Abstract
Background: Provisional fixed prostheses serve as intermediate-stage prostheses for short or long periods of time until definitive restorations are fabricated and placed in the oral cavity. The mechanical strength of a provisional fixed prosthetic material is crucial for the
integrity of the restoration because it is required to withstand the functional loads in the mouth. Aim: The aim of this study was to compare the flexural strength, nanohardness, and elastic modulus of CAD-CAM restorations with those of conventional provisional fixed prosthetic materials
In Vitro. Materials and methods: Ten cylindrical specimens were created from four fixed prosthetic materials (two conventional acrylic resins and two CAD/CAM-milled resins). The flexural strength, nanohardness, and elastic modulus of the materials were tested and compared. Significant
differences in the means among the groups were analyzed using one-way analysis of variance and Bonferroni's post hoc test. Results: Significant differences (p < 0.05) in the flexural strength, nanohardness, and elastic modulus were observed between the conventional acrylic
resins and the CAD/CAMmilled resins. Similarly, significant differences in the three parameters were observed between the two CAD/CAM-milled resins (p < 0.05). No significant differences in the nanohardness or elastic modulus were observed between the two conventional resins. Conclusions:
CAD/CAMmilled fixed prosthetic materials demonstrated superior properties compared to conventional materials.