Zahra Jamali 
1, Ebrahim Najafpour 
2, Ziya Ebrahim Adhami 
3, Alireza Sighari Deljavan 
4, Naser Asl Aminabadi 
5, Sajjad Shirazi 
6,7*1 Assistant Professor, Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2 Associate Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
3 Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
4 Associate Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
5 Postgraduate Student, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran
6 Researcher and Lecturer, Dental and Periodontal Research Center, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
7 Research Center of Psychiatry and Behavioral Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
        
 
        
	
        
        
Abstract
            The aim of  this systematic review was to investigate the effect of treatment duration on  children’s behaviour and/or anxiety in the dental setting. For this purpose, a  systematic search was conducted in Pubmed/medline and Scopus from 1970 to march  2017 for English language articles that assessed the relationship between  dental treatment duration or length, and fear/anxiety or behaviour in children  aged <12 years old with no confounding medical and/or psychological history  and neuro-psychiatric disabilities. Four studies investigating the effect of  treatment duration on children’s behaviour during and/or after treatment were  included. None of the reviewed studies investigated the effect of treatment  duration on children’s dental anxiety or fear. There was a general tendency towards deterioration of children’s behaviour  with the increase of treatment duration. In conclusion, our results undermine the validity of current  suggestions about the appropriate treatment duration. Further clinical trials  are needed to establish appropriate treatment  duration for more effective behavioural management of paediatric patients  during dental procedures.