Comparative Evaluation of Dentinal Defects after Root Canal Preparation using Various Nickel Titanium Files: An Invitro study

Kameswaran, D (2019) Comparative Evaluation of Dentinal Defects after Root Canal Preparation using Various Nickel Titanium Files: An Invitro study. Masters thesis, K.S.R. Institute of Dental Science and Research, Tiruchengode.


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AIM OF THE STUDY: To evaluate the incidence of dentinal defects after root canal preparation using various nickel titanium files. OBJECTIVES: To compare the dentinal defects after using Hyflex EDM, ProTaper Next and Waveone Gold Nickel titanium files. MATERIALS AND METHODS: Sixty mandibular first premolars were selected and stored in purified filtered water. The coronal portions were removed by using a diamond disc, leaving roots of approximately 16 mm in length. All roots were inspected with stereomicroscope under 12X magnification to detect any pre-existing craze lines or cracks. Teeth with such findings were excluded from the study. A polyvinyl siloxane impression material was used to coat the cemental surface of roots for simulating periodontal ligament space. Then, all the roots were embedded in acrylic blocks. Canal patency was established with a #10 K-File. Sixty teeth were divided into 4 experimental groups (n=15) according to the instrument system that used for preparation. The findings of the present study is summarized as follows: 1. There was no statistically significant difference seen in coronal third and apical third region among the three groups. 2. There was a significant difference seen in middle third region between Hyflex EDM and Protaper Next. Hyflex EDM showed least number of cracks. 3. Although there was no statistically significant difference between Hyflex EDM and Waveone Gold, Hyflex EDM showed least number of cracks when compared with Waveone Gold in the middle third region. RESULTS: Each specimen was checked for the presence of dentinal defects (microcracks). ‘‘NO DEFECT’’ was defined as root dentin devoid of any craze lines or microcracks either at the external surface of the root or at the internal surface of the root canal wall. ‘‘DEFECT’’ was defined if any lines, microcracks, or fractures were present in root dentin. A total of 45 sections were examined in each group. Results were expressed as the number and percentage of defected roots in each group. A Chi Square test was performed to compare the appearance of defected roots between the experimental groups by using the SPSS/PC version 15 (SPSS Inc, Chicago, IL).The level of significance was set at p value < 0.05. CONCLUSION: Within the limitations of the present study, Hyflex EDM files manufactured using Electric Discharge Machining (EDM) process showed considerably good results compared to Protaper Next and Waveone Gold. Prudent selection of file system for instrumentation is of utmost importance for long term endodontic success.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Dentinal Defects ; Root Canal Preparation ; Nickel Titanium Files ; Invitro study.
Subjects: DENTAL > Conservative Dentistry and Endodontics
Depositing User: Subramani R
Date Deposited: 12 Aug 2019 15:22
Last Modified: 15 Aug 2019 14:20

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