E-ISSN 2548-0839
European Endodontic Journal Incidence of Protaper Universal System Instrument Fractures - A Retrospective Clinical Study []
. Ahead of Print: EEJ-30592 | DOI: 10.14744/eej.2018.30592

Incidence of Protaper Universal System Instrument Fractures - A Retrospective Clinical Study

Ricardo Machado1, Claudemir De Souza Júnior2, Matheus Felipe Colombelli2, Ana Paula Picolli3, Jaci Simi Junior4, Leopoldo Cosme- Silva5, Lucas Da Fonseca Roberti Garcia6, Luiz Rômulo Alberton7
1Clinical Practice Limited to Endodontics, Navegantes, Santa Catarina, Brazil
2Paranaense University – UNIPAR Campus Francisco Beltrão, Francisco Beltrão, Paraná, Brazil
3Integrated College from North of Minas Gerais-FUNORTE/SOEBRÁS, Florianópolis Nucleus, Florianópolis, Santa Catarina, Brazil
4Integrated College from North of Minas Gerais-FUNORTE/SOEBRÁS, Florianópolis Nucleus, Florianópolis, Santa Catarina, Brazil;
5School of Dentistry, São Paulo State University (UNESP), Endodontics, Araçatuba, Brazil
6Department of Dentistry, Endodontics, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
7Department of Veterinary Medicine and Graduate Program in Animal Science, Paranaense University – UNIPAR Campus Umuarama, Umuarama, Paraná, Brazil

Objective: The aim of this retrospective clinical study was to evaluate the incidence of ProTaper Universal System instrument fractures, associated with observation of the arch, group of teeth, and root thirds in which these fractures occurred.
Methods: From analysis of charts, clinical record cards and radiographs of endodontic treatments performed by postgraduate students using the Protaper system at a reference center, a total of 1031 teeth and 2355 canals were analyzed. The general incidence of instrument fractures and their frequency, considering the group of teeth, arch and root thirds, were cataloged and the data obtained were statistically analyzed (Exact Fischer test, with level of significance of 1%).
Results: The general percentage of fractures, considering the number of teeth and number of root canals evaluated was 4.4% and 1.9%, respectively. Instrument fractures occurred more frequently in the mandibular first (8.8%) and second (9.6%) molars, however, without statistically significant difference between the two types (p=0.81). In the first and second maxillary molars, the incidence of fracture was 4.7% and 5.1%, respectively, also without significant difference (p=0.81). Considering the dental arches (maxillary and mandibular), the fractures occurred with significantly higher frequency in the mandibular arch (66.7%), in comparison with the maxillary arch (33.3%) (p<0.01). A significantly higher percentage of fractures occurred in the apical third (84.4%) compared with the middle third (15.6%) (p<0.01).
Conclusion: The general percentage of fractures, considering the number of teeth and number of root canals evaluated was 4.4% and 1.9%, respectively. However, the arch (mandibular) and root third (apical) had a significant effect on the incidence of instrument fractures.

Keywords: Fracture, endodontic files, nickel-titanium instruments, ProTaper universal



Corresponding Author: Ricardo Machado, Brazil

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