Department of Family Dentistry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China.
School of Dentistry, National Defense Medical Center, Taipei, Taiwan, Republic of China.
PLoS One. 2020 Dec 2;15(12):e0242717. doi: 10.1371/journal.pone.0242717. eCollection 2020.
Cervical atlas alignment changes are associated with craniofacial development. Disturbance of craniofacial development may be associated with temporal mandibular joint function. Therefore, we examined the possibility of a correlation between unilateral missing teeth and morphologic changes of the spine and posture. We collected eighty-nine patients (38 men and 51 women) with unilateral posterior missing teeth and twenty patients without previous orthodontic treatment or missing posterior teeth by tracing and analyzing their panoramic and cephalometric film. We measured the angulations of articular eminence, cranio-cervical angle, and the percentage of the occlusal plane passing through the first and second cervical vertebrae with other morphologic geometric data. The angle of articular eminence inclination was higher in the non-missing teeth group than the missing teeth group (46.66° and 42.28°, respectively). The cranio-cervical angle was smaller in the missing posterior teeth group than the non-missing posterior teeth group (99.81° and 103.27°, respectively). The missing teeth group also showed fewer occlusal planes passing through the intersection of the first and second cervical vertebrae compared to the non-missing teeth group (28.9% and 65%, respectively). Individuals with unilateral missing teeth had lower articular eminence inclination, smaller cranio-cervical angle, and a lower percentage of the occlusal plane passing through the intersection of the first and second cervical vertebrae.
颈椎关节突关节排列改变与颅面发育有关。颅面发育障碍可能与颞下颌关节功能有关。因此，我们研究了单侧后牙缺失与脊柱和姿势形态变化之间相关性的可能性。我们通过追踪和分析全景片和头颅侧位片，收集了 89 名单侧后牙缺失患者（38 名男性和 51 名女性）和 20 名无正畸治疗或缺失后牙的患者。我们测量了关节突倾斜角、颅颈角和通过第一、二颈椎的咬合平面百分比，以及其他形态学几何数据。非缺失牙组的关节突倾斜角高于缺失牙组（分别为 46.66°和 42.28°）。缺失后牙组的颅颈角小于非缺失后牙组（分别为 99.81°和 103.27°）。缺失牙组通过第一、二颈椎交点的咬合平面也明显少于非缺失牙组（分别为 28.9%和 65%）。单侧后牙缺失患者的关节突倾斜度较低，颅颈角较小，通过第一、二颈椎交点的咬合平面比例也较低。
