华西口腔医学杂志 ›› 2020, Vol. 38 ›› Issue (6): 647-651.doi: 10.7518/hxkq.2020.06.007

• 基础研究 • 上一篇    下一篇

二硅酸锂陶瓷和氧化锆髓腔固位冠的面厚度设计对抗折性能的影响

林珍香1(), 潘在兴1, 叶起清1, 郑志强2, 林捷2()   

  1. 1.福建省级机关医院口腔科,福州 350001
    2.福建医科大学附属口腔医院特诊科,福州 350002
  • 收稿日期:2019-12-21 修回日期:2020-02-19 出版日期:2020-12-01 发布日期:2020-12-07
  • 通讯作者: 林捷 E-mail:378467335@qq.com;linjie.dds@gmail.com
  • 作者简介:林珍香,主治医师,硕士,E-mail:378467335@qq.com
  • 基金资助:
    福建省卫计委青年科研项目(2016-1-25);福建省科技创新联合资金项目(2017Y9095)

Effect of occlusal thickness design on the fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia

Lin Zhenxiang1(), Pan Zaixing1, Ye Qiqing1, Zheng Zhiqiang2, Lin Jie2()   

  1. 1. Dept. of Stomatology, Fujian Provincial Governmental Hospital, Fuzhou 350001, China
    2. Dept. of VIP Dental Service, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
  • Received:2019-12-21 Revised:2020-02-19 Online:2020-12-01 Published:2020-12-07
  • Contact: Lin Jie E-mail:378467335@qq.com;linjie.dds@gmail.com
  • Supported by:
    Youth Research Project of Fujian Provincial Health Commission(2016-1-25);Fujian Science and Technology Innovation Joint Fund Project(2017Y9095)

摘要:

目的 探讨二硅酸锂陶瓷和氧化锆制作的下颌第一磨牙髓腔固位冠的面厚度设计对抗折性能的影响。方法 根据修复设计(冠部材料及厚度)的不同,将24个下颌第一磨牙树脂仿真牙随机分成4组,每组6个。二硅酸锂2 mm组:采用二硅酸锂陶瓷制作修复体,面厚度2 mm,固位体长4 mm;二硅酸锂4 mm组:采用二硅酸锂陶瓷制作修复体,面厚度4 mm,固位体长2 mm;氧化锆2 mm组:采用氧化锆制作修复体,面厚度2 mm,固位体长4 mm;氧化锆4 mm组:采用氧化锆制作修复体,面厚度4 mm,固位体长2 mm。使用树脂水门汀粘接系统(RelyX Ultimate Clicker)粘接后,冷热循环10 000次。将万能试验机与牙长轴呈135°,位移速度0.5 mm·min-1,在颊尖加载,测定抗折力及折裂方式,并用SPSS 15.0软件进行方差分析和多重比较。结果 二硅酸锂2 mm组、二硅酸锂4 mm组、氧化锆2 mm组、氧化锆4 mm组的抗折力分别为(890.54±83.41)、(2 320.87±728.57)、(2 258.05±557.66)和(3 847.70±495.99)N。氧化锆4 mm组的抗折力最高,二硅酸锂2 mm组的抗折力最低。结论 磨牙髓腔固位冠使用氧化锆较二硅酸锂陶瓷有更高的抗折力,增加修复体面厚度可提高抗折力,但基牙折裂风险也增加。

关键词: 髓腔固位冠, 抗折性能, 厚度, 固位体, 二硅酸锂陶瓷, 氧化锆

Abstract:

Objective This study aimed to investigate the effect of occlusal thickness design on fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia. Methods A total of 24 artificial first mandibular molars were randomly divided into four groups with six teeth in each group as follows: group lithium disilicate ceramic-2 mm (lithium disilicate ceramic, with an occlusal thickness of 2 mm and a retainer length of 4 mm); group lithium disilicate ceramic-4 mm (lithium disilicate ceramic, with an occlusal thickness of 4 mm and a retainer length of 2 mm); group zirconia-2 mm (zirconia, with an occlusal thickness of 2 mm and a retainer length of 4 mm); and group zirconia-4 mm (zirconia, with an occlusal thickness of 4 mm and a retainer length of 2 mm). After adhesive cementation (RelyX Ultimate Clicker), all specimens were subjected to thermocycling (10 000 cycles). The specimens were subjected to fracture resistance testing at a 135° angle to the teeth at a crosshead speed of 0.5 mm·min-1 in a universal testing machine. Data were analyzed with ANOVA and Tukey’s HSD test by SPSS 15.0. The failure modes were classified. Results The fracture resistances of groups lithium disilicate ceramic-2 mm, lithium disilicate ceramic-4 mm, zirconia-2 mm, and zirconia-4 mm were (890.54±83.41), (2 320.87±728.57),(2 258.05±557.66), and (3 847.70±495.99) N respectively. Group zirconia-4 mm had the highest fracture resistance, whereas group lithium disilicate ceramic-2 mm had the lowest. Conclusion The fracture resistance of molar endocrown with zirconia is higher than that with lithium disilicate ceramic. Increasing the occlusal thickness can improve the fracture resistance but increase the risk of fracture of abutment.

Key words: endocrown, fracture resistance, thickness, retainer, lithium disilicate ceramic, zirconia

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