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EFFECT OF ETCHING TIME ON BONDING STRENGTH OF ACID-ETCHED ENAMEL AFTER APPLYING TOPICAL FLUORIDE AGENTS

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Abstract

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The purpose of this in vitro study was to determine the effect of etching time on
bonding strength of composite resin after applying topical fluoride agents to the primary
anterior teeth when the acid-etching technique was used in pedodontic treatment.
The shear bond strength of composite resin was tested with instron and surface
topography was examined with a Scanning Electron Microscope.
The results were as follows :
1. Resin bond strength of experimental group A which was applied topical fluoride
agents, etched for 30 seconds was very weak
2. Resin bond strength of experimental group C which was applied topical fluoride
agents, etched for 120 seconds was approach to that of control group,
3. After applying topical fluoride agents, the more the etching time was increased, the
more adherent surface coating was removed.
4. The more the etching time was increased, the more the etching degree was.

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