Comparing The Ability Of Two Herbal Irrigants On Smear Layer Removal Against 2.5% Sodium Hypochlorite And Chlorinedioxide- a SEM Analysis

Akshaya, V B (2020) Comparing The Ability Of Two Herbal Irrigants On Smear Layer Removal Against 2.5% Sodium Hypochlorite And Chlorinedioxide- a SEM Analysis. Masters thesis, Ragas Dental College and Hospital, Chennai.

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Abstract

AIM OF THE STUDY: The aim of this in vitro study was to evaluate and compare the efficacy of two herbal irrigants on smear layer removal against 2.5% sodium hypochlorite and 0.5% chlorinedioxide using scanning electron microscope. METHODOLOGY: Forty single-rooted human mandibular premolar teeth were selected and decoronated.. All roots were reduced to a length of about 15mm. Working lenth was established. Biomechanical preparation was done. Teeth were randomly divided into four groups of 10 specimen each according to the final irrigation solution. Group A- 2.5% sodium hypochlorite, Group B- 0.5% chlorinedioxide, Group C-Terminalia chebula, Group D- Liquorice. The samples in each group were irrigated with 5 ml of each irrigant. Each specimen was split longitudinally into two halves along the prepared groove on the buccal and lingual aspect. For each split half sample, smear layer removal was evaluated at three different levels namely coronal, middle and apical thirds by scoring the amount of smear layer retained and the opening of dentinal tubules under SEM. The values were tabulated and statistically analysed. RESULTS: In Group A and Group B, where 2.5% NaOCl and 0.5% chlorinedioxide respectively were used as an irrigants, the smear layer was removed and dentinal tubules were opened in the coronal third region of the root canal wall when seen under SEM. In middle region, half of the tubules were opened and half of them are covered with smear layer in both Group A and B. A moderate to thin smear layer was seen in samples treated with NaOCl (Group A), especially in the middle and coronal sections but in the apical section there was more smear layer (moderate to heavy). No smear layer was noted on the surface of the samples irrigated with chlorinedioxide (Group B) in coronal and middle section while mild smear layer was seen in the apical portion of rootcanal. But chlorinedioxide group shows more smear layer removal efficacy compared with sodium hypochlorite. Most of the dentinal tubules were completely covered by the smear layer which could be seen on root canal wall in apical third region of NaOCl group while chlorinedioxide showed better result for smear layer removal in apical region. In Group C (terminalia chebula) and in Group D (Liquorice) herbal irrigants were tested to check the smear layer removal efficacy. The samples irrigated with Terminalia chebula (Group C) had moderate to thin smear layer in coronal and middle sections but in apical section dentinal tubules were covered with smear layer. The results obtained in this Group C (Terminalia chebula) were somewhat similar to the results obtained in Group A (2.5% NaOCl). It was found that there was incomplete removal of smear layer in all the three aspects of root canal under SEM for group D. There was a significant difference among the data of groups (P < 0.005). CONCLUSION: No smear layer was noted on the coronal surface of the samples irrigated with Group B (chlorinedioxide). A mild smear layer was seen in middle and apical surface of samples irrigated with Group B. A moderate smear layer was seen in coronal and middle third surface of specimens treated with Group A (NaOCl) and Group C (Terminalia chebula). In the apical section, there was heavy smear layer in both Group A and C. Group D (Liquorice) had substantial smear layer in all the three sections of the rootcanal. Within the limitations of the study, it can be concluded that; among the irrigants tested, 0.5% chlorinedioxide showed maximum cleansing effect followed by 2.5% sodium hypochlorite and the herbal irrigant terminalia chebula. The herbal agent liquorice is ineffective as root canal irrigant.

Item Type: Thesis (Masters)
Additional Information: 241717151
Uncontrolled Keywords: Smear layer removal, Chlorinedioxide, Terminalia chebula, Liquorice, Scanning electron microscope.
Subjects: DENTAL > Conservative Dentistry and Endodontics
Depositing User: Subramani R
Date Deposited: 22 Feb 2021 16:55
Last Modified: 23 Feb 2021 03:18
URI: http://repository-tnmgrmu.ac.in/id/eprint/14406

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