[A clinical x-ray evaluation of the efficacy of hydroxyapatite with collagen in treating periodontitis and radicular cysts].

One-year follow-up of 20 patients with radicular cysts and 16 ones with medium-severity chronic periodontitis demonstrated the efficacy of hydroxylapatite with collagen. Active formation of osseous tissue at the site of cysts, in the periodontal osseous pockets, and at the apexes of interdental septa was observed 6 to 7 months after the treatment.