Zeng X L
School of Stomatology, Beijing Medical University.
Zhonghua Kou Qiang Yi Xue Za Zhi. 1991 May;26(3):149-52, 190-1.
Lateral cephalograms of 140 growing subjects with normal occlusion from Beijing were computerized and analyzed. Cephalometric standards of three occlusion developmental stages, Hellman's IIA, IIIB and IVA, were obtained and evaluated in three groups as facial skeleton, jaw bases and dentoalveolar relationship, which are specifically useful for diagnosis and treatment planning with functional appliances.
对140名来自北京、具有正常咬合关系的生长发育期受试者的头颅侧位片进行了数字化处理和分析。获得了三个咬合发育阶段（赫尔曼IIA、IIIB和IVA）的头影测量标准，并在面部骨骼、颌骨基底和牙-牙槽关系三个组中进行了评估，这些标准对于使用功能性矫治器进行诊断和治疗计划特别有用。
