The patient group was divided into three groups, which were ventricular septal defect group, atrial septal defect group and patent ductus arteriosus group.

病人组根据先心病类型分为室间隔缺损组、房间隔缺损组、动脉导管未闭组；

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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).

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；

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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).

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；

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