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The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment
- Source :
- American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. 156(3)
- Publication Year :
- 2018
-
Abstract
- Introduction We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. Methods 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. Results The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. Conclusions The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.
- Subjects :
- Molar
Tooth Movement Techniques
Periodontal Ligament
Finite Element Analysis
Orthodontics
Mandible
Mandibular first molar
Orthodontics, Corrective
03 medical and health sciences
Median plane
0302 clinical medicine
Dental Arch
Imaging, Three-Dimensional
stomatognathic system
Premolar
medicine
Alveolar Process
Periodontal fiber
Humans
Bicuspid
Dental alveolus
Mathematics
030206 dentistry
Models, Dental
Dental arch
medicine.anatomical_structure
Posterior teeth
Tooth
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 10976752
- Volume :
- 156
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics
- Accession number :
- edsair.doi.dedup.....31af13165c58e687f473f552d8d48531