CN115068173A - 一种用于牙种植区骨缺损重建的个性化peek网 - Google Patents
一种用于牙种植区骨缺损重建的个性化peek网 Download PDFInfo
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Abstract
本发明公开了一种用于牙种植区骨缺损重建的个性化PEEK网,属于医疗器械技术领域,通过正向与逆向相结合的方式设计了与骨缺损周围骨形态十分贴合的个性化PEEK网,PEEK网的表面贴合于牙槽骨骨缺损的外表面并设有固位孔,其表面的固位孔利用固位钉与牙槽骨连接固定,PEEK网的表面开设有均匀分布的网孔以及加强筋。本发明确定了主体厚度为0.6mm,孔径大小为0.25mm的个性化PEEK网,可以实现最佳的成骨诱导效果,在牙槽骨骨缺损区域上设计了加强筋,可以增强其力学性能,避免由于牙齿咬合而导致个性化PEEK网失效等问题。PEEK材料由于出色的生物相容性和类骨生物力学特性,已成为潜在的金属替代材料之一,一种用于牙种植区骨缺损重建的个性化PEEK网可以促进良好的成骨诱导效果,并且低刚度的特性降低了暴露的风险,贴合性更好。
Description
技术领域
本发明涉及医疗器械技术领域,更具体涉及一种用于牙种植区骨缺损重建的个性化PEEK网。
背景技术
口腔种植中复杂牙槽骨缺损修复通常采用钛网进行植骨,钛网虽然展现出良好的骨增量效果,但钛网的高刚度也可能引起软组织裂开和钛网暴露等问题,并且需要术前或术中进行弯制,存在贴合性较差、固定位点不准确、术后暴露率高等问题。
随着计算机辅助设计和增材制造技术的不断发展,数字化建模结合增材制造成为解决牙种植区骨缺损重建的最佳选择。PEEK材料作为潜在的金属替代材料之一,具有更佳的生物相容性能,与人体骨骼相似的机械强度和弹性模量,目前PEEK材料已经广泛应用于股骨重建、髋关节置换、脊柱外科手术、颅骨成形术等。由于出色的生物相容性和类骨生物力学特性,牙种植区骨缺损重建的个性化PEEK网贴合性更好,可以促进良好的成骨诱导效果,并且低刚度的特性降低了暴露的风险。
发明内容
本发明需要解决的技术问题是现有技术中的牙种植区骨缺损重建存在各种缺陷,提供一种用于牙种植区骨缺损重建的个性化PEEK网。
为解决上述技术问题,本发明所采取的技术方案如下:
一种用于牙种植区骨缺损重建的个性化PEEK网,包括牙槽骨和PEEK网主体,所述牙槽骨的表面设置有骨缺损部位,所述PEEK网主体的形状匹配于所述牙槽骨骨缺损修复后的形状和尺寸,所述PEEK网主体相对应的两侧分别与人体唇颊侧以及舌腭侧相对应,所述PEEK网主体的表面贴合于牙槽骨骨缺损的外表面并设有固位孔,所述PEEK网主体通过其表面的固位孔以及固位钉与牙槽骨连接固定,所述PEEK网主体的表面设有均匀分布的网孔以及加强筋。
进一步的,所述PEEK网主体上设置有固位孔、网孔、加强筋,所述固位孔设置于所述PEEK网主体的唇颊侧以及舌腭侧,且匹配于固位钉的形状和尺寸,所述网孔均匀设置于所述PEEK网主体的表面上,所述加强筋设置于PEEK网主体对应的牙槽骨骨缺损区域范围内。
进一步的,所述PEEK网主体在牙槽骨骨缺损表面延伸至与正常牙槽骨形态位置,确保唇颊侧和舌腭侧至少保留1.5mm的牙槽骨骨量;所述PEEK网主体的主体厚度为0.5mm和0.6mm两种厚度。
进一步的,所述固位孔的数量为两组,且分别与牙槽骨的唇颊侧以及舌腭侧相对应,所述固位孔在舌腭侧的数量一个,在唇颊侧的数量两个,其中唇颊侧两个固位孔距边缘线为2mm,舌腭侧一个固位孔位于两侧中线且距顶端边缘线2mm,固位孔的直径统一为1.7mm。
进一步的,所述网孔在PEEK网主体的表面均匀分布,其中相邻的两个网孔之间间距相等为1mm,所述网孔的直径为0.25、0.35、0.45mm三种直径。
进一步的,所述加强筋是由网孔直径为内圆环,向外侧偏移一个网孔直径为外圆环,封闭后形成的加强筋厚度为0.2mm。
进一步的,所述三种网孔直径,两种厚度的PEEK网主体通过仿真分析选取力学性能最佳型号的PEEK网进行3D打印。
进一步优化技术方案,上述所述的一种用于牙种植区骨缺损重建的个性化PEEK网,包括以下具体步骤:
S1、根据患者颌面部的CBCT数据导入Mimics软件中进行三维重建,获得牙种植区骨缺损三维模型;
S2、对牙种植区骨缺损三维模型表面质量进行优化后导出为STL格式文件;
S3、将STL格式文件导入逆向三维设计软件Geomagic Wrap中,对三角面片文件表面孔洞和缺陷进行修复处理,以患者健康侧为参考,建立符合患者牙槽骨个性形态的缺损区骨表面;
S4、在Geomagic Wrap软件中设计出0.5mm、0.6mm厚度的PEEK网主体,将三维模型导出为IGES格式文件;
S5、将IGES格式文件导入正向三维设计软件UG中,建立出网孔孔径为0.25mm、0.35mm、0.45mm,相邻孔中心距为1mm的6种规格的PEEK网;
S6、在UG软件中设计出位于牙槽骨骨缺损区域范围内的加强筋,将不同规格的三维模型固定于骨缺损区域导出为STEP格式文件;
S7、将STEP格式文件导入有限元分析软件Ansys中,设置材料属性、网格划分、施加载荷边界条件进行有限元分析;
S8、根据有限元分析结果选取力学性能最佳的牙种植区骨缺损重建的个性化PEEK网;
S9、根据三维模型,通过3D打印机打印出实物个性化PEEK网装置。
本发明与现有技术相比,具有如下的优点和有益效果:
本发明依据CBCT数据建立了牙种植区骨缺损的三维模型,通过正向与逆向相结合的方式设计了个性化PEEK网,确定了最佳主体厚度以及网孔直径,利用3D打印技术成型的PEEK网具备高精度,可以精准的根据骨缺损周围与PEEK网接触的骨形态打印出十分贴合的PEEK网,为缺损部位提供精准的高度和宽度,保护骨填充物的形态。本发明在牙槽骨骨缺损区域上设计了加强筋,保证骨缺损区域具有良好的骨增量效果,还具有较强的力学性能,在日常活动中避免由于牙齿咬合而导致个性化PEEK网失效等问题。PEEK材料由于出色的生物相容性和类骨生物力学特性成为潜在的金属替代材料之一,牙种植区骨缺损重建的个性化PEEK网可以促进良好的成骨诱导效果,并且低刚度的特性降低了暴露的风险,贴合性更好,减小了患者痛苦。
附图说明
图1为本发明在上颌骨牙槽骨缺损的PEEK网安装的建模示意图;
图2为本发明设计的个性化PEEK网的建模示意图;
图3为本发明的方法流程图。
图中:1-牙槽骨,2-PEEK网主体,3-固位孔,4-网孔,5-加强筋。
具体实施方式
下面将结合附图和具体实施例对本发明进行进一步详细说明,本发明的示意性实施方式及其说明仅用于解释本发明,并不作为对本发明的限定。
实施流程结合图3所示,具体按照以下骤进行。
步骤1:根据患者拍摄颌面部CBCT,格式为DICOM格式,将数据导入Mimics21软件中通过调整CT图像的阈值进行三维重建,获得颌骨骨缺损的三维模型;使用“3D工具”中的“光滑”和“包覆”命令,其中光滑因子为0.6,迭代5次,包覆最小细节尺寸为1mm,对优化后的三维模型导出为STL格式文件。
步骤2:将STL格式文件导入Geomagic Wrap2015软件中使用“多边形”工具栏里的“修补”“平滑”“填充孔”等命令对面片文件表面孔洞和缺陷进行修复;以患者健康侧为参考,使用“套索”工具选中骨缺损周围健康区域,并利用工具“镜像”的方法建立符合患者牙槽骨1个性形态的缺损区骨表面;使用“偏移整体”“搭桥”“填充孔”等命令将建立出由牙槽骨1缺损区表面偏移设计出0.5mm、0.6mm厚度的PEEK网主体2;使用“精确曲面”工具栏命令将三角面片模型拟合为NURBS曲面,三维模型导出为IGES格式文件。
步骤3:将IGES格式文件导入UG12.0正向三维设计软件中,对网孔4草图使用“拉伸”命令,对网孔4和PEEK网主体2使用布尔“减去”命令建立出孔径为0.25mm、0.35mm、0.45mm,相邻孔中心距为1mm为1mm的6种规格的PEEK网;使用“常规孔”命令在舌腭侧建立一个固位孔3,在唇颊侧建立两个固位孔3,其中唇颊侧两个固位孔3距边缘线为2mm,舌腭侧一个固位孔3位于两侧中线且距顶端边缘线2mm,固位孔3的直径统一为1.7mm;对加强筋5草图使用“拉伸”命令,对加强筋5和个性化PEEK网使用“移动面”“修剪体”“合并”等命令建立出在牙槽骨1骨缺损区域上具有加强筋5的个性化PEEK网,将不同规格的三维模型固定于骨缺损区域导出为STEP格式文件。
步骤4:将STEP格式文件导入Ansys19.0有限元分析软件中,设置PEEK网的材料属性为聚醚醚酮(弹性模量4000Mpa,泊松比0.36),牙槽骨的材料属性为皮质骨(弹性模量15000Mpa,泊松比0.3),网格划分质量达到0.75以上,对PEEK网施加载荷边界条件:将代表咬合情况下的最大生理负荷力(100N)垂直施加于骨缺损区域的PEEK网上进行有限元分析。
步骤5:根据分析结果见表1,选取在受力过程中安全系数最高不易发生断裂,即最大等效应力与屈服强度比值最小的牙种植区骨缺损重建的个性化PEEK网,最终选取厚度为0.6mm,孔径为0.25mm的PEEK网,导出STL格式三维模型,通过3D打印机打印出实物个性化PEEK网装置。
本技术领域中的普通技术人员应当认识到,以上的实施例仅是用来说明本发明,而并非用作为对本发明的限定,只要在本发明的实质精神范围内,对以上所述实施的变化、变型都将落在本发明的权利要求书范围内。
表1
孔径大小(mm) | 0.5mm最大等效应力(Mpa) | 0.6mm最大等效应力(Mpa) | 0.5mm屈服强度比值 | 0.6mm屈服强度比值 |
0.25 | 230.96 | 93.42 | 2.48 | 1.00 |
0.35 | 290.56 | 120.79 | 3.12 | 1.30 |
0.45 | 312.26 | 171.66 | 3.36 | 1.85 |
Claims (8)
1.一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:包括牙槽骨(1)和PEEK网主体(2);所述牙槽骨(1)的表面设置有骨缺损部位,其特征在于:所述PEEK网主体(2)的形状匹配于所述牙槽骨(1)骨缺损修复后的形状和尺寸;所述PEEK网主体(2)相对应的两侧分别与人体唇颊侧以及舌腭侧相对应;所述PEEK网主体(2)的表面贴合于牙槽骨(1)骨缺损的外表面并设有固位孔(3);所述PEEK网主体(2)通过其表面的固位孔(3)以及固位钉与牙槽骨(1)连接固定;所述PEEK网主体(2)的表面开设有均匀分布的网孔(4)以及加强筋(5)。
2.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:所述PEEK网主体(2)上设置有固位孔(3)、网孔(4)、加强筋(5),所述固位孔(3)设置于所述PEEK网主体(2)的唇颊侧以及舌腭侧,且匹配于固位钉的形状和尺寸,所述网孔(4)均匀设置于所述PEEK网主体(2)的表面上,所述加强筋(5)设置于PEEK网主体(2)对应的牙槽骨(1)骨缺损区域范围内。
3.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:所述PEEK网主体(2)在牙槽骨(1)骨缺损表面延伸至与正常牙槽骨形态位置,确保唇颊侧和舌腭侧至少保留1.5mm的牙槽骨骨量;所述PEEK网主体(2)的主体厚度为0.5mm和0.6mm两种厚度。
4.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:所述固位孔(3)的数量为两组,且分别与牙槽骨(1)的唇颊侧以及舌腭侧相对应,所述固位孔(3)在舌腭侧的数量一个,在唇颊侧的数量两个,其中唇颊侧两个固位孔(3)距边缘线为2mm,舌腭侧一个固位孔(3)位于两侧中线且距顶端边缘线2mm,固位孔的直径统一为1.7mm。
5.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:所述网孔(4)在PEEK网主体(2)的表面均匀分布,其中相邻的两个网孔(4)之间间距相等为1mm,所述网孔(4)的直径为0.25、0.35、0.45mm三种直径。
6.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:所述加强筋(5)是由网孔(4)直径为内圆环,向外侧偏移一个网孔直径为外圆环,封闭后形成的加强筋(5)厚度为0.2mm。
7.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:所述三种网孔(4)直径,两种厚度的PEEK网主体(2)通过仿真分析选取力学性能最佳型号的PEEK网进行3D打印。
8.根据权利要求1所述的一种用于牙种植区骨缺损重建的个性化PEEK网,其特征在于:包括以下具体步骤:
S1、根据患者颌面部的CBCT数据导入Mimics软件中进行三维重建,获得牙种植区骨缺损三维模型;
S2、对牙种植区骨缺损三维模型表面质量进行优化后导出为STL格式文件;
S3、将STL格式文件导入逆向三维设计软件Geomagic Wrap中,对三角面片文件表面孔洞和缺陷进行修复处理,以患者健康侧为参考,建立符合患者牙槽骨(1)个性形态的缺损区骨表面;
S4、在Geomagic Wrap软件中设计出0.5mm、0.6mm厚度的PEEK网主体(2),将三维模型导出为IGES格式文件;
S5、将IGES格式文件导入正向三维设计软件UG中,建立出网孔孔径为0.25mm、0.35mm、0.45mm,相邻孔中心距为1mm的6种规格的PEEK网;
S6、在UG软件中设计出位于牙槽骨(1)骨缺损区域范围内的加强筋,将不同规格的三维模型固定于骨缺损区域导出为STEP格式文件;
S7、将STEP格式文件导入有限元分析软件Ansys中,设置材料属性、网格划分、施加载荷边界条件进行有限元分析;
S8、根据有限元分析结果选取力学性能最佳的牙种植区骨缺损重建的个性化PEEK网;
S9、根据三维模型,通过3D打印机打印出实物个性化PEEK网装置。
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