526 this ticket entitles you to a free manl in our new restaurant 這張票可以讓你在我們新開張的參觀里大吃一頓
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(yī)科大學法醫(yī)學院及口腔醫(yī)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(jù)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(qū)面積、牙本質髓室指數(shù)、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(shù)據(jù)處理和統(tǒng)計分析。