The size variation and related implications of mandibles in northern China in the past 7000 years

To better understand variation of Holocene Chinese mandiblular morphology, a study was conducted on 23 metric traits of Neolithic (n=54), Bronze-Iron Ages (n=184) and modern (n=92) adult male mandibles from northern China. Results indicate that the linear characters of these Chinese mandibles evolved in the past 7000 years. From the Neolithic to Bronze-Iron Ages to present day, the overall size of mandibles decreased. The linear characters of the mandiblular features varied between different time periods. The decrease of thickness and height of the mandibular corpus primarily occurred during the Neolithic to Bronze-Iron Ages. The decrease in main size was during the Bronze-Iron Ages to present day. It is possible that mandibles became thinner before the overall size decreased. Comparisons also indicate that the bottom part of the face may have decreased more greatly in breadth than the upper portion. The decrease in mandible size may be associated with changes in climate and diet, and with changes in the craniums size.     

纯钛作为医学材料在口腔医学中的应用

文章通过对生物医学材料纯钛的综述 ,着重分析了其在口腔医学领域中的新应用———TSO固定术治疗下颌骨髁突骨折。通过相关的研究工作和临床资料、经验的积累 ,得到了满意的研究结果     

3个实验小鼠品系下颌骨变量波动性不对称

了解不同实验小鼠下颌骨变量波动性不对称性(FA)特征.对3个实验小鼠品系的下颌骨11个变量进行测量.3个小鼠品系是KM 58例(♂31,♀27),ICR 20例(♂10,♀10)和BALB/c 20例(♂10,♀10).采用SPSS13.0统计软件进行数据分析,Kolmogorov-Smirnov用来检验FA值的正态分布,参数检验ANOVA和非参数统计检验Mann-Whitney用来检验FA值在性别之间和品系之间差异.结果表明不同品系之间FA值变化有一定差异;3个品系中有一个品系的FA值存在性差.3个品系之间FA值出现差异主要原因是出生后环境的影响,遗传因素影响较小.