The lateral cephalogram-based mandibular digital dental cast superimposition was achieved by sequential maxillary dental cast superimposition registered on the palatal stable region, occlusal transfer, and adjustment of mandibular rotation and translation obtained from lateral cephalogram superimposition. The plaster dental casts were transferred to digital dental casts by 3D laser scanning, and lateral cephalograms were created from the craniofacial CBCT scans by orthogonal projection. The pre- and post-treatment plaster dental casts and craniofacial CBCT scans were obtained. All the patients had four first premolars extracted, and were treated with straight wire appliance. Fifteen post-extraction orthodontic treatment adults from the Department of Orthodontics, Peking University School and Hospital of Stomatology were included. To explore a cone beam computed tomography (CBCT)-independent method for mandibular digital dental cast superimposition to evaluate three-dimensional (3D) mandibular tooth movement after orthodontic treatment in adults, and to evaluate the accuracy of this method. This novel method allows for the integration of digital dental casts into CBCT scans, overcoming problems such as unwanted extra radiation exposure, distortion of soft tissues due to the use of bite jigs, and time-consuming digital data handling. After matching the two datasets, the average distance between the corresponding markers was 0.1 mm. The two datasets were matched, and the dentition derived from the scanned impressions was transferred to the CBCT of the patient. The impressions were scanned, and all CBCT datasets were exported in DICOM format. During the impression-taking procedure, the titanium markers were transferred to the impression. Next, a CBCT scan and dental impressions were made. In a patient scheduled for orthognathic surgery, titanium markers were glued to the gingiva. The aim of this feasibility study is to present a new simplified method to integrate digital dental casts into CBCT scans. Several authors have described methods to integrate digital dental casts into CBCT scans, but all reported methods have drawbacks. The CBCT image of the dental arches, however, is of insufficient quality to use in digital planning of orthognathic surgery. Kuijpers-Jagtman, Anne MarieĬone-beam computed tomography (CBCT) is widely used in maxillofacial surgery. Integration of Digital Dental Casts in Cone-Beam Computed Tomography Scans
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