الفهرس 
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Abstract
9-Summary Periodontitis, a relevant cause of tooth loss in adults it is a chronic inflammatory disease that is characterized by localized bone resorption
the pathogenesis of periodontitis involves the presence of a bacterial
plaque that may initiate a local inflammatory reaction in predisposed
hosts.
There is a pressing demand to discover novel strategies. There is
an evidence that scaling and root planning with hand instruments or
ultrasonic therapy is effective in treating periodontitis but it doesn’t
remove bacterial toxins or bacterial deposits completely. So, a lot of
researchers have proposed using of several types of laser as a more
efficient method of root planning. The present study was designed to determine the antimicrobial
effect after using diode laser (980 nm) as adjunctive therapy to scaling
.and root planning in the treatment of induced periodontitis in rats
One hundred and twenty male albino rats were used. Rats were
induced to have periodontitis
group I (infection group): 20 rats.
group II (positive control group): 50 rats got SRP alone (positive
control group).
group III (test group): 50 rats got SRP and subjected to Irradiation
with 1watt Diode Laser (980 nm) using optical fiber, positioned parallel
to the long axis of the tooth in the induced periodontal pocket.
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Microbiological analysis and histological assessment were done
prior to the start of the treatment at baseline, day 7 and 14.
The results showed that SRP assisted by diode laser therapies
exhibits better results than SRP alone, all sites treated with SRP and
diode laser showed more statistically significant improvement in all
clinical parameters ,all sites treated with SRP and diode laser showed
reducing total bacterial count than SRP alone ,microbial counting
reducing colony forming units, as well as histopathological findings
regarding significant reduction in the inflammatory cell count and bone
showing significant regenerations.
.
Results of the present study revealed that treatment with diode
laser as adjunctive to SRP may improve periodontal, microbiological
indices and histological findings compared to SRP alon