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Tae-Sun Yoon 2 Articles
Cytotoxicity of newly developed pozzolan cement and other root-end filling materials on human periodontal ligament cell
Minju Song, Tae-Sun Yoon, Sue-Youn Kim, Euiseong Kim
Restor Dent Endod 2014;39(1):39-44.   Published online January 20, 2014
DOI: https://doi.org/10.5395/rde.2014.39.1.39
AbstractAbstract PDFPubReaderePub
Objectives

The purpose of this study was to evaluate in vitro cytotoxicity of the pozzolan cement and other root-end filling materials using human periodontal ligament cell.

Materials and Methods

Endocem (Maruchi), white ProRoot MTA (Dentsply), white Angelus MTA (Angelus), and Super EBA (Bosworth Co.) were tested after set completely in an incubator at 37℃ for 7 days, Endocem was tested in two ways: 1) immediately after mixing (fresh specimens) and 2) after setting completely like other experimental materials. The methods for assessment included light microscopic examination, cell counting and WST-1 assay on human periodontal ligament cell.

Results

In the results of microscopic examination and cell counting, Super EBA showed significantly lower viable cell than any other groups (p < 0.05). As the results of WST-1 assay, compared with untreated control group, there was no significant cell viability of the Endocem group. However, the fresh mixed Endocem group had significantly less cell viability. The cells exposed to ProRoot MTA and Angelus MTA showed the highest viability, whereas the cells exposed to Super EBA displayed the lowest viability (p < 0.05).

Conclusions

The cytotoxicity of the pozzolan cement (Endocem) was comparable with ProRoot MTA and Angelus MTA. Considering the difficult manipulation and long setting time of ProRoot MTA and Angelus MTA, Endocem can be used as the alternative of retrofilling material.

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Pulp vitality and coronal discoloration following traumatic injuries
Tae-Sun Yoon, Hyung-Gyu Kong, Euiseong Kim
J Korean Acad Conserv Dent 2010;35(6):492-496.   Published online November 30, 2010
DOI: https://doi.org/10.5395/JKACD.2010.35.6.492
AbstractAbstract PDFPubReaderePub

Coronal discoloration is a common sequela to traumatic injuries. In subluxation cases, although the injury is not strong enough to rupture the apical vessels, discoloration may appear by tearing thin walls or occluding small capillaries. In absence of infection pulpal regeneration can occur, and as a result discoloration may completely or partially subside. But judging pulpal status by coronal discoloration can be dangerous and it may lead to unnecessary treatment.

This case presents coronal discoloration and recovery following traumatic injury of maxillary anterior teeth. In diagnosing traumatized teeth routine cold tests or electric pulp tests are known to be unreliable, but with the aid of ultrasound doppler imaging, assessing pulp vitality of traumatized teeth can be more accurate.

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