1. Department of Endodontics; Hacettepe University; Ankara Turkey
2. Department of Pediatric Dentistry; Faculty of Dentistry; Hacettepe University; Ankara Turkey
3. Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC; Institute of Dentistry; University of Turku; Turku Finland
4. City of Turku Welfare Division; Oral Health Care; Turku Finland