Etching
u
37% Orthophosphoric Acid
u
Gel vs. Liquid: No Difference in
Penetration, Bond Strength, Retention
u
20 Second Etch Time vs. 60 Seconds:
No Difference
u
Primary Teeth Do
NOT
Require
Extended Etch or Roughening
u
Etch Must Extend 2 mm Beyond
Fissures