Abstract
Digital impressions have been studied for better gingival retraction in including the under subgingival finish line condition. Here, we employed swept-source optical coherence tomography (SS-OCT) of 1310 nm wavelength, which is capable of noninvasive, high-resolution, and high-speed, to discern the utilization-possibility for supporting the fabrication of the dental crown. A three-dimensional (3D) abutment was used at the 0.5 mm of the subgingival finish line below the level of the gingiva. The SS-OCT system scanned a field of view of 10 mm × 10 mm using the 3D working model by the depth-directional three focal points. The obtained 1500 images of OCT cross-sections, which are 1221 × 1220 pixels, were rendered to the 3D model for the effective design of a virtual crown. Then, the ceramic crown was fabricated through a milling machine with a computer-aided design and computer-aided manufacturing (CAD/CAM) software. The marginal fit of the crown was evaluated 219.1 ± 48.9 μm by a silicone replica technique. Although the marginal fit is not sufficient for the clinical allowable gap at one resin typodont, this study can be anticipated to encourage further researches for the enhanced fabrication of dental crown under subgingival finish line conditions.
Highlights
Development of computer graphics has led to various applications of the computer-aided design and computer-aided manufacturing (CAD/CAM) system
The Optical coherence tomography (OCT) technique, which is capable of providing a noninvasive cross-sectional image with tomographic information, has a more high-resolution of several micro-scales compared to the intraoral scanners [39]
The aim of this study is to show the utilization possibility of the swept-source optical coherence tomography (SS-OCT) system to scan the 3D model of abutment for the fabrication of dental crown under the subgingival finish line condition
Summary
Development of computer graphics has led to various applications of the computer-aided design and computer-aided manufacturing (CAD/CAM) system. In the field of dentistry, CAD/CAM is used for planning and manufacturing dental restorations [1]–[4]. Restorations using dental CAD/CAM have been accomplished with digital impressions. By measuring the geometric shapes of the tooth in three dimensions using a dental scanner and converting the measurements into digital data [8]–[10]. Dental scanners have been used both as contact and noncontact types. Nowadays, noncontact-type scanners based on optical scanner are basically used in dentistry [13]–[15]. Complete workflows of fixed prosthesis with digital impressions are established using the intraoral scanner [16]–[18]. Most commercial intraoral scanners allow scanning of only the tooth surface due to the optical scanner types.
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