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Accuracy of bracket position using thermoplastic and 3D-printed indirect bonding trays

Authors
 Seol-Hee Shin  ;  Kee-Joon Lee  ;  Su-Jung Kim  ;  Hyung-Seog Yu  ;  Kwang-Mahn Kim  ;  Chung-Ju Hwang  ;  Jung-Yul Cha 
Citation
 INTERNATIONAL JOURNAL OF COMPUTERIZED DENTISTRY, Vol.24(2) : 133-145, 2021-06 
Journal Title
INTERNATIONAL JOURNAL OF COMPUTERIZED DENTISTRY
Issue Date
2021-06
Keywords
accuracy of bracket placement ; customized orthodontic bracket ; digital tooth setup ; indirect bracket bonding ; manual tooth setup ; 3D-printed tray
Abstract
Aim: The positional accuracy of bracket placement planned through tooth setup vs actual placement was evaluated by means of conventional thermoplastic indirect bonding trays and customized 3D-printed indirect bonding trays.

Materials and methods: A total of 280 bracket positions placed on the crowns of 10 dental plaster models were evaluated. The manual setup method and a thermoplastic indirect bonding tray were used for the manual group. For the CAD/CAM group, the bracket was positioned using a digital setup and a corresponding 3D-printed tray. The positional accuracy of the bracket placement on the duplicated gypsum model using the trays was evaluated by means of 3D software. Six errors of bracket position (height, depth, mesiodistal, torque, rotation, and tip errors), including linear and angular errors, were measured. Differences in variables were compared across subgroups using the independent t test or the Mann-Whitney U test.

Results: Only the height error differed significantly (P < 0.05) between groups (manual: 0.2 mm; CAD/CAM: 0.12 mm). For both incisors and molars, the manual group showed significantly greater height errors than the CAD/CAM group (P < 0.05). The analysis of variance of the position error to the whole bracket showed statistically significant differences between tooth positions, linear measurements, and angular measurements (P < 0.05).

Conclusion: A 3D-printed indirect bonding tray showed accuracy similar to that of conventional methods for bracket placement, with slightly greater bracket height accuracy. Further studies should strive to improve accuracy in terms of tooth positions.
Full Text
https://www.quintessence-publishing.com/deu/en/article/1509975
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kwang Mahn(김광만) ORCID logo https://orcid.org/0000-0002-5235-0294
Yu, Hyung Seog(유형석) ORCID logo https://orcid.org/0000-0002-1275-5078
Lee, Kee Joon(이기준) ORCID logo https://orcid.org/0000-0002-0782-3128
Cha, Jung Yul(차정열)
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/187107
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