Affiliation: | 1. Laser Dental Clinic, Kermanshah, Iran 2. Department of Conservative Dentistry, Periodontology and Preventive Dentistry Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany 3. Department of Conservative Dentistry, Periodontology and Preventive Dentistry Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
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