DOI: http://dx.doi.org/10.18363/ rbo.v74n3.p.191 191 Rev Bras Odontol. 2017;74(3):191-7 Original Article/Endodontics Identification of the profile and perceptions of Brazilian dentists regarding the use of rotary and/or reciprocating instruments in endodontic treatment Renata Pereira Georjutti, 1 Fernanda Ladico Miura, 2 Rodrigo Antônio de Faria, 3 Alexandre Sigrist de Martin, 1 Carlos Eduardo da Silveira Bueno 1 1 Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, SP, Brazil 2 Multiprofessional Resident in Oncology Care, Dentistry Course, Uberlândia Federal University, Uberlândia, MG, Brazil 3 Department of Endodontics, Dentistry Course, Triangle Center University, Uberlândia, MG, Brazil • Conflicts of interest: none declared. AbstrAct Objective: the aim of this study was to establish the profile of dentists with respect to some characteristics in the use of systems and kinematics of instrumentation most used in Brazil for endodontic treatment. Material and Methods: an invitation to participate in the survey was sent digitally to 1,300 dentists from Janu- ary-April 2016, distributed in the five regions of Brazil, using a service available at surveymonkey.com (Survey Monkey, Palo Alto, CA, USA). They were validated 1,143 with the option of free and informed consent. The data collected were divided into two groups, the first group being only general practioners group (CG Group) and the second group, dentists that did postgraduation in Endodontics (PE Group). Data were statistically analyzed using the Mann-Whitney and Likelihood Ratio (p <0.05). Results: most dentists of the two groups reside in the Southeast region; Are of the female gender; Average age between 26 and 34 years and have a postgraduate degree. The most striking feature of the use of the reciprocating system was the reduction in working time. Conclusion: within the limitations of the present re- search, it was concluded that most dentists presented a similar profile regardless of whether or not they had a postgraduate course, since they do not use rotating or reciprocating systems exclusively, being Protaper Universal® and Reciproc® the most used, associate the systems with manual files and reuse the files of the systems. Keywords: Dentistry; Endodontics; Surveys and questionnaires; Root canal therapy. Introduction S everal systems of nickel-titanium (Ni-Ti) instruments have been introduced in endodontics since the 1990s, with the goal of minimizing difculties faced by clini- cians during endodontic treatment. 1 Tere are some types of automated instrumentation, among which we can mention the instrumentation with continuous rotational movement and the instrumentation with alternating rotational move- ment, which can be symmetrical / oscillatory or asymmetric / reciprocating. 2-3 Brazil is currently the country with the greatest number of dentists (19%), and endodontics is the specialty with the second greatest number of professionals registered at the Brazilian Federal Dentistry Board, totaling 13.641 special- ists up to 2015. 4 Data on the profle of Brazilian dentists re- garding the use of Ni-Ti rotary and reciprocating systems are scant and incomplete. Studies on this subject could help address important is- sues raised by scientifc publications and continuing edu- cation courses, and also provide insight for the assessment of problems faced by clinicians in their daily endodontic practice. 5 Overall, there are few studies on how endodon- tists-specialists or otherwise-regard new concepts, new techniques and new endodontic instruments, and on how these advances have infuenced their daily clinical practice and quality of life. Te objective of this work was to identify the profle of dentists in relation to the use of the most used instrumenta- tion and kinematics systems in Brazil for endodontic treat- ment through a questionnaire. Material and Methods Ample Size Te sample size was calculated using the method of Cohran. 6 Based on a Type I error of 0.05 and a power of 80%, a minimum total sample of 384 individuals was considered necessary to detect diferences between the two groups studied according to statistical tests. Experimental Design Te two groups were composed of dentists that per- formed endodontic treatment in their day-to-day clini- cal, having in the frst group only general practioners (CG Group) and in the second group, dentists that did postgrad- uate studies in Endodontics (Group PE), specialization, master or doctorate. Te questionnaires were distributed in all demographic regions of Brazil. Te study included only dentists residing in Brazil, enrolled in the Federal Council of Dentistry (CFO), which use automated instruments ( fles) that perform rotational or reciprocating movements during endodontic treatment. Questionnaires answered by dentists that were not enrolled in the CFO at the time of the survey or returned incompletely flled out were excluded. Data Collection Tis research was approved by the Research Ethics Committee of the São Leopoldo Mandic Dental Research Center (Opinion nº. 1.431.608), Campinas, SP. An invita- tion with a link to the questionnaire was sent digitally via email, WhatsApp or social media to 1,300 dentists, distrib- uted in the 5 regions of Brazil, using the service available at