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研究对象和方法 对527例牙位异常和萌出困难的患者进行X线检查,男242例,女285例;年龄11～15岁26例,16～20岁44例,21～30岁98例,31～40岁217例,41～50岁87例,51～60岁55例。X线检查包括摄口内牙片和口外摄颌骨片及曲面体层摄影。 结果和讨论 垂直阻生190例(男100例,女90例),远中面至下颌支前缘的距离:10mm左右45例,1.5～3.0mm52例,部分牙冠被升支前缘遮盖93例。显然,萌出困难和后方颌骨体长度不足有关;此外,牙根弯曲69例,由于牙骨质增生致牙根
Subjects and Methods X-ray examination was performed on 527 patients with dental anomalies and eruptions, including 242 males and 285 females; 26 patients aged 11-15 years, 44 patients aged 16-20 years, 98 patients aged 21-30 years, 217 cases of age from 31 to 40, 87 cases of 41 to 50 years old and 55 cases of 51 to 60 years old. X-ray examination including the mouth of the oral and extraoral film jaw bone and surface tomography. RESULTS AND DISCUSSION The vertical occlusion was performed in 190 cases (100 males and 90 females). The distance from the distal face to the mandibular anterior margin was 45 cases of about 10 mm and 1.5 to 3.0 mm in 52 cases. Some of the crowns were covered by the leading edge of ascending branch example. Obviously, the difficulty of eruption and the length of the rear jaw body is insufficient; In addition, root bending in 69 cases, due to tooth growth caused by tooth root