Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion
Objectives: The purpose of the present study was to examine the effect on root canal wall dentin and compare the level of erosion caused by different irrigation sequences. Material and methods: Dentin specimens of the middle third of the root of extracted teeth with one root canal were instrumented...
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2011
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ndltd-UBC-oai-circle.library.ubc.ca-2429-369912018-01-05T17:25:18Z Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion Qian, Wei Objectives: The purpose of the present study was to examine the effect on root canal wall dentin and compare the level of erosion caused by different irrigation sequences. Material and methods: Dentin specimens of the middle third of the root of extracted teeth with one root canal were instrumented and randomly divided into five groups. Each group was subjected to 17% ethylenediaminetetraacetic acid (EDTA), 17% ethylene-glycoltetraacetic acid (EGTA), or 10% citric acid (CA) and 5.25% sodium hypochlorite (NaOCl) varying the time of irrigation and the order of the irrigants. The blocks were prepared for and examined by scanning electron microscopy. Digital images at a magnification of 2000× were taken at randomized areas on the root canal dentin surface, and the area of tubule openings was measured by a semi-automatic method using image analysis software image-Pro Discovery 5.0. Results: Erosion of peritubular and intertubular dentin was detected when EDTA, EGTA or CA were used as the initial rinse (even for 30 s ), followed by 5.25% NaOCl. The area of dentin tubule opening increased markedly when compared to the sequences where NaOCl was used first, before the chelators or CA (P<0.05). An initial rinse with the chelators or CA for 5 min, followed by a final rinse with NaOCl, regardless of the duration of the NaOCl rinse (1 - 5 min), resulted in over 100% increase in the area of dentin tubule openings (P<0.01). Conclusions: Irrigation using 5.25% sodium hypochlorite after demineralization agent(s) on root canal wall dentin with smear layer causes marked erosion at the dentin surface. Dentistry, Faculty of Graduate 2011-08-30T17:30:51Z 2011-08-30T17:30:51Z 2011 2011-11 Text Thesis/Dissertation http://hdl.handle.net/2429/36991 eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ University of British Columbia |
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NDLTD |
language |
English |
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NDLTD |
description |
Objectives: The purpose of the present study was to examine the effect on root canal wall dentin and compare the level of erosion caused by different irrigation sequences. Material and methods: Dentin specimens of the middle third of the root of extracted teeth with one root canal were instrumented and randomly divided into five groups. Each group was subjected to 17% ethylenediaminetetraacetic acid (EDTA), 17% ethylene-glycoltetraacetic acid (EGTA), or 10% citric acid (CA) and 5.25% sodium hypochlorite (NaOCl) varying the time of irrigation and the order of the irrigants. The blocks were prepared for and examined by scanning electron microscopy. Digital images at a magnification of 2000× were taken at randomized areas on the root canal dentin surface, and the area of tubule openings was measured by a semi-automatic method using image analysis software image-Pro Discovery 5.0. Results: Erosion of peritubular and intertubular dentin was detected when EDTA, EGTA or CA were used as the initial rinse (even for 30 s ), followed by 5.25% NaOCl. The area of dentin tubule opening increased markedly when compared to the sequences where NaOCl was used first, before the chelators or CA (P<0.05). An initial rinse with the chelators or CA for 5 min, followed by a final rinse with NaOCl, regardless of the duration of the NaOCl rinse (1 - 5 min), resulted in over 100% increase in the area of dentin tubule openings (P<0.01). Conclusions: Irrigation using 5.25% sodium hypochlorite after demineralization agent(s) on root canal wall dentin with smear layer causes marked erosion at the dentin surface. === Dentistry, Faculty of === Graduate |
author |
Qian, Wei |
spellingShingle |
Qian, Wei Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
author_facet |
Qian, Wei |
author_sort |
Qian, Wei |
title |
Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
title_short |
Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
title_full |
Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
title_fullStr |
Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
title_full_unstemmed |
Quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
title_sort |
quantitative analysis of the effect of irrigation sequences on root canal wall dentin erosion |
publisher |
University of British Columbia |
publishDate |
2011 |
url |
http://hdl.handle.net/2429/36991 |
work_keys_str_mv |
AT qianwei quantitativeanalysisoftheeffectofirrigationsequencesonrootcanalwalldentinerosion |
_version_ |
1718583011879944192 |