광중합형 글라스아이오노머 시멘트 혼화후 광중합 개시까지의 경과시간이 굴곡강도에 미치는 영향
THE EFFECT OF THE LAPSE OF TIME ON FLEXURAL STRENGTH AS MEASURED FROM THE HIKING OF LIGHT-CURED GLASS-IONOMER CEMENT TO THE INITIATION OF LIGHT CURING
김광주, 기우천,
소속 상세정보
김광주 ( ) - 경희대학교 의과대학 내과학교실
기우천 ( ) - 경북대학교 치과대학 소아치과학교실
KMID : 0358919940210010263
Abstract
요약
광중합형 글라스아이오노머 시멘트의 혼화후 중합광선을 조사하기까지의 경과시간이 시멘
트의 굴곡강도에 미치는 영향에 대해 알아보기위해 광중합형 글라스아이오노머 시멘트Fuji
ⅡLC(shade A2 G.C. Co., Japan)와 자가 중합형 글라스아이노머 시멘트 Fuji
Ⅱ(shade 21,6. G.C. Co., Japan)를 사용하여 혼화후 바로 광조사한 군(1분 30초), 혼화 후 2
분, 3분, 4분, 5분후에 광조사한 군들과 자가중합형 시멘트 군으로 나누었다. 광중합형 글라
스아이오노머 시멘트는 혼화 후 mold에 주입하여 40초간 광조사하고 A', B', C', D',2'군은
광조사한 후 즉시 굴곡강도를 측정하고 A, B, C, D,2군은 혼화시부터 30분 후에 37℃ 항온
조에 넣어 24시간 동안 보관한 후 시편을 mold에서 분리하여 3점굴곡시험으로 굴곡강도를
측정하여 다음과 같은 결과를 얻었다.
출광중합형 글라스아이오노머 시멘트의 굴곡강도는 흔화 후 광중합 개시 까지의 경과시
간이 증가함에 따른 차이는 없었다(p<0.01).
광중합형 글라스아이오노머 시멘트의 광중합후 24시간 후의 굴곡강도는 광중합 직후의
굴곡강도에 비해 높게 나타났다(p<0.01).
광중합형 글라스아이오노머 시멘트의 굴곡 강도는 각 군에서 모두 자기중합형 글라스 아
이오노머 시멘트에서 보다 높게 나타났다 (p<0.01).
주사전자현미경으로 관찰시 저배율에서 광중합형 글라스아이오노머 시멘트의 파절면은
시멘트 혼화 후 광중합 개시까지의 경과시간의 경과시간이 1분에서 5분까지 증가함에 따른
특이한 차이점은 없었으나 자가중합형 글라스아이오노머 시멘트에서 미세한 균열 이 있는
소견을 보였고 고배율에서는 광중합형 시멘트의 경우 불규칙한 파괴양상을 나 타내었으나
자가중합형 시멘트의 경우 파절양상을 나타내었다.
#초록#
The purpose of this study was to evaluate the effect of the lapse of time on flexural
strength as measured from the mixing of light-cured glass-ionomer cement to the
initiation of light curing:
The specimens were ade of light-cured glass-ionmer cement(Fuji Ⅱ LC, shade
A2,G. C. Co., Japan) and self-cured glass-ionomer cement(Fuji Ⅱ, shade
21, G. C. Co., Japan), and then divided into 6 groups.
In the first group(A), light-cured glass-ionomer cement was mixed according to the
manufacturer's direction, injected into the mold, and then exposed to the light
immediately after cement was injected into the mold(about 1.5 minute. The samples of
the second group(B) exposed to light after 2 minutes from the mixing of the cement,
the third(C) was a(text 3 minutes, the forth(D) was after 4 minutes and fifth(E) was
after 5 minutes, The sixth group was self-cured glass-ionomer cement.
The samples were light-cured for 40 seconds. After light curing was finished, the
samples were left in the mold for 30 minutes from mixing. Then the samples in the
modls were stored in a 37℃I water bath for 24 hours.
After that the flexural strength was measured by a three-point bending test and then
examined under scanning electron microscope.
And other sample groups A', B', C', D', E' were made as the same method above,
and measured flexural strength immediately after light curing.
The results of this study were as follows.
The flexural strength of the light-cured glass-ionomer cement showed no statistical
diffrences as the lapse of time form the mixing of the cements to the initiation of light
curing increased from 1 to 5 minutes.
The flexural strength of the light-cured glass-ionomer cements measured after 24
hours showed higher values than that measured immediately after light cured.
When light-cured glass-ionomer cement groups were compaired with the self-cured
glass inomer group, the flexural strength of light-cured groups was much higher than
that of the self-cured group.
As seen under the scanning electron microscopy, the fractured surfaces of the samples
of light-cured glass-ionomer cements exhibited no differences as the lapse of time
increased from 1 to 5 minutes. However in the fractured surfaces of the self-cured
glass-monomer cement, there were microcracks( 60).
At high magnification view( 1000), the fractrued surfaces of light-cured
galss-ionomenr cements exhibited irregular patterns but that of self-cured glass-ionomer
cements smoother patterns.
키워드
원문 및 링크아웃 정보
등재저널 정보