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目的：观察监测恒磨牙正畸期间龋病的发生和发展。方法：使用激光龋齿诊断仪对74名12～16岁正畸青少年183个牙进行为期1年的观察监测。结果：183个牙1年内有14．8％的可疑龋发展为需充填龋。结论：应用龋齿激光诊断仪对青少年正畸牙齿的龋病发生状况可起到良好的监测作用。“,”AIM:To observe and monitor the progress of suspicious caries in orthodontic youth’s perma-nent molars.METHODS:DIAGNOdent was used in 74 orthodontic patients aged 12-16 yeas to monitor 183 perma-nent molars for the diagnosis of early caries for one year.RESULTS:14.8%early caries turned to caries and needed filling treatment within 1 year.CONCLUSION:Application of DIAGNOdent can effectively monitor early caries in or-thodontic youths.