【名词&注释】
就位道(path of removal)、第三磨牙伸长(hyper-erupted third molar)、观测线、牙长轴(dental long axis)、外形高点(height of contours)、注射硬化剂(injection of sclerosing agent)
[单选题]遮色瓷厚度应掌握在
A. 1~2mm B. 1~0.2mm C. 2~0.3mm D. 2~3mm E. 越薄越好