| 程侠,张修银,钱文昊.不同垫底材料对髓腔固位冠抗折强度影响的相关力学分析[J].口腔材料器械杂志,2023,32(1):26-31. |
| 不同垫底材料对髓腔固位冠抗折强度影响的相关力学分析 |
| Mechanical analysis of the fracture resistance of endocrown with different base materials |
| 投稿时间：2022-01-22 修订日期：2022-06-21 |
| DOI：10.11752/j.kqcl.2023.01.05 |
| 中文关键词: 髓腔固位冠 垫底材料 抗折强度 |
| 英文关键词:Endocrown Base material Fracture resistance |
| 基金项目:上海市医学重点学科（编号：ZK2019B12）；上海市徐汇区医学尖峰学科（编号：SHXH201706）；上海市徐汇区医学科研项目（编号：SHXH201841） |
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| 中文摘要: |
| 目的 研究经不同垫底材料行根管治疗后的上颌前磨牙，在全瓷髓腔固位冠修复后的抗折强度，为临床髓腔固位冠修复时垫底材料的选择提供理论参考。方法 收集30颗离体上颌第一前磨牙，进行根管治疗和牙体预备，根据垫底材料的不同随机分为复合树脂组、流体树脂组及玻璃离子组（n=10），采用CAD-CAM技术制作全瓷髓腔固位冠，对样本进行5000个周期冷热循环（5℃及55℃，各30 s）。随后用万能测试仪进行抗折强度的测试，记录折裂负荷值及折裂模式并对结果进行统计学分析。结果 复合树脂组、流体树脂组及玻璃离子组的折裂负荷值分别是（713.87±205.59） N、（777.70±229.48） N及（725.48±214.58） N，3组间的差异无统计学意义（P=0.784）；各组试件的折裂模式以可修复性为主。结论 髓腔固位冠修复后整体强度受垫底材料的影响较小，但临床可选用流动性及封闭性较好的材料（如流体树脂）。 |
| 英文摘要: |
| Objective This study aimed to analyze the fracture resistance of the all-ceramic endocrown with different base materials for maxillary premolars after root canal therapy, to provide a theoretical reference for the selection of base materials for pulp retention crowns in clinical. Methods Thirty maxillary premolars were collected, assigned into three groups(n=10):nanocomposite resin group (A), fluid resin group (B) and glass ion group (C). All specimens were endodontically treated and receired abutment preparation, and restored by all-ceramic endocrowns by using the CAD-CAM technique. All specimens were subjected to 5000 cold-hot cycles(5-55℃, 30s per temperature) and then received a compressive load until fracture occurred by using universaltester. The fracture resistances and patterns were recorded and the data was analyzed. Results The mean fracture resistance of nanocomposite resin group, fluid resin group, glass ion group were recorded as follows:713.87±205.59 N、777.70±229.48 N、725.48±214.58 N. There was no significant difference observed in the three groups(P=0.784). Most specimens exhibited the pattern of recoverable fracture. Conclusion The choice of base material exerts little effect on the overall strength, while the base materials with good mobility and sealing ability (such as fluid resin) are recommended to be selected in clinical practice. |
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