열중합과 열순환에 따른 치과용 콤포짓트레진 상아질 결합강도와 표면특성
Effect of Heat Curing and Thermal Cycling on the Dentin Bond Strength and Surface Property of Dental Composite Resins
소속 상세정보
이용근/Yong-Keun Lee
KMID : 0362219980250010051
Abstract
결론
1. 열중합에 부가에 따른 비커스경도의 변화는 VFP의 경우 열중합후 경도가 모두 유의하
게 높았으나(p<0.05), CRI에서는 열중합이 경도에 거의 영향이 없었다. VFP는 열순환 후
경도가 유의하게 감소하였으나(p<0.05), CRI는 열순환에 따른 경도의 변화가 적었다.
2. 열순환하지 않는 시편과 열순환한 시편간의 색차 (CIE △I)는 VFP의 경우 3.105-8.070,
CRI의 경우 3.157∼8.752로 육안으로 구별할 수 있는 변색을 보였다.
3. 열중합 부가에 따른 색차(CIE △I)를 열순환 이전의 조건에서 보면 VFP에서 2.725∼
3.934, CRI에서는 2.879∼6.143으로 나타나 열중합후에 색상이 크게 변하는 것으로 나타났다.
4. VFP와 발거한 사람 치아의 상아질과의 전단결합강도는 6.353∼14.168 MPa로 나타났
다. 열순환을 시행한 콤포짓트레진 시편의 결합강도는 열순환을 하지 않은 시편을 접착한
경우보다 전반적으로 낮았으나, 열중합 부가에 따른 동일처리조건(시멘트, 실란, 열순환)에서
의 결합강도를 t-검정한 결과 모든 조건에서 유의한 차이가 없었다(p>0.05).
5. CRJ와 발거한 사람 치아의 상아질과의 전단결합강도는 6.789∼14.790 MPa로 나타났다.
열중합 부가에 따른 동일처리조건(시멘트, 실란, 열순환)에서의 결합강도를 t-검정한 결과
PAN을 사용한 일부 조건에서 유의한 차이가 있었다(p<0.05).
6. 결합강도는 콤포짓트레진의 종류, 시멘트의 종류, 콤포짓트레진 시편의 열순환 여부에
따라 유의한 영향을 받았다(p<0.05).
The mechanical properties of composite restorations are improved when the composite
is free of voids, and the resin matrix is fully polymerized. Making dense, well-cured
composite resin restoration is best accomplished by additional heat curing. The purpose
of this study was to measure the effect of heat curing or thermocycling of composite
resins on the Vickers hardness, color and bond strength to dentin surface. In bond
strength study, the effects of other variables such as type of cement and silane
treatment were also determined.
Two kinds of composite resin(VFP-direct filling composite resin, CRI-composite resin
for inlay) were studied. Half of the specimens for hardness and color teats were only
light cured and the others were light and heat cured. Vickers hardness and color(CIE
L*, a*, b* values) were measured using
Microhardness tester(Mitsuzawa Seiki Co., Japan) and Differential Colorimeter(Model
TC-6FX, Tokyo Denshoku Co., Japan) before thermocycling, and after thermocycling
between 5∼55 ℃ for 500, 1,000 and 2,000 cycles.
The composite resin specimen for bond strength test was 5 mm in diameter and 6
mm in height. Half of the specimens were only light cured and the others were light
and heat cured. These specimens of not-thermocycled and 1,000 thermocycled were
bonded to the extracted dentin surface with or without silane application. Two kinds of
cement(PAN-adhesive resin cement, FDT-resin modified glass ionomer cement) were
used in bond strength to dentin surface test. After 24 hours, the shear bond strength
was measured using Universal Testing Machine(Zwick 1456, Z020, Germany) with the
cross-head speed of 0.5 mm/min.
From this study, the following results were obtained :
1. The Vickers hardness of VFP was significantly higher after additional heat curing
than that of only light cured specimen(p<0.05), however that of CRI showed a little
change after additional heat curing. The Vickers hardness of VFP decreased significantly
after thermocycling(p<0.05), however that of CRI did not changed significantly.
2. The color difference(CIE ΔE) value of VEP between not-thermocycled specimen
and thermocycled specimen was 3.105∼8.070, and that of CRI was 3.157∼8.752. These
color changes were visually perceivable.
3. The color difference(CIE ΔE) value of VFP between only light cured specimen and
light and heat cured spevimen was 2.725∼3.934, and that of CRI was 2.879∼6.143.
These results indicated that additional heat curing changed the color of composite resins
clinically perceivable.
4. The shear bond strength of VFP to the extracted human dentin surface was 6.35
3∼14.168 MPa. Additional heat curing did not influenced the bond strength(p>0.05),
however the bond strength of thermocycled composite resin specimen was generally
lower than that of not-thermocycled.
5. The shear bond strength of CRI to the extracted human dentin surface was 6.789∼
14.790 MPa. In some cases using PAN as the cement, additional heat curing influenced
the bond strength(p<0.05).
6. The shear bond strength was influenced significantly by the variables of composite
resin, cement and thermocycling(p<0.05).
키워드
composite inlay material; hardness; color difference; bond strength to dentin;
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