated higher mechanical properties and more favorable failure patterns.
More Related Videos
07:42Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
03:02Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins
Published on: January 17, 2025
Related Concept Videos
Stress-Strain Diagram - Ductile Materials
Plastic Behavior
Bending of Members Made of Several Materials
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Members Made of Elastoplastic Material
As the bending moment...
Residual Stresses in Bending
Strength of Cement
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in ASTM C...