Comparison of the Flexural Strength and Elastic Modulus of Conventional, Milled and 3D-Printed Interim Restorative Materials Subjected to Different Intervals of Accelerated Aging
Aim: To compare the flexural strength and elastic modulus of different interim restorative materials subjected to different intervals of accelerated aging. Materials and Method: Three groups of interim restorative materials (N = 120) were prepared using three different manufacturing techniques: conventional PMMA resin (Jet Tooth Shade), computer-aided design/computer-aided manufacturing (CAD/CAM) milled resin blocks (Telio CAD), and three-dimensional (3D) printed resin (Crown & Bridge NextDent). The specimens from each group were subdivided into four equal subgroups (n = 10) and subjected to accelerated aging through thermocycling and brushing according to different time intervals of aging (baseline, 3 months, 6 months, and 12 months). The flexural strength and elastic modulus were measured using a three-point bending test. The data were analyzed using two-way analyses of variance (ANOVA), one-way ANOVA, and Tukey’s post hoc test at a significance level of 0.05. Results: At baseline, the flexural strength and elastic modulus were significantly greater in the CAD/CAM milled group (p < 0.05) than in the conventional and 3D-printed groups. However, no significant difference in flexural strength was observed between the conventional and 3D-printed groups. However, a significant difference (p < 0.05) in the elastic modulus was observed between the conventional and 3D-printed groups. At all aging intervals (3, 6 and 12 months), the flexural strength and elastic modulus were significantly greater (p < 0.05) in the CAD/CAM milled group than in the conventional group and the 3D-printed group. Within each material tested, the baseline group had significantly greater values (p < 0.05) than did the other age groups. However, there was no significant difference observed among the age intervals of 3, 6, and 12 months, except for the CAD/CAM milled group. In the 12-month aging group, a significant difference (p < 0.05) in the elastic modulus was found; no significant difference (p < 0.05) was observed between the 3 and 6-month aging groups. Conclusion: The CAD/CAM milled group consistently outperformed the conventional and 3D-printed groups in all age intervals. Therefore, the CAD/CAM milling technique could be recommended for long-term temporization for patients with increased occlusal forces, such as parafunctional habits, or for full-arch implant-supported interim prostheses.
Cite this paper
Abu-Obaid, A. I. , Alotaibi, A. M. , Binmeqren, A. F. , Albarrak, R. A. , Albaqami, M. S. and Alshahrani, A. S. (2024). Comparison of the Flexural Strength and Elastic Modulus of Conventional, Milled and 3D-Printed Interim Restorative Materials Subjected to Different Intervals of Accelerated Aging. Open Access Library Journal, 11, e1959. doi: http://dx.doi.org/10.4236/oalib.1111959.
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