Maryam Poosit; Mohammad Basafa; Farzaneh Ahrari; Amin Reza Movahedian
Abstract
Aim: There is little information about the diagnostic ability of SNB and Facial angles in class II malocclusion. The aim of this study was to evaluate sensitivity and specificity of SNB and Facial angle in diagnosing anteroposterior position of mandible in patients with skeletal class II malocclusion.Material ...
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Aim: There is little information about the diagnostic ability of SNB and Facial angles in class II malocclusion. The aim of this study was to evaluate sensitivity and specificity of SNB and Facial angle in diagnosing anteroposterior position of mandible in patients with skeletal class II malocclusion.Material and Methods: Pretreatment cephalograms of 76 patients with skeletal class II malocclusion were assessed in this study. Sensitivity and specificity of SNB and Facial angles were determined using SPSS and ROC (Receiver Operative Characteristics) curves.Results: Sensitivity and specificity of Facial angle were 61 and 70 percent, respectively. The corresponding values for SNB angle were 40 and 86 percent. The highest sensitivity and specificity for SNB and Facial angles related to 75.5 and 79.5 degrees, respectively.Conclusion: The findings showed that in diagnosing mandibular anteroposterior position of class II patients, Facial angle is more sensitive and SNB angle is more specific. Moreover, it is suggested that in cephalometric analysis, patients with Facial and SNB angles less than 79.5 and 75.5 degree respectively, be assumed to have skeletal class II malocclusion.
Mohammad Basafa; M. Shahabee
Abstract
Introduction: The main object of this study was to find out the correlation between types of malocclusion and temporomandibular joint (TMJ) disorders among students.Materials and methods: This study was descriptive and cross-sectional in which 425 persons were examined. From this number, 308 persons ...
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Introduction: The main object of this study was to find out the correlation between types of malocclusion and temporomandibular joint (TMJ) disorders among students.Materials and methods: This study was descriptive and cross-sectional in which 425 persons were examined. From this number, 308 persons were male, and 117 were female. All samples were students of Mashhad University of Medical and Dental Sciences. The range in age was 19 to 32 years with a mean of 26.1 years. Samples were selected randomly. SPSS soft ware was used and statistic evaluation was done.Results: The correlation between malocclusion and TMJ discomfort at a level of ?=0.05 was not signifi-cant. The highest level of correlation existed between TMDs and CI II malocclusion. The rate of TMJ dis-comfort in various types of malocclusion was respectively as follow: CI II>CI I>CI III. The correlation between TMJ discomfort and head, neck and back pain was meaningful (P=0.0298). The rate of women with TMJ discomfort to men was 1.6: 1. Most patients with TMJ discomfort complained of joint noises and a small number of them remarked symptoms such as pain, jaw opening limitation, and other symptoms of the disorder. Joint noises were mainly in the form of clicking. TMJ discomfort accompanied by gastric dis-order (generally speaking) was meaningful (P=0.0214).Conclusion: From this study it was concluded that there was no significant correlation between maloc-clusion and TMJ discomfort at a level of α=0.05 among students. The highest level of correlation, which still was not statistically significant, existed between TMDs and CI II malocclusion. The correlation between TMJ discomfort and head, neck and back pain was significant. It is suggested that specific studies be done to clear out the exact relation between gastric disorder and TMJ discomfort.