Sumathi, K (2017) A Comparative Evaluation of Efficacy of Phytic Acid, Etidronic Acid and EDTA on Smear Layer Removal and Dentin Erosion at Different Time Intervals Using Scanning Electron Microscope: An In Vitro study. Masters thesis, Tamil Nadu Government Dental College and Hospital, Chennai.
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Abstract
AIM : The purpose of this in vitro study was to compare the smear layer removal efficacy and dentin erosion of three different irrigating solutions at different time intervals of the root canal under Scanning Electron Microscopy. MATERIALS AND METHODS : One hundred extracted human single straight rooted maxillary central incisors were taken and decoronated to standardize the canal length of 16 mm. They were instrumented by ProTaper NEXT rotary system to an apical preparation of file size X5. Prepared teeth were irrigated with 3ml of 3% NaOCl for 5min followed by final rinse of 2ml of 1% phytic acid (Group I), 18% Etidronic acid (Group II) and 17% EDTA (Group III) at 5min, 3min and 1min. The canals of teeth in Control (Group IV) did not receive the final irrigation. The teeth were sectioned longitudinally and prepared for an SEM evaluation. The dentinal wall of cervical, middle and apical thirds was graded according to the amount of smear layer remaining and dentin erosion on the root canal walls. The results were analysed using the Kruskal–Wallis and Mann Whitney U tests with significance set at P < 0.05. RESULTS : Intergroup comparison showed statistically no significant difference (p=1.000) in the smear layer removal efficacy of irrigants tested at 5min, 3min and 1min except for Etidronic acid(Group II) at 1min (p=.000). Control (Group IV) showed statistically high significant difference (p=.000) than other groups. Apical region of all groups showed statistically high significant difference (p=.000) than cervical and middle region. Intergroup comparison of dentin erosion showed EDTA (Group III) had high erosion values (p=.000) than other groups which are statistically significant. Phytic acid (Group I) showed less erosion values (p=.000) than other groups which are highly significantr. CONCLUSION : Phytic acid shows effective smear layer removal with less erosion of the root canal wall. Increasing the duration of irrigation does not improve the smear layer efficacy of irrigants except for Etidronic acid (Group II) but all groups showed more erosion at increased irrigation time. All the groups did not completely remove the smear layer at the apical region.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Smear Layer, Dentin Erosion, Phytic Acid, Etidronic Acid, EDTA. |
| Subjects: | DENTAL > Conservative Dentistry and Endodontics |
| Depositing User: | Kambaraman B |
| Date Deposited: | 04 Jan 2018 03:57 |
| Last Modified: | 04 Jan 2018 03:57 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/5188 |
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