关键词: 生长型, 上颌第一磨牙, 牙槽骨厚度, 正常牙合, 锥形束计算机断层扫描

Abstract:

Objective    To determine the differences in alveolar bone thickness of the maxillary first molar using cone-beam computed tomography（CBCT）in normal occlusions with different growth patterns. Methods    The sample comprised 82 normal occlusions，19 to 40 years old； 32 displayed the vertical growth pattern，and 50 showed the horizontal growth pattern. CBCT scans were taken and four levels on the coronal plane at three roots of the maxillary first molar were used to measure the alveolar bone thickness of the maxillary first molar and compare the differences between the two groups. Results    The long-faced group had smaller buccal alveolar bone thickness than the short-faced group on several selected levels. Moreover，the buccal alveolar bone thickness of the distal buccal root was greater than those of the mesiobuccal root of the upper first molar on several selected levels. Conclusion    The alveolar bone thickness of the maxillary first molar may be affected by growth patterns.

Key words: growth pattern；the maxillary first molar；alveolar bone thickness；normal occlusion；cone-beam computed tomography, CBCT