口腔医学研究

口腔医学研究 ›› 2021, Vol. 37 ›› Issue (2): 139-143.DOI: 10.13701/j.cnki.kqyxyj.2021.02.011

• 儿童口腔医学研究 • 上一篇    下一篇

聚乳酸复合材料及乳前牙根部牙本质的力学性能研究

高黎1*, 王蕊1, 张慧1, 刘文涛2, 马宁2   

  1. 1.郑州大学第一附属医院儿童口腔科 河南 郑州 450000;
    2.郑州大学材料科学与工程学院 河南 郑州 450000
  • 收稿日期:2020-07-27 发布日期:2021-02-11
  • 通讯作者: 高黎,E-mail:gaolidoc@126.com
  • 作者简介:高黎(1973~ ),女,河南人,博士,副主任医师,主要从事儿童口腔龋病及生物学方面的研究。
  • 基金资助:
    河南省自然科学基金(编号:182300410375);河南省高等学校重点科研项目计划(编号:17A320008)

Mechanical Properties of Polylactic Acid Composites and Root Dentin of Primary Anterior Teeth

GAO Li1*, WANG Rui1, ZHANG Hui1, LIU Wentao2, MA Ning2   

  1. 1. Department of Pediatric Dentistry, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China;
    2. School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450000, China
  • Received:2020-07-27 Published:2021-02-11

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摘要： 目的:测试不同比例聚乳酸/羟基磷灰石(PLLA/HA)复合材料及乳前牙根部牙本质的力学性能,为乳前牙根管桩的制作提供参考。方法:熔融共混法制备不同比例的PLLA/HA复合材料,按照HA质量分数不同分为PLLA、PLLA-1%HA、PLLA-3%HA、PLLA-5%HA、PLLA-7%HA共5组,采用电子万能试验机测试其拉伸性能和弯曲性能,摆锤式冲击试验机测试其冲击性能。收集16颗离体乳前牙,测试根部牙本质的压缩模量和压缩强度。结果:组间比较5组PLLA/HA复合材料的弯曲模量和冲击强度无明显差异(P>0.05),而拉伸强度、弯曲强度比较差异有统计学意义(P<0.05),进行组内比较,PLLA-1%HA、PLLA-3%HA、PLLA-5%HA组复合材料的拉伸强度和弯曲强度均较PLLA组有所下降,但3组之间比较差异无统计学意义(P>0.05)。乳前牙根部牙本质压缩模量及压缩强度均数分别为3.63 GPa和128.03 MPa。结论:PLLA-1%HA、PLLA-3%HA、PLLA-5%HA复合材料具有一定的力学性能,有望成为乳前牙根管桩的制作材料,但其力学性能有待进一步提升。

关键词: 聚乳酸, 羟基磷灰石, 根部牙本质, 乳牙根管桩, 力学性能

Abstract: Objective: To test the mechanical properties of different proportions of polylactic acid/hydroxyapatite (PLLA/HA) composites and root dentin of primary anterior teeth. Methods: PLLA/HA composites with different proportions were prepared by melt blending method. PLLA/HA composites were divided into PLLA, PLLA-1%HA, PLLA-3%HA, PLLA-5%HA, and PLLA-7%HA groups according to different HA mass percentages. The tensile and flexural properties were tested by electronic universal tester, and the impact strength of the composites was tested by pendulum impact tester. 16 primary anterior teeth were collected in vitro, and the compressive modulus and strength of root dentin were tested. Results: There was no significant difference in flexural modulus and impact strength among the five groups (P>0.05), but there were significant differences in tensile strength and flexural strength (P<0.05). The tensile strength and flexural strength of PLLA/HA composites in PLLA-1%HA, PLLA-3%HA, and PLLA-5%HA groups were lower than those in PLLA group, but there was no significant difference among three groups (P>0.05). The mean compressive modulus and strength of the root dentin were 3.63 GPa and 128.03 MPa, respectively. Conclusion: PLLA-1%HA, PLLA-3%HA, and PLLA-5%HA composites are expected to be the materials of root canal post in primary teeth due to the certain mechanical properties, but their mechanical properties need to be further improved.

Key words: polylactic acid, hydroxyapatite, root dentin, root canal post of primary teeth, mechanical properties