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目的:评价不同核材料修复后的牙齿经铸造金属全冠修复后边缘微渗漏的情况。方法:将90个大小相似的完好前磨牙,随机分为9个实验组。对离体牙进行铸造金属全冠及固定尺寸的Ⅱ类洞牙体预备后,分别用3种不同的核材料(树脂、银汞合金、铸造合金)充填窝洞。常规方法铸造镍铬合金全冠,用3种不同的粘结材料(聚羧酸锌、玻璃离子、树脂C&B)进行粘固。温度循环、染色、包埋后,标本片切,镜下观察冠边缘及核下微漏情况。结果:银汞核与树脂核下微漏小于铸造核(P<0.05),树脂粘结剂抗微漏性能优于聚羧酸锌水门汀和玻璃离子粘结剂(P<0.05)。结论:树脂粘接剂抗微漏性能优于玻璃离子与聚羧酸锌粘结剂。树脂核在预先对粘结面处理后,其抗微漏性能与银汞核近似,优于铸造合金核。
OBJECTIVE: To evaluate the marginal microleakage of teeth restored by cast metal crowns with different nuclear materials. Methods: 90 intact premolar teeth of similar size were randomly divided into 9 experimental groups. Casting metal crowns and fixed-size Class II coccoid teeth were prepared from the isolated teeth, and the holes were filled with three different core materials (resin, amalgam, cast alloy). Conventional method cast nickel-chromium alloy crown, with three different bonding materials (zinc polycarboxylate, glass ion, resin C & B) for cementing. Temperature cycling, staining, embedding, the specimen cut, under the microscope to observe the edge of the crown and the micro-leak situation. Results: The microleakage of silver-mercury core and resin core was smaller than that of cast core (P <0.05). The anti-microleakage of resin binder was better than that of zinc carboxylate cement and glass ionomer binder (P <0.05). Conclusion: The anti-microleakage of resin adhesive is better than glass ionomer and zinc carboxylate binder. Resin core in pre-bonding surface treatment, its anti-micro-leakage performance and silver mercury core approximation, better than cast alloy core.