不同聚合方式对软衬硅橡胶与聚甲基丙烯酸甲酯抗剪切强度的影响

发布时间：2018-08-09 12:01

【摘要】：目的比较两种软衬硅橡胶在热固化和室温固化条件下,其与聚甲基丙烯酸甲酯(PMMA)的粘接强度。方法水浴加热法制得50 mm×10 mm×3 mm PMMA试片48片,并随机分成4组。以Ufi Gel P(UGP)为软衬材料,制作热固化组(A1组)和室温固化组(A2组)试件。以Silagum-Comfort(SLC)为软衬材料,制作热固化组(B1组)和室温固化组(B2组)试件。每组试件各6个。采用电子万能材料试验机对试件进行抗剪切强度测试,并在光学显微镜、扫描电子显微镜(SEM)下观察粘接界面、固化后软衬硅橡胶和打磨后PMMA的表面形态。结果 A1、A2、B1、B2组的抗剪切强度分别为(2.39±0.24)、(1.74±0.27)、(3.09±0.26)、(2.21±0.29)MPa。A1与A2、B1与B2、A1与B1、A2与B2组间的差异均有统计学意义(P0.05)。光学显微镜和SEM下可见,固化后UGP体部有大量的气泡,SLC无气泡;PMMA表面较为粗糙;各组粘接界面均连续、均匀、密实,A2、B2组粘接界面有须状微突起物。结论 UGP、SLC与PMMA的抗剪切强度均达到了0.44 MPa的临床最低使用标准;UGP与PMMA的抗剪切强度高于SLC与PMMA;热固化方式获得的抗剪切强度高于室温固化方式。
[Abstract]:Aim to compare the bonding strength of two kinds of soft lined silicone rubber with polymethyl methacrylate (PMMA) under heat curing and room temperature curing. Methods 48 PMMA specimens of 50 mm 脳 10 mm 脳 3 mm were obtained by water bath heating method and were randomly divided into 4 groups. The specimens of heat curing group (A1 group) and room temperature curing group (A2 group) were made with Ufi Gel P (UGP) as soft lining material. Using Silagum-Comfort (SLC) as soft liner, the specimens of heat curing group (B1 group) and room temperature curing group (B2 group) were made. There were 6 samples in each group. The shear strength of the specimens was tested by electronic universal material testing machine. The bonding interface was observed under optical microscope and scanning electron microscope (SEM). The surface morphology of soft lined silicone rubber and polished PMMA was observed. Results the shear strength of group A _ (1) A _ (2), (was (2.39 卤0.24), (1.74 卤0.27), () 3.09 卤0.26), (2.21 卤0.29) MPa.A1 and A _ (2) B _ (1) and B _ (2) A _ (1) A _ (1) and B _ (1) A _ (2) were significantly different from B _ (2) (P 0.05). Under optical microscope and SEM, there were a large number of air bubbles in the body of UGP. The surface of PMMA was rough, the bonding interface of each group was continuous and uniform, and the bonding interface of A _ 2O _ 2 / B _ 2 group had whisker microprotrusions. Conclusion the shear strength of both PMMA and UGP is 0.44 MPa. The shear strength of UGP and PMMA is higher than that of SLC and PMMA, and the shear strength of heat curing is higher than that of room temperature curing.
【作者单位】：南昌大学第三附属医院口腔科;南昌大学附属口腔医院口腔修复科;南昌县人民医院口腔科;
【基金】：江西省卫生厅课题基金资助项目(20113063) 江西省科技支撑计划基金资助项目(2008BA04300)
【分类号】：R783.1

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