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本文对因正畸矫正而拔除的年青上颌第一双尖牙进行牙面形态、牙根及根管数目的观察和牙体测量。1983—1984年,在南医附属口腔门诊部因矫正牙颌畸形(13—20岁)而拔除的104颗上颌第一双尖牙作为观察、测量对象。牙面形态的观察,包括颊、舌两尖的偏向;近、远中沟的止点以及近中面近颈部的凹陷。牙体测量,包括全长(牙尖至根尖的垂直距离);根长(颈缘上向根尖的最突点到根尖的垂直距离);冠长(全长减去根长);冠宽(近中接触区与远中接触区间距)。用准确度为0.02mm的游标卡尺直接测量,每项均测两次,用其平
This article on the orthodontic and removal of the first maxillary second premolar tooth morphology, root and root canal number observation and dental measurements. In 1983-1984, 104 maxillary first bicuspid teeth were removed from orthodontic dental clinics in South Medical College for correction of dento-mandibular deformities (13-20 years old) for observation and measurement. Observation of the shape of the tooth surface, including the buccal, lingual tip deflection; near and far in the ditch and near the midpoint near the neck depression. Tooth measurements, including full length (cusp to root tip vertical distance); root length (vertical distance from the most prominent point on the neck margin to apical root); crown length (total length minus root length); Crown width (near the contact area and the distance from the contact area). With the accuracy of 0.02mm vernier caliper direct measurement, each measured twice, with its flat