Fitting accuracy of zirconia single crowns produced via digital and conventional impressions—a clinical comparative study

Abstract

The clinical precision of fit of restorations produced with a CI and an IS technique appeared to be equivalent. Therefore, the IS technique can be rated as a suitable alternative for the manufacturing of single crowns.

A clinical comparison of digital and conventional impression techniques regarding finish line locations and impression time

“…This value was 71.67 μ in a study by Sakornwimon and Leevailoj . Some other clinical studies that used Trios 3Shape reported higher values of marginal gap compared to our results. The reason may be that they did not clinically adjust the restorations while we adjusted the internal surface of copings prior to the fabrication of replica to better simulate the clinical setting.…”

“…Difference in parameters such as the considered cement space, which was 40 μ in our study and 50 μ in the study by Berrendero et al, can also explain the difference in the results. Some clinical studies reported greater marginal gap compared to our values, which may be attributed to the different types of restorations. According to Pak et al, addition of porcelain to coping caused distortion and decreased the fit of restorations.…”

“…The overall size of internal gap in our study agreed with that in many clinical studies . Our value was lower than that reported in some other studies, which may be due to the use of coating powder spray before scanning in some digital systems such as Lava C.O.S. The thickness of this layer, could affect the restoration fit .…”

“…Many in vitro and clinical studies have evaluated and compared the accuracy of digital and conventional impressions and restorations . In these studies, although finish lines in some teeth were extended subgingivally, the effect of finish line position on the results was not considered . To the best of the authors' knowledge, no previous study has compared the accuracy of conventional and digital impressions for fabrication of tooth‐supported restorations with subgingival and supragingival finish lines.…”

Fracture resistance of all‐ceramic crowns based on different preparation designs for restoring endodontically treated molars

“…All ceramic, CAD/CAM full coverage restorations are becoming increasingly popular as this method provides expedient prosthesis fabrication with acceptable marginal accuracy . Compared to traditional laboratory‐fabricated cast restorations, CAD/CAM‐generated restorations rely more on adhesive technology, which proponents claim can compensate for loss of traditionally recommended preparation features .…”