가시광선 광조사기와 plasma arc curing unit의 광중합 복합레진의 두께와 시간에 따른 중합률의 비교
THE COMPARISON OF VISIBLE LIGHT CURING UNIT AND PLASMA ARC CURING UNIT WITH THE DEGREE OF CONVERSION OF COMPOSITE RESIN
구강과학- 전남대학교 2001년 13권 2호 p.211 ~ 225
박재홍, 양규호,
소속 상세정보
박재홍 ( ) - 전남대학교 치과대학 소아치과학교실
양규호 ( ) - 전남대학교 치과대학 소아치과학교실
KMID : 0988420010130020211
Abstract
The light curing composite resins are now widely used as restorative materials, cavity linings, and luting agents. The depth and time of curing required for these resins were recommended by the manufacturer. In addition, to reduce polymerization shrinkage, incremental placement was recommended. This necessitates an extended curing time. Recently a curing light with high light intensity to reduce the total curing time was developed, which used plasma technology.
Thy purpose of this study was to evaluate plasma are curing unit compared to conventional visible light curing unit. For evaluation of curing ability, the intensity of light and the degree of conversion were measured and compared. The light intensity was measured by radiometer. The degree of conversion of carbon double bonds to single bonds in the composite resin was measured by means of the Fourier transform infrared spectrometer.
The cylindrical aluminum molds of 7.3mm diameter were used. The molds were 1mm, 2mm and 3mm in depth to produce resin samples of various thickness. Each sample was irradiated for curing time of 1sec, 2sec and 3sec in the plasma are curing unit and 15sec and 45sec in the visible light curing unit.
The results obtained were as follows.
1. The light intensity was 568 mW/cm2 in visible light curing unit and was 1930 mW/cm2 in plasma are curing unit.
2. The degree of conversion of the plasma arc curing unit was higher than that of the visible light curing unit on the curing surface.
3. On the bottom of the resin specimen, the degree of conversion decreased significantly according to an increase in curing depth of the visible light curing unit and plasma arc curing unit(p<0.05). The degree of conversion is higher in visible light curing unit than in plasma arc curing unit at a depth of 1, 2 and 3mm respectively.
4. In the visible light curing unit, the degree on conversion increased significantly as light curing time increased as a depth of 3mm, except at 1mm and 2mm. In the plasma arc curing unit, the degree of conversion increased significantly as light curing time increased at a depth of 1, 2 and 3mm(p<0.05).
From the above results, it was suggested that when light curing composite resin is irradiated by plasma arc curing unit, should be cured with 1 2mm by incremental placement and required extended light curing time.
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