Abstract
The scanning electron microscope was used to evaluate the dentin surface of diseased teeth subjected to two methods of conditioning with tetracycline hydrochloride (TTC) for 1 and 4 minutes respectively. Five groups of twelve specimens each received root planing (control); were immersed in TTC for 1 and 4 minutes; and burnished in TTC for 1 and 4 minutes. Control specimens exhibited an amorphous irregular surface smear layer. TTC, irrespective of the method used, was effective in removing the smear layer. Immersion in TTC for 1 minute revealed obstructed dentinal tubules, while burnishing for 1 minute revealed the presence of collagen fibrils. The 4-minute application of TTC, irrespective of the conditioning method used, showed wide exposed dentinal tubules. No significant difference between Groups III, IV, and V was noted (p>0.05).
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