三种自粘接树脂水门汀抗压强度的对比测定

目的：对比测定三种临床常用的自粘接树脂水门汀的抗压强度.方法：选用SmartCem2、Unicem、MaxcemElite 3种自粘接树脂水门汀,分别制作10个抗压强度试件,每种树脂水门汀试件分2组,每组5个样本,其中1组37℃水浴24h,另外一组试件37℃水浴30d,万能材料试验机测试其抗压强度值,采用SPSS 13.0软件进行统计分析.结果：①水浴24h组：SmartCem2、Unicem、MaxcemElite的抗压强度分别为280.14±16.40MPa、198.84±19.04MPa、346.11±22.17MPa,由高到低排序为MaxcemElite＞ SmartCem2＞ Unicem,组间两两比较均有统计学差异,P＜0.05；②水浴30d组：SmartCem2的抗压强度高于Unicem和MaxcemElite,P＜0.05,而Unicem和MaxcemElite组间比较无显著性差异,P＞0.05；③水浴30d后,SmartCem2的抗压强度值较水浴24h时明显提高,其它两种树脂水门汀抗压强度均降低.结论：与Unicem和MaxcemElite相比,SmartCem2具有较高的抗压强度,并且固化30d较24h的抗压强度值明显升高.

A comparative study on the compressive strength of three kinds of resin cements

Objective： To study the compressive strength of three kinds of self-adhesive resin cements. Methods： Ten specimens were made of three self-adhesive resin cements （SmartCem2, Unicem, MaxcemElite） respectively. Each kind of self-adhesive resin cement was divided into two subgroups with 5 specimens. Specimens in one subgroup were stored in water 37℃ for 24h, and specimens in the other group were stored in water 37℃ for 30d, followed by compressive strength testing with universal testing machine. The data were analyzed with SPSS 13.0 software. Results： In the 24h group, the compressive strength of SmartCem2, Unicem, MaxcemElite were 280.14＋ 16.40MPa, 198.84± 19.04MPa, 346.11 ±22.17MPa, respectively. The range from high to low was MaxcemElite 〉 SmartCem2 〉 Unicem. The comparisons of the compressive strength between any pairwise groups had statistically significant difference, P〈0.05. In the 30d group, the compressive strength of SmartCem2 was higher than that of MaxcemElite or Unicem, P〈0.05. There was no significant difference between MaxcemElite and Unicem, P〉0.05. The compressive strength value of SmartCem2 increased significantly after storing in water for 30d, whereas MaxcemElite and Unicem decreased. Conclusion： Compared with MaxcemElite and Unicem, SmartCem2 was proved to obtain best compressive strength, and have a higher value of compressive strength after curing lbr 30d than that of 24h.