LaMastra S J
Am J Orthod. 1981 Apr;79(4):416-23. doi: 10.1016/0002-9416(81)90383-3.
The purpose of this study was to explore the changes in points A' and B' which occur in the soft-tissue profile of the face and their interrelationship to concomitant changes in the underlying hard tissue after orthodontic treatment. Pre- and posttreatment lateral cephalometric radiographs of forth Class II. Division 1 patients were studied to determine the relationships between the distal movements of osseous points A and B and the corresponding overlying labial soft tissues. Perpendicular lines were drawn to sella, point A, superior labial sulcus (point A'), point B, and the inferior labial sulcus (point B') from the Frankfort horizontal plane. Linear measurements were taken from the above-mentioned four intersects to the sella intersect. Pretreatment and posttreatment measurements were analyzed statistically and it was found that the average ratios between hard- and soft-tissue changes were point A to point A', 1.40 to 1.00, and point B to point B', 1.09 to 1.00.
本研究的目的是探讨正畸治疗后面部软组织侧貌中A'点和B'点的变化，以及它们与下方硬组织相应变化之间的相互关系。对40例安氏II类1分类患者治疗前和治疗后的头颅侧位片进行研究，以确定骨性A点和B点远中移动与相应覆盖唇软组织之间的关系。从法兰克福平面分别向蝶鞍、A点、上唇沟（A'点）、B点和下唇沟（B'点）作垂线。从上述四个交点至蝶鞍交点进行线性测量。对治疗前和治疗后的测量结果进行统计学分析，发现硬组织与软组织变化的平均比值为A点与A'点之比为1.40比1.00，B点与B'点之比为1.09比1.00。
