Reliability of numeric measurements for measuring sagittal discrepancies

Abstract

Background: Cephalometrics is an established diagnostic and research tool in orthodontic practice. Its primary role has been the evaluation of facial form using angular and linear measurements. Numeric Parameters are used to evaluate the sagittal discrepancies. Aim and objectives: To evaluate and compare the reliability of different numeric cephalometric parameters in assessing the sagittal jaw discrepancies in Konaseema population. Methodology: Sample size of the study is convenience sample of 90 and the sample was selected based on their malocclusions. Each malocclusion is divided into a group of 30 and a total of 3 groups were selected according to the sample size. Pretreatment lateral cephalograms of patients with sagittal discrepancies is taken. Convenience sample of 90 is taken & the patients who are about to start orthodontic treatment will be taken into consideration. All Lateral Cephalograms are taken with Standard Cephalometric Machine (Kodak Carestream CS8100) and Printer (Kodak Carestream Dry view 5700 Laser imager) with Magnification at 100. Results: Statistically significant difference was observed when the comparison done between the numeric parameters. Multiple pairwise comparisons of parametric measures between the study groups have shown that Significant differences were noted between the study groups in relation to all the four parametric measures. While highest “mean values” for “Yen angle” and “Tau angle” were observed in Group II, Group III had highest HBN and W angle mean values. Conclusions: Cephalometric measures, which are group-based norms. comparison with numeric measurements like YEN, TAU, HBN and W angles. The Yen angle, Tau angle is accurate and reliable in comparison with other numeric parameters