There are various barrier membranes for guided tissue regeneration including bioabsorbable and non-absorbable membranes. Dental practitioners should be familiar with the properties, clinical applications and therapeutic effects of these membranes so that they could provide proper therapy for the patients. The purpose of this paper is to provide the information concerning the biological and physical properties, clinical applications and therapeutic effects of one of the bioabsorbable membranes, collagen membranes.