Abstract
Background Accurate fit is one of the most important factors in the long term clinical outcomes of fixed dental prostheses. Therefore, evaluation of restorations fabricated by new technologies is needed. However studies comparing marginal and internal adaptations of the several CAD CAM systems are few. Aim/Hypothesis The aim of this in vitro study is to compare the marginal and internal fit of conventional casting metal copings, milling metal copings, milling zirconia copings, 3D printing metal copings. Material and Methods Each ten specimens were fabricated with casting Co-Cr alloy (CC), milling Co-Cr alloy (CS), milling zirconia (CZ), 3D printing Co-Cr alloy (EC). The marginal and internal gaps of the copings were measured using a replica technique with a light-body silicone impression material. The replica specimens were sectioned buccopalatally and mesiodistally and then examined using a microscope at 200× magnification. Sixteen reference points were used on each specimen. The data were statistically analyzed with One-way ANOVA and Scheffe significant difference tests (P > 0.05). Results The mean marginal fit of CC group was significantly better than other three groups. The mean internal gap of CC group was significantly smaller than those of groups. In all groups, the marginal mean values were the smallest among locations. Conclusions and Clinical Implications Within the limitations of this in vitro study, the marginal and internal fit of CC group were significantly better than those of CS, CZ and EC group. However CS, CZ and EC group fabricated by CAD CAM presented enough accuracy in the marginal and internal gap.
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