Dentofacial Morphologic Analysis For The Patients With Congenital Absence Of Lower Incisor In Jinan

[Objective] The purpose of this study was to analyze the dentofacial morphology of the patients with congenital lower anterior teeth in Jinan and to know better about the influence on dentofacial growth ,with the examination of congenital absence classification, occlusal characteristics, arch width and length ,Bolton and cephalometric analysis .[Methods] Conducting and comparing the Bolton and cephalometric analysis , arch length and width of the 60 patients with congenital lower anterior teeth with that of the normal ones. Students' t-test was used to determine if there were significant differences between the two groups with SPSS 11.5 software.[Results] The incidence of patients with congenital lower anterior teeth in Jinan was 6.28%.There were 40 female of the total 60 patients, with ratio 66.7% ; 20 male , with the ratio 33.3%.Among them 32 patients were with only one incisor absence , with ratio 53.3% ;28 patients with two incisors congenital missing, with ratio 46.7%.Among the 60 patients there were 35% skeletal type I, 60% skeletal type II,5% skeletal type III; the constituent ratio of vertical skeletal type was: average vertical skeletal type 45%, larger vertical skeletal type 40%,lower vertical skeletal type 15%.Bolton analysis of the patients was smaller than the normal ones. There was significant difference in the lower anterior arch length and width between the two...