Condylar height on panoramic radiographs: A methodologic study with a clinical application

Abstract

The aim of this study was to develop and apply a reliable method of measuring the effects of condylar lesions quantitatively on panoramic radiographs. Three different types of machines were tested. Two dry skulls were exposed in six positions in each machine, and the relative size of the condyle in relation to ramus height was calculated. The results showed good validity for the reference points used. The head position did not contribute to the variation in the measurements, but the type of panoramic machine had some influence. It was concluded that the method may be applied when calculating condylar ratios, provided that the same panoramic machine is used. The relative height of the condyle in relation to ramus height was measured bilaterally in three groups of children, with either normal or postnormal occlusion or with juvenile chronic arthritis (JCA), to detect possible asymmetries and define differences in the relative condylar height. The JCA group had a significantly shorter relative condylar height, and asymmetries were commoner than in the other two groups.

Prevalence of Vertical Condilar Asymmetry of the Temporomandibular Joint in Patients with Signs and Symptoms of Temporomandibular Disorders

“…VCA is determined by comparing the vertical condylar height between the left and right condyle. Several techniques have been developed to evaluate this asymmetry, and the most common among them are developed by Kjellberg et al (1994) and Habets et al (1988). The objective of this study was to evaluate the similarity of the Habets' and Kjellberg's methods with regard to these results and analyze the VCA results of the temporomandibular joint in patients with signs and symptoms of TMD.…”

“…ACV se determina al comparar la altura condilar vertical entre el cóndilo derecho e izquierdo. Se han desarrollado diversas técnicas para evaluar esta asimetría, las más conocidas son las desarrolladas por Kjellberg et al (1994) y Habets et al (1988). El Objetivo de éste estudio fue evaluar la similitud de la técnica de Habets con la técnica de Kjellberg en cuanto a los resultados y analizar éstos resultados de ACV de la articulación temporomandibular en pacientes con signos y síntomas de un trastorno temporomandibular.…”

“…Techniques have been developed to evaluate this asymmetry, some based on standardized measurements on panoramic radiograph, because of the relative technique simplicity and low-dose radiation that the patient is exposed (Kjellberg et al, 1994). The most common are those developed by Kjellberg et al and Habets et al (1988).…”

Comparative Assessment of Vertical Facial Asymmetry Using Posteroanterior Cephalogram and Orthopantomogram

“…The distortion from both the radiographs. Some authors [20,21] have suggested the use of ratio over the linear dimensions especially in radiographs where chances of inherent errors like distortion, magnification either due to projection geometry or due to patient positioning, shadows the accuracy in determining the right left differences or asymmetry. With respect to panoramic radiographs, Van Eslande [20] stated that by using the ratio, condylar height asymmetries can be identified.…”

Características orofaciais de pacientes com artrite idiopática juvenil

“…A radiografia panorâmica de face é um exame muito utilizado na avaliação do sistema mastigatório por dar uma visão geral de ossos maxilares, dentes e ATM 100 . É exame de simples execução, baixa radiação e baixo custo, porém não é um exame de muita precisão 2 , e pode apresentar erros quando se deseja realizar medidas 77 . Em AIJ, é utilizado na avaliação das alterações da ATM 13,65,66,71,77,94 , na avaliação de dentes e de dimensões condilares e mandibulares 70 .…”