Guided Tissue Regeneration (GTR)
These are the procedures that attempt to regenerate lost periodontal structures that support our teeth. This is accomplished using biocompatible membranes, often in combination with bone grafts and/or tissue stimulating proteins.

Guided Bone Regeneration (GBR)
This refers to procedures that attempt to regenerate bone prior to the placement of bridges or, more commonly, implants. This is accomplished using bone grafts and biocompatible membranes that keep out tissue and allow the bone to grow.

We have great techniques available to us to replace missing bone. We can increase bothe the width and height of bone. We can fill in anatomical voids in bone thereby creating new bone and we can fill in all sorts of defects that develop when teeth are lost. We can even use grafting techniques to prevent the loss of bone in circumstances where bone would normally be lost like the extraction of a tooth.