الفهرس 
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Abstract
The main objective of periodontal treatment is to resolve the inflammatory
lesion in periodontal tissues. However, the contemporary goal has become
regeneration of the lost attachment apparatus through guided tissue
regeneration (GTR) technique. In the GTR procedures, various kinds of
membranes play important roles. Chitosan, a deacetylated derivative of chitin,
is biocompatible, biodegradable, and antimicrobial. It acts as hydrating agent
and possesses tissue healing and
osteoinducing effect. Chitosan can be easily processed into membranes, gels,
nanofibers, beads, nanoparticles, scaffolds. The composite of chitosan
including hydroxyapatite is very popular because of the biodegradability and
biocompatibility in nature.