Tsai H H
Department of Pedodontics, School of Dentistry, China Medical College, Taichung, Taiwan.
J Clin Pediatr Dent. 2001 Fall;26(1):61-4.
This study investigated the developmental changes of mandibular permanent canines and premolars in early mixed dentition using panoramic radiographs. Positions of cusps and root apices of the teeth relative to the inferior border of mandible were evaluated. The developmental stages of the teeth were divided into three stages. There were few changes in the inclination of the three teeth. The permanent canine began to erupt before stage 2 and the second premolar began to erupt after stage 2. The distance between the inferior border of the mandible and apices of the three teeth was almost fixed in early mixed dentition.
本研究使用全景X线片调查了混合牙列早期下颌恒牙尖牙和前磨牙的发育变化。评估了牙齿牙尖和根尖相对于下颌下缘的位置。牙齿的发育阶段分为三个阶段。这三颗牙齿的倾斜度变化很小。恒牙尖牙在第2阶段之前开始萌出，第二前磨牙在第2阶段之后开始萌出。在混合牙列早期，下颌下缘与这三颗牙齿根尖之间的距离几乎是固定的。
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