ADA specification number for Resin Based Restorative material is:: (A) 26, (B) 27, (C) 28, (D) 30
Answer is B. ANSI/ADA Specification No. 27—Resin-Based Filling Materials: 1997.
This standard specifies requirements for dental resin-based restorative materials supplied in a form suitable for mechanical mixing, hand mixing, or external energy activation.
Ref: Philip’s Science of Dental Materials , Anusavice , 11th edition