The effects of different stages of periodontal therapy on salivary pseudocholinesterase (PCE) activity in patients with periodontitis were determined by use of a spectrophotometric method. The mean PCE activity in whole saliva was 17.95 U/L in the pre-treatment phase, 4.67 U/L after scaling and oral hygiene instructions, and 1.93 U/L following surgical procedures. It was observed that the mean salivary PCE activity in patients with periodontitis showed a tendency to decrease in both phases of treatment, and PCE levels at the end of periodontal therapy were similar to those of healthy subjects.
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