Chalala Chimène, Ghafari Joseph G
Departments of Orthodontics and Dentofacial Orthopedics, Lebanese University and American University of Beirut, Beirut, Lebanon.
Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut, Beirut, Lebanon.
PeerJ. 2019 Dec 10;7:e8200. doi: 10.7717/peerj.8200. eCollection 2019.
To define midfacial position differentiating maxillary and zygomatic regions and to evaluate the corresponding cephalometric characteristics discerning midfacial flatness and fullness.
A total of 183 pretreatment lateral cephalometric radiographs of non-growing orthodontic patients (age 25.98 ± 8.43 years) screened at our university orthodontic clinic. The lateral cephalographs of the orthodontic patients were stratified in four groups: , , , ,according to distances from nasion and sella to points J and G (NJ, SJ, NG and SG). J is the midpoint of the distance connecting orbitale to point A, and G the center of the triangle connecting orbit, key ridge and pterygomaxillary fissure. Statistics included the Kendall tau-b test for best associations among measurements.
All measurements were statistically significantly different between and groups. The highest associations were between NJ and SJ (τ = 0.71; < 0.001) and NG and SG (τ = 0.70; < 0.001). Flat midfaces were characterized by canting of the cranial base and palatal plane, hyperdivergent pattern and maxillary retrognathism. The opposite was true for fuller midfaces.
Midface skeletal location was assessed differentially in the naso-maxillary and malo-zygomatic structures differentially. Craniofacial characteristics were identified according to this stratification, indicating the potential for application in facial diagnosis and need for testing on 3D cone-beam computed tomography images.
定义区分上颌和颧骨区域的面中部位置，并评估辨别面中部扁平度和丰满度的相应头影测量特征。
在我校正畸诊所筛选出183例未生长发育的正畸患者（年龄25.98±8.43岁）治疗前的头颅侧位X线片。根据鼻根点和蝶鞍点到J点和G点的距离（NJ、SJ、NG和SG），将正畸患者的头颅侧位片分为四组： ， ， ， 。J是连接眶下点到A点距离的中点，G是连接眼眶、颧突和翼上颌裂的三角形的中心。统计分析包括测量值之间最佳相关性的肯德尔tau-b检验。
组和 组之间所有测量值均有统计学显著差异。NJ与SJ之间的相关性最高（τ = 0.71；P < 0.001），NG与SG之间的相关性最高（τ = 0.70；P < 0.001）。面中部扁平的特征是颅底和腭平面倾斜、高度散开型和上颌后缩。面中部丰满的情况则相反。
在鼻上颌和颧骨颧弓结构中对面中部骨骼位置进行了差异评估。根据这种分层确定了颅面特征，表明其在面部诊断中的应用潜力以及在三维锥形束计算机断层扫描图像上进行测试的必要性。
