ratio of decayed and filled surfaces

ra·ti·o of de·cayed and filled sur·fac·es (RDFS),

an index of decayed and filled permanent surfaces per person, per full complement of 122 tooth surfaces.

ra·ti·o of de·cay·ed and fill·ed sur·fac·es

(RDFS) (rāshē-ō dĕ-kād fild sŭrfăs-ĕz)
Index of such permanent surfaces per person, per full complement of 122 tooth surfaces.