Areas of subgingival calculus were selected from 6 freshly extracted human teeth with periodontal disease.
选取6颗新近拔除的有明显龈下牙石的牙周病患牙.
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AIM : To observe the effect of hybrid subgingival scaling ( combining ultrasonic scaling with hand scaling ) by SEM.
目的: 超声 龈 下刮治结合手工刮治,用扫描电镜的方法观察效果.
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