Predicted overbite and overjet changes with the Invisalign appliance: a validation study

Abstract

Objectives: To investigate whether the predicted changes in overbite (OB) and overjet (OJ) in Align Technology’s (Santa Jose, Calif) digital treatment plan for the prescribed course of treatment with the Invisalign appliance were consistent with those same changes in OB and OJ measured with the Geomagic Control X (Geomagic US, Research, Triangle Park, NC) metrology software system. Materials and Methods: Geomagic Control X software was used to determine OB and OJ differences between the pretreatment and predicted outcome. STL files for patients satisfying inclusion criteria and undergoing nonextraction orthodontic treatment with the Invisalign appliance. The differences were compared, using the Bland-Altman analysis, to the corresponding data provided by Align Technology’s digital treatment-planning interface, ClinCheck. Results: Data regarding 76 adult patients who satisfied strict inclusion criteria were assessed. The Shapiro-Wilks test indicated normality (P . .05). The Bland-Altman analysis showed high levels of agreement between the two measurements, with a bias range of 0.131 to 0.111 for OB and 0.393 to 0.03 for OJ recorded. Conclusions: Clinicians and researchers can be confident that measurement data provided by Invisalign’s ClinCheck digital treatment-planning facility concerning OB and OJ changes from the initial to the predicted treatment outcome are valid.