种植义齿粘结界面和骨结合界面在冲击力下的应力及变形分析

发布时间：2018-03-20 03:12

本文选题：种植义齿　切入点：有限元分析　出处：《北方工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：人体口腔环境复杂,种植义齿经过长期使用之后容易出现绷瓷等病变,在利用去冠器取下牙冠进行二次治疗的过程中容易对粘结面和骨结合面造成损伤破坏,不同的粘结修复材料、不同的粘结层厚度以及不同的拆卸牙冠作用点都会影响拆卸的效果。目前临床上对种植系统中牙冠的拆卸更多的是依靠经验,缺乏理论性研究的指导,因此研究种植义齿粘结界面和骨结合界面在去冠器冲击载荷作用下的应力和变形的分布及峰值大小,从而在种植修复中合理选择粘结材料、粘结层厚度以及在拆卸牙冠时选择恰当的拆卸作用点,具有一定的理论指导意义。通过建立了种植义齿有限元模型,并针对聚羧酸锌水门汀、玻璃离子水门汀、磷酸锌水门汀三种粘结材料以及牙冠上4个不同的载荷作用点,设计了12种工况,利用Workbench中的瞬态动力学模块进行仿真计算,得到了粘结界面和骨结合界面的应力和变形的分布以及峰值的大小。结果表明：应力和变形的分布趋势与粘结材料关系不大,粘结界面的变形主要分布在粘结剂和基台接触的顶端一圈的位置,骨结合面的变形主要分布在种植体与骨密质接触的颈部区域；在牙冠颊侧的两个不同位置施加冲击载荷时,粘结剂颈部肩台颊侧位置和骨密质与种植体形成骨结合界面的颊侧螺纹接触位置有应力集中现象,为失效风险较大的区域；在牙冠舌侧的两个不同位置施加冲击载荷时,粘结剂颈部肩台舌侧位置和骨密质与种植体形成骨结合界面的舌侧螺纹接触位置有应力集中现象,为失效风险较大的区域。通过比较应力和变形峰值的大小可以得出：在牙冠4个位置施加载荷时,粘结剂上的最大拉应力都大于相应材料的抗拉强度；在牙冠颈部舌侧位置施加冲击载荷时,对基台粘结面和骨结合面的损伤风险最低；磷酸锌水门汀为粘结材料时基台粘结面上产生的应力为27.522MPa,比玻璃离子水门汀和聚羧酸锌水门汀作为粘结材料时在基台粘结面上产生的应力分别高9.6%和14.8%,引起损伤的风险稍高。基于参数化的种植义齿模型,利用Workbench中的Design Exploration模块分析了粘结层厚度在20μm-150μm范围内连续变化时对粘结界面和骨结合界面造成的影响。结果表明：粘结层厚度对粘结界面的变形峰值以及骨结合面的应力与变形峰值影响很小；在粘结层厚度为50pμm-53μm时,基台粘结面损伤风险最低,同时在冲击载荷作用下牙冠能够正常脱位。通过以上的仿真研究结果可以为种植义齿的临床修复治疗提供参考。
[Abstract]:Human oral cavity environment is complex, implant denture after long-term use is prone to the appearance of porcelain and other pathological changes, in the use of crown remover to remove the crown for secondary treatment of the process is easy to cause damage to the bonding surface and bone bonding surface damage. Different bonding materials, different thickness of bonding layer and different application points of disassembly crown will affect the effect of disassembly. At present, the clinical application of dental crown removal in implant system is more dependent on experience, lack of theoretical research guidance. Therefore, the distribution and peak value of stress and deformation of implant denture bonding interface and bone-bonding interface under impact loading of crown remover were studied, so as to reasonably select bonding materials in implant restoration. The thickness of the adhesive layer and the selection of appropriate disassembly point in the removal of the crown are of theoretical significance. The finite element model of implant denture was established, and 12 working conditions were designed for three kinds of bonding materials, such as polycarboxylate zinc cement, glass ionomer cement and zinc phosphate cement, as well as four different loading points on the crown. By using the transient dynamics module in Workbench, the distribution of stress and deformation and the magnitude of peak value of stress and deformation at bonding interface and bone-bonded interface are obtained. The results show that the distribution trend of stress and deformation is not related to the bonding material. The deformation of the bonding interface was mainly located at the top circle of the contact between the binder and the base, the deformation of the bony joint was mainly distributed in the neck region where the implant was in contact with the dense bone, and when the impact load was applied at two different positions on the buccal side of the crown, At the buccal side of the shoulder abutment of the neck of the binder and the contact position of the bone-dense substance at the buccal side where the implants form a bone-bound interface, there is a stress concentration phenomenon, which is an area with a high risk of failure. When the impact load is applied at two different positions of the crown and tongue side, The stress concentration in the position of the lingual side of the shoulder plate of the binder and the contact position of the bony compaction with the bony thread formed the bone-bound interface between the implants and the implant is a high risk area for failure. By comparing the peak values of stress and deformation, it can be concluded that the maximum tensile stress on the binder is greater than the tensile strength of the corresponding material when applied at the four positions of the crown, and when the impact load is applied on the lingual side of the crown neck, the maximum tensile stress on the binder is greater than the tensile strength of the corresponding material. The damage risk of bond surface and bone joint surface of the base platform was the lowest. When zinc phosphate cement is the bonding material, the stress on the bonding surface is 27.522 MPa, which is 9.6% and 14.8 times higher than that of glass ionomer cement and polycarboxylate zinc cement on the bonding surface of the base, respectively. The risk of damage is slightly higher than that of glass ionomer cement and polycarboxylate zinc cement. Based on parameterized implant denture model, By using the Design Exploration module in Workbench, the influence of the thickness of the bond layer on the bond interface and the bone-bonding interface is analyzed when the thickness of the bond layer changes continuously in the range of 20 渭 m to 150 渭 m. The results show that the thickness of the bond layer affects the peak deformation of the bond interface and the bone interface. The peak value of stress and deformation has little effect; When the thickness of the bonding layer is 50p 渭 m -53 渭 m, the damage risk of the base surface is the lowest, and the crown can dislocate normally under the impact load. The above results can provide reference for the clinical treatment of implant denture.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783.6

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