Affiliation: | 1. Iranian General Dentists Association, , Tehran, Iran;2. Department of Periodontics, Dental School, Shahid Beheshti University of Medical Sciences, , Tehran, Iran;3. Dental School, Shahid Beheshti University of Medical Sciences, , Tehran, Iran;4. Department of Dental Biomaterial, Dental School, Shahid Beheshti University of Medical Sciences, , Tehran, Iran;5. Iranian Academy of Periodontology, , Tehran, Iran |