Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study
Abstract Objective To evaluate the biomechanical effects of different attachments’ position for maxillary molar intrusion with clear aligner treatment by finite element analysis. Methods Cone-beam computed tomography images of a patient with supra-eruption of the maxillary second molars were selecte...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2022-10-01
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| Series: | BMC Oral Health |
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| Online Access: | https://doi.org/10.1186/s12903-022-02472-z |
| _version_ | 1817970829733920768 |
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| author | Dian Fan Hao Liu Chang-Yong Yuan Shi-Yu Wang Peng-Lai Wang |
| author_facet | Dian Fan Hao Liu Chang-Yong Yuan Shi-Yu Wang Peng-Lai Wang |
| author_sort | Dian Fan |
| collection | DOAJ |
| description | Abstract Objective To evaluate the biomechanical effects of different attachments’ position for maxillary molar intrusion with clear aligner treatment by finite element analysis. Methods Cone-beam computed tomography images of a patient with supra-eruption of the maxillary second molars were selected to construct three-dimensional models of the maxilla, periodontal ligaments, dentition, and clear aligner. The models were divided into four groups depending on the attachment location on the first molar: (1) no attachment (NA), (2) buccal attachment (BA), (3) palatal attachment (PA), and (4) bucco-palatal attachment (BPA). After applying an intrusion of 0.2 mm on the second molar, displacements and stress distributions of the teeth, aligner, and periodontal ligament were analyzed with the finite element software. Results All groups displayed equivalent movement patterns of aligners. The NA and BA groups showed buccal tipping of the second molar, while the PA group showed palatal tipping. The BPA group had the highest intruding value and the lowest buccal/palatal tipping value. All groups showed mesial tipping of the second molar. Stress distribution in the periodontal ligament strongly correlated with the attachment position. The BPA group showed the best stress distribution. Conclusion Combined BA and PA could effectively prevent buccal and palatal tipping and showed the best efficiency in intruding the second molar. The second molar showed an unavoidable tendency to tip mesially, regardless of the attachment position. |
| first_indexed | 2024-04-13T20:39:03Z |
| format | Article |
| id | doaj.art-87d3bb3ad5b94db59240f52c62d78d87 |
| institution | Directory Open Access Journal |
| issn | 1472-6831 |
| language | English |
| last_indexed | 2024-04-13T20:39:03Z |
| publishDate | 2022-10-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Oral Health |
| spelling | doaj.art-87d3bb3ad5b94db59240f52c62d78d872022-12-22T02:30:57ZengBMCBMC Oral Health1472-68312022-10-012211810.1186/s12903-022-02472-zEffectiveness of the attachment position in molar intrusion with clear aligners: a finite element studyDian Fan0Hao Liu1Chang-Yong Yuan2Shi-Yu Wang3Peng-Lai Wang4School of Stomatology, Xuzhou Medical UniversityDepartment of Orthodontics, Affiliated Stomatological Hospital of Xuzhou Medical UniversityDepartment of Implantology, Affiliated Stomatological Hospital of Xuzhou Medical UniversitySchool of Stomatology, Xuzhou Medical UniversityDepartment of Implantology, Affiliated Stomatological Hospital of Xuzhou Medical UniversityAbstract Objective To evaluate the biomechanical effects of different attachments’ position for maxillary molar intrusion with clear aligner treatment by finite element analysis. Methods Cone-beam computed tomography images of a patient with supra-eruption of the maxillary second molars were selected to construct three-dimensional models of the maxilla, periodontal ligaments, dentition, and clear aligner. The models were divided into four groups depending on the attachment location on the first molar: (1) no attachment (NA), (2) buccal attachment (BA), (3) palatal attachment (PA), and (4) bucco-palatal attachment (BPA). After applying an intrusion of 0.2 mm on the second molar, displacements and stress distributions of the teeth, aligner, and periodontal ligament were analyzed with the finite element software. Results All groups displayed equivalent movement patterns of aligners. The NA and BA groups showed buccal tipping of the second molar, while the PA group showed palatal tipping. The BPA group had the highest intruding value and the lowest buccal/palatal tipping value. All groups showed mesial tipping of the second molar. Stress distribution in the periodontal ligament strongly correlated with the attachment position. The BPA group showed the best stress distribution. Conclusion Combined BA and PA could effectively prevent buccal and palatal tipping and showed the best efficiency in intruding the second molar. The second molar showed an unavoidable tendency to tip mesially, regardless of the attachment position.https://doi.org/10.1186/s12903-022-02472-zClear alignersFinite element analysisMolar intrusionAttachment |
| spellingShingle | Dian Fan Hao Liu Chang-Yong Yuan Shi-Yu Wang Peng-Lai Wang Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study BMC Oral Health Clear aligners Finite element analysis Molar intrusion Attachment |
| title | Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study |
| title_full | Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study |
| title_fullStr | Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study |
| title_full_unstemmed | Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study |
| title_short | Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study |
| title_sort | effectiveness of the attachment position in molar intrusion with clear aligners a finite element study |
| topic | Clear aligners Finite element analysis Molar intrusion Attachment |
| url | https://doi.org/10.1186/s12903-022-02472-z |
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