Advisory Committee Chair
Advisory Committee Members
Chung How Kau
Jerry Don Spillers
Date of Award
Degree Name by School
Master of Science (MS) School of Dentistry
Objective: The purpose of this study is twofold: To assess the amount of molar intrusion that can be predictably be achieved with clear aligners (Invisalign, Align Technology, Santa Clara, CA, USA) and to quantitatively document the dental and skeletal changes resulting from anterior open bite correction. Methods: This retrospective case-series study analyzed lateral cephalograms of 23 adult anterior open bite patients treated with Invisalign. Pre-treatment (IN) and post-treatment (FN) cephalograms were traced to determine changes as a result of treatment. 13 different variables were measured, 6 angular and 7 linear. All patients were treated consecutively by a single, experienced Invisalign provider in their private practice. Inclusion criteria included: anterior open bite (overbite < 0.0 mm), patients at least 18 years of age at the initiation of treatment, both arches treated with Invisalign, and good quality pre-treatment (IN) and post-treatment (FN) lateral cephalograms. Paired t-tests were used to analyze the data and determine significant changes that occurred as a result of treatment. Results: A total of 23 patients met the inclusion criteria and were included for data analysis with an average pretreatment age of 38.5 years [standard deviation (SD) = 12.95] and pretreatment open bite of -1.6 +/- 1.2 mm. Statistically significant (P < 0.05) differences were found in 8 of 13 variables. These variables included an increase in overbite (+2.6mm), a decrease in lower anterior facial iv height (LAFH) (- 0.62mm), intrusion of the maxillary 1st molar (U6-PP) (-0.66mm), intrusion of the mandibular 1st molar (L6-MP) (-0.68mm), extrusion of the maxillary incisor (U1-PP) (+ 0.90mm), retroclination of the maxillary incisor (U1-PP) (-5.2), extrusion of the mandibular incisor (L1-PP) (0.67mm), and retroclination of the mandibular incisor (L1-MP) (-5.2). Conclusion: Invisalign is an effective treatment modality for adult non-growing anterior open bite patients. This system can effectively control and even reduce the vertical dimension, but does not seem to change the skeletal face significantly. Open bite closure with Invisalign occurred due to a combination of tooth movements: maxillary and mandibular incisor extrusion, maxillary and mandibular incisor retroclination, and maxillary and mandibular molar intrusion, leading to a slight decrease in lower anterior facial height.
Icenhour, Logan, "Effectiveness of Maxillary Molar Intrusion With the Invisalign System for Correction of anterior Open Bites" (2021). All ETDs from UAB. 321.