The purpose of this study was to observe the degree of surface obliteration of dentinal tubule using Gluma® desensitizer and MS coat® with 15 specimens made out of 15 extracted lower incisors. They were divided into Root planning group(control), Gluma® desensitizer group(testI) and MS coat® group(testII).

Degree of obliteration was examined under the scanning electron microscope(×2000).

The following results were obtained :

In the root planning group(control), the complete open of dentinal tubule surface was accounted for 73.8%, the partial obliteration for 17.2% and the complete obliteration for 9.0%.

In the Gluma® desensitizer group (test I), the complete open of dentinal tubule surface was accounted for 23.6%, the partial obliteration for 42.8% and the complete obliteration for 33.6%.

In the MS coat® group (test II), the complete open of dentinal tubule surface was accounted for 19.2%, the partial obliteration for 45.6% and the complete obliteration for 35.2%.

The average number of open dentinal tubules in the control was significantly higher than in the testI and II(P<0.05), but there were no statistically significant differences between the test I and II.

The average number of the partially obliterated and the completely blocked dentinal tubules in the control was significantly lower than the testI and II(P<0.05), but there were no statistically significant differences between the test I and II.

The results of this study suggest that Gluma® desensitizer and MS coat® is significantly effective on dentinal tubule obliteration, therefore they were effective on hypersensitivity caused by periodontal treatment.