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- 2017
3种桩核系统全瓷冠边缘和内部适合性比较的实验研究
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Abstract:
摘要 目的:研究遮色钴铬合金桩核、氧化锆桩核、纤维桩树脂核三种牙色桩核系统氧化锆全瓷冠修复后冠边缘和内部适合性的差异,为临床桩核全瓷冠修复方法和材料的选择提供参考依据。方法:24颗离体上颌中切牙在釉牙骨质界冠方2.0 mm处截冠,按临床操作程序和方法分别制作遮色钴铬合金桩核、氧化锆桩核、纤维桩树脂核各8个,均加二氧化锆全瓷冠修复。在100倍体视显微镜下,采用间隙印模测量法比较3组冠的边缘和内部间隙大小,应用SPSS 17.0软件对实验数据进行统计分析。结果:遮色钴铬合金桩核组、氧化锆桩核组、纤维桩树脂核组锆瓷冠的边缘间隙测量结果分别为(96.98±3.51)、(62.34±3.22)、(59.00±3.96) μm。内部间隙为(95.71±2.52)、(73.14±2.04)、(68.52±4.08)μm。遮色钴铬合金桩核组的边缘间隙及内部间隙与氧化锆桩核组、纤维桩树脂核组间差异均有统计学意义(P<0.05),氧化锆桩核组与纤维桩树脂核组之间边缘及内部间隙差异均无统计学意义。结论:3种桩核方法上制作的氧化锆全瓷冠边缘适合性均在临床可接受范围内,但采用氧化锆桩核、纤维桩树脂核制得的全瓷冠其边缘适合性更接近美国牙科协会标准,更值得推广应用
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