광중합 시 공기 중 산소의 차단이 치면열구전색제의 중합에 미치는 영향
The effects of blocking the oxygen in the air during thepolymerization of sealant
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할로겐, 플라즈마 그리고 2세대 고강도 LED 광중합기를 이용하여 치면열구전색제를 중합하는 과정에서 산소 차단 용액인 glycerin gel(DeOx)의 도포, 질소가스와 탄산가스를 분사시켜 공기 중 산소와의 접촉을 차단시킨 후 산소억제층의 두께, 치면열구전색제의 중합률 그리고 표면경도를 측정, 평가하였다. 각각의 제작된 시편을 HPLC에서 역상크로마토그래피를 이용하여 미반응 모노머 TEGDMA의 용출양을 측정하여 중합률을 평가하였고, Vickers hardness tester 를 이용하여 표면미세경도를 측정, 광학현미경을 이용하여 산소억제층의 두께를 측정하여 다음과 같은 결과를 얻었다. 1. 질소 및 탄산가스를 분사하면서 중합한 군, DeOx를 도포한 후 중합한 군 모두 공기 중에서 중합한 군보다 TEGDMA 용출량이 감소되었다(p<0.05). 2. 할로겐 광으로 20초간 중합한 경우 DeOx를 도포한 군과 질소 및 탄산가스를 분사한 군의 TEGDMA 용출량은 유사하였지만(p>0.05), 40초로 중합한 경우 탄산가스 분사군이 질소가스 분사군보다 TEGDMA 용출량이 적었다(p<0.05). 3. 플라즈마 광으로 10초간 중합한 경우 DeOx를 도포한 군의 TEGDMA 용출량이 가장 적었고(p<0.05), 탄산가스 분사군이 질소가스 분사군보다 용출량이 적었다(p<0.05). 4. LED 광원에서는 탄산가스 분사군이 질소가스 분사군보다 TEGDMA의 용출량이 적었다(p>0.05). 5. 세 광원 공히 공기 중에서 중합한 군보다 산소를 차단한 상태에서 중합한 군에서 미세경도가 크게 나타났다(p<0.05). 6. DeOx로 처리했을 때 플라즈마 광 10초와 LED 광 20초 중합군이 할로겐 광 40초 중합군보다 미세경도 값이 높았고, 질소가스와 탄산가스 분사하에서 플라즈마 광으로 10초간 중합한 경우와 LED 광으로 20초간 중합 한 경우가 할로겐 광으로 40초간 중합한 경우 보다 높은 미세경도 값을 보였다(p<0.05). 7. 세 광원 모두 공기 중에서 중합한 군에 비해 질소 및 탄산가스 분사를 분사하면서 중합한 군, DeOx를 도포한 후 중합한 군이 산소억제층의 두께가 평균 49%의 감소되었으며(p<0.05), 이들 산소를 차단한 군 간의 유의차는 없었다.
Abstract
The purpose of this study was to evaluate the efficacy of blocking the oxygen in the air during the polymerization of sealant. All curing were performed with various light curing units under the pplication of oxygen gel barrier, stream of nitrogen and carbon dioxide gas for inhibition of oxygen diffusion into sealant surface. The results of present study can be summarized as follows: 1. The amount of eluted TEGDMA form the specimens cured with all the three different light units in the stream of N2 and CO2 gas and application of Oxygen gel barrier(DeOx) were significantly lower than in the room-air atmosphere(Control)(p<0.05). 2. In the DeOx application, the amount of eluted TEGDMA the specimen cured with PAC light for 10seconds was less than that cured in the stream of N2 and CO2 atmospheric conditions(p<0.05). 3. In the LED using 10 or 20sec irradiation times under the stream of N2 and CO2, the eluted TEGDMA showed to be no statistically significant difference(p>0.05). 4. The microhardness from the specimens cured with all the three different light units under each treated conditions were significantly higher than in the room-air atmosphere(p<0.05). 5. The surface treatment by DeOx, N2 and CO2 reduces the thickness of oxygen inhibited layer by approximately 49% of the untreated control value.
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