الفهرس 
Etiology of periodontitisOnly 14 pages are availabe for public view
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Abstract
The current study was carried out to evaluate the efficacy of hydroxyapatite collagen gel implant and bioddegredable collagen membrane in the treatment of periodontal angular bone defects clinically and radiographically as compared to control defects treated by surgical debridement only eighty periodontal osseous defects in fourty patients aged from 40-53 years with adult periodontitis were selected in the present study.