Fracture incidence of Reciproc instruments during root canal retreatment performed by postgraduate students: a cross-sectional retrospective clinical study
Ruivo Liliana Machado, De Azevedo Rios Marcos, Villela Alexandre Mascarenhas, de Martin Alexandre Sigrist, Kato Augusto Shoji, Pelegrine Rina Andrea, Barbosa Ana Flavia Almeida, Silva Emmanuel Joao Nogueira Leal, Da Silveira Bueno Carlos Eduardo,
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( Ruivo Liliana Machado ) - Sao Leopoldo Mandic Dental Research Center Department of Endodontics
( De Azevedo Rios Marcos ) - Universidade Estadual de Feira de Santana Department of Endodontics
( Villela Alexandre Mascarenhas ) - Centro Baiano de Estudos Odontologicos Department of Endodontics
( de Martin Alexandre Sigrist ) - Sao Leopoldo Mandic Dental Research Center Department of Endodontics
( Kato Augusto Shoji ) - University of Sao Paulo Bauru Dental School Department of Restorative Dentistry, Dental Materials and Endodontics
( Pelegrine Rina Andrea ) - Sao Leopoldo Mandic Dental Research Center Department of Endodontics
( Barbosa Ana Flavia Almeida ) - Rio de Janeiro State University Department of Endodontics
( Silva Emmanuel Joao Nogueira Leal ) - Rio de Janeiro State University Department of Endodontics
( Da Silveira Bueno Carlos Eduardo ) - Sao Leopoldo Mandic Dental Research Center Department of Endodontics
Abstract
Objectives: To evaluate the fracture incidence of Reciproc R25 instruments (VDW) used during non-surgical root canal retreatments performed by students in a postgraduate endodontic program.
Materials and Methods: From the analysis of clinical record cards and periapical radiographs of root canal retreatments performed by postgraduate students using the Reciproc R25, a total of 1,016 teeth (2,544 root canals) were selected. The instruments were discarded after a single use. The general incidence of instrument fractures and its frequency was analyzed considering the group of teeth and the root thirds where the fractures occurred. Statistical analysis was performed using the χ2 test (p < 0.01).
Results: Seven instruments were separated during the procedures. The percentage of fracture in relation to the number of instrumented canals was 0.27% and 0.68% in relation to the number of instrumented teeth. Four fractures occurred in maxillary molars, 1 in a mandibular molar, 1 in a mandibular premolar and 1 in a maxillary incisor. A greater number of fractures was observed in molars when compared with the number of fractures observed in the other dental groups (p < 0.01). Considering all of the instrument fractures, 71.43% were located in the apical third and 28.57% in the middle third (p < 0.01). One instrument fragment was removed, one bypassed, while in 5 cases, the instrument fragment remained inside the root canal.
Conclusions: The use of Reciproc R25 instruments in root canal retreatments carried out by postgraduate students was associated with a low incidence of fractures.
키워드
Fracture; Nickel-titanium files; Reciprocating motion; Retreatment
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