학술논문
Evaluation of open bite closure using clear aligners: a retrospective study
Research
Research
Document Type
Report
Author
Source
Progress in Orthodontics. August 24, 2020, Vol. 21 Issue 1
Subject
Language
English
Abstract
Author(s): Kayla Harris [sup.1], Kenji Ojima [sup.2], Chisato Dan [sup.2], Madhur Upadhyay [sup.1], Abdulrahman Alshehri [sup.3], Chia-Ling Kuo [sup.4], Jinjian Mu [sup.4], Flavio Uribe [sup.1], Ravindra Nanda [sup.1] Author Affiliations: [...]
Objectives To evaluate the dental and skeletal effects that occur in the correction of anterior open bite with clear aligners. Materials and method In this single-center retrospective study, the mechanism of anterior open bite closure using clear aligners (Invisalign, Align Technology, Santa Clara, CA, USA) was evaluated by cephalometric superimposition based on records of patients consecutively treated by a single, experienced Invisalign provider. Inclusion criteria consisted of anterior open bite (overbite 0.5 mm), adult patients (18+) at the beginning of treatment, consecutive records, and good quality pre- and post-treatment records, where the required landmarks were clearly visible. Results A total of 45 patients were included for data analysis with a mean age of 30.73 ± 8.0 years and initial open bite of - 1.21 ± 1.15 mm. During treatment, the upper incisors showed significant (p < 0.05) retraction [U1-SN'(°) = - 10.91 ± 6.95°], [U1-SN'.sub.perp(mm) = - 2.57 ± 1.75 mm] and extrusion [U1-SN'(mm) = 1.45 ± 0.89 mm]. The lower incisors also showed significant retraction [IMPA(°) = - 3.73 ± 4.91°), ([DELTA]L1-MP'.sub.perp (mm) = - 1.08 ± 1.59] and extrusion ([DELTA]L1-MP'(mm) = 0.53 ± 0.74). Regarding molar position, no significant changes were noted in the anteroposterior position of the upper [[DELTA]U6-SN'.sub.perp(mm) = 0.01 ± 1.08 mm] and lower molar [[DELTA]L6-MP'.sub.perp(mm) = 0.03 ± 0.87 mm]; however, there was a statistically significant intrusion of the upper [[DELTA]U6-SN'(mm) = - 0.47 ± 0.59 mm] and lower molar [[DELTA]L6-MP'(mm) = - 0.39 ± 0.76 mm]. Conclusion Open bite closure with clear aligners occurred due to a combination of maxillary and mandibular incisor extrusion and maxillary and mandibular molar intrusion, with slight mandibular auto rotation. Significant retraction of maxillary and mandibular incisors was also observed with treatment. Clear aligners are effective in reducing/controlling the vertical dimension in open bite patients.
Objectives To evaluate the dental and skeletal effects that occur in the correction of anterior open bite with clear aligners. Materials and method In this single-center retrospective study, the mechanism of anterior open bite closure using clear aligners (Invisalign, Align Technology, Santa Clara, CA, USA) was evaluated by cephalometric superimposition based on records of patients consecutively treated by a single, experienced Invisalign provider. Inclusion criteria consisted of anterior open bite (overbite 0.5 mm), adult patients (18+) at the beginning of treatment, consecutive records, and good quality pre- and post-treatment records, where the required landmarks were clearly visible. Results A total of 45 patients were included for data analysis with a mean age of 30.73 ± 8.0 years and initial open bite of - 1.21 ± 1.15 mm. During treatment, the upper incisors showed significant (p < 0.05) retraction [U1-SN'(°) = - 10.91 ± 6.95°], [U1-SN'.sub.perp(mm) = - 2.57 ± 1.75 mm] and extrusion [U1-SN'(mm) = 1.45 ± 0.89 mm]. The lower incisors also showed significant retraction [IMPA(°) = - 3.73 ± 4.91°), ([DELTA]L1-MP'.sub.perp (mm) = - 1.08 ± 1.59] and extrusion ([DELTA]L1-MP'(mm) = 0.53 ± 0.74). Regarding molar position, no significant changes were noted in the anteroposterior position of the upper [[DELTA]U6-SN'.sub.perp(mm) = 0.01 ± 1.08 mm] and lower molar [[DELTA]L6-MP'.sub.perp(mm) = 0.03 ± 0.87 mm]; however, there was a statistically significant intrusion of the upper [[DELTA]U6-SN'(mm) = - 0.47 ± 0.59 mm] and lower molar [[DELTA]L6-MP'(mm) = - 0.39 ± 0.76 mm]. Conclusion Open bite closure with clear aligners occurred due to a combination of maxillary and mandibular incisor extrusion and maxillary and mandibular molar intrusion, with slight mandibular auto rotation. Significant retraction of maxillary and mandibular incisors was also observed with treatment. Clear aligners are effective in reducing/controlling the vertical dimension in open bite patients.