A cone-beam computed tomographic study evaluating the efficacy of incisor movement with clear aligners: Assessment of incisor pure tipping, controlled tipping, translation, and torque
| Autor: | Yu-Nan Jiang, Tang Guohua, Feng-Ting Chu, Ting Jiang, Pei-Jun Lu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tooth Movement Techniques
Orthodontics Treatment results Computed tomographic Retrospective data 03 medical and health sciences 0302 clinical medicine stomatognathic system Incisor Beam (nautical) Orthodontic Appliances Removable Maxilla Medicine Humans Retrospective Studies Movement (music) business.industry Biomechanics 030206 dentistry Cone-Beam Computed Tomography Sagittal plane stomatognathic diseases medicine.anatomical_structure Torque business 030217 neurology & neurosurgery |
| Zdroj: | American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. 159(5) |
| ISSN: | 1097-6752 |
| Popis: | Introduction This retrospective clinical study aimed to evaluate the efficacy of different types of incisor movements with clear aligners in the sagittal plane. Methods Pretreatment and posttreatment cone-beam computed tomography (CBCT) scans were collected from 69 patients who underwent nonextraction treatment with clear aligners (Invisalign; Align Technology, San Jose, Calif). Integrated 3-dimensional models of the virtual incisor position (ClinCheck; Align Technology) and the posttreatment incisor position (from posttreatment CBCT scans) were superimposed over the pretreatment position (from pretreatment CBCT scans) using Mimics software (Materialise, Leuven, Belgium). On the basis of the location of the rotation center, incisors showing pure tipping (>10°), controlled tipping (>10°), translation (>1 mm), or torque (>10°) movements were selected. Efficacy was determined by comparing the predicted and achieved incisor movement, and differences with efficacy were analyzed using Kruskal-Wallis and Shapiro-Wilk tests (α = 0.05). Results In measurements for 231 incisors, the mean efficacy of incisor movements in the sagittal plane was 55.58%. The most and least predictable movements were pure tipping (72.48%) and torque (35.21%), respectively. Labial root movement was significantly more predictable than lingual root movement, and labial movement of the mandibular incisors was significantly easier than that of the maxillary incisors. The type of tooth movement achieved was different from the type designed. Conclusions The efficacy of incisor movement in the sagittal plane using clear aligners varies with designed movement type, and labial root movement appears to be more accurate than the lingual root movement. The biomechanics of clear aligners remains to be further elucidated to achieve more predictable treatment results. |
| Databáze: | OpenAIRE |
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