Assessment of Posterior Dentoalveolar Expansion with Invisalign in Adult Patients

Vincent Santucci, Paul Emile Rossouw, Dimitrios Michelogiannakis, Tarek El-Baily and Changyong Feng
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Vincent Santucci: Private Practice, 1700 Waterfront Building 700, Wichita, KS 67206, USA
Paul Emile Rossouw: Division of Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health, University of Rochester, 625 Elmwood Ave., Rochester, NY 14620, USA
Dimitrios Michelogiannakis: Division of Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health, University of Rochester, 625 Elmwood Ave., Rochester, NY 14620, USA
Tarek El-Baily: 7-020D Katz Group Centre for Pharmacy and Health Research, Department of Dentistry and Dental Hygiene, University of Alberta, Edmonton, AB T6G 2R7, Canada
Changyong Feng: Medical Center, Department of Biostatistics and Computational Biology, School of Medicine and Dentistry, University of Rochester, Rochester, NY 14642, USA

IJERPH, 2023, vol. 20, issue 5, 1-8

Abstract: Purpose: The primary aim was to evaluate dentoalveolar expansion with Invisalign clear aligners comparing linear measurements in ClinCheck vs. cone beam computed tomography (CBCT). This would enable an assessment of to what extent expansion gained from Invisalign clear aligners was due to buccal tipping and/or bodily translation of the posterior teeth. The study also evaluated the predictive value of Invisalign ClinCheck ® (Align Technology, San Jose, CA, USA) to final outcomes. Methods: The orthodontic records of thirty-two (32) subjects comprised the sample to conduct this study. Linear values of the upper arch width were measured for premolars and molars at two different points (occlusal and gingival) utilized for ClinCheck ® measurements and three different points for CBCT measurements before (T 0 and after treatment (T 1 ). Paired T-tests at a significance level of 0.05 were used for analyses. Results: Expansion was found to be possible with Invisalign clear aligners. However, more expansion was measured at the cusp tips compared to gingival margins ( p < 0.0001), indicating more tipping was occurring than bodily translation. ClinCheck ® also showed a significant overestimation of the amount of expansion capable, with nearly 70% expression in the first premolar area, and the expression decreased as one moved posteriorly with only 35% expressed at the first molar area ( p < 0.0001). Conclusions: Dentoalveolar expansion with Invisalign is achieved through buccal tipping of posterior teeth and bodily translation; and there is a significant overestimation of the amount of expansion achieved between ClinCheck ® and clinical results.

Keywords: orthodontic expansion; clear aligner (Invisalign); prediction; overestimation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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