Heated distilled water with or without continuous ultrasonic irrigation improves final irrigation efficacy and reduces dentine erosion

The present study evaluated the effects of using heated distilled water (HDW), with or without continuous ultrasonic irrigation (CUI), on smear layer removal and deterioration of root dentine microstructure. After chemomechanical preparation, 60 human teeth were longitudinally cleaved into two halve...

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Bibliographic Details
Published in:Journal of dentistry 2020-12, Vol.103, p.103507, Article 103507
Main Authors: dos Santos, Michelli Cássia, da Silveira Teixeira, Cleonice, da Fonseca Roberti Garcia, Lucas, Henriques, Bruno, Tay, Franklin R., Bortoluzzi, Eduardo Antunes
Format: Article
Language:English
Subjects:
Chelation
Debridement
Dental Pulp Cavity
Dentin
Dentistry
Distilled water
Edetic Acid
EDTA
Endodontics
Erosion
Ethylenediaminetetraacetic acids
Humans
Hypotheses
Irrigated areas
Irrigation
Lavage
Microscopy, Electron, Scanning
Microstructure
NaOCl
Root Canal Irrigants
Root Canal Preparation
Root canals
Scanning electron microscopy
Silicones
Smear Layer
Sodium Hypochlorite
Teeth
Tubules
Ultrasonics
Ultrasound
Viscosity
Water
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Summary:The present study evaluated the effects of using heated distilled water (HDW), with or without continuous ultrasonic irrigation (CUI), on smear layer removal and deterioration of root dentine microstructure. After chemomechanical preparation, 60 human teeth were longitudinally cleaved into two halves for smear layer quantification at the cervical-third, middle-third and apical root-third of the canal space. After reassembly, the root canals were irrigated with 17 % EDTA, followed by one of the six final irrigation protocols (n = 10) - G1: conventional irrigation (CI)+NaOCl at 25 °C; G2: NaOCl at 25 °C + CUI; G3: CI with DW at 25 °C; G4: DW at 25 °C + CUI; G5: CI + HDW at 65 °C; G6: HDW at 65 °C + CUI. Tooth-halves were processed and examined by scanning electron microscopy. The percentage of opened dentinal tubules in the irrigated areas of the canal space was expressed as a percentage of the total surface area. Dentine erosion was classified by numeric scores. Smear layer removal was analysed with ANOVA and Student-Newman-Keuls tests; dentine erosion was analysed with Cohran-Mantel-Haenstel statistic (α = 0.05). The cervical-third had a higher percentage of open dentinal tubules for all groups (p 
ISSN:0300-5712
1879-176X
DOI:10.1016/j.jdent.2020.103507