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经过86例4年的临床观察，证明空管药物疗法具有疗程短、操作简化同时又能取得满意效果等优点。特别对于前牙、尖牙效果更好。
After 86 cases of 4 years of clinical observation, it is proved that the empty tube drug therapy has the advantages of short treatment period, simplified operation and satisfactory results. Especially for the front teeth, fangs better.