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RESEARCH PRODUCT
Shaping ability of nickel-titanium rotary instruments in simulated S-shaped root canals.
Márcia CostaMari Carmen LlenaRui MadureiraLeopoldo Forner Navarrosubject
Dental Stress AnalysisDental InstrumentsFlexibility (anatomy)Hand techniqueRoot (chord)Normal DistributionDentistryCurvatureNickelmedicineHumansTooth RootPliabilityGeneral DentistryParametric statisticsMathematicsTitaniumAnalysis of Variancebusiness.industryStructural engineeringStainless SteelModels Dentalmedicine.anatomical_structureOtorhinolaryngologyNickel titaniumSurgeryEquipment FailureOral SurgeryDental Pulp CavitybusinessRoot Canal PreparationDental Alloysdescription
Objective The aim of this study was to compare the shaping ability of 4 nickel-titanium rotary techniques and 1 hand technique in simulated S-shaped curved root canals. Study design Seventy-five simulated double-curved resin root canals were divided into 5 groups (n = 15). The canals were compared at 12 different levels and at 3 different times: before preparation and after preparation to master apical 25 and 35. Data were statistically analyzed by performing 2-by-2 comparisons with the Tukey parametric test of variance analysis using a confidence interval of 95%. Results All of the 75 resin blocks presented transportation of the root canals by transforming the apical curvature into a straight zone and straightening the first curvature. When increasing the diameter from 25 to 35, both curvatures were straightened. Conclusions Based on the conditions of this study, we can say that the flexibility of the instruments is inversely related with the transportation of the root canals, and that in the double-curved root canals, the apical curvature is always straightened.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-05-27 | Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics |