Year: 2013
Type: dissertation
Study design: Observational Study
Abstract: Introduction: This study evaluated whether panoramic radiographs can provide an adequate estimate of antegonial notch depth and compared development of the antegonial notch with vertical growth in various patient groups.Methods: Longitudinal growth-period cephalograms were collected for 43 open bite (OB), 61 Pierre Robin sequence (PRS), 13 idiopathic condylar resorption (ICR), and 104 matched controls, along with 35 pairs of panoramic and cephalometric radiographs.Notch depth, mandibular plane angle and vertical facial dimensions were measured.Results: Antegonial notch depth taken from panoramic radiographs was well correlated with cephalometric measurements but underestimated the value by 0.56mm.At T1, notch depth was already greater in patient groups than in controls, but except for the ICR group, did not change during growth, nor did notch depth predict vertical growth patterns.The ICR group was unique in having greater notch depth than OB even at T1, in showing poor growth of posterior facial height, and in the increasing mandibular plane angle.In controls, antegonial notch depth was positively correlated with vertical dimensions and mandibular plane angle.Conclusions: Panoramic radiographs are an adequate substitute for cephalograms for estimating antegonial notch depth.Except in ICR, notch depth is established early and maintained throughout the growth period, and therefore is not a good predictor of future vertical facial growth.An unusually deep notch at T1 may indicate that a patient is at risk for ICR.i
Author: Maggie Haitian Wang
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2291664205