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Finite element analysis of C-expanders with different vertical vectors of anchor screws
- Source :
- American Journal of Orthodontics and Dentofacial Orthopedics. 159:799-807
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Introduction C-expanders are tissue- and bone-borne maxillary expanders that are anchored by 6 orthodontic miniscrews, 3 on each side of the palate. The purpose of the study was to investigate the effect of C-expanders on the circummaxillary sutures and bucco-palatal axis of teeth in 3-dimensional finite element analyses when anchor screw vectors are different. Methods Five expansion models were studied on the basis of the vertical positions of anchor screws on the palate. Anchor screws for models A, B, and C were placed symmetrically at 4 mm, 7 mm, and 15 mm below the cementoenamel junction (CEJ), respectively. Anchor screws for models D and E were placed asymmetrically at 4 mm and 15 mm below CEJ and 7 mm and 15 mm below CEJ, respectively. Stress, displacement, and angular changes of the bone and teeth were measured in elastoplastic behavior models using a static-nonlinear simulation in an implicit method. Results Symmetrical and asymmetrical anchor screw placement with different vertical vectors were compared using finite element analyses on 5 models. Conclusions Using different vectors of anchor screws for C-expanders does change the pattern of palatal expansion (null hypothesis was rejected). The current investigation presents a promising future of controlled asymmetric skeletal maxillary expansion when asymmetric maxillary architecture needs to be corrected for successful orthodontic outcomes without involving orthognathic surgeries.
- Subjects :
- Orthodontics
Palatal Expansion Technique
Palate
Bone Screws
Finite Element Analysis
030206 dentistry
Finite element method
Screw placement
Bone screws
03 medical and health sciences
Cementoenamel junction
0302 clinical medicine
Maxilla
Humans
Displacement (orthopedic surgery)
030217 neurology & neurosurgery
Mathematics
Subjects
Details
- ISSN :
- 08895406
- Volume :
- 159
- Database :
- OpenAIRE
- Journal :
- American Journal of Orthodontics and Dentofacial Orthopedics
- Accession number :
- edsair.doi.dedup.....abdb9c0459368c191a8535c3ac723e97