Primary molar filled with a temporary restoration classification

According to WHO 1997 classification, a primary molar filled with a temporary restoration is classified as:

A. Sound tooth 
B. Filled but Decayed
C. Filled but non-decayed 
D. Decayed tooth.

Answer. (D) Decayed tooth.

• Page 190 of the text mentions that the def index, described by A.O.Gruebbell in 1944, as an equivalent index to DMF index for measuring the dental caries in primary dentition.

• The caries indices used in primary dentition are deft and defs index equivalent to DMFT & DMFS indices used in permanent dentition.

• The basic principles and rules for def index are same as that for DMF index.