Frequency of Hypodontia in Various Malocclusions in Patients Referring to Orthodontics Ward of Yazd Shahid Sadoughi University of Medical Sciences

The incidence of hypodontia is frequently observed in the dental patients. Considering that a comparison of the prevalence of malocclusion in various racial and ethnic groups can lead us towards the etiology of malocclusion  and  guid us to appropriate prophylactic therapies, the current study aimed to investigate the relationship between hypodontia frequency and various malocclusions.

This retrospective study was conducted on 405 orthodontic patients with mean age of 15.8 and age range of 15-25 selected based on their diagnostic records who suffered from class I, II, and III skeletal malocclusions . Cephalometric Wits index and ANB angle criteria were used in order to divide the patients into class I (ANB>1-4 degrees), class II (ANB>4 degrees), and class III (ANB≤1 degree) malocclusion. To investigate the dental missing, panoramic radiographs and patientschr('39') records wereutilized. The gleaned data were submitted in to SPSS 17 and analyzed using T-test, ANOVA, and Chi-square tests.

In the present study, out of 405 patients, 251 (62%) patients were females and 154 (38%) were males. The prevalence rate of hypodontia in orthodontic patients was 14.56% with inclusion of the third molar and 5.16% with exclusion of the third molar tooth. The frequency of various types of hypodontia in class I malocclusion was significantly greater than other types of malocclusion (P (P.V =0.02)<span style="font-family:;" dir="RTL" roman";"="" new="" "times="" roman";="" nazanin";="" b="" 11.0pt;="" 14pt;="" lang="AR-SA">.