Bovine pericardium based non-cross linked collagen matrix for successful root coverage, a clinical study in human

62 gingival recessions of Miller class I or II were treated. The matrix was adapted underneath a coronal repositioned split thickness flap. Clinical values were assessed at baseline and after six months.The mean recession in each patient was 2.2 mm at baseline. 6 Months after surgery 86.7% of the exposed root surfaces were covered. On average 0,3 mm of recession remained. The clinical attachment level changed from 3.5 ± 1.3 mm to 1,8 ( ± 0,7) mm during the observational time period. No statistically significant difference was found in the difference of probing depth. An increase in the width of gingiva was significant. With a baseline value of 1.5 ± 0.9 mm an improvement of 2.4 ± 0.8 mm after six month could be observed. 40 out of 62 recessions were considered a thin biotype at baseline. After 6 months all 62 sites were assessed thick.The results demonstrate the capacity of the bovine pericardium based non-cross linked collagen matrix for successful root coverage. This material was able to enhance gingival thickness and the width of keratinized gingiva. The percentage of root coverage achieved thereby is comparable to existing techniques. This method might contribute to an increase of patient's comfort and an enhanced aesthetical outcome.According to the Glossary of Periodontal Terms (2001), gingival recessions are defined as "location of marginal periodontal tissues apical to the cemento-enamel junction " [1]. It is well known that the major causative factors in the development of marginal tissue recessions are a bucal/lingual malposition of the tooth, a thin gingival biotype, dehiscence and fenestration of the bucal alveolar bone and iatrogenic factors such as orthodontic treatment. A possible influence of occlusal trauma is still discussed. Localized gingival recessions and root exposure may cause an aesthetic problem for the patient and are often associated with dentine hypersensitivity [2]. Further, root caries and persisting gingival inflammation are frequentl