Predictability of deep overbite correction using Invisalign
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Date
2019
Authors
Fontaine-Sylvestre, Catherine
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Abstract
OBJECTIVES: To investigate the predictability of deep bite correction with Invisalign® (Align Technology, Santa Clara, CA, USA).
MATERIALS AND METHODS: This retrospective study included 60 adult patients who had undergone dual-arch orthodontic treatment exclusively with Invisalign®. Pre- and post-treatment digital models acquired from an iTero® scan were obtained from a single orthodontic practitioner. The ClinCheck® digital models of the final predicted outcome were obtained from Align Technology®. Linear values of pre-treatment, prediction and post-treatment overbite were measured using OrthoAnalyzer® (3Shape®, Copenhagen, Denmark) software. Overbite changes planned by ClinCheck® and overbite corrections obtained clinically were compared using a paired t-test (P < 0.05). A Spearman correlation coefficient was used to determine if larger overbite corrections predicted were correlated with poorer prediction accuracies. One-way analysis of variance (ANOVA) (P < 0.05) were used to determine if the severity of pre-treatment overbite, the number of active aligners, the number and type of bite opening mechanisms programmed in the ClinCheck®, and the number and type of mandibular premolars attachments significantly affected the prediction accuracy.
RESULTS: A statistically significant difference was found between the ClinCheck® prediction and the clinical final result regardless of the pre-treatment deep bite severity (P < 0.05). Requesting more overbite correction in the ClinCheck® did not significantly affect the accuracy (ρ = 0.049). Variance ratio tests were not significant (P > 0.05), except for cases programmed with mandibular incisor proclination in ClinCheck® (P < 0.05).
CONCLUSION: The mean prediction accuracy of deep overbite correction using Invisalign® was 37.67%. Lower incisor proclination seems to improve the prediction accuracy. Since the ClinCheck software significantly overestimates vertical changes, overcorrection of the finished occlusion is indicated.
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Keywords
Invisalign, Orthodontics