prevalence of Anterior Open Bite and the associated dentoskeletal malformations in 9-14 year-old students of Qazvin

ABSTRACT

Anterior Open Bite [AOB] is one of the most severe orthodontic diseases to treat and often with poor prognosis. However, an early diagnosis accompanied with proper evaluation of etiological factors may lead to a shorter therapeutic period and also a better prognosis. To determine the prevalence of AOB and the associated clinical and cephalometerical changes in 9-14-year-old students of Qazvin. 1461 students [males 701, female 760] were evaluated and AOB was found in 56 students [32 boys and 24 girls]. Thirty students out of 56 were referred to the School of Dentistry for a lateral cephalometric radiography. Thirty lateral cephalogram x-rays were also taken from students with normal occlusion as control group. The prevalence of AOB in 9-14-year-old students in Qazvin was 3.83% which was significantly higher in girls than boys. From a cephalometric point of view, the articular, gonial, sum of post, SN-MP and basal angles significantly increased but UAF/LAFH and UAFH were decreased. Patients with Anterior Open Bite showed a downward backward lower jaw rotation with a growth pattern in their faces more vertical than horizontal. The posterior upper teeth in patients were also over-erupted which must be considered in treatment plan