1. Department of Prosthetic Dentistry and Stomatognathic Physiology; Institute of Dentistry, University of Turku; FI-20520 Turku Finland
2. Turku Clinical Biomaterials Center (TCBC), University of Turku; 20520 Turku Finland
3. Clinic of Oral Diseases; Turku University Central Hospital; FI-20520 Turku Finland
4. Department of Biomaterials Science; Institute of Dentistry, University of Turku; FI-20520 Turku Finland
5. Department of General Practice; School of Dentistry, Virginia Commonwealth University; Richmond Virginia