A Survey Of Odontodysplasia In Permanent Teeth Of 5150 Students With Different Nations In Xinjiang

Objective: To obtain the status of Odontodysplasia in permanent teeth of the undergraduates in Xinjiang,compare the difference between nations. Methods:A survey was carried out in 5150 students in Xinjiang with the method of random,stratified,cluster sampling during 9,2008 to 5,2009. Results:569 persons have dental number and morphology anomalies within all 5150, the prevalence is 11.05%, oligodontia is the highest, 5.98%, and the second is conic shaped teeth, 3.55%. Oligodontia: missing number, mandible is more than maxilla in population and Han(P<0.05); miss 1 tooth is the situation which most occurred; prevalence, Han(6.76%) is higher than Uyghur(4.66%)(P<0.05),female is higher than male within Uyghur(P<0.05).Supernumerary tooth: male's prevalance is higher than female's in population and Han(P<0.05), abnormal central cusp is opposite. Dens invaginatus: Male's prevalance is higher than female's within Han(P<0.05). Location predilection: supernumerary tooth is between the maxilla center incisors; conic shaped teeth and dens invaginatus are maxilla lateral incisor; abnormal central cusp is mandible second premolar; oligodontia is mandible center incisor in population and Han, but the mandible second premolar in Uyghur. Oligodontia coincident with conic shaped teeth is the situation which most occurred. Conclusions: The odontodysplasia overall prevalence of Xinjiang undergraduates is little lower than the other researchers'reports, there is difference between the nations, Han is higher than Uyghur. Some anomalies have differences between the sex. The other results are similar to the former investigations.