Effect of polymerization shrinkage on bond strength between denture base acrylic resin and dental alloy

本研究调查了商业纯钛和Ti-6Al-4V合金板上金钎焊合金的流动面积大小，并确定了界面处的元素组成。在本研究的第二部分中，研究了使用金合金钎焊的钛板的拉伸强度。在牙科红外辐射装置中，将IV型金合金和银钎焊合金的碎片熔化到商业纯钛和Ti-6Al-4V表面上。使用数字图像分析仪测量每种钎焊合金的流动面积。拉伸试样（n=5），也准备了红外钎焊使用的钎焊合金。使用万能试验机对两种钛板和两种钎焊合金的每种组合的五个样本进行拉伸载荷。还对钎焊接头的横截面进行了X射线电子探针显微分析（EPMA），以确定界面上的元素组成，并对断口进行了SEM观察。钎焊合金流动良好，并在Ti和Ti-6Al-4V板上铺展。钎焊合金类型显著影响流动，并且金合金在钛材料上流动较少。使用金钎焊合金钎焊的Ti和Ti-6Al-4V板的平均拉伸强度分别为219 MPa和417 MPa。含金钎料的Ti-6Al-4V试样的断裂表面表现出典型的韧性行为。具有相同钎焊合金的Ti显示脆性表面。在Ti与金钎焊界面处发现更大浓度的Cu。钛合金表面红外钎焊金合金涂层的流动性和抗拉强度满足牙科使用要求。

This study investigated the area size of the flow of a gold braze alloy on commercially pure titanium and Ti-6Al-4V alloy plates, and elemental composition at the interface was determined. In the second part of this study the tensile strengths of titanium plates brazed using a gold alloy were investigated. Chips of Type IV gold alloy and silver braze alloys were melted onto commercially pure titanium and Ti-6Al-4V surfaces in a dental infrared radiation unit. Flow area of each braze alloy was measured using a digital image analyzer. Tensile specimens (n=5) were also prepared by infrared brazing using the braze alloys. Five specimens for each combination of the two titanium plates and the two braze alloys were subjected to tensile loading using a Universal testing machine. Electronprobe microanalysis of x-rays (EPMA) at cross section of the brazed joints to determine elemental composition across the interface, as well as SEM observation at the fracture surfaces, were also conducted. The braze alloys flowed well and spread over the Ti and Ti-6Al-4V plates. Braze alloy type significantly influenced flow, and the gold alloy flowed less on the titanium materials. The mean tensile strengths of Ti and Ti-6Al-4V plates brazed using the gold braze alloy were 219 MPa and 417 MPa, respectively. The fracture surfaces of Ti-6Al-4V specimens with the gold braze alloy exhibited typical ductile behavior. Ti with the same braze alloy showed brittle surfaces. A greater concentration of Cu was found at the Ti with gold braze interface. The flow and the tensile strength of the gold alloy coating on titanium surface by means of an infrared brazing is adequate for dental use.