Acid etching of the enamel, or enamel conditioning is an important technique in clinical practice. 37% phosphoric acid is used for this procedure.
Stages in acid etching of enamel
Stage 1: Acid removes plaque and other debris along with thin layer of enamel.
Stage 2: It inceases the porosity of exposed surfaces through selective dissolution of crystals which provides a better bonding surface for the restorative and adhesive materials.
Patterns in acid etching of enamel
Type I: It is the most common characterized by preferential removal of rods.
Type II: It preferentially removes the interrod enamel and rod remains intact.
Type III: It is irregular and indiscriminate.
Uses
It is used for
1. Fissure sealants
2. Bonding of restorative materials to enamel
3. Cementing of orthodontic brackets to the tooth surfaces
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