ABSTRACT

Objective:

The aim of this study was to investigate the cephalometric parameters that impair the consistency between the Wits and ANB measurements, which are used in the determination of anteroposterior jaw relationships by logistic regression analysis in the Turkish population.

Methods:

This retrospective study was conducted on 207 lateral cephalometric radiographs of 100 females (mean age: 15.5±1.09 years; age range: 14.2–17.3 years) and 107 males (mean age: 15.1±0.93 years; age range: 14.1–16.9 years) obtained from the archives of the orthodontic department. Lateral cephalometric radiographs were divided into two groups according to the presence of inconsistency between the ANB angle and Wits appraisal. The cephalometric parameters that cause the inconsistency were determined using a logistic regression method with the creation of three different regression models.

Results:

We found posterior rotation of the mandible (SN-MP⁰) (OR=1.09; p=0.029) as an independent predictor of the inconsistency in Model 1. In Model 2, SN-MP⁰ (OR=1.11; p=0.016) was also found to be effective on the development of the inconsistency. In Model 3, inclination of the occlusal plane (OP-SN⁰) (OR=1.07, p=0.02) was the independent predictor of the inconsistency.

Conclusion:

An increase in SN-MP⁰ and OP-SN⁰ are effective in the development of inconsistency between the ANB and Wits appraisals in the Turkish population.