Influences of Stress Distribution on Bone-Anchored Maxillary Protraction at Different Protraction Sites
10.16156/j.1004-7220.2022.01.23
- VernacularTitle:不同牵引位点进行骨性支抗上颌前方牵引时骨缝应力分布特征
- Author:
Linna WANG
1
;
Xiaoying HU
1
;
Yang LIU
1
;
Xiaolei GE
1
;
Liru ZHAO
1
;
Chunyan LIU
1
;
Haiyan LU
1
;
Wensheng MA
1
Author Information
1. Hebei Clinical Research Center for Oral Diseases, Hebei Key Laboratory of Stomatology, Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University
- Publication Type:Journal Article
- Keywords:
maxillary protraction site;
implant;
craniofacial sutures;
maxilla
- From:
Journal of Medical Biomechanics
2022;37(1):E148-E154
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the influence of stress distributions on bone-anchored maxillary protraction at different protraction sites, so as to guide patients to choose an optimal protraction site in clinic. Methods A three-dimensional (3D) finite element model of child head with implant anchorages was establised. Four protraction sites were set according to the position of implant installation. Working condition 1: the alveolar bone at the intersection of distal 2 mm of primary lateral incisor crown distal surface and gingival cervical margin to 5 mm. Working condition 2: the alveolar bone at the intersection of mesial 2 mm of maxillary first primary molar crown mesial surface and gingival cervical margin to 5 mm. Working condition 3: the alveolar bone at the intersection of mesial 2 mm of maxillary first molar crown mesial surface and gingival cervical margin to 5 mm. Working condition 4: the alveolar bone at the intersection of distal 2 mm of maxillary first molar crown distal surface and gingival cervical margin to 5 mm. The finite element models were loaded with 500 g protraction force at each side with 30° forward direction to the occlusal plane. Stress distributions on each suture were analysed. Results The maximum stress of frontomaxillary suture was in working condition 2 (1 477-28 190 Pa). The maximum stress of nasomaxillary suture was in working condition 1 (5.296-924 Pa). The maximum stress of zygomaticomaxillary suture was in working condition 4(394.7-13 130 Pa). The maximum stress of zygomaticofrontalis suture was in working condition 4 (495.2-31 690 Pa). The maximum stress of zygomaticotemporal suture was in working condition 3 (1 148-15 870 Pa). The maximum stress of medianpalatine suture was in working condition I (6.479-730 Pa). Conclusions When the protraction sites are set in distal maxillary primary lateral incisor and mesial maxillary first primary molar, it is of positive significance to improve the concave profile, especially in nose root. When the protraction sites are set in mesial or distal maxillary first molar, it is of positive significance to improve the concave profile, especially in maxillary basal bone of the midface.
