[Guided tissue regeneration: clinical and microscopic study]

A case of furcation involvement of a maxillary molar is reported. The treatment consisted in applying the concept of Controlled Tissue Regeneration using a Goretex membrane. After removal of the membrane the result is satisfactory. The membrane is then examined under transmission electronic microscope. The lateral aspect of the membrane (in contact with the proliferating epithelial tissue) show a marked bacterial proliferation.