1. Department of Periodontology, Faculty of Dentistry, Istanbul Aydin University, Istanbul, Turkey.
2. Department of Prosthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
3. Department of Periodontology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
4. Forsyth Institute, Department of Applied Oral Sciences, Center for Periodontology, Cambridge, Mass.