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UBC Theses and Dissertations

A novel method to integrate intra-oral scan models with 3D facial images Sigouin, Amanda Justine


Objectives: Three-dimensional (3D) imaging is becoming more mainstream with advances in digital technology and reduction in cost. Two-dimensional (2D) imaging has been the standard in orthodontics but it would be beneficial to examine virtual 3D patients for diagnosis, treatment planning, and assessment of growth and treatment outcomes with no use of ionizing radiation. This study aimed to validate the Bellus Arc7 3D facial scanner and test a novel method for integrating intraoral scans with 3D facial images to create a virtual patient. Methods: Part I entailed validation of Bellus Arc7 using the conventional reference standard, the 3dMDface system. Three subjects were selected, and for each 4 images were taken on two occasions one week apart. Images were uploaded, superimposed, and a 3D heat map was generated for comparison using Geomagic Control X processing software. Part II compared a novel merging technique from 14 participants recruited from UBC Graduate Orthodontic Program. For each subject, 5 images were captured (two images using Trios intraoral scanner, one facial scan with Bellus Arc7, and two with Artec Space Spider). The intra-oral scan of the upper dentition and the Arc7 3D facial scans were merged via the transferring of the perioral scan to develop a virtual patient. The reference 3D virtual image from the alignment of the dental scan and Artec Space Spider facial scans was used for comparison. The surface-to-surface root mean square and point-to-point deviation values between the two meshes were analysed. Results: Part I showed the root mean square for Bellus Arc7 as compared to the reference 3dMD to be 1.16 ± 0.41 mm for all three subjects, which is clinically acceptable for soft tissue measurements. Part II showed that relative to the merged Artec Space Spider scans, the root mean square difference of the merged Arc7 scans was 1.52 ± 0.54 mm. For the point-to-point deviations in the dentition there was a relatively wide range of mean differences. Conclusions: The results indicated that creating a 3D patient by merging the dental scan with 3D facial images acquired with Bellus Arc7 is adequate quality for most clinical applications, albeit very technique sensitive.

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