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Purpose: The aim of this study is to evaluate the side and interior compatibility of the crone and inley restorations produced directly (internal browsers) and indirectly (internal browsers) digital technology and to compare the restorations produced using computer-backed design and computer-backed production (CAD/CAM) with traditional technology. The tool and method: The first big little fantom teeth were used for the production of the crown and inley restorations of the mandibus right and left. The study contains 9 groups and 90 samples, including 6 groups of crowns (n=10), 3 groups of inleys (n=10). In the production of both restoration types, direct digital, indirect digital and traditional methods were used. Replica technique was used to assess the boundary and internal surface conformity of the samples, and the measurements were carried out under a 50x enlarged stereomicroscope. Statistical assessment was carried out by one-way variance analysis and repeated measurements by variance analysis methods, while in group comparisons Tukey HSD and Tamhane's T2 tests were used (p<0,05). Results: According to the results obtained, the boundary and internal surface compatibility values have been shown to be influenced by measurement and production technique. Direct digital technology, indirect digital technology and traditional methods have given results to both restoration groups. It has been found that the internal surface range values obtained in all groups are higher than the boundary range values (p<,001). Result: Within the limits of the study, the boundary and internal compatibility of the crown and inley restorations obtained by direct digital means is statistically better than the restorations produced by indirect digital and traditional methods. Keywords: CAD/CAM, inley, chronic, replica techniques. Evaluation of the effect of computer aided design- computer aided manufacturing systems on marginal and internal fit of different dental restorations: An in-vitro study ABSTRACT Aim: The aim of this study was to evaluate the marginal and internal fit of crown and inlay restorations that produced with direct (intra-oral scanner) and indirect (extra-oral scanner) digital methods and compare the computer-aided design and computer-aided manufacturing (CAD / CAM) restorations with conventional ones. Material and Methods: Mandibulary right and left first molar phantom teeth were used to produce the crown and inlay restorations. In total, there were 9 groups and 90 samples in the study, including 6 groups of crowns (n = 10) and 3 groups of inlays (n = 10). Direct digital, indirect digital and traditional methods were used in the production of both restoration types. Replica technique was used to evaluate the marginal and internal fit of the samples, and the measurements were performed under a 50x magnification stereomicroscope. One-way analysis of variance and repeated measures of variance analysis were performed for statistical evaluation, and Tukey HSD and Tamhane's T2 tests were used for comparisons between groups (p <0.05). Results: According to the obtained results, marginal and internal fit values were influenced by impression and production technique. Direct digital technique gave the best results in both restoration groups compared to indirect digital technique and the conventional method. Internal gap values obtained in all groups were found to be higher than marginal gap values (p <.001). Conclusion: Within the limitations of the study, marginal and internal fit values of the crown and inlay restorations obtained with direct digital method were statistically better than the restorations produced by the indirect digital and conventional methods. Keywords: CAD/CAM, inlay, crown, replica techniques.

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