الفهرس 
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Abstract
A total of fourty scaling procedures in twenty patients were completed, ten patients with chronic gingivitis and ten with advanced periodontitis.
Each patient received supra and sub—gingival hand scaling during one appointment and ultra—sonic scaling procedure during another appointment.
A blood sample (18 ml.) was taken prior to any type of scaling as a control to insure aganist existing bacteremia, and another sample was taken exactly five minutes after each type of scaling.
The blood samples were cultured aerobically in air containing 5 carbon dioxide and anaerobically.
All fourty control blood cultures were proved to be sterile.
In twenty Datients, twenty—three cases of bacteremies were found, : ese were 57.5% of the fourty scaling procedures. Nine out of twenty or 45% resulted from the hand scaling and fourteen out of twenty or 70% resulted from ultra—sonic scaling.
Transient systemic bacteremia occured in 70% of patients with ranced peziodontitis, and in 45% of patients with chronic gingivitis.
Of fourty strains of microorganisms recovered, thirteen were ptococcus viridans, ten were Diphtheroids and nine were stapkvlo— cus albus.