Fracture incidence of instruments from a single‐file reciprocating system by students in an endodontic graduate programme: a cross‐sectional retrospective study

Caballero-Flores, Hector; Nabeshima, Cleber Keiti; Binotto, E.; Machado, Manoel Eduardo de Lima

doi:10.1111/iej.12982

Cited by 40 publications

(38 citation statements)

References 32 publications

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“…Regarding overall fatigue resistance, two systematic reviews found that instruments used in reciprocation have better CF resistance than rotary instruments (). A clinical study from an endodontic graduate programme found less than 1% instrument fracture using WaveOne reciprocating instruments (). When new instruments like EdgeFile X1 are introduced, it is important to study multiple properties including cutting efficiency, torsional resistance, CF resistance and flexibility, especially when they are manufactured with new alloys and there is a lack of information about their performance.…”

Section: Introductionmentioning

confidence: 99%

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

et al. 2019

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The purpose of this study was to compare cyclic fatigue (CF) resistance of reciprocating instruments at body temperature and relate the findings to their martensitic transformation temperatures. Contemporary nickel-titanium (NiTi) reciprocating instruments WaveOne Primary, WaveOne Gold Primary and EdgeFile X1 (n = 20 each and #25 tip diameter) were tested for CF resistance at body temperature (37 AE 1°C). Instruments were actioned according to manufacturer guidelines until fracture occurred in a simulated canal (angle of curvature = 60°, radius of curvature = 3 mm and centre of curvature = 5 mm from the tip). Time to fracture was recorded, and data analysed using Weibull analysis. Two instruments of each were tested using differential scanning calorimetry (DSC) to assess phase transformation temperatures. Reciprocating instruments manufactured with new alloys seem to be safer to CF than those manufactured with traditional M-Wire at body temperature. Martensitic transformation temperatures seem not to relate with fatigue behaviour for reciprocating motions.

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Section: Introductionmentioning

confidence: 99%

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

et al. 2019

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“…The total incidence of file fractures in the present study was 3.9 patients/100 root canal-treated patients, which was higher when compared to that of earlier literature. [ 9 10 11 12 ] Multiple factors need to be addressed before comparing the present study results with those of the past literature. Variations in the study methodology, operator expertise, and instrumentation file systems of earlier studies, limit the comparison of the present study results with those of the past literature.…”

Section: Discussionmentioning

confidence: 98%

The incidence of nickel-titanium endodontic hand file fractures: A 7-year retrospective study in a tertiary care hospital

2020

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Aim: The present retrospective cross-sectional study aims to evaluate the incidence and factors associated with nickel-titanium hand file fractures in root canal-treated teeth in a tertiary care hospital of western India. Methodology: The diagnostic records of intraoral periapical (IOPA) radiographs were analyzed to check for file fractures in the root canal-treated teeth. As a part of standardized departmental protocol, Hand ProTaper Universal file system (Dentsply, India) was used for chemomechanical preparation for root canal treatment. The file fractures were analyzed with reference to age group, type of teeth, curvature of the canal, site of file fracture in the canal, length of file fracture, level of file fracture, distance of the file fracture from the apex, and obturation status of the file-fractured tooth. Chi-square test was applied to assess the significance difference between the tested groups. Results: A total of 19,810 IOPA X-rays were screened and 2728 root canal-treated teeth were found and of these 2728 cases, 109 file-fractured teeth were observed. Conclusion: The total incidence of file fractures was 3.9/100 root canal-treated cases, and mandibular molars with severely curved canals (>25°) had shown the maximum incidence of file fractures.

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“…Although other authors have used stereomicroscopy [11,12], the use of scanning electron microscopy is justified because some fracture-related changes are seen at high magnifications only, which is not possible with an operation microscope [14]. The 4-mm region from the tip of the instrument was chosen for evaluation because it is where the fracture usually occurs [11,12,24], and mandibular molars were used because the incidence of instrument fracture is high in these teeth [11,17,24,25].…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, this topic should be considered in function of the number of reuses of the instruments in the clinical practice. Caballero-Flores and coauthors [25] observed that the WaveOne files can be clinically reused up to six root canals, with low incidence of fracture (0.92%). This finding is in accordance with our results because the disruption of cutting edges was the only statistically significant defect, increasing from the sixth use onwards.…”

Section: Discussionmentioning

confidence: 99%

Assessment of the Performance and Surface Alteration of Two Single-file Systems According to the Number of Uses

Porto-Pires

Nabeshima

Caballero-Flores

et al. 2020

Braz. arch. biol. technol.

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The aim of this study was to assess the performance and surface alteration of two single-file systems according to the number of uses. Ten WaveOne Primary files (25/.08) and ten One Shape NG files (25/.06) were used for instrumentation of mesial root canals of mandibular molars. Each instrument was cleaned and sterilized after the preparation of two root canals and then reused. The time spent for instrumentation of each root canal was recorded and analyzed by using t-test. Microphotographs of the surface of the instruments were taken with a scanning electron microscope at different magnifications (i.e. 18x, 160x, 500x and 1000x) and at a distance of 4 mm from the instrument's tip before being analyzed by four observers. Presence of disruption of cutting edge, crack, craters and unwinding was assessed and submitted to Fisher's exact test. Both systems showed manufacturing defects and cracks. The presence of disruption of cutting edges was major in WaveOne files from the sixth use, whereas One Shape NG files showed more unwinding. Only preparation time using WaveOne files was influenced by the number of uses. One can conclude that WaveOne files had more disruption of cutting edges and took longer time for root canal preparation from the sixth use onwards, whereas the One Shape NG files showed more unwinding at the tenth use.

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Fracture incidence of instruments from a single‐file reciprocating system by students in an endodontic graduate programme: a cross‐sectional retrospective study

Abstract: The use of WaveOne and Reciproc single-file reciprocating systems in an endodontic graduate programme was associated with a low incidence of instrument fractures.

Cited by 40 publications

References 32 publications

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

The incidence of nickel-titanium endodontic hand file fractures: A 7-year retrospective study in a tertiary care hospital

Assessment of the Performance and Surface Alteration of Two Single-file Systems According to the Number of Uses

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