453.The lower lip gets sensory supply through the

a.Buccal branch of facial nerve

b.Buccal branch of mandibular nerve

c.Mandibular branch of facial nerve

d.Mental nerve

Ans-d.Mental nerve

452.Which cement has high solubility and disintegrates readily in oral fluids

a.Silicates

b.GIC

c.Zinc Polycarboxylate

d.Zinc phosphate cement

Ans-a.Silicates

451.The first porcelain tooth material was introuced by

a.Dechemant
b.Ash
c.Plateau
d.McClean

Ans-a.Dechemant
Ref-Phillips 11nth ed pg 660