Ohkubo C, Watanabe I, Hosoi T, Okabe T
Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, Texas 75246, USA.
J Prosthet Dent. 2000 Jan;83(1):50-7. doi: 10.1016/s0022-3913(00)70088-6.
Poor chemical bonding of a denture base resin to cast titanium frameworks often introduces adhesive failure and increases microleakage.
This study examined the shear bond strengths of a denture base resin to cast pure titanium, Ti-6Al-4V, and a cobalt-chromium alloy using various adhesive primers.
Disks (6.0 mm diameter, 2.5 mm thick) were cast of the 3 alloys. The disk surfaces were grit-blasted with 50 microm alumina and treated with 5 different metal primers (Metal Primer II ¿MP]; Cesead Opaque primer ¿OP]; Meta Base ¿MB]; experimental primer ¿EP]; Siloc bonding system ¿SI]). A denture base resin (Palapress Vario) was then applied on the disks with hole-punched sticky tape (bonding area of 5.0 mm) and a Teflon (PTFE, New Age Industries Inc, Willow Grove, Pa.) ring (6.0 mm diameter x 2.0 mm thick). Specimens without primer were also prepared as controls. All specimens were immersed in 37 degrees C water and thermocycled up to 2,000 cycles. Shear bond strength values were determined at a crosshead speed of 0.5 mm/min. Data were statistically analyzed using 3-way ANOVA, followed by 1-way ANOVA and the Scheffé multiple range test.
Primers significantly (P <.05) improved shear bond strengths of denture base resin to all metals, among which no significant differences were found. Specimens primed with OP, MP, and EP showed higher bond strengths than did those primed with MB. After thermocycling, the bond strengths of MB and SI decreased substantially; MB showed the least durability (22.8% to 35.5% decrease) among the primers.
The application of 5 primers significantly improved the shear bond strengths of a denture base resin to cast CP titanium, Ti-6Al-4V, and Co-Cr alloy. OP and MP primers exhibited greater bond strength and durability than did MB and SI.
义齿基托树脂与铸造钛支架之间的化学键合不佳常常会导致粘接失败并增加微渗漏。
本研究使用各种粘接底漆检测义齿基托树脂与铸造纯钛、Ti-6Al-4V以及钴铬合金之间的剪切粘接强度。
用这三种合金铸造圆盘（直径6.0毫米，厚2.5毫米）。圆盘表面用50微米的氧化铝进行喷砂处理，并用5种不同的金属底漆（金属底漆II [MP]；Cesead不透明底漆[OP]；Meta Base [MB]；实验底漆[EP]；Siloc粘接系统[SI]）进行处理。然后用打孔胶带（粘接面积5.0毫米）和特氟龙（聚四氟乙烯，新时代工业公司，宾夕法尼亚州威洛格罗夫）环（直径6.0毫米×厚2.0毫米）将义齿基托树脂（Palapress Vario）涂覆在圆盘上。未使用底漆的标本也作为对照制备。所有标本均浸泡在37摄氏度的水中，并进行多达2000次循环的热循环处理。以0.5毫米/分钟的十字头速度测定剪切粘接强度值。数据采用三因素方差分析进行统计学分析，随后进行单因素方差分析和谢费多重极差检验。
底漆显著（P <.05）提高了义齿基托树脂与所有金属之间的剪切粘接强度，其中未发现显著差异。用OP、MP和EP处理的标本显示出比用MB处理的标本更高的粘接强度。热循环后，MB和SI的粘接强度大幅下降；MB在底漆中显示出最低的耐久性（下降22.8%至35.5%）。
5种底漆的应用显著提高了义齿基托树脂与铸造纯钛、Ti-6Al-4V和钴铬合金之间的剪切粘接强度。OP和MP底漆表现出比MB和SI更大的粘接强度和耐久性。
