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This study is also split mouth design where half of the mouth is treated with scaling alone the other half with scaling followed by modified Widman flap surgery. No infection control methods were administered except local debridement followed by oral hygiene instructions and three month follow-up prophylaxis.

The results were as follows:

1) Treatment results following scaling versus scaling plus modified Widman flap surgery were maintained over a 6-1/2 year period.

2) Pocket depth did not change in shallow pockets (1-3mm deep) over 6-1/2 years for either treatment.

3) For pockets 4-6mm deep, both treatments resulted in equally effective and sustained pocket reduction.