Evaluation of Mechanical, Physical and Optical Properties of Indirect Restorations Prepared with Different Manufacturing Techniques

Project no. 23202 · Status: Kapanmış · 2022

Summary

Introduction: Aim of this study is to investigate the mechanical, physical and optic properties of onlay restorations produced using additive manufacturing technique.Methods: Class II (MOD) cavities were prepared on sixty mandibular molar teeth separated into 3 groups using different manufacturing methods: Additive, subtractive and conventional manufacturing. All samples were imaged with micro-CT to evaluate marginal adaptation and void volumes. Micro-shear test was performed before and after thermo-cycling. Shade values of restorations were measured with spectrophotometer after finishing/polishing and thermos-cycling processes to determine optical properties. Data were analyzed using Kolmogorov-Smirnov, one-way variance (ANOVA), post-hoc Tukey, student-t and chi-square tests.Results: The marginal fit values measured for onlay restorations produced with 3D printing and other groups were at clinically acceptable levels (<120 μm) and no significant difference was observed between the three different manufacturing methods (p>0.05). According to the micro-shear bonding test results, the CS group exhibited the highest bond strength before (34.82 MPa) and after (26.87 MPa) thermal cycling (p<0.05), while the 3D group showed an increase in bond strength after thermal cycling (9.05%). When the optical properties were examined, the least color change after polishing was observed in the CS group (∆E=2.93), while the highest change after thermal cycling was observed in the SG group (∆E=12.04) (p<0.05).Conclusions: The physical and optical properties of 3D-printed restorations were improved compared to traditional resin composites. However, the bond strengths of 3D dental materials are directly proportional to the degree of polymerization of the material. Although the success of 3D restorations is promising, these findings need to be confirmed with additional clinical research and studies.

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