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¿˜¹¼ØÃÒ¡¿˜¹ÊÒÁÒöÇÑ´ä´Œ·Ñé§ ÃŒÍÂÅФÇÒÁªØ¡ (Prevalence) ËÃ×Í ¤‹Òà©ÅÕè¨ӹǹ´ŒÒ¹·Õ è

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1. Root caries index (RCI) (Katz, 1980)

2. Root surface severity index (Billing and et al., 1985)

3. C-Root caries (ICDAS II)

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