Comparison of different parameters for recording sagittal maxillo mandibular relation using natural head posture: A cephalometric study

Abstract

Background:Commonly used parameters for anteroposterior assessment of the jaw relationship includes several analyses such as ANB, NA-Pog, AB-NPog, Wits appraisal, Harvold's unit length difference, Beta angle. Considering the fact that there are several parameters (with different range and values) which account for sagittal relation, and still the published literature for comparisons and correlation of these measurements is scarce. Therefore, the objective of this study was to correlate these values in subjects of Indian origin.Materials and Methods:The sample consisted of fifty adult individuals (age group 18-26 years) with equal number of males and females. The selection criteria included subjects with no previous history of orthodontic and/or orthognathic surgical treatment; orthognathic facial profile; Angle's Class I molar relation; clinical Frankfort Mandibular plane angle FMA of 30±5° and no gross facial asymmetry. The cephalograms were taken in natural head position (NHP). Seven sagittal skeletal parameters were measured in the cephalograms and subjected to statistical evaluation with Wits reading on the true horizontal as reference. A correlation coefficient analysis was done to assess the significance of association between these variables.Results:ANB angle showed statistically significant correlation for the total sample, though the values were insignificant for the individual groups and therefore may not be very accurate. Wits appraisal was seen to have a significant correlation only in the female sample group.Conclusions:If cephalograms cannot be recorded in a NHP, then the best indicator for recording A-P skeletal dimension would be angle AB-NPog, followed by Harvold's unit length difference. However, considering biologic variability, more than one reading should necessarily be used to verify the same.

Diagnostic validity of different cephalometric analyses for assessment of the sagittal skeletal pattern

“…In the past, multiple researchers have correlated various cephalometric analyses for assessing anteroposterior jaw disrepancy. 14 - 18 Ahmed et al 19 reported the diagnostic accuracy of various cephalometric skeletal parameters for assessing the skeletal facial vertical pattern. However, to our knowledge, no such study has evaluated the reliability of anteroposterior skeletal dysplasia parameters.…”

Reliability of overbite depth indicator (ODI) and anteroposterior dysplasia indicator (APDI) in the assessment of different vertical and sagittal dental malocclusions: a receiver operating characteristic (ROC) analysis

“…, 3 , 8 , 9 Riedel 2 introduced the ANB angle in 1952. It estimates the discrepancy of maxilla and mandible in reference to the anterior cranial base.…”

“…Hence, the diagnosis drawn from the most commonly used analyses is still questionable 2 3 , 8 , 9 , 10 In order to overcome these shortcomings, Kim and Vietas 11 studied cephalograms of 102 subjects with normal occlusion and 874 subjects with different dental malocclusions based on Angle's classification, and proposed the anteroposterior dysplasia indicator (APDI) which scores the sagittal skeletal relationship. The APDI is the sum of three interplaner angles that showed the highest correspondence with Angle's classification 12 …”

Cephalometric Analysis Difference Between Skeletal and Soft Tissue Measurements

“…This comparative cross-sectional study was conducted at the Orthodontics Department of Armed forces Institute of Dentistry (AFID) Rawalpindi Pakistan from February to August 2019. The sample size was calculated by WHO sample size calculator using population proportion of sagittal maxillomandibular relation using natural head posture as 30%, 11 by keeping the margin of error as 10%. A consecutive sampling technique was used to gather the sample.…”