Kajii Takashi S, Fujita Takahiro, Sakaguchi Yui, Shimada Kaoru
a Section of Orthodontics, Department of Oral Growth and Development , Fukuoka Dental College , Fukuoka , Japan.
b Division of Basic Nursing , Fukuoka Nursing College , Fukuoka , Japan.
Cranio. 2019 Jul;37(4):264-271. doi: 10.1080/08869634.2017.1421446. Epub 2018 Jan 23.
To evaluate whether osseous changes of the temporomandibular joint (TMJ) condyle affect backward rotation of the mandibular ramus in Angle Class II orthodontic patients with idiopathic condylar resorption (ICR). Twenty Japanese women with Class II malocclusion with ICR (ICR group) and 24 women with Class II malocclusion without ICR (non-ICR group) were examined. Pre-treatment panoramic radiographs were used to measure condylar ratios. Pre-treatment lateral cephalograms were used to evaluate maxillofacial morphology. The ICR group had a significantly smaller condylar ratio, greater backward rotation of the ramus, less labially inclined upper incisors, and a steeper occlusal plane. The increased backward rotation of the ramus in the ICR group was significantly associated with a smaller condylar ratio. Angle Class II patients with ICR had shorter condylar height attributable to osseous changes of the TMJ condyle, and the shorter condylar height may affect subsequent backward rotation of the ramus.
评估颞下颌关节（TMJ）髁突的骨质改变是否会影响患有特发性髁突吸收（ICR）的安氏II类正畸患者下颌升支的向后旋转。对20名患有ICR的安氏II类错牙合日本女性（ICR组）和24名无ICR的安氏II类错牙合女性（非ICR组）进行了检查。使用治疗前全景X线片测量髁突比率。使用治疗前侧位头影测量片评估颌面形态。ICR组的髁突比率显著更小，升支向后旋转更大，上切牙唇倾度更小，咬合平面更陡。ICR组升支向后旋转增加与髁突比率更小显著相关。患有ICR的安氏II类患者由于TMJ髁突的骨质改变导致髁突高度较短，而较短的髁突高度可能会影响随后升支的向后旋转。
