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目的:探讨数字图像相关法在研究光固化复合树脂光照收缩变形产生和演化中的价值。方法:6颗新鲜、完整的离体磨牙,随机分为2组,邻面片切平整,制备2.0 mm×2.0 mm×2.0 mm的邻面洞形,洞面酸蚀冲洗,涂黏结剂光照,第1组充填3M Z350纳米树脂,第2组充填3M Valux Plus(V.P)通用型树脂。邻面快速制造散斑,固定于微型试验夹中,光照40 s,同步数码相机采集表面散斑序列图,以数字图像分析软件计算序列图各像素点水平方向(x)和垂直方向(y)位移、应变,采用SPSS 12.01软件包统计线性收缩率,并对20 s时游离面各点位移进行配对t检验。结果:序列图经处理后,相关系数R均>0.98。树脂光照40 s内表现为各向异性收缩,2组材料x方向线收缩率分别为0.439%~0.75%、0.526%~0.834%,y方向线收缩率分别为0.253%~1.34%、0.355%~1.51%。20 s时,游离面Z350组在x和y方向变形均较V.P组小(P<0.05)。结论:应用数字图像相关法研究光固化复合树脂光照过程中的聚合收缩,能有效动态记录、计算全域收缩变形量,为提高临床使用效果提供依据。
Objective: To explore the value of digital image correlation method in studying the light-induced shrinkage deformation of light-cured composite resin. Methods: Six fresh and intact molars were randomly divided into two groups. The adjacent slices were sliced and cut to prepare a 2.0 mm × 2.0 mm × 2.0 mm oval face. The cavities were etched with acid, , Group 1 was filled with 3M Z350 Nano resin and Group 2 filled with 3M Valux Plus (VP) Universal resin. The speckle was rapidly produced on the adjacent surface and fixed in a micro-test clip. The surface of the speckle was captured by a synchronous digital camera for 40 s. The digital image analysis software was used to calculate the horizontal (x) and vertical (y) Displacement and strain were measured. SPSS 12.01 software package was used to calculate the linear shrinkage rate. Paired t-test was performed on the displacement of the free surface at 20 s. Results: After the sequence diagram was processed, the correlation coefficient R was> 0.98. The anisotropy shrinkage of the resin in the 40 s light irradiation was 0.439% -0.75% and 0.526% -0.834% respectively in the two groups. The shrinkage in the y direction was 0.253% -1.34% and 0.355% 1.51%. At 20 s, the deformation of the free surface Z350 group was smaller in the x and y directions than in the V.P group (P <0.05). Conclusion: The digital image correlation method is used to study the polymerization shrinkage of light-cured composite resin during light irradiation. It can effectively record dynamically and calculate the global shrinkage deformation and provide the basis for improving the clinical effect.