*2.1.1.2.2 Guided tissue regeneration*

The aim of regenerative therapy is the restoration of lost tissue in its form and function. GTR is a surgical procedure that uses barrier membranes to direct the growth of new bone and gingival tissue to sites with insufficient volume or dimension of bone and gingiva for proper function, esthetics and prosthetic rehabilitation [9]. GTR is used as an adjunct to orthodontics to re-establish new periodontal attachment and to improve the pre-orthodontic conditions for moving the teeth into infrabony defects or for guiding vertical movements of teeth with reduced bone support [10].
