Keyf F, Uzun G, Mutlu M
Department of Prosthodontics, School of Dentistry, Hacettepe University, Ankara, Turkey.
J Oral Rehabil. 2003 Nov;30(11):1142-8. doi: 10.1046/j.1365-2842.2003.01059.x.
This study focused on some mechanical properties such as the transverse strength, the maximal deflection, and the modulus of elasticity of resin reinforced with two different types of agents-treated and with untreated glass fibre, and without fibre. A Teflon mould was used to prepare six groups of specimens. Two different types of chemical modification agents, hydroxyethyl-methacrylate (HEMA)-monomer and air atmosphere were applied to create hydrophilic surfaces on the glass fibres. The flow rate was kept at two different levels, 25 and 60 mL min-1. The discharge powers of the surface treatment process were 15 or 20 W. The fibres were exposed to glow discharge conditions for the periods of 10 or 15 min. Without fibre specimens were the control group. The provisional resin was same in all groups. All the specimens were subjected to transverse testing with a cross-head speed of 5 mm min-1. The three-point load test was used to record the load of the fracture for each specimens. The Kruskal-Wallis analysis of variance was used to compare the transverse strength, the maximal deflection and the modulus of elasticity. The differences in the transverse strength and the maximal deflection between the six groups were found statistically significant but the modulus of elasticity was not statistically significant. The transverse strength of HEMA-monomer (group A) was shown the highest value (66.3 MPa). For without-fibre group, the value was 52.9 MPa. This difference was statistically significant when the Mann-Whitney U-test was used for comparing. Repairing or remaking provisional restorations can be a time-consuming endeavour. The added strength of the polymethyl methacrylate with the fibre can reduce clinical failures of provisional fixed partial dentures. The surface treatment process was increased the transverse strength and the maximal deflection. The clinical implication of chemical modification agents-coated fibres is reduced incidence of fixed provisional restoration failure.
本研究聚焦于一些力学性能，如用两种不同类型的试剂处理和未处理的玻璃纤维增强树脂以及无纤维树脂的横向强度、最大挠度和弹性模量。使用聚四氟乙烯模具制备六组试样。应用两种不同类型的化学改性剂，即甲基丙烯酸羟乙酯（HEMA）单体和空气气氛，在玻璃纤维上形成亲水表面。流速保持在两个不同水平，25和60 mL min-1。表面处理过程的放电功率为15或20 W。纤维在辉光放电条件下暴露10或15分钟。无纤维试样为对照组。所有组的临时树脂相同。所有试样均以5 mm min-1的十字头速度进行横向测试。采用三点加载试验记录每个试样的断裂载荷。使用Kruskal-Wallis方差分析来比较横向强度、最大挠度和弹性模量。发现六组之间的横向强度和最大挠度差异具有统计学意义，但弹性模量差异无统计学意义。HEMA单体（A组）的横向强度显示出最高值（66.3 MPa）。对于无纤维组，该值为52.9 MPa。当使用Mann-Whitney U检验进行比较时，这种差异具有统计学意义。修复或重新制作临时修复体可能是一项耗时的工作。聚甲基丙烯酸甲酯与纤维增加的强度可减少临时固定局部义齿的临床失败。表面处理过程提高了横向强度和最大挠度。化学改性剂涂覆纤维的临床意义在于降低固定临时修复体失败的发生率。
