Methods : we have divided the 636 molars ( without dental caries or pathological changes of root ) collected in school of forensic medicine and stomatological hospital in shanxi medicine university into four groups : maxl, max2, manl, man2, and selected 5 indexes closely related to changes of dental age ( dental attrition, contact area, the index of dentine marrow cavity, the thickness of cementum of root, the diaphaneity of dentine of root ), and proposed the grading standard and scoring standard date processing and statistical analysis after measuring the teeth of the four groups
方法：從山西醫科大學法醫學院及口腔醫院收集的636磨牙（無
齲壞、無根尖病變）分為max1 、 max2 、 man1 、 man2四組，根據牙齒的增齡變化特
點，篩選了5個與牙齡變化密切相關的指標（牙齒的磨耗、接觸區面積、牙本質髓室指數、根尖牙骨質的厚度、根尖牙本質透明） ，提出了指標的分級標準和評分標準，對各組的牙齒測量后進行數據處理和統計分析。
The skin should be examined for dryness, scaliness, atrophy, petechiae, and ecchymoses, and the mouth for angular stomatitis, glossitis, swollen or bleeding gums, and decayed teeth
皮膚應檢查有無乾燥、鱗屑、增生、瘀
點及瘀斑；口腔應檢查有無口角炎、舌炎、腫脹、齒齦出血和
齲齒。
The investigation on natural anticariogenics has become one of the highlights now. chinese scholars have made great progresses in this aspect. they established oral ecosystem model to evaluate natural anticariogenics, studied the pharmacodynamics of effective constituents and their anticarious mechanisms, and standardized screening experimental methods. the review is to overview the progresses of natural anticariogenics
天然藥物防
齲是目前研究的熱
點，我國學者在天然藥物防
齲研究方面取得很大的進展，建立了藥物防
齲效果評價的口腔生態模型，對防
齲天然藥物進行有效成分藥效學研究和防
齲機制等系統研究，規范了藥物防
齲篩選實驗方法。
When dentist richard hansen goes after a cavity or cleans a root canal, his patients barely hear a thing
當牙醫理查德?漢森檢查齲洞或清洗牙槽的時候，他的病人只會聽到一點聲音。
