| Summary: | The most widely used intracanal medicament is calcium hydroxide
(Ca(OH2). However, the residue of Ca(OH)2 in the root canal must be removed
prior to obturation. The residue of Ca(OH)2 in the root canal walls would result in
apical leakage. This is due to the unstable dimension of Ca(OH)2, reduced flow
and working time of the sealers, and decreased adhesion of sealers and gutta
percha to root canal walls. This study aimed to determine the effect of Ca(OH)2
vehicles and agitation irrigation techniques on the residue of Ca(OH)2 in the
apical third of the root canal walls.
Twenty four extracted mandibular first premolars were used in this study.
The crowns of the teeth were removed at the apical part of cemento enamel
junction ( CEJ ) with a length of 14 mm from the apical. The canals were prepared
with a Step Back technique to obtain Master Apical File ( MAF ) # 40. The
specimens were randomly devided into 4 groups of 6 each. In groups IA and IB,
the pastes of Ca(OH)2+ chlorhexidine digluconate 2% (CHX) mixture were
applied, followed by manual agitation and ultrasonic passive techniques for
eliminating Ca(OH)2 from the root canal . In groups IIA and IIB, the pastes of Ca
(OH)2+ glycerin were applied, followed by manual agitation and ultrasonic
passive techniques. Each specimen of the study was sectioned in the sagittal
direction, then was photographed under a stereo microscope at 120x
magnification. The percentages of Ca(OH)2 residue were calculated using
UTHSCSA image tool 3 software. Data were analyzed using two-way ANOVA at
95% level of significance.
The results revealed that the group of Ca(OH)2+ CHX paste with passive
ultrasonic agitation irrigation technique showed the lowest number of residual
Ca(OH)2. The group of Ca(OH)2+ glycerin paste with manual agitation irrigation
technique showed the highest number of residual Ca(OH)2.
The conclusion of this study was that the vehicles and the agitation
irrigation techniques affected the total residue of Ca(OH)2.
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