The Value Of Quantitative Analysis Of Panoramic Radiographs For Mandibular Asymmetry

Objective:To study the relationship with two sides of mandibular between the panoramic and posterior-anterior radiographs of the patients with mandibular asymmetry, and discuss the value of quantitative analysis of panoramic radiographs for mandibular asymmetry.Methods:Panoramic and posterior-anterior radiographs were taken in 50 patients with mandibular asymmetry before treatment, who have came to the Orthodontic Department of the First Affiliated Hospital of Xinjiang Medical University during 2008-2009. the mandibular linear dimensions and Vig's triangulation was introduced.method 1, Mandibular linear dimension measurement:Both sides of the mandibular ramus height, mandibular corpus lengh and mandibular total length were measured on these radiographs. The data were statistically analyzed. Method 2, Vig's triangulation:take the same samples, and both sides of the triangle acreage were measured on these radiographs. The data were statistically analyzed.Results:result of mandibular linear dimension measurement:significant correlations of mandibular ramus height and mandibular total length between panoramic and posterior-anterior radiographs were found while lower significant correlation of mandibualr corpus lengh was noted. Result of Vig's triangulation:significant correlations of both sides of the triangle acreage between panoramic and posterior-anterior radiographs were noted.Conclusion:when observe rigidly the screen demand, to be a method of assistant diagnosis, it can be used for quantitative analysis to evaluate the mandibular asymmetry.