CAJ | 학술논문

目的研究7种不同的光复合树脂热循环试验后的机械性能,探讨各性能之间的关系.方法将每种树脂(A110:AH、ESTELITE∑:ET、AELITE:AT、Z250:ZS、CharmFil plus:CP、Z350:ZH、Grandio:GD,其中AH、ET为微充填复合树脂,AT、ZS、CP为混合型复合树脂,ZH、GD为纳米型复合树脂)制成直径为12mm,厚度为1.0mm的实验样本.所得样本在37℃的蒸馏水中浸泡24 h,然后在5℃和55 ℃下间隔15s冷热循环1 000次.应用尖端速率为0.5 mm/min的双轴挠曲强度试验测量材料的强度值(ISO4049),所得数据采用Weibull和ANOVA统计学分析.样本断面经扫描电镜观察,剩余样本碎片经Knoop硬度试验测试(负载50 9,时间10 s).结果最高和最低的Weibull系数值分别出现在AH(18.752)和AT(5.290)组,最高和最低的双轴挠曲强度值分别出现在ZS(158.2MPa)和ET(54.0 MPa)组.不同填料的强度值大小依次为混合型复合树脂＞纳米型复合树脂＞微充填复合树脂,具有相同类型填料的复合树脂之间的强度值差异没有统计学意义(P＞0.05),且强度试验所得碎片的数量与材料强度大小成正相关.GD组的硬度值最大(110.81+14.77) kg/mm2,AH组平均硬度值最小(42.81±1.91) kg/mm2,复合树脂的强度值与硬度值成正相关.扫描电镜观察显示树脂基质和填料之间是裂痕形成的薄弱部位.结论纳米型复合树脂比混合型复合树脂更适于临床应用.Knoop硬度实验是否适用于复合树腊材料的硬度测量还需要进一步证实.
목적 연구7충불동적광복합수지열순배시험후적궤계성능,탐토각성능지간적관계.방법 장매충수지(A110:AH、ESTELITE∑:ET、AELITE:AT、Z250:ZS、CharmFil plus:CP、Z350:ZH、Grandio:GD,기중AH、ET위미충전복합수지,AT、ZS、CP위혼합형복합수지,ZH、GD위납미형복합수지)제성직경위12mm,후도위1.0mm적실험양본.소득양본재37℃적증류수중침포24 h,연후재5℃화55 ℃하간격15s랭열순배1 000차.응용첨단속솔위0.5 mm/min적쌍축뇨곡강도시험측량재료적강도치(ISO4049),소득수거채용Weibull화ANOVA통계학분석.양본단면경소묘전경관찰,잉여양본쇄편경Knoop경도시험측시(부재50 9,시간10 s).결과 최고화최저적Weibull계수치분별출현재AH(18.752)화AT(5.290)조,최고화최저적쌍축뇨곡강도치분별출현재ZS(158.2MPa)화ET(54.0 MPa)조.불동전료적강도치대소의차위혼합형복합수지＞납미형복합수지＞미충전복합수지,구유상동류형전료적복합수지지간적강도치차이몰유통계학의의(P＞0.05),차강도시험소득쇄편적수량여재료강도대소성정상관.GD조적경도치최대(110.81+14.77) kg/mm2,AH조평균경도치최소(42.81±1.91) kg/mm2,복합수지적강도치여경도치성정상관.소묘전경관찰현시수지기질화전료지간시렬흔형성적박약부위.결론 납미형복합수지비혼합형복합수지경괄우림상응용.Knoop경도실험시부괄용우복합수석재료적경도측량환수요진일보증실.
Objective To examine the changes of the mechanical properties of 7 different light-cured composite resins after thermal cycling and the correlations between these properties.Methods Seven different light-cured composite resins,including 2 microfilled composites (A110:AH and ESTELITE ∑:ET),3 microhybrid composites (AELITE:AT,Z250:ZS,and CharmFil plus:CP),and 2 nanohybrid composites (Z350:ZH and Grandio:GD),were prepared into test specimens with a diameter of 12 mm and a thickness of 1.0 mm.The specimens were stored in distilled water at 37 ℃ for 24 h prior to 1 000thermal cycles of 5 ℃ for 15 s and 55 ℃ for 15 s.The biaxial flexural strength (of) was tested using the ball-on-three-ball method at a crosshead speed of 0.5 mm/min (ISO4049).The fracture surface was observed under scanning electron microscope (SEM),and the remaining specimens underwent Knoop hardness test with a 50-g loading for 10 s.Results The highest and lowest Weibull modulus was observed in AH (18.752) and AT (5.290) group,respectively.The highest and lowest biaxial flexural strength was observed in ZS (158.2 MPa) and ET (54.0 MPa) groups,respectively.The off of the tested materials decreased in the order of microhybrid composite,nanohybrid composite,and microfiller composite,and the of showed no significant difference between the composites with a similar filler (P＞0.05).The fracture number was positively correlated tothe strength of the material.The Knoop hardness numbers (H) was the highest in GD group (110.81+ 14.77 kg/mm2) and the lowest in AH group (42.81+ 1.91 kg/mm2).SEM showed that the interface region of the matrix and the filler was vulnerable to crack formation.Conclusion The nanohybrid composite resins better suit clinical applications than microhybrid composites.The applicability of Knoop hardness test in hardness measurement of the composite resins needs to be further demonstrated.