全酸蚀粘结系统与自粘结系统玻璃纤维桩核修复抗剪切强度的对比研究

目的研究全酸蚀粘结系统与自粘结系统玻璃纤维桩的剪切粘结强度,为临床合理选择纤维桩及修复材料提供依据。方法选取因牙周病或因正畸减数拔除的无龋、无裂纹前磨牙30颗,随机分为A、B两组,每组15颗。A组用全酸蚀粘结系统,用LuxaBond-Total Etch粘结剂和LuxaCore Z-Dual树脂粘结直径1.25 mm的Lux-aPost玻璃纤维桩于离体牙根管内。B组用自粘结系统,用RelyX Unicem树脂水门汀粘结直径1.30 mm RelyX Fi-ber Post玻璃纤维桩于离体牙根管内。冠部保留5 mm纤维桩,堆厚6 mm的树脂核制备成样本。用万能力学试验机进行剪切粘结强度测试。独立样本t检验比较两组的抗剪切强度。结果两组断裂方式不同,A组为纤维桩沿树脂与牙体交接处断裂,纤维桩未有松动或脱落;B组为桩核树脂沿树脂与牙体交接处脱落,纤维桩未有断裂。A组抗剪切强度为(393.06±168.38)N,B组抗剪切强度为(222.23±108.76)N,差异有统计学意义(P=0.004)。结论采用全酸蚀粘结系统与自粘结系统,玻璃纤维桩在根管内剪切粘结强度的差异显著,全酸蚀粘结系统优于自粘结系统。使用全酸蚀粘结系统,纤维桩与树脂结合优于自粘结系统。

High Yield Cultivation Techniques of Two Fine Walnut Varieties, Qingxiang and Liaohe 1

Since the introduction of Qingxiang and Liaohe 1 in 2012, both varieties have shown characteristics of beautiful nuts appearance, high quality and high yield of nuts, strong disease resistance after six years regional varieties. Comparison shows that Qingxiang has strong tree vigor, making it suitable for loose planting, needs pollination tree, bears food late and shows very stable yield performance, while Liaohe 1 has medium tree vigor, bears food early and shows stable yield performance. Based on years of regional planting tests, suggestions were proposed to the high yield cultivation techniques of walnut.