Journal of Prosthodontics News
Effect of Artificial Aging on Optical Properties and Crystalline Structure of High-Translucency Zirconia
Now online in the Journal of Prosthodontics, an original research article co-authored by ACP Fellows, Hongseok An DDS, MSD, FACP and John A. Sorensen DMD, PhD, FACP.
When crowns are fabricated using a digital workflow, intraoral scans may be preferred to conventional impressions because they are less time consuming and more patient friendly. This in vitro study evaluated the influence of finish line location and saliva contamination on the scanning trueness of crown finish lines.
Three ivorine teeth were prepared for all-ceramic crowns with finish lines placed equigingivally, 0.5 mm subgingivally, and 1.0 mm subgingivally. A single-cord technique was used for gingival retraction, and a total of 180 intraoral scans were made using two intraoral scanners (Trios 3 and Emerald).
For both intraoral scanners, subgingival finish line groups showed greater vertical and horizontal discrepancies compared with equigingival finish line groups. Saliva contamination significantly increased both vertical and horizontal discrepancies for all finish line locations.
Within the limitations of the study, the results showed that equigingival finish lines were scanned with clinically acceptable trueness. Subgingival finish lines were not accurately captured using the intraoral scanners.
An, H, Mickesh, GJ, Cho, D, Sorensen, JA. Effect of finish line location and saliva contamination on the accuracy of crown finish line scanning. J Prosthodont. 2023; 1– 9. https://doi.org/10.1111/jopr.13658
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