Restor Dent Endod.  2021 Nov;46(4):e49. 10.5395/rde.2021.46.e49.

Fracture incidence of Reciproc instruments during root canal retreatment performed by postgraduate students: a crosssectional retrospective clinical study

• Ruivo LM
• Rios MdA
• Villela AM
• Martin ASd
• Kato AS
• Pelegrine RA
• Barbosa AFA
• Silva EJNL
• Bueno CEdS

• KMID: 2548093
• DOI: http://doi.org/10.5395/rde.2021.46.e49

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.

Keyword

Fracture; Nickel-titanium files; Reciprocating motion; Retreatment

Figure

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  Figure 1 Radiograph images of the 7 Reciproc R25 instruments fractured during root canal retreatments in each tooth and respective root canal. A maxillary central incisor with a fragment of fractured instrument in its middle third (A); a mandibular second premolar with a fragment of fractured instrument in the apical third of its vestibular root canal (B); a maxillary second molar with a fragment of fractured instrument in the apical third of its palatal root canal (C); a maxillary first molar with a fragment of fractured instrument in the apical third of its mesiobuccal root canal (D); a maxillary first molar with a fragment of fractured instrument in the apical third of its palatal root canal (E); a maxillary second molar with a fragment of fractured instrument in the apical third of its distobuccal root canal (F); a mandibular first molar with a fragment of fractured instrument in the middle third of its mesiobuccal root canal (G).

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