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Materials and Methods: This in vitro, experimental study evaluated 20 endocrowns, of which 10 were fabricated by 3D printing and 10 were fabricated by the conventional wax-up technique. The marginal gap was measured at 8 points under a stereomicroscope. The results were analyzed using the Shapiro–Wilk test, paired t-test, independent t-test, and one-way analysis of variance (α = 0.05). Results: The mean marginal gap was maximum at the distal point, and minimum at the buccal point for the conventionally fabricated endocrowns with an overall mean marginal gap of 99.67 ± 4.59 μm. The mean marginal gap was maximum at the mesiobuccal and minimum at the buccal point before pressing (overall mean of 103.92 ± 2.19 μm) before pressing, and maximum at the distobuccal and minimum at the mesiobuccal point after pressing (overall mean of 117.67 ± 2.87 μm). According to paired t-test, the mean marginal gap of endocrowns fabricated by 3D printing significantly increased after pressing at all 8 points and also in general, compared with before pressing (P < 0.001). Furthermore, the mean marginal gap at all points was significantly greater in endocrowns fabricated by 3D printing compared with those fabricated by the conventional method (independent t-test, P < 0.001). Conclusion: Within the limitations of this in vitro study, the results showed that endocrowns fabricated by the conventional method had significantly superior marginal fit than those fabricated by 3D printing. Background: Marginal fit is a key factor in success of prosthetic restorations. This study aimed to assess and compare the marginal fit of endocrowns fabricated by three-dimensional (3D) printing and the conventional method.

Introduction: Marginal adaptation is one of the key factors in the success of dental crowns. It is necessary to identify marginal adaptation in order to determine the spacing and prevent the onset of diseases. This study sought to use 3D and manual printing methods aiming at manufacturing heat press full-coverage extra-coronal restorations with more marginal adaptation. Materials & Methods: This study was conducted in the year 1397-98 at the Islamic Azad University of Isfahan using descriptive-analytical and cross-sectional method with 20 samples. Ten samples were evaluated using a 3D printing method, and ten samples were assessed by manual wax-up technique. Results were analyzed using Kruskal-Wallis and Mann-Whitney tests. Results: There was a significant difference between the restoration space and the marginal edges in eight parts of the teeth in the manual method (p value < 0.001). The marginal edge space in the eight parts of the tooth was not significantly different in the 3D print method (p value = 0.614). A significant difference was observed in restoration space and the marginal edge between 3D printing and manual techniques (p value < 0.001). Conclusion: The compatibility of the complete outer crowns of the heat press in the 3D printing method was not significantly different from the manual waxing method.