Abstract
The objective of this study was to demonstrate the feasibility of using micro-CT scan of dental impressions for fabricating dental restorations and to compare the dimensional accuracy of dental models generated from various methods. The key idea of the proposed protocol is that dental impression of patients can be accurately digitized by micro-CT scan and that one can make digital cast model from micro-CT data directly. As air regions of the micro-CT scan data of dental impression are equivalent to the real teeth and surrounding structures, one can segment the air regions and fabricate digital cast model in the STL format out of them. The proposed method was validated by a phantom study using a typodont with prepared teeth. Actual measurement and deviation map analysis were performed after acquiring digital cast models for each restoration methods. Comparisons of the milled restorations were also performed by placing them on the prepared teeth of typodont. The results demonstrated that an efficient fabrication of precise dental restoration is achievable by use of the proposed method.
Highlights
Dental restoration is the repairing process of a damaged tooth, restoring it back to its normal appearance and function
We performed a phantom study using a typodont with prepared teeth and demonstrated that efficient fabrication of precise dental restoration is achievable by use of the proposed method
This study investigated the feasibility and accuracy of the micro-CT based dental restoration method for the first time to the best knowledge of the authors
Summary
Dental restoration is the repairing process of a damaged tooth, restoring it back to its normal appearance and function. Restorations may be directly fabricated through the computer-aided design and computer-aided manufacturing using the digital impression, enabling the restoration of the damaged tooth in a single visit Another workflow for crown or inlay restorations is to take a digital impression, transfer the scan data electronically, and fabricate the physical master cast model and the restorations in dental laboratory, which eliminates the need for the conventional impression and manual fabrication of master cast stone model[8,9]. We would like to note that, due to the anatomy of the natural dentition, dental impressions may bear undercuts of which the optical scanner cannot capture the surface data accurately As both digital impressions by scanning extraorally and intraorally have their cons and pros, a precise and convenient digital impression method for dental restoration is still desirable, which can mitigate the shortcomings and maximize the merits of each method. We performed a phantom study using a typodont with prepared teeth and demonstrated that efficient fabrication of precise dental restoration is achievable by use of the proposed method
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