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| LETTER TO EDITOR |
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| Year : 2014 | Volume
: 4
| Issue : 3 | Page : 158 |
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Microhardness of root canal dentin
Vasudev Ballal
Department of Conservative Dentistry and Endodontics, Manipal College of Dental Sciences, Manipal University, Manipal, Karnataka, India
| Date of Web Publication | 6-Aug-2014 |
Correspondence Address:
Vasudev Ballal
Department of Conservative Dentistry and Endodontics, Manipal College of Dental Sciences, Manipal University, Manipal, Karnataka
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/1658-5984.138154
How to cite this article:
Ballal V. Microhardness of root canal dentin. Saudi Endod J 2014;4:158 |
Sir,
I read with great interest the article entitled "Effect of calcium hydroxide pastes and vehicles on root canal dentin microhardness" by Pacios MG et al., which has been published in your esteemed journal (Saudi Endodontic Journal 2014;4 (2);53-57). It was a good clinically relevant study, evaluating the effect of different vehicles used to mix calcium hydroxide on the microhardness of root canal dentin. I want to share few of my thoughts regarding this article. First, instead of microhardness, nanoindentation apparatus could have been used since dentin is a soft composite material. Second, instead of sectioning the roots horizontally, the authors could have prepared the root canal, then filled the canal with the test agents for the respective time periods and then sectioned the roots longitudinally and evaluated for the microhardness of root canal dentin. By doing this methodology, it could have simulated the clinical scenario. Third, microhardness should have been evaluated in the coronal, middle and apical thirds of the root canal dentin, since the hardness of root canal dentin varies in different portions of the root canal system. Fourth, how was a "drop" of vehicle/paste standardized? Fifth, commercially available calcium hydroxide paste could also have been used so that, there won't be any bias in standardizing the amount of test materials. Sixth, how was a drop of test vehicle made to retain in the same area of root canal dentin especially for 14 days? Instead, the samples could have been immersed in the test vehicles for respective time periods. Hence, authors can perform further similar studies using the above mentioned parameters for the better appreciation of the results.
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