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牙应力分析

牙应力分析的相关文献在1989年到2022年内共计112篇,主要集中在口腔科学、基础医学、临床医学 等领域,其中期刊论文112篇、专利文献248906篇;相关期刊37种,包括中国生物医学工程学报、口腔颌面修复学杂志、中华口腔正畸学杂志等; 牙应力分析的相关文献由344位作者贡献,包括王焱、刘洪臣、米乃元等。

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论文:112 占比:0.04%

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论文:248906 占比:99.96%

总计:249018篇

牙应力分析—发文趋势图

牙应力分析

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  • 王焱
  • 刘洪臣
  • 米乃元
  • 张少锋
  • 张新春
  • 程祥荣
  • 马轩祥
  • 李湘霞
  • 樊瑜波
  • 王延荣
  • 期刊论文
  • 专利文献

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    • 王岚(综述); 秦思琪; 陈思宇; 高志(审校)
    • 摘要: 种植义齿修复牙列缺损是目前最常见的口腔治疗方式之一,但仍存在因咬合力过载、骨应力集中导致的种植修复失败问题。三维有限元分析是研究口腔生物力学的一种新颖且直观高效的方法,可以模拟不同载荷对种植体和周围组织的影响,已在种植修复体研究中得到了广泛应用,用以优化种植手术的设计方案。三维有限元分析相较于其他传统力学分析方法的优势在于其可以通过精确的建模和算法,分析描述具有复杂几何形状的种植修复义齿在咬合力下的生物力学行为。该文将对近年来三维有限元法在口腔种植修复学中的研究现状进行综述。
    • 于文倩; 李晓茜; 陈思艺; 马晓妮; 徐欣
    • 摘要: 目的 通过三维有限元方法探讨上部结构材料对无牙下颌种植固定修复生物力学的影响,为无牙颌修复治疗提供参考.方法 构建无牙下颌种植固定修复三维有限元模型,用6种牙科材料(纯钛、钴铬合金、金合金、氧化锆、聚醚醚酮及碳纤维增强聚醚醚酮)分别对种植上部结构进行赋值,得到6种模型,模拟斜向加载,对种植体、周围骨组织及上部结构进行应力分析.结果 无论采用何种材料,斜向加载下模型应力均集中于后牙区种植体远中颊侧颈部及周围骨皮质,骨松质受力远小于骨皮质.6种模型种植体及骨皮质的应力由小到大分别为氧化锆、钴铬合金、纯钛、金合金、碳纤维增强聚醚醚酮、聚醚醚酮.聚醚醚酮模型磨牙区种植体及骨皮质von Mises应力最大值分别为44.96和29.13 MPa;氧化锆模型磨牙区种植体及骨皮质的von Mises应力最大值分别为21.29和17.79 MPa.与聚醚醚酮模型相比,氧化锆和金属模型种植体及周围骨皮质的应力值更小,且应力分布更均匀.结论 无牙下颌种植固定修复中使用氧化锆和金属等非聚合物材料制作上部结构,更有利于种植体及周围骨组织的应力分散.
    • 冯广智1; 付宏宇2; 马鹏华3
    • 摘要: 背景:如何最大限度地保留根管治疗后的牙体组织,并能够保证修复后的强度是目前的研究热点。目的:使用有限元法分析不同方式修复离体牙缺损模型的应力分布情况。方法:收集北京市海淀医院口腔科因慢性牙周炎无法保留而拔除的上颌第一磨牙12颗,根管治疗后制备离体牙缺损模型,以钴铬合金、纯钛金属、二氧化锆、E.max全瓷为修复材料,每种材料分别进行嵌体、高嵌体、桩核冠3种修复方式。通过MicroCT扫描上颌第一磨牙修复模型,使用图像处理软件Mimics17.0及GeomegicStudio2013重建牙体及修复体三维数字模型,采用有限元分析软件进行力学模拟,力加载方式设为:8点90°加载、3点90°加载、3点90°加载、3点0°加载。结果与结论:在各载荷条件下,桩冠组修复体边缘、预备体肩台、剩余牙本质颈部及桩核中部出现应力集中区;在各载荷条件下,嵌体组釉质的加载点出现应力集中区,并有将应力沿牙釉质传到至颈部的趋势,嵌体和预备体相对的龈壁和底面及二者移行处也出现应力集中区;在各载荷条件下,高嵌体组高嵌体与牙釉质接触处出现应力集中,预备体龈壁和底面及二者移行处,以及相对应的高嵌体髓腔内部分也出现应力集中的情况,但应力分布更为均匀;结果表明在上颌磨牙大面积缺损的修复方式中,高嵌体具有适用性和优势性。
    • He Yutong; Ma Chunli; Qiao Geng; Liu Jiayi; Wang Yuan; Song Jun; Liu Yi; Wang Zhenhua
    • 摘要: 目的 比较下颌中切牙种植单端固定桥桥体与邻牙接触面形状对种植体、骨组织应力分布及修复体位移的影响.方法 采用CT扫描获取健康成人下颌骨及牙列影像数据,建立下颌中切牙种植体单端固定桥修复的三维有限元模型,其中与桥体接触的邻近天然牙的接触面分别设计为椭圆形和梯形(唇侧底边略小而舌侧底边略大).在桥体41长轴中线切缘处加载120 N载荷,方向分别设定为平行于牙体长轴且向下的0°角,颊侧至舌侧并向下与牙体长轴分别呈30°、45°、60°角,垂直于牙体长轴且向舌侧的90°角.比较两种模型种植体、周围骨组织的应力分布情况以及修复体的位移变化.结果 在相同条件加载下,与椭圆形接触面模型相比,梯形接触面模型种植体及周围骨组织的最大等效应力和修复体的最大位移均较小,且应力分布更均匀,应力集中范围更小,随着加载角度的增加,此种趋势更明显,即当加载角度增大至90°时,椭圆形接触面模型种植体及周围骨组织的最大等效应力、修复体的最大位移分别为196和101 MPa、0.196 mm,而梯形接触面模型分别为157和72 MPa、0.164 mm.结论 下颌中切牙种植单端固定桥桥体与邻牙的梯形接触面有利于减小杠杆作用对种植体及周围骨组织产生的影响.%Objective To investigate effect of the contact surface between the bridge and the adjacent teeth on the stress distribution of the implant and bone tissue and the displacement of the prosthesis in the cantilever fixed implant bridge restoring missing mandibular central incisors. Methods Two?dimensional images of the mandible and dentition in healthy adults were obtained using CT data. A three?dimensional finite element model of cantilever fixed bridge supported by implants with mandibular central incisor was established by computer reconstruction technique.The contact surface between the bridge and the adjacent natural tooth was designed as "oval" and "trapezoid". The "trapezoid" has a slightly smaller median diameter on the labial side and a slightly larger medial diameter on the lingual side. Loading of 120 N was applied on the tangential margin of the middle line of the long axis of the bridge 41. The direction was set at 0°, which was parallel to the long axis of the tooth and downward. The buccal to lingual and downward angles were 30°, 45°and 60°, respectively, perpendicular to the long axis of the tooth and 90°to the lingual side. The stress distribution of the implant and surrounding bone tissue and the displacement of the prosthesis were compared between the two models. Results Under axial and buccolingual loading, the maximum equivalent stress peak in the implant and surrounding bone tissue in the cantilever with trapezoidal contact surface design and the maximum displacement of the prosthesis were lower. Moreover, the distribution of stress was more balanced and the concentration range of stress was smaller. With the loading angle increasing, this trend was more obvious. When loading angle increased to 90°, the maximum equivalent stress and the maximum displacement of the elliptic contact surface model implant and surrounding bone tissue were 196 and 101 MPa and 0.196 mm, respectively, while the trapezoidal contact surface model were 157 and 72 MPa and 0.164 mm, respectively.Conclusions The trapezoidal contact surface of the bridge and the adjacent teeth in the cantilever fixed bridge supported by implants with mandibular central incisor is beneficial to reduce the impact of the leverage on the implant and surrounding bone tissue.
    • 张思佳; 曾剑玉; 李佳; 张茹; 殷隽雅; 王辉
    • 摘要: 目的 通过光弹模型分析3种单冠对种植体周围骨应力分布的影响,以期为种植修复单冠的材料选择提供参考.方法 使用医用纯钛仿照种植体(Nobel Replace,直径为4.3 mm,长度为11.5 mm)及美观基台(标准型,穿龈高度1 mm)铸造种植体-基台一体化试件,包埋于光弹模型中.使用椅旁计算机辅助设计与辅助制作系统完成树脂陶瓷冠和氧化锆全冠的单冠制作,对切削成形的冠部形态制取硅橡胶阴模,辅助金属烤瓷冠的饰瓷堆塑.制作树脂陶瓷冠组、氧化锆全冠组和金属烤瓷冠组光弹模型试件,每组5个.对3组光弹模型分别进行垂直及斜向75°加载(300 N),通过数字光弹法分析3组种植体周围骨内不同观测面(0.5、1.5、2.5、3.5 mm)上颈部、颈1/3、中1/3、根1/3及根尖共5个观测点的应力,评价3种单冠受力后的应力缓冲作用.结果 相同加载模式下,树脂陶瓷冠组种植体周围骨应力到达峰值的时间[垂直和斜向加载分别为(1.58±0.08)和(2.75±0.21)s]均显著大于氧化锆全冠组[垂直和斜向加载分别为(1.40±0.12)和(2.30±0.25)s](P0.05),但相比氧化锆全冠组,树脂陶瓷冠组各观测点的等效应力值均呈减小趋势.斜向加载时金属烤瓷冠组种植体颈部应力集中程度最明显.结论 与氧化锆相比,复合树脂陶瓷对种植体周围骨内应力的缓冲作用更具优势.%Objective To provide a reference for a suitable alternative treatment choice for implant-supported prostheses, and to explore the influence of 3 types of prosthetic material on the stress distribution around implant. Methods The implant-abutment analogs were embedded individually into photoelastic resin blocks,which were medical pure titanium castings reproducing the surface and outline of implant (diameter 4.3 mm,length 11.5 mm) and esthetic abutment (regular profile, 1 mm). The prostheses were divided into 3 groups according to the type of prosthetic material.Each group consisted of 5 samples. The samples of composite resin ceramic and zirconia group were milled by chair-side computer aided design and computer aided manufacture(CAD/CAM)system.The samples of porcelain-fused-to-metal crown group were made manually and a pre-arranged silicone rubber impression of CAD/CAM crown would guide to shape the veneer porcelain.Each set was submitted to a 300 N compressive load axially or obliquely(75°). The stress value in the peri-implant bone at the level of the neck, neck1/3, middle1/3 and root1/3 of the sections(0.5,1.5,2.5,3.5 mm)from implant was analyzed by digital photoelasticity,and the stress cushioning effect of 3 types of prosthetic material was comprehensively evaluated. Results The time spent reaching the stress peak of composite resin ceramic group[(1.58±0.08)s,axially;(2.75±0.21)s,obliquely]was larger than that of the zirconia group [(1.40 ± 0.12) s, axially; (2.30 ± 0.25) s, obliquely] (P0.05), a downward trend of equivalent stress values of composite resin ceramic group was observed compared to zirconia group, regardless of load type. When loaded obliquely,the highest degree of stress concentration at the level of the neck of implant were found in the porcelain-fused-to-metal crown group. Conclusions Within the limitations of this study, composite resin ceramic was more beneficial to the biomechanical behavior of implant in stress buffer compared to zirconia.
    • 杨殷杰; 侯本祥; 侯晓玫
    • 摘要: 目的:比较高压蒸汽灭菌对K3XF和K3表面形态和疲劳折断性能的影响.方法:将25 mm长、25#/0.06锥度的K3XF和K3各48支随机分为4组(n=12),组1不做处理,组2~4分别进行高压蒸汽灭菌,分别循环10次、20次、30次.每组随机选取2支锉在扫描电子显微镜(scanning electron microscope,SEM)下观察表面形态,其余10支锉使用60°弯曲角度、3.5 mm弯曲半径的模拟金属根管进行疲劳折断实验.记录疲劳折断时间,计算疲劳折断圈数(number of cyclic fatigue,NCF),测量折断段长度,并对折断断口进行SEM观察.以SAS 9.3软件进行双因素方差分析,显著性水平0.05.结果:SEM观察可见K3XF表面粗糙,呈现微孔结构,K3沟槽处表面有明显车磨条纹,切割刃处较平滑.高压蒸汽灭菌使K3XF的微孔数量增加且孔径变大,K3的车磨条纹变形、受挤压、裂开.K3XF新锉的NCF为210±59,高压蒸汽灭菌10次、20次、30次后的NCF分别为178±37,208±48和227±43,与新锉相比,差异均无统计学意义(P>0.05).K3新锉的NCF为145±38,高压蒸汽灭菌10次、20次后的NCF分别为128±43和124±46,与新锉相比,差异均无统计学意义(P>0.05),但是高压蒸汽灭菌30次后,NCF显著升高到216±38(P <0.05),所有断口均呈典型的疲劳折断特征.结论:K3XF经多次高压蒸汽灭菌后,表面粗糙度增加,但是疲劳折断性能保持稳定.
    • 马雅静; 王健; 武秀萍; 韩建宁; 李冰
    • 摘要: Objective To analyze the stress distribution of all-ceramic post-and-core crown and residual dentin by finite element method, and to provide theoretical basis for clinical repair of tooth defect. Methods A three-dimen-sional finite element model of the maxillary first molar dentin defect with 2 mm high and nearly 1/2 defect, which was repaired by the all-ceramic post-and-core crown, was established with five force loading modes. The stress distribution of the interior and the interface of the all-ceramic post-and-core crown were determined. Results At the loading points, the stress concentration on the crown surface could be caused. Under different loading modes, the stress peaks of the all-ceramic post-and-core crown were 144.59 MPa, 7.26 MPa, 123.94 MPa, 124.50 MPa and 20.87 MPa, re-spectively. Conclusion When the dentin shoulder is 2 mm, with nearly 1/2 defect, the all-ceramic post-and-core crown repair can be used. It should be noted that, the functional tip slope should be blunt to avoid stress concentra-tion.%目的 运用有限元法对全瓷桩核冠和剩余牙本质上的应力分布规律进行数值分析,为牙体缺损的临床修复提供理论依据.方法 建立上颌第一磨牙牙体缺损牙本质肩领2 mm高,近中1/2缺损经全瓷桩核冠修复的三维有限元模型,并对其进行5种力的加载方式,观察全瓷桩核冠内部和界面的应力分布情况.结果在加载点可引起牙冠表面应力集中,在不同的加载方式下全瓷冠表面的应力峰值分别为144.59 MPa、7.26 MPa、123.94 MPa、124.50 MPa、20.87 MPa.结论 当牙本质肩领为2 mm,近中1/2缺损时,可采用全瓷桩核冠进行修复,只是要注意功能尖斜面要调磨圆钝,避免应力集中.
    • 傅昭然; 田福聪; 张路; 韩冰; 王晓燕
    • 摘要: 目的:研究一步法和两步法通用型粘接剂与不同双固化树脂水门汀匹配使用时,光固化模式对牙本质粘接强度的影响.方法:选用一步法通用型粘接剂Single Bond Universal(SBU)和两步法通用型粘接剂OptiBondVersa (VSA)作为研究对象,以一步法自酸蚀粘接剂OptiBond All in One (AIO)和两步法自酸蚀粘接剂Clearfil SEBond (SEB)作为对照,同时选择RelyX Ultimate (RLX)和Nexus 3 Universal(NX3)作为不同的双固化树脂水门汀.收集新鲜无龋磨牙80颗,切除冠部釉质,暴露牙本质平面.根据粘接剂种类、粘接剂是否进行光固化和水门汀种类的不同组合分为16组,每组随机5颗.按照说明使用各组粘接剂,光固化(10 s)或者不进行光固化后,在粘接剂上方放置树脂水门汀厚度为1 mm,光照20 s(650 mW/cm2),然后在水门汀上方分层填压复合树脂并固化(厚度5 mm).水中储存24h后,使用慢速切片机制备横截面积1 mm×1 mm的条形树脂-水门汀-牙本质样本,测定微拉伸粘接强度.结果:SBU光固化后与RLX和NX3联合使用,粘接强度[(35.45±7.04) MPa和(26.84±10.39)MPa]显著高于未光固化组[(17.93 ±8.93) MPa和(10.07 ±5.89) MPa,P<0.001].SBU在相同光固化模式下,与RLX匹配使用的粘接强度显著高于与NX3匹配使用的粘接强度(P<0.05).与对照AIO相比,SBU光固化后与RLX匹配使用时的粘接强度高于AIO组[(35.45±7.04) MPa傩.(24.86±8.42) MPa,P<0.05],而未光固化下SBU的粘接强度低于AIO组[(17.93 ±8.93) MPavs.(22.28±7.57) MPa,P<o.05].两步法通用型粘接剂VSA与对照粘接剂SEB在不同的光照模式及联合使用不同的水门汀各组之间的粘接强度(25.98~32.24 MPa)差异没有统计学意义(P>0.05).结论:一步法通用型粘接剂的固化模式以及双固化水门汀的种类对于水门汀与牙本质的粘接强度均有一定的程度的影响.对于两步法通用型粘接系统,固化模式以及水门汀的种类对于水门汀与牙本质的粘接强度无显著影响.%Objective:To determine the effects of curing mode of one-step and two-step universal adhesives on the micro-tensile bond strength (μTBS) of different dual-cure resin cements to dentin.Methods:One-step universal adhesive Single Bond Universal (SBU),and two-step universal adhesive OptiBond Versa (VSA) were chosen as the subjects,one-step self-etching adhesive OptiBond All in One (AIO) and two-step self-etching adhesive Clearfil SE Bond (SEB) were control groups,and two dualcure resin cements RelyX Ultimate (RLX) and Nexus 3 Universal (NX3) were used in this study.In this study,80 extracted human molars were selected and the dentin surface was exposed using diamond saw.The teeth were divided into 16 groups according to the adhesives (AIO,SBU,SEB,VSA),cure modes of adhesives (light cure,non-light cure) and resin cements (RLX,NX3).The adhesives were applied on the dentin surface following the instruction and whether light cured or not,then the resin cements were applied on the adhesives with 1 mm thickness and light cured (650 mW/cm2) for 20 s.A resin was built up (5 mm) on the cements and light cured layer by layer.After water storage for 24 h,the specimens were cut into resin-cement-dentin strips with a cross sectional area of 1 mm ± 1 mm and the μTBS was measured.Results:Regarding one-step universal adhesive (SBU) light cured,the μTBS with RLX [(35.45 ±7.04) MPa] or NX3 [(26.84 ±10.39) MPa] were higher than SBU non-light cured with RLX [(17.93 ± 8.93) MPa)] or NX3 [(10.07 ± 5.89) MPa,P < 0.001].Compared with AIO,light-cured SBU combined with RLX presented higher μTBS than AIO group [(35.45 ± 7.04) MPa vs.(24.86 ±8.42) MPa,P<0.05].When SBU was not lighted,the μTBS was lower than AIO [(17.93 ± 8.93) MPa vs.(22.28 ± 7.57) MPa,P < 0.05].For two-step universal adhesive (VSA) and control adhesive (SEB),curing mode did not affect the μTBS when used with either RLX or NX3 (25.98-32.24 MPa,P > 0.05).Conclusion:Curing mode of one-step universal adhesive may affect the μTBS between dual-cure resin cements and dentin,while for two-step universal adhesive,the curing mode and the type of resin cements did not influence the μTBS.
    • 姚蔚12; 陈维毅1; 李冰2; 赵彬2; 王为3
    • 摘要: 背景:桩核冠修复牙体缺损是恢复牙齿形态与功能的有效方法,但其修复效果受到多种因素影响,需进一步研究多重影响的效应以优化设计。目的:研究不同咬合接触状态下,不同程度牙体缺损采用不同桩核材料修复后的组织应力水平变化。方法:通过CT数据建立人下颌第一磨牙的三维实体模型,并通过软件生成完整天然牙、6种缺损形式(全颌面轻度缺损、全颌面重度缺损、近中颌面轻度缺损、近中颌面重度缺损、远中颌面轻度缺损、远中颌面重度缺损)及2种桩核(纤维桩、氧化锆桩)冠修复的模型,导入ANSYS三维有限元软件,分析在稳定咬合接触(ABC)和不稳定咬合接触(AC)状态下的牙体、牙周组织应力。结果与结论:相对于稳定咬合(ABC)接触,不稳定咬合(AC)接触提高了牙体和牙周组织应力水平,并且不稳定咬合对修复后牙影响更明显;采用高弹性模量的桩材料修复时,牙体组织应力更高且缺损越大应力越高;纤维桩修复后牙周组织应力略高于氧化锆桩,与缺损形式关系不明显;结果表明,临床修复体咬合调整需精确恢复,尤其是不能缺少B区接触。
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