دراسة استعادية لتوزع الغياب الخلقي للأسنان الدائمة و انتشاره عند مرضى تقويم الأسنان في مدينة دمشق

Abstract EN

Background & Objective: To record the prevalence and distribution of congenitally missing permanent teeth and their relation to gender in a sample of patients in an orthodontic clinic in Damascus.

Methods & materials: The sample of the study consists of 1106 patients from an orthodontic clinic in Damascus.

Their ages ranged between 10-27 years.

The clinical and panoramic radiographs data of the missing permanent teeth were analyzed.

Pearson Chi square was used (P=0.05) for significant difference according to gender.

Results: The missing teeth were 405 teeth in 98 patients (8.86%).

The most frequently missing teeth (except third molars) were the upper lateral incisors (36%), lower second premolars (28%), lower incisors (9%), upper second premolars (9%), upper first premolars (6%) then second lower molars (5%).The missing of canines , upper second molars and upper central incisors was rare , the congenitally missing of first molars was not noticed.

Eighty eight percent of patients had more than one missing tooth, the mean of the missing teeth (except third molars) for males was 2.16 teeth, whereas for females 2.36 teeth with no significant difference between them (Person Chi2 =0.757).

Conclusion: The percentage of congenitally missing teeth is high, especially for upper lateral incisors and lower second premolars.

It is recommended that routine panoramic radiographs should be ordered for patients before treatment specially if one of the permanent teeth was missing or in case of retained primary teeth.