7～9岁儿童乳磨牙缺损、缺失对咀嚼效能的影响

目的　研究乳磨牙缺损、缺失对7～9岁儿童咀嚼效能的影响。方法　采用吸光度法测定正常混合牙列、乳磨牙缺损、缺失混合牙列7～9岁儿童各2 6例0 .5min的咀嚼效能。结果　①乳磨牙缺损儿童与正常组儿童咀嚼效能间的差异有显著性(P <0 .0 5 ) ,前者约为后者的78.17% ;②乳磨牙缺失儿童与正常组儿童咀嚼效能间的差异有显著性(P <0 .0 0 1) ,前者约为后者的6 3.0 1% ;③乳磨牙缺失儿童与乳磨牙缺损儿童咀嚼效能间的差异无显著性(P >0 .0 5 )。结论　乳磨牙缺损及缺失都将影响儿童咀嚼效能,应尽早给予充填修复,乳磨牙残根残冠已无法充填修复时,应及时拔除。

Study on masticatory efficiency in 7～9 years old children with primary molars defect or loss

Objective To study the effect of primary molars defect or loss on masticatory efficiency in 7～9 years old children. Methods We selected three groups of 7～9 years old children:normal mixed dentition, and primary molars defect, and primary molars loss.There were 26 subjects in each group.Then we measured the semi-minute masticatory efficiency of each subject by light absorption method. Results The masticatory efficiency of primary molars defect group was significantly lower than that of normal group(P<0.05), and the ratio of the former to the latter was only 78.17%. The masticatory efficiency of primary molars loss group was significantly lower than that of normal group(P<0.001), and the ratio of the former to the latter was only 63.01%. There was no significant difference between primary molars loss group and primary molars defect group(P>0.05). Conclusion Primary molars defect and primary molars loss have significant influences on masticatory efficiency in 7～9 years old children.The patients must be treated in time.If residual root or crown could not be well treated,they should be pulled out in time.