Roy Anip K, Mohan Dennis, Sunith M, Mandokar Rashmi B, Suprasidh S, Rajan Soumya
Department of Prosthodontics, Purvanchal Institute of Dental Sciences, Gorakhpur, Uttar Pradesh, India, e-mail:
Department of Conservative and Endodontics, Pariyaram Dental College, Kannur, Kerala, India.
J Contemp Dent Pract. 2017 Oct 1;18(10):881-886. doi: 10.5005/jp-journals-10024-2143.
The aim of this study is to compare the shear bond strengths of conventional resin cement and self-adhesive resin cement bonded to lithium disilicate.
A total of 40 extracted human molar teeth were mounted in self-cure acrylic resin. Teeth were prepared to obtain flat occlusal surface. About 40 lithium disilicate specimens of dimension-10 mm in diameter and thickness of 2 mm-were fabricated using lost wax technique. The samples were divided into four groups: Groups I, II, III, and IV (n = 10). The specimens were surface treated with Monobond S silane coupling agent. Self-etching primer and bonding agent were applied on the bonding surface of the teeth in groups I and III. The specimens were bonded to the primed teeth with the Multilink N resin cement and subjected to the universal testing machine. The specimens were light-cured. Specimens in groups II and IV were luted to teeth using self-adhesive cement RelyX U100. The same force was applied over the specimen as mentioned above. Excess cement was removed, and light curing was done. The specimens in groups III and IV were subjected to thermocycling for 10,000 cycles at temperatures altering between 5°C and 55°C.
The shear bond strengths of conventional resin cement and self-adhesive resin cement with lithium disilicate were tested before and after thermocycling. Results indicated that thermocycling has no significant effect on the bond strengths of conventional or self-adhesive resin cement. However, from the study, it is seen that conventional resin cement had a higher shear bond strength value than the self-adhesive resin cement.
There was a significant difference between the average shear bond strength values of conventional resin cement (Multilink N) and self-adhesive resin cement (RelyX U100) when bonded to lithium disilicate disks, and thermocycling had no significant effect on the bond strength of conventional or self-adhesive resin cements.
Among all-ceramic systems available, lithium disilicate materials have emerged as an excellent esthetic material for fabrication of anterior and posterior crowns and three-unit anterior fixed partial dentures because of their high translucency and improved optical properties. For successful clinical outcomes, the luting agent should have high bond strength not only to the ceramic surface, but also to the tooth surface.
本研究旨在比较传统树脂水门汀和自粘接树脂水门汀与二硅酸锂的剪切粘结强度。
将40颗拔除的人磨牙固定在自凝丙烯酸树脂中。制备牙齿以获得平坦的咬合面。使用失蜡法制作约40个直径10mm、厚度2mm的二硅酸锂试件。样本分为四组：第I组、第II组、第III组和第IV组（n = 10）。试件用Monobond S硅烷偶联剂进行表面处理。在第I组和第III组牙齿的粘结面上涂抹自酸蚀底漆和粘结剂。用Multilink N树脂水门汀将试件粘结到涂有底漆的牙齿上，并置于万能试验机上。试件进行光固化。第II组和第IV组的试件使用自粘接水门汀RelyX U100粘结到牙齿上。对试件施加与上述相同的力。去除多余的水门汀并进行光固化。第III组和第IV组的试件在5°C至55°C之间的温度下进行10000次热循环。
在热循环前后测试了传统树脂水门汀和自粘接树脂水门汀与二硅酸锂的剪切粘结强度。结果表明，热循环对传统或自粘接树脂水门汀的粘结强度没有显著影响。然而，从研究中可以看出，传统树脂水门汀的剪切粘结强度值高于自粘接树脂水门汀。
当粘结到二硅酸锂盘时，传统树脂水门汀（Multilink N）和自粘接树脂水门汀（RelyX U100）的平均剪切粘结强度值存在显著差异，并且热循环对传统或自粘接树脂水门汀的粘结强度没有显著影响。
在所有可用的全瓷系统中，二硅酸锂材料因其高透明度和改善的光学性能，已成为制作前牙和后牙冠以及三单位前牙固定局部义齿的优良美学材料。为获得成功的临床效果，粘结剂不仅应与陶瓷表面有高粘结强度，还应与牙齿表面有高粘结强度。
