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(5) 根据牙冠部各部分的比例进行年龄推断。魏博源等(1983)曾对第一磨牙内部构造与年龄的关系进行了研究,提出用髓室牙本质指数判别年龄的方法。其步骤:①制作牙磨片。在第一磨牙颊侧根分叉处与牙冠颊面中部,按颊舌方向制作牙齿纵磨片。②显微测量。将磨片置于载玻片上,放在显微镜下用测微器测量。为了测量的一致性,首先确定三条基线:
(5) Based on the proportion of the various parts of the crown to infer the age. Wei Boyuan et al. (1983) studied the relationship between the internal structure and the age of the first molars, and proposed the method of determining the age by the pulp chamber dentin index. The steps: ① making toothpick. In the first molar buccal root bifurcation and crown buccal middle, according to the buccal and lingual direction of the vertical longitudinal grinding. ② microscopic measurement. Place the plate on a glass slide and place it under a microscope and measure with a micrometer. In order to measure the consistency, first determine three baselines: