Record base thickness over crest & facial slope of ridge should be?: (A) 1 mm, (B) 2 mm, (C) 3 mm, (D) 4 mm
Answer is A. Record base thickness:
Crest & facial slope of ridge = 1 mm (Less thickness helps to provide additional space for teeth placement)
Hard palate & Lingual flange in mandibular denture base = 2 mm (Provide strength & rigidity)