Abstract
To compare the relationship between Riedel and Wits appraisal in skeletal III malocclusions and to assess the effect of variation in the vertical skeletal measurements. One-hundred and twenty consecutive subjects with Class III malocclusions attending orthognathic clinics were analysed. Lateral cephalograms were hand-traced under standardized conditions. Cephalometric measurements included Riedel analysis, Wits appraisal, A point/B point to Frankfurt plane (AF-BF) and vertical measurements. The mean ANB and Wits values were -3.22° and -11.39mm, respectively. A positive correlation was found between ANB and Wits overall (r=-.49; P<.001). However, there was poor agreement between both Wits (r=.087) and Riedel (r=.089) with AF-BF (P>.05). A negative correlation existed between Wits and LAFH% (r=-.64, P-value<.001); however, no relationship was observed between ANB and LAFH% (P>.05) based on linear regression analysis. There is a positive relationship between ANB and Wits; however, neither correlated well with a purer antero-posterior assessment (AF-BF). Furthermore, variations in the vertical skeletal measurements affect the strength of agreement. Caution is advised in the interpretation of antero-posterior analysis especially in the presence of vertical discrepancy.
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