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Marginal accuracy and internal fit of copings by the digital impression and CAD-CAM systems
EAO Online Library. Lee S. Oct 9, 2018; 232505
Sanghoon Lee
Sanghoon Lee
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Digital impression systems have been developed to overcome the disadvantages associated with conventional impression methods while, the computer-aided design computer-aided manufacturing (CAD CAM) technology in dentistry have been replaced error-prone manual laboratory steps with aligned industrial manufacturing processes. Therefore, the combination of them can be time-saving, comfortable, and cost-effective compared to conventional impression and casting technology. The purpose of this study was to compare the marginal fit and internal fit of metal and zirconia copings obtained with the use of an iTero digital impression and two different CAD-CAM systems in the anterior, premolar and molar teeth with chamfer or shoulder margin. A typodont model with prepared metal tooth was used as the master model. For the conventional impression group, base metal dies were replicated as stone dies by means of a conventional impression technique with polyvinyl siloxane material. For the digital impression, base metal dies were replicated as polyurethane dies with the iTero system. For the zirconia copings by CerconⓇ+ and ArumⓇ+ CAD-CAM systems, stone and polyurethane dies were scanned and CAD-CAM milled. For gold and Empress copings, wax-up and casting procedures were performed based on the stone and polyurethane dies. The marginal gap and internal fit of each specimen were measured after manual refinement with a light microscope and silicone weight technique. One-way ANOVA and the Scheffe’s test were used for statistical analysis (P<.05).There was no significant difference in the marginal gap among four different groups of copings between digital and conventional impression regardless of the tooth location and type of finish line (p>0.05). However, statistically significant differences in the silicone weight for internal fit were found between the casting groups and CAD-CAM groups (P<.05).The internal fit between the copings and definitive base metal die was greater in the groups that used the digital impression method and CAD-CAM systems in the group that used the conventional impression and casting method. However, the marginal discrepancies of all of the groups were no difference and clinically acceptable.
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