TITLE:
Comparison of the Flexural Strength and Elastic Modulus of Conventional, Milled and 3D-Printed Interim Restorative Materials Subjected to Different Intervals of Accelerated Aging
AUTHORS:
Ala’a I. Abu-Obaid, Alanoud M. Alotaibi, Alanoud F. Binmeqren, Raghd A. Albarrak, Maram S. Albaqami, Abdullah S. Alshahrani
KEYWORDS:
Interim Restoration, CAD/CAM Milled, 3D-Printing, Flexural Strength, Elastic Modulus, Accelerated Aging
JOURNAL NAME:
Open Access Library Journal,
Vol.11 No.8,
August
26,
2024
ABSTRACT: 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 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.