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[Study of mandibular anterior alveolar bone thickness in subjects with different facial skeletal types]
Jia-ling Li1, Xiao-bing Li, Jia-yuan Li
1Dept. of Orthodontics, The Stomatological Hospital Affiliated to Medical School of Nanjing University, Nanjing 210008, China.
Objective:
To study the association of vertical facial skeletal types and sagittal facial skeletal types with anterior alveolar bone thickness.
Methods:
Among 168 cases with malocclusion in early permanent dentition stage, 93 patients were male and 75 patients were female. All patients (aged 10-14 years) were divided into 9 groups by different facial skeletal types, mandibular anterior alveolar bone thickness in patients' lateral cephalometric films were measured. ANOVA were performed to measurement results with the SPSS 13.0 statistical software.
Results:
Though sagittal facial skeletal types were the same, there were significant differences between different vertical facial types groups. The order was low-angle group, average-angle group and high-angle group according to the size. A high-angle individual often had a thin anterior alveolar bone while a low-angle individual often had the opposite morphology character. There was no statistical significance between skeletal type I, II and III. But group of skeletal type III also had a thin alveolar bone thickness which had no significant difference with high-angle group. Low-angle group III had no significant difference with average-angle group I and II in alveolar bone thickness.
Conclusion:
Sagittal facial skeletal types have little influence on anterior alveolar morphology, but the vertical facial skeletal types have strong connection with anterior alveolar bone thickness.
