Cyclic fatigue testing of nickel-titanium endodontic instruments

Pruett, John P.; Clement, David J.; Carnes, David L.

doi:10.1016/s0099-2399(97)80250-6

Cited by 845 publications

(1,138 citation statements)

References 12 publications

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“…Criteria for root selection in this study were the curvature angle, measured by orthoradial radiography using Schneider's method, and the parameters described by Pruett et al (16). According to Pruett et al (16), two The results of the present study suggest that removal of debris from the apical third does not depend on the root curvature or the final instrument diameter used in the biomechanical preparation, although Fornari et al (7) claimed that instruments with greater diameters allow a better contact with canal walls and, thus, more effective cleaning.…”

Section: Discussionmentioning

confidence: 99%

Influence of apical enlargement in cleaning and extrusion in canals with mild and moderate curvatures

et al. 2011

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Optical microscopy and morphometric analysis were used in this study to evaluate, in vitro, the cleaning of the apical region in root canals with mild or moderate curvatures subjected to biomechanical preparation with a rotary system, as well as to assess the amount of extruded material to the periapical area. Lateral incisors (n = 32), 16 with curvature angles smaller or equal to 10° (GI) and 16 between 11° and 25° angles (GII) were submitted to Hero 642 rotary instrumentation with different surgical diameters: (A) 30.02 and (B) 45.02. Irrigation was performed at each change of instrument with 5 mL of ultrapure Milli-Q water and the extruded material through the apical foramen was collected. Root cross-sections were subjected to histological analysis by optical microscopy (×40) and the images were evaluated morphometrically using the Image Tool software. Quantification of the extruded material was performed by weighing after liquid evaporation. ANOVA showed no statistically significant differences (p>0.05) among the groups with respect to the procedures used to clean the apical region. Considering the amount of extruded material, the Tukey's HSD showed that canals with mild curvature prepared with the 45.02 surgical diameter showed significantly higher values (p<0.05) that those of the other groups, which were similar between themselves (p>0.05). In conclusion, the effect of cleaning the apical region did not differ in the groups, considering root curvature and the surgical diameter of instruments used for apical preparation. The amount of extruded material was greater in canals with mild curvature that were prepared with the 45.02 surgical instrument diameter.

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Section: Discussionmentioning

confidence: 99%

Influence of apical enlargement in cleaning and extrusion in canals with mild and moderate curvatures

et al. 2011

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“…Forty extracted human maxillary first molars were selected on the basis of having similar degrees of mesiobuccal canal curvature (20°-40°) and radii (5-10 mm), measured according to Schneider 14 and Pruett et al 15 Crowns were sectioned at the enamel-dentine junction in order to standardize root canal length (17 mm). Teeth were accessed by using an Endo-Access bur (Dentsply, Maillefer, Ballaigues, Switzerland) under air/water irrigation, and the root canal irrigated with 2.5% NaCL.…”

Section: Specimen and Root Canal Preparationmentioning

confidence: 99%

Computed tomography evaluation of rotary systems on the root canal transportation and centering ability

et al. 2015

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The endodontic preparation of curved and narrow root canals is challenging, with a tendency for the prepared canal to deviate away from its natural axis. The aim of this study was to evaluate, by cone-beam computed tomography, the transportation and centering ability of curved mesiobuccal canals in maxillary molars after biomechanical preparation with different nickel-titanium (NiTi) rotary systems. Forty teeth with angles of curvature ranging from 20° to 40° and radii between 5.0 mm and 10.0 mm were selected and assigned into four groups (n = 10), according to the biomechanical preparative system used: Hero 642 (HR), Liberator (LB), ProTaper (PT), and Twisted File (TF). The specimens were inserted into an acrylic device and scanned with computed tomography prior to, and following, instrumentation at 3, 6 and 9 mm from the root apex. The canal degree of transportation and centering ability were calculated and analyzed using one-way ANOVA and Tukey's tests (α = 0.05). The results demonstrated no significant difference (p > 0.05) in shaping ability among the rotary systems. The mean canal transportation was: -0.049 ± 0.083 mm (HR); -0.004 ± 0.044 mm (LB); -0.003 ± 0.064 mm (PT); -0.021 ± 0.064 mm (TF). The mean canal centering ability was: -0.093 ± 0.147 mm (HR); -0.001 ± 0.100 mm (LB); -0.002 ± 0.134 mm (PT); -0.033 ± 0.133 mm (TF). Also, there was no significant difference among the root segments (p > 0.05). It was concluded that the Hero 642, Liberator, ProTaper, and Twisted File rotary systems could be safely used in curved canal instrumentation, resulting in satisfactory preservation of the original canal shape.

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“…Thirty lower molars with intact pulp chambers, fully formed roots, two mesial canals with independent foramina, curvatures ranging from 25 to 35 degrees 15 and a radius below 10 mm 16 were selected from the human tooth bank at USP. Tooth size was standardized at 18 mm by sectioning occlusal surfaces with a diamond disc (Buehler, Lake Bluff, USA).…”

Section: Methodsmentioning

confidence: 99%

Assessing apical transportation in curved canals: comparison between cross-sections and micro-computed tomography

et al. 2012

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Assessing apical transportation in curved canals: comparison between cross-sections and micro-computed tomography Abstract: The aim of this study was to compare two methods of assessing apical transportation in curved canals after rotary instrumentation, namely, cross-sections and micro-computed tomography (µCT). Thirty mandibular molars were divided into two groups and prepared according to the requirements of each method. In G1 (cross-sections), teeth were embedded in resin blocks and sectioned at 2.0, 3.5, and 5.0 mm from the anatomic apex. Pre-and postoperative sections were photographed and analyzed. In G2 (µCT), teeth were embedded in a rubber-base impression material and scanned before and after instrumentation. Mesiobuccal canals were instrumented with the Twisted File (TF) system (SybronEndo, Orange, USA), and mesiolingual canals, with the EndoSequence (ES) system (Brasseler, Savannah, USA). Images were reconstructed, and sections corresponding to distances 2.0, 3.5, and 5.0 mm from the anatomic apex were selected for comparison. Data were analyzed using Mann-Whitney's test at a 5% significance level. The TF and ES instruments produced little deviation from the root canal center, with no statistical difference between them (P > 0.05). The canal transportation results were significantly lower (0.056 mm) in G2 than in G1 (0.089 mm) (p = 0.0012). The µCT method was superior to the cross-section method, especially in view of its ability to preserve specimens and provide results that are more closely related to clinical situations.

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Cyclic fatigue testing of nickel-titanium endodontic instruments

Cited by 845 publications

References 12 publications

Influence of apical enlargement in cleaning and extrusion in canals with mild and moderate curvatures

Influence of apical enlargement in cleaning and extrusion in canals with mild and moderate curvatures

Computed tomography evaluation of rotary systems on the root canal transportation and centering ability

Assessing apical transportation in curved canals: comparison between cross-sections and micro-computed tomography

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