The purpose of this study was to evaluate the sealing ability of a calcium hydroxide plug treated with a bonding agent. Ninety extracted human anterior teeth and premolars with single canal were used in this study. Crowns were removed, the canals
were
instrumented, and the roots were randomly divided into three groups of 30 each.
In control group, a single apical seat was prepared with #60 K file 1mm short of the apex and the root canal was obturated with Gutta-percha and Sealapex by the lateral condensation method. In experimental group 1 and group 2, to prepare an
apical
isthmus of 1mm in length, the first apical seat was prepared with a #45 K file 1mm short of the anatomical apex and with a #60 K file 2mm short for the second apical seat. Dry calcium hydroxide powders were packed in the apical isthmus with a
hand
plugger and #60 K file and then, the root canal was obturated with Gutta-percha and Sealapex by the lateral condensation method. In experimental group 2, following an application of the bonding agent to the plug, the root canal was obturated in
the
same
way.
The teeth of each group were immersed in a 2% methylene blue dye solution for 1, 2, and 4 weeks. The distance from the tip of the cone to the deepest penetration was measured using the tool maker's microscope.
@ES The results were as follows:
@EN 1. The teeth having the calcium hydroxide plug treated with the dentin bonding agent(experimental group 2) showed the lowest leakage with 1.4705mm and the control group without apical plug(no apical isthmus) showed the highest leakage with 3.
1735mm.
2. The control group without apical plug showed higher leakage tha experimental group 1 having the calcium hydroxide plug treated without the dentin bonding agent(p>0.05).
3. The control group without apical plug and experimental group 1. Having the calcium hydroxide plug treated without the dentin bonding agent, showed higher leakage than experimental group 2, having the calcium hydroxide plug treated with the
dentin
bonding agent(p<0.001).
4. The immersion time had no significant effect on the degree of leakage.
In conclusion, the results showed that the calcium hydroxide plug treated with the dentin bonding agent could decrease the microleakage from the root apex effectively.
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