Citation Information :
Bhambhu S, Sahni S, Padiyar N, Kaurani P. Comparison of Fracture Resistance of Three-unit Provisional Fixed Dental Prostheses Fabricated Using Conventional and Digital Methods. Int J Prosthodont Restor Dent 2022; 12 (2):59-63.
Purpose: To compare the fracture resistance of three-unit (3-unit) provisional fixed dental prostheses (FDPs) fabricated using conventional, computer-aided design and computer-aided manufacturing (CAD/CAM) and three-dimensional (3D) printing methods.
Materials and methods: Mandibular right second premolar and second molar typodont teeth were prepared and a metal die was fabricated. Five specimens of each 3-unit FDP were fabricated using self-cure (conventional), with 3D printing and CAD/CAM techniques. Specimens were placed on the universal testing machine and subjected to an axial load. The maximum force which led to the fracture of the FDP was recorded. Tukey's test for pairwise comparison of fracture strength was used and a one-way analysis of variance (ANOVA) was used for intergroup.
Results: Maximum fracture resistance was seen in the CAD/CAM group (2510.3 N), followed by 3D printed (2182.9 N), and least in the self-cure group (1940.9 N). ANOVA for intergroup comparison showed a statistically significant difference in fracture resistance between the three groups (p < 0.001). A statistically significant difference in fracture resistance via post hoc Tukey's was seen in group I and group II (p < 0.001), and between group II and group III (p = 0.015). There was no significant difference found in between group I and group III (p > 0.05).
Conclusion: Computer-aided design and computer-aided manufacturing milled and 3D printed 3-unit provisional FDP showed significantly better fracture resistance compared to the conventional FDP. Interim restorations fabricated using these advanced techniques provide stronger, more reliable, and conservatively produced provisional restorations.
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