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The difference in hinge axis position determined by virtual versus conventional planning in orthognathic surgery
Jonas Rosenbusch1, Moritz Kanemeier1, Thomas Stamm1
1Department of Orthodontics, University of Münster, Albert-Schweitzer-Campus 1, Gebäude W 30, Münster, 48149, Germany.
Background:
The aim of the study was to compare the hinge axis position (Ax) determined by virtual (VSP) versus conventional orthognathic surgery planning (CSP).
Methods:
This retrospective cohort study included 320 (female/male = 204/116, median age 24.0 years) adult patients who received single- or two-jaw surgery originally planned using the CSP method and subsequently reevaluated using the VSP method. Three parameters (α = angle between the occlusal plane and reference plane, AxV = perpendicular distance between Ax and the occlusal plane, AxH = perpendicular distance between the upper incisor and AxV) for determining Ax were measured on cephalograms, both in VSP and CSP. Paired t-tests and Bland-Altman plots were used for statistical analysis.
Results:
Both methods differed significantly with a bias of -1.83[Formula: see text] (95% CI -2.04 to -1.62) for α, -0.24 mm (95% CI -0.41 to -0.08) for AxV and 0.46 mm (95% CI 0.27 to 0.65) for AxH, with negative values indicating an overestimation by the CSP method. All differences were within the range considered as clinically acceptable.
Conclusions:
There were statistically significant differences in all parameters; however, these differences were small and within the range generally considered to be clinically acceptable.
