中国组织工程研究 ›› 2024, Vol. 28 ›› Issue (22): 3445-3450.doi: 10.12307/2024.538

• 组织工程口腔材料 tissue-engineered oral materials •    下一篇

不同螺纹种植体修复下颌第一磨牙即刻负荷的初始稳定性比较

李昕茹,赵文博,纪  妍,滕微微,王一茗,周立波   

  1. 佳木斯大学附属口腔医院,黑龙江省口腔生物医学材料及临床应用重点实验室,口腔医学工程实验中心,黑龙江省佳木斯市  154000
  • 收稿日期:2023-10-25 接受日期:2023-11-27 出版日期:2024-08-08 发布日期:2024-01-19
  • 通讯作者: 周立波,主治医师,佳木斯大学附属口腔医院,黑龙江省口腔生物医学材料及临床应用重点实验室,口腔医学工程实验中心,黑龙江省佳木斯市 154000
  • 作者简介:李昕茹,女,1997年生,黑龙江省鹤岗市人,汉族,佳木斯大学在读硕士,执业医师,主要从事数字化口腔种植方向的研究。
  • 基金资助:
    黑龙江省自然科学基金项目(LH2021H108),项目负责人:周立波;黑龙江省普通高等学校青年创新人才培养计划项目(UNPYSCT-2020057),项目负责人:周立波;黑龙江省高等教育教学改革项目(SJGZ20220124),项目负责人:周立波

Comparison of initial stability of mandibular first molar repaired with different threaded implants under immediate loading

Li Xinru, Zhao Wenbo, Ji Yan, Teng Weiwei, Wang Yiming, Zhou Libo   

  1. Affiliated Stomatological Hospital, Jiamusi University, Heilongjiang Key Lab of Oral Biomedicine Materials and Clinical Application, Experimental Center for Stomatology Engineering, Jiamusi 154000, Heilongjiang Province, China
  • Received:2023-10-25 Accepted:2023-11-27 Online:2024-08-08 Published:2024-01-19
  • Contact: Zhou Libo, Attending physician, Affiliated Stomatological Hospital, Jiamusi University, Heilongjiang Key Lab of Oral Biomedicine Materials and Clinical Application, Experimental Center for Stomatology Engineering, Jiamusi 154000, Heilongjiang Province, China
  • About author:Li Xinru, Master candidate, Physician, Affiliated Stomatological Hospital, Jiamusi University, Heilongjiang Key Lab of Oral Biomedicine Materials and Clinical Application, Experimental Center for Stomatology Engineering, Jiamusi 154000, Heilongjiang Province, China
  • Supported by:
    Natural Science Foundation Project of Heilongjiang Province, No. LH2021H108 (to ZLB); Training Program for Young Innovative Talents in General Higher Education Institution of Heilongjiang Province, No. UNPYSCT-2020057 (to ZLB); Heilongjiang Province Higher Education Teaching Reform Project, No. SJGZ20220124 (to ZLB)

摘要:


文题释义:

即刻种植即刻负荷:牙拔除同期植入修复体并于1周之内戴入临时修复体,修复体与对颌存在功能性牙合接触。
初始稳定性:种植体植入种植窝之后与种植窝骨壁机械啮合(初始骨接触)所获得的种植体稳定性,随着时间的推移和骨改建的发生,种植体的初始稳定性逐渐降低、继发稳定性逐渐升高。


背景:螺纹结构的锥形种植体具有良好控制微动的能力,有利于即刻负荷,但有关双螺纹锥柱状和锥形柱状锥形种植体对即刻负荷后种植体-骨界面应力分布和初始稳定性的影响尚未见文献报道。

目的:探讨双螺纹锥柱状和锥形柱状种植体在下颌磨牙区即刻负荷时对种植体及周围骨界面生物力学分布的影响。
方法:①三维有限元分析:利用锥形束CT扫描1名志愿者下颌骨及第一磨牙,建立下颌骨基准模型,将双螺纹锥柱状和锥形柱状种植体分别与下颌骨模型组装,建立下颌第一磨牙即刻种植(或延期种植)即刻负荷种植体模型(共4组模型),对每个模型牙冠中央窝处分别加载轴向、舌颊45°向、近远中向、颊舌4个方向的载荷(100 N),利用三维有限元分析种植体位移和种植体-骨界面应力分布情况。②体外实验:在口腔种植机器人的辅助下,将双螺纹锥柱状和锥形柱状种植体分别植入相同的人工骨块上,建立种植体即刻种植(或延期种植)即刻负荷体外模型(共4组模型),用Osstell共振频率分析仪及配套的SmartPeg传感器测量前、后、左、右4个垂直方向的种植体稳定系数值,评估其初始稳定性,验证有限元分析结果。

结果与结论:①延期种植即刻负荷时,锥形柱状种植体和双螺纹锥柱状种植体的位移相差较小,但锥形柱状种植体-骨界面最大应力值大于双螺纹锥柱状种植体-骨界面;即刻种植即刻负荷时,种植体周围骨的最大应力值和最大位移量均出现在近远中向施加载荷时,其中锥形柱状种植体应力值达到了298.84 MPa,最大位移量为0.31 mm,均大于双螺纹锥柱状种植体;②体外实验结果显示,双螺纹锥柱状种植体的种植体稳定系数值均大于锥形柱状种植体;③与锥形柱状种植体相比,双螺纹锥柱状种植体在即刻负荷时具有较高的初始稳定性,提示临床上即刻负荷时可优先考虑使用双螺纹锥柱状种植体。

https://orcid.org/0009-0000-9663-3088(李昕茹)

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料口腔生物材料纳米材料缓释材料材料相容性组织工程

关键词: 种植修复, 种植体, 即刻负荷, 螺纹设计, 三维有限元分析, 初始稳定性

Abstract: BACKGROUND: The threaded conical implant has a good ability to control micro movements and is conducive to immediate loading. However, the effects of double-threaded conical cylindrical implants and conical cylindrical implants on stress distribution and initial stability of implant-bone interface after immediate loading have not been reported.
OBJECTIVE: To investigate the impact of double-threaded conical cylindrical implants and conical cylindrical implants on the biological distribution of the implant and the surrounding bone interface during immediate loading in the mandibular molar region. 
METHODS: (1) Three-dimensional finite element analysis: Conical beam CT scans of the mandible and first molar of a volunteer were used to develop a basal model of the mandible. The double-threaded conical cylindrical implants and conical cylindrical implants were assembled with the mandibular models, and an immediate-load (or delayed implantation) implant model (a total of four models) for the first mandibular molar was established. Loads in four directions (100 N): axial, lingual and buccal 45°, mesial and distal, and buccal and lingual, were applied to the central fossa of each model’s crown. Three-dimensional finite element method was used to analyze the implant displacement and the stress distribution at the implant-bone interface. (2) In vitro experiment: With the assistance of the oral implant robot, the double-threaded conical cylindrical implants and conical cylindrical implants were implanted on the same artificial bone pieces, separately, and the immediate load model of immediate implant implantation (or delayed implantation) was established in vitro (a total of four groups of models). Osstell resonance frequency analyzer and SmartPeg sensor were used to measure the implant stability coefficient in four vertical directions: front, rear, left, and right measurements, evaluate the initial stability, and verify the finite element analysis results.
RESULTS AND CONCLUSION: (1) The displacement difference between double-threaded conical cylindrical implants and conical cylindrical implants was small when the immediate loading of delayed implantation was applied, but the maximum stress value of conical cylindrical implant-bone interface was greater than that of double-threaded conical cylindrical implant-bone interface. When the immediate loading of immediate implantation was applied, the maximum stress value and the maximum displacement of bone around the implant appeared when the load was applied in mesiodistal direction. The stress value of the conical cylindrical implant reached 298.84 MPa and the maximum displacement was 0.31 mm, both of which were larger than that of the double-threaded conical cylindrical implant. (2) The results of in vitro experiments showed that the stability coefficient of the double-threaded conical cylindrical implant was greater than that of the conical cylindrical implant. (3) Compared with the conical cylindrical implant, the double-threaded conical cylindrical implant has higher initial stability under immediate loading, suggesting that the use of double-threaded conical cylindrical implant should be given priority in clinical immediate loading.

Key words: implant restoration, implant, immediate loading, threaded design, three-dimensional finite element analysis, initial stability

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