2. Materials and Methods
This study was approved by the Ethics Committee of Tabriz University of Medical Sciences (approval no. IRCT20100125003168N7, 12 March 2019) and is compatible with the Helsinki Declaration of Human Rights. The study was carried out in Pediatric Dentistry Department, Dental Faculty, Tabriz University of Medical Sciences, starting on 23 March 2019 and continuing until 21 March 2020.