Rompen, E., Raepsaet, N., Domken, O., Touati, B., & Van Dooren, E. (2007). Soft tissue stability at the facial aspect of gingivally converging abutments in the esthetic zone: A pilot clinical study.
Journal of Prosthetic Dentistry, 97 (6, Suppl. S), 119-S125. doi:10.1016/S0022-3913(07)60015-8
https://hdl.handle.net/2268/258900