Abstract
Regenerative techniques have been clinically available for over a decade, but with limited success in promoting new bone, cementum and connective tissue attachment. New understanding of the tissues involved in regeneration and of the materials used to promote regeneration have led to new advances. This is the first of two articles that discusses new regenerative technologies with respect to their rationale and potential for periodontal regeneration and focuses on root conditioning, bone grafts and bone substitutes, and guided tissue regeneration.