Three-dimensional evaluation of the transfer accuracy of a bracket jig fabricated using computer-aided design and manufacturing to the anterior dentition: An in vitro study
박재현, 최진영, 김성훈, 김수정, 이기준, Nelson Gerald,
소속 상세정보
박재현 ( Park Jae-Hyun ) - Kyung Hee University Graduate School of Dentistry Department of Orthodontics
최진영 ( Choi Jin-Young ) - Kyung Hee University Graduate School of Dentistry Department of Orthodontics
김성훈 ( Kim Seong-Hun ) - Kyung Hee University Graduate School of Dentistry Department of Orthodontics
김수정 ( Kim Su-Jung ) - Kyung Hee University Graduate School of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
( Nelson Gerald ) - Kyung Hee University Graduate School of Dentistry Department of Orthodontics
Abstract
Objective: To evaluate the accuracy of a one-piece bracket jig system fabricated using computer-aided design and manufacturing (CAD/CAM) by employing three-dimensional (3D) digital superimposition.
Methods: This in vitro study included 226 anterior teeth selected from 20 patients undergoing orthodontic treatment. Bracket position errors from each of the 40 arches were analyzed quantitatively via 3D digital superimposition (best-fit algorithm) of the virtual bracket and actual bracket after indirect bonding, after accounting for possible variables that may affect accuracy, such as crowding and presence of the resin base.
Results: The device could transfer the bracket accurately to the desired position of the patient’s dentition within a clinically acceptable range of ± 0.05 mm and 2.0° for linear and angular measurements, respectively. The average linear measurements ranged from 0.029 to 0.101 mm. Among the angular measurements, rotation values showed the least deviation and ranged from 0.396° to 0.623°. Directional bias was pronounced in the vertical direction, and many brackets were bonded toward the occlusal surface. However, no statistical difference was found for the three angular measurement values (torque, angulation, and rotation) in any of the groups classified according to crowding. When the teeth were moderately crowded, the mesio-distal, bucco-lingual, and rotation measurement values were affected by the presence of the resin base.
Conclusions: The characteristics of the CAD/CAM one-piece jig system were demonstrated according to the influencing factors, and the transfer accuracy was verified to be within a clinically acceptable level for the indirect bracket bonding of anterior teeth.
키워드
3D scanner; Bracket; Bonding; Digital model
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