上海口腔医学

上海口腔医学 ›› 2021, Vol. 30 ›› Issue (1): 7-12.doi: 10.19439/j.sjos.2021.01.002

• 论著 • 上一篇    下一篇

2种椅旁CAD/CAM修复材料冠抗折强度的体外研究

林晨官璐, 胡小坤, 严雨欣, 曲延慧, 刘梅*, 章非敏*   

  1. 南京医科大学 口腔疾病研究江苏省重点实验室, 南京医科大学附属口腔医院 修复科,江苏 南京 210029
  • 收稿日期:2019-10-14 修回日期:2020-01-10 出版日期:2021-02-25 发布日期:2021-04-02
  • 通讯作者: 刘梅,E-mail：liumei2017@njmu.edu.cn;章非敏,E-mail: fmzhang@njmu.edu.cn。*共同通信作者
  • 作者简介:林晨官璐（1992-）,女,硕士研究生, 住院医师,E-mail:linchenguanlu@163.com
  • 基金资助:
    国家自然科学基金（81701025）; 江苏省卫计委科研课题（Q201604）; 江苏省高校优势学科建设工程资助项目（2018-87）

Comparison of fracture strength of two chairside CAD/CAM ceramic blocs with different thickness

LIN Chen-guan-lu, HU Xiao-kun, YAN Yu-xin, QU Yan-hui, LIU Mei, ZHANG Fei-min   

  1. Jiangsu Key Laboratory of Oral Disease, Nanjing Medical University, Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University. Nanjing 210029, Jiangsu Provinces, China
  • Received:2019-10-14 Revised:2020-01-10 Online:2021-02-25 Published:2021-04-02

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摘要： 目的:比较2种椅旁CAD/CAM即刻修复材料（IPS e.max CAD和Vita Enamic）体外不同面厚度下冠抗折强度的差异,为临床CAD/CAM修复体的制作提供参考。方法:定制树脂全冠预备体代型42个,以面预备量1.5、2.0、2.5 mm随机分为3组,CEREC扫描代型,储存数据,分别利用IPS e.max CAD和Vita Enamic 2种材料CAD/CAM切削不同厚度的全冠修复体,利用可乐丽菲露SAC树脂粘接剂粘结,完全固化后水浴24 h。万能实验机测试其静载荷下的断裂强度值,扫描电镜下观察断口形貌,能谱（EDS）分析化学成分,X射线衍射法（XRD）分析2种材料的成分差异,用SPSS 20.0软件包对数据进行统计学分析。结果:随着面厚度增加,IPS e.max CAD的断裂强度值明显增加,而Vita Enamic组变化无统计学差异。在1.5~2.0 mm间,IPS e.max CAD组和Vita Enamic组断裂强度值无统计学差异;在2.0~2.5 mm间,IPS e.max CAD组断裂强度值显著高于Vita Enamic组。扫描电镜结果显示,IPS e.max CAD填料颗粒较小,主要出现锥状裂纹。随着厚度增加,锥状裂纹由集中表现转变为散在模式分布于断面。Vita Enamic填料颗粒较大,表现为放射状裂纹;随着厚度增加断面呈现大面积弥散性损伤。EDS结果显示,Vita Enamic中的金属氧化物和SiO2含量显著高于IPS e.max CAD。XRD显示,IPS e.max CAD的主晶相为硅酸锂,而Vita Enamic为非晶相材料。结论:IPS e.max CAD和Vita Enamic在面厚度大于1.5 mm时,均可满足临床应用条件。当面厚度大于2.0 mm时,IPS e.max CAD表现出更佳的抗折裂性能。

关键词: 椅旁CAD/CAM, 全瓷修复体, 厚度, 断裂强度

Abstract: PURPOSE: To provide theoretical basis for clinical CAD/CAM restorations with a comparison of the fracture strength between two chairside CAD/CAM immediate restorative materials (IPS e.max CAD and Vita Enamic) with different occlusal thickness in vitro. METHODS: IPS e.max CAD and Vita Enamic full-crowns with occlusal thicknesses 1.5/2.0/2.5 mm were fabricated with CEREC and adhesively seated to dies customized by manufacturer (n=42). All specimens were stored in distilled water at 37 ℃ for 24 h. Later, static fractural loading was performed. The fracture surface was observed through scanning electron microscope (SEM) and energy dispersive spectrum (EDS). The composites of two materials were detected by X-Ray diffraction (XRD) techniques. The results of fracture strength were analyzed by one-way ANOVA and t-test via SPSS 20.0 software package. RESULTS: With the increase of occlusal thickness, the fracture strength of IPS e.max CAD increased remarkably. However, the Vita Enamic's fracture strength remained the same with no significant difference. With the occlusal thickness increased from 1.5 to 2.0 mm, there was no significant difference in the fracture strength between IPS e.max CAD group and Vita Enamic group. As the thickness increased from 1.5 to 2.0 mm, the fracture strength of IPS e.max CAD group was significantly higher than that of Vita Enamic group. The results of SEM showed that the filler particles of IPS e.max CAD were smaller compared to that of Vita Enamic. Cone cracks were mainly found in the fracture surface of IPS e.max CAD, while radical cracks appeared in Vita Enamic. EDS showed the metal oxide and SiO2 in Vita Enmic was significantly higher than that in IPS e.max CAD. XRD showed that the primary crystal phase of IPS e.max CAD was lithium silicate, while Vita Enamic was amorphous. CONCLUSIONS: Both IPS e.max CAD and Vita Enamic can meet the standard of clinical application as the occlusal thickness reaches 1.5 mm. IPS e.max CAD showed better fracture resistance when the thickness was greater than 2.0 mm.

Key words: Chairside CAD/CAM, All-ceramic restoration, Thickness, Fracture strength

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