This study by Wohlfahrt JC, Aass AM, Rønold HJ, Heijl L, Haugen HJ, Lyngstadaas SP has been e-published in JOP (Journal of Periodontology).
The results of the study in mini pigs suggest that PTG may integrate well in alveolar bone and supports osseous regrowth in degree II furcation defects. Moreover, PTG seems safe to use in close proximity to root surfaces.