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ORIGINAL ARTICLE
Year : 2016  |  Volume : 28  |  Issue : 2  |  Page : 119-126

Computed tomography evaluation of canal shaping and cleaning ability of three different instrumentation techniques; an in vitro study


Department of Conservative Dentistry and Endodontics, KVG Dental College and Hospital, Sullia, Karnataka, India

Correspondence Address:
L Krishna Prasada
Department of Conservative Dentistry and Endodontics, KVG Dental College and Hospital, Kurunjibagh, Sullia, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-7212.195421

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Introduction: The purpose of the study was to assess the root canal shaping and cleaning ability of three different instrumentation techniques namely step back, crown down and hybrid, using spiral CT. Materials and Methods: 90 extracted human mandibular first molar teeth was collected from the department of Oral and maxillofacial surgery, K.V.G Dental college and Hospital, Sullia, were selected for the study. Standard access cavities were made, and the teeth were sectioned into mesial and distal halves. The mesial half of the mandibular first molars were selected for the study. All the teeth were divided into groups of 15 each and instrumented using crown down, hybrid and step down techniques. They were divided into two sub groups and evaluated using spiral CT. Canal transportation and centering ability of the root canal using spiral CT was checked when instrumented using three canal preparation techniques. Kruskal Wallis and Friedman test were used to analyse the result. Result: Significant canal transportation occurred with hand instruments in the apical third. Hybrid technique was found to be superior in maintaining the original root canal anatomy and less amount of debris was seen in the apical third of the group instrumented using hand instruments. Conclusion: HYFLEX instruments produced cleaner and smoother and more even surface than the hand instruments. Iatrogenic errors are comparatively less in the group instrumented using hyflex rotary files. CT imaging techniques have been evaluated as noninvasive methods for the analysis of canal geometry and efficiency of shaping techniques that Nickel Titanium instruments remove less total dentine and result in less transportation especially in root canals with severe curvatures.


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