7-9岁乳磨牙缺损患儿治疗前后咀嚼效能的变化

Comparative study on masticatory efficiency of 7～9 year-olds with primary molar defect before and after treatment

目的研究7-9岁乳磨牙缺损患儿治疗后咀嚼效能的变化。方法采用吸光度法测定7-9岁正常混合牙列儿童与乳磨牙缺损患儿治疗前、后咀嚼效能。使用SPSS11.0统计软件分析其治疗前、后咀嚼效能差别及与正常儿童咀嚼效能的差别。结果①乳磨牙缺损组治疗后咀嚼效能与治疗前差异有显著性（P〈0.001）,前者大于后者;乳磨牙缺损组治疗后咀嚼效能与正常儿童的咀嚼效能差异无显著性（P〉0.05）;②单侧或双侧乳磨牙缺损患儿治疗后咀嚼效能与治疗前均有显著性差异（P〈0.05）,前者大于后者;③1个或数个乳磨牙缺损患儿治疗后咀嚼效能与治疗前均有显著性差异（P〈0.05）,前者大于后者。结论对乳磨牙缺损的患儿不论是单侧还是双侧缺损,1个还是数个缺损,进行治疗后均可明显提高其咀嚼效能,甚至恢复至正常水平。

Objective To study the change of mastieatory efficiency in 7 - 9 year-olds with primary molar defect after treatment. Methods We selected three groups of 7 - 9 year-olds ： normal mixed dentition, primary molar defect before and after treatment, and primary molars loss.There were 36 subjects in each group. Then we measured the semi-minute masticatory efficiency of each subject by light absorption method. Results The masticatory efficiency of the primary molar defect group after treatment was significantly higher than that of the group before treatment（ P 〈 0.001）. No significant difference was found between the masticatory efficiency of the primary molar defect group after treatment and that of normal occlusal children（ P 〉 0.05）. The masticatory efficiency after treatment of one-side or two-side primary molar defect group was significantly higher than that of the group before treatment（ P 〈 0.05）. The masticatory efficiency after treatment of one or more than one primary molar defect group was significantly higher than that of the group before treatment（ P 〈 0. 05）. Conclusion The mastieatory efficiency of the primary molar defect group may increase significantly after treatment, and it may restore to the normal standard after treatment.