광중합형 수복용 복합레진의 인장강도에 미치는 thermal cycling과 시효 처리의 영향
Effect of Thermal Cycling and aging on the Tensile Strength of Light-Cured Restorative Composites
소속 상세정보
백상현
채민수/이주형/김태조/배태성/백상현/채민수/이주형/김태조
KMID : 0362219980250010029
Abstract
결론
본 연구에서는 구강환경과 유사한 액상의 조건하에서의 온도변화가 복합레진 수복물의 인
장강도에 미치는 영향을 평가하기 위해, 최근 치과임상에서 사용되고 있는 5종의 광중합형
수복용 복합레진을 시험재료로 선택한 다음 수중에서의 thermal cycling과 시효처리가 인장
강도에 미치는 영향에 관하여 조사하였으며, 다음과 같은 결론을 얻었다.
1. Weibull 분포는 single-mode에 잘 일치하는 경향을 보였으며(r2>0.86),
모든 시험군에서 thermal cycling 후 특성강도와 Weibull 계수의 감소를 나타냈다.
2. thermal cycling 후의 특성강도는 CF군에서 가장 높게 나타났으나, Weibull 계수는 AF
군에서 가장 높게 나타났다.
3. thermal cycling 후의 인장강도는 CF군이 83.92MPa로 가장 높고 AG군이 13.91MPa로
가장 낮게 나타났으며, HM군과 AG군을 제외한 나머지 군들 사이에서 상호간에 유의한 차
이를 나타전다(p<0.05).
4. 큰 입자의 필러가 분산된 hybrid형의 AF군과 CF군에서는 필러의 파절이 관찰되었다.
The improvement in the mechanical properties of restorative composites has
contributed to their increased use in recent years. In spite of their growing popularity,
composites still have low resistance to fracture and wear in oral environments. This
study was performed to examine whether the tensile strengths of light-cured restorative
composites were affected by thermal cycling and aging in water. Five commerically
available light-activated composites(Heliomolar : HM, Aelitefil : AF, Amelogen : AG,
Clearfil AP-X : CF, Z100 : ZH) were used. Rectangular tension test specimens were
fabricated in a teflon mold giving 5 mm in gauge length and 2 mm in thickness. All
samples were divided into 3 groups. Group 1 was stored in a desiccator for 10 days.
Group 2 was immersed in a 37℃ distilled water for 10 days. Group 3 was subjected to
10,000 thermal cycles between 5℃ and 55℃, and the immersion time in each bath was
15 seconds per cycle. Tensile testing was carried out at a crosshead speed of 0.5
mm/min and fracture surfaces were observed with scanning electron microscope.
The results obtained were summarized as follows;
1. The strength data were fit to single-mode Weibull
distribution(r2>0.86) and Weibull parameters decreased after thermal
cycling test.
2. The highest characteristic strength was observed in the CF group but the highest
Weibull modulus was obtained in the AF group after thermal cycling test.
3. The highest tensile strength value of 83.92 MPa was obtained in the CF group and
the lowest value of 13.91 MPa was obtained in the AG group. Tensile strengths showed
no significant difference between HM and AG groups but other groups showed the
significant differences in each group(p<0.05).
4. According to the microscopic observation of the fracture surfaces, fractures of large
fillers were observed in the hybrid composites of the AF and CF groups.
키워드
light-cured restorative composite; tensile strength; thermal cycling; aging in water;
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