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The aim of this in vitro study was to evaluate the effect of calcium hydroxide pastes and their vehicles on microhardness of the root canal dentin.
have proposed associations of calcium hydroxide with different vehicles, such as polyethylene glycol, propylene glycol, glycerin, anesthetics, iodoform, and camphorated p-monochlorophenol to maximize its qualities.The canals were instrumented with the step-back technique up to a #50 master apical K-file (Dentsply Maillefer, Ballaigues, Switzerland).The working length was determined by visualizing the tip of a size 15 K-file (Dentsply Maillefer, Ballaigues, Switzerland) extending beyond the apical foramen and subtracting 1 mm from that length of the file.Hardness is measured as the resistance to the penetration of an indenter, which is necessarily harder than the sample to be analyzed.A hardness test provides a numerical value that allows a distinction between materials submitted to the penetration of a specific indenter.These alterations may also affect the adhesion and sealing ability of sealers to the treated dentin surfaces.
The comparison between calcium hydroxide pastes and their vehicles may evidence if the effect is due to the mixture or particularly to the vehicle itself.
demonstrated that they reduce dentin microhardness; however, there are no studies that comparatively evaluate the influence of calcium hydroxide (CH) vehicles on dentin microhardness.
The clinical relevance of evaluating the effect of calcium hydroxide pastes and vehicles on root canal dentin microhardness is based on the relative softening effect exerted on the dentinal walls that could benefit a rapid preparation of small tight root canals.
The selection of teeth was made on the basis of their similarity in size and morphology and absence of any cracks or defects.
Debris, calculus, and soft tissue remnants on the root surfaces were cleaned using a Gracey curette (Hu-Friedy, California, USA).
A total of 120 specimens were randomly divided into 12 groups.