Abstract
A comparison was made between human enamel surfaces treated with 50 per cent phosphoric acid and those subjected to an argon-ion laser beam. Preferential loss of rod structure and the creation of inter-rod and inter-crystal porosity were characteristic of acid etching. Pits, cracks, craters and blisters were common topological features in laser enamel. The globular, frequently coalesced enamel rods and crystals differed from the spicular nature of these structures exposed by acid pretreatment. The lack of porosity and the presence of particulate surface debris following lasing did not allow resin penetration into enamel. In contrast, long resin tags were found following acid pretreatment.
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