Estomaguio Gary A, Yamada Kazuhiro, Ochi Kanako, Hayashi Takafumi, Hanada Kooji
Division of Orthodontics, Department of Oral Biological Science, Section for Oral Life Science, Graduate School of Medical and Dental Sciences, Niigata University, Japan.
Cranio. 2005 Oct;23(4):257-63. doi: 10.1179/crn.2005.036.
This study investigated the association of craniofacial and glenoid fossa shapes and temporomandibular joint (TMJ) pathology in 39 orthodontic patients with signs and symptoms of TMJ disorders, using helical CT scans. Cephalometric measurements showed that 21 subjects with bilateral condylar bone change (BBC) had significantly smaller SNB angles, ramus heights and S-Ar/N-Ba ratios, as well as larger mandibular plane angles and lower anterior facial height than the 18 subjects with no condylar bone change (NBC). The average posterior slope of the left and right articular eminence in their central and lateral sections was significantly steeper in NBC than in BBC. Condylar bone change might, therefore, not only be related to the morphology of the mandible, but also of the glenoid fossa and cranial base. This appears to reflect adaptive changes in the condyle, articular eminence and cranial base in response to changes in loading.
本研究利用螺旋CT扫描，调查了39名有颞下颌关节紊乱体征和症状的正畸患者的颅面及关节窝形状与颞下颌关节（TMJ）病变之间的关联。头影测量显示，与18名无髁突骨改变（NBC）的受试者相比，21名有双侧髁突骨改变（BBC）的受试者的SNB角、升支高度和S-Ar/N-Ba比值明显更小，而下颌平面角更大，前面部高度更低。NBC受试者左右关节结节中央和外侧部分的平均后倾斜率比BBC受试者明显更陡。因此，髁突骨改变可能不仅与下颌骨的形态有关，还与关节窝和颅底的形态有关。这似乎反映了髁突、关节结节和颅底为应对负荷变化而发生的适应性改变。
