CN107874853A - 一种具有多段结构的3d打印牙根植入体 - Google Patents
一种具有多段结构的3d打印牙根植入体 Download PDFInfo
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Abstract
一种具有多段结构的3D打印牙根植入体,该牙根植入体采用3D激光熔融法一次成型,其包括下螺纹段、中间体段和上螺纹段,所述中间体段包括实心圆柱体及包裹在实心圆柱体外圆面上的蜂巢壳结构。本发明由于采用了蜂巢壳结构,有效降低了植入体的弹性模量,从而降低了植入后对真骨组织界面产生的应力集中和应力遮挡,提高了植入相容性,并为后期的表面处理提供了通道,为骨细胞增殖提供了良好的空间,且结构稳定,受力均匀,不会产生局部应力集中而造成长时间使用后的疲劳断裂,使植入体的寿命增加3倍以上,又由于采用了不同螺纹段的设计,提高了植入体的切削性能和抓骨性能,并具有自锁死效果,使植入体稳定性提高,且采用一体式打印成型,省去了加工过程,节约了成本。
Description
技术领域
本发明涉及一种应用于口腔医疗领域的具有多段结构的3D打印牙根植入体。
背景技术
钛合金因其良好的生物相容性,优秀的力学性能及耐腐蚀性,在口腔种植领域中得到了广泛的应用。目前,钛合金牙科种植体多是由钛棒经过加工成型的螺纹状和柱状结构的单牙根体。这种方法生产的钛合金牙根植入体,制造成本高昂,过程控制质量要求严格,同时其弹性模量为天然骨质的十多倍,在植入后会对真骨组织界面产生应力集中和应力遮挡,力学相容性较差,对种植成功率和远期寿命产生影响。
选择性激光熔融(SLM)3D打印技术在钛合金产品制造领域中逐渐成熟,利用3D打印一次性高精度打印成型的优势,目前已有一些 3D打印植入体的概念及实物,这使得制造出兼顾力学性能、弹性模量和高生物相容性的植入体成为可能。
发明内容
本发明的目的在于针对上述存在问题和不足,提供一种在获得较低弹性模量的前提下仍能获得较高的整体强度和结构稳定性,且生物相容性好,同时省去加工过程,降低了制造成本的具有多段结构的3D打印牙根植入体。
本发明的技术方案是这样实现的:
本发明所述具有多段结构的3D打印牙根植入体,其特点是:该牙根植入体采用3D激光熔融法一次成型,其包括下螺纹段、中间体段和上螺纹段,所述中间体段包括实心圆柱体及包裹在实心圆柱体外圆面上的蜂巢壳结构。
其中,所述下螺纹段包括圆柱状基体及设置在圆柱状基体上的端头锥角、边缘槽和下深槽螺纹,所述端头锥角为具有一定弧度的锥形尖角结构,所述边缘槽为直角形凹槽且在圆柱状基体的外圆面上按圆周等间隔地设置有多个。
所述上螺纹段包括圆柱状基体及设置在圆柱状基体上的上深槽螺纹、浅槽螺纹和定位基座,所述定位基座为设置在圆柱状基体顶面上的多边形凹槽,且所述定位基座包括用于导向牙冠基体对接过程的导向角和用于承载牙冠基体的定位座。
所述蜂巢壳结构上密布的孔洞为正多边形孔或圆孔。
所述牙根植入体的表面设有用于提高其生物活性的电化沉淀层。
本发明与现有技术相比,具有以下优点:
(1)本发明采用蜂巢壳结构,有效降低了植入体的弹性模量,从而降低了植入后对真骨组织界面产生的应力集中和应力遮挡,提高了植入相容性;
(2)本发明采用的蜂巢壳结构,为后期的表面处理提供了通道,有利于进一步提高植入体表面的生物相容性,为骨细胞增殖提供了良好的空间;
(3)本发明采用蜂巢壳结构,具有很高的结构稳定性,各部位结构受力均匀,不会产生局部应力集中而造成长时间使用后的疲劳断裂,可使植入体的寿命增加3倍以上;
(4)本发明采用了不同螺纹段的设计,提高了植入体的切削性能和抓骨性能,同时具有自锁死效果,使植入体稳定性提高;
(5)本发明采用一体式打印成型,省去了加工过程,有效地节约了成本。
下面结合附图对本发明作进一步的说明。
附图说明
图1为本发明的平面结构示意图。
图2为本发明的剖面结构示意图。
具体实施方式
如图1-图2所示,本发明所述具有多段结构的3D打印牙根植入体,是采用3D激光熔融法(SLM)一次性打印成型,因此无需进行加工、切削。而且,该牙根植入体包括下螺纹段1、中间体段2和上螺纹段3。
其中,所述中间体段2是上螺纹段3与下螺纹段1之间的其上具有稳定空心壳状结构的连接区域,为本发明的核心部分。其包括实心圆柱体21及包裹在实心圆柱体21外圆面上的蜂巢壳结构22,所述蜂巢壳结构22上密布的孔洞221为正多边形孔或圆孔。当孔洞221为正多边形孔时,其尖角位置需进行圆弧过渡,以减少应力集中。而且,正多边形孔通常为正六边形孔。采用蜂巢壳结构22,使植入体的结构稳定,其目的是降低植入体的弹性模量,同时保证良好的整体强度,为后期电化学处理和骨细胞增殖提供通道,可有效提高生物相容性;所述实心圆柱体21位于中心区域,目的在于保证植入体能承受足够的压应力。蜂巢壳结构22的厚度和实心圆柱体21的大小可经过应力模拟结果进行调整,以满足力学性能的使用要求。
所述下螺纹段1是指位于植入体下端带有螺纹的回转柱体,其包括圆柱状基体及设置在圆柱状基体上的端头锥角11、边缘槽12和下深槽螺纹13。其中,所述端头锥角11为具有一定弧度的锥形尖角结构,其目的在于提高尖端压强并减少与牙槽骨的摩擦,便于植入体的旋入。所述边缘槽12为直角形凹槽且在圆柱状基体的外圆面上按圆周等间隔地设置有多个,其目的在于减少端头螺纹与牙槽骨的接触面积,减少骨阻力并收集螺纹在旋入过程中带出的骨组织,提高切削性能,同时在植入后的一段生长期后产生锁死效果。而设置深槽螺纹的目的是由于植入体最终旋入密度较低的松质骨,因此螺纹槽较深,螺纹的齿形结构用于提供水平方向的挤压,同时齿厚逐渐增加,用于提供垂直方向的挤压,整体提供良好的骨爪力。且下螺纹段1的直径、螺纹、边缘槽可根据单牙种植大小及所需扭矩而设计为不同规格。
所述上螺纹段3是指位于植入体上端带有螺纹的回转柱体,其包括圆柱状基体及设置在圆柱状基体上的上深槽螺纹31、浅槽螺纹32和定位基座33。其中,所述定位基座33为设置在圆柱状基体顶面上的多边形凹槽,且所述定位基座33包括用于导向牙冠基体对接过程的导向角和用于承载牙冠基体的定位座。所述上深槽螺纹31相当于下深槽螺纹13在高度方向的延伸,因此该段螺纹仍与松质骨配合。所述浅槽螺纹32位于上深槽螺纹31的上端,该段螺纹与松质骨上方的皮质骨配合,由于皮质骨密度较高,为减少对骨结构的破坏且便于植入体的旋入,因此浅槽螺纹32的齿间距及螺纹深度较小。
为了进一步提高牙根植入体的生物相容性,对牙根植入体进行喷砂后,再进行电化学表面处理。也就是说,在牙根植入体的表面形成有用于提高其生物活性的电化沉淀层,所述电化沉淀层一般为透钙磷石的电化沉淀层。
本发明的具体使用方法如下:
①根据病患的实际情况选择合适的牙根植入体,通过3D激光熔融进行制作;
②对牙根植入体进行喷砂后再进行电化学表面处理(一般为透钙磷石的电化沉淀),提高生物活性;
③在拔牙后经过对牙槽骨的修复,经过一段时间的恢复期后,通过对牙槽骨钻孔将牙根植入体植入牙槽,将牙冠基座镶嵌入植入体顶端的定位基座内;
④在经过一段时间的恢复期后,将牙冠镶嵌于牙冠基座,完成牙体植入。
本发明是通过实施例来描述的,但并不对本发明构成限制,参照本发明的描述,所公开的实施例的其他变化,如对于本领域的专业人士是容易想到的,这样的变化应该属于本发明权利要求限定的范围之内。
Claims (5)
1.一种具有多段结构的3D打印牙根植入体,其特征在于:该牙根植入体采用3D激光熔融法一次成型,其包括下螺纹段(1)、中间体段(2)和上螺纹段(3),所述中间体段(2)包括实心圆柱体(21)及包裹在实心圆柱体(21)外圆面上的蜂巢壳结构(22)。
2.根据权利要求1所述具有多段结构的3D打印牙根植入体,其特征在于:所述下螺纹段(1)包括圆柱状基体及设置在圆柱状基体上的端头锥角(11)、边缘槽(12)和下深槽螺纹(13),所述端头锥角(11)为具有一定弧度的锥形尖角结构,所述边缘槽(12)为直角形凹槽且在圆柱状基体的外圆面上按圆周等间隔地设置有多个。
3.根据权利要求1所述具有多段结构的3D打印牙根植入体,其特征在于:所述上螺纹段(3)包括圆柱状基体及设置在圆柱状基体上的上深槽螺纹(31)、浅槽螺纹(32)和定位基座(33),所述定位基座(33)为设置在圆柱状基体顶面上的多边形凹槽,且所述定位基座(33)包括用于导向牙冠基体对接过程的导向角和用于承载牙冠基体的定位座。
4.根据权利要求1所述具有多段结构的3D打印牙根植入体,其特征在于:所述蜂巢壳结构(22)上密布的孔洞(221)为正多边形孔或圆孔。
5.根据权利要求1所述具有多段结构的3D打印牙根植入体,其特征在于:所述牙根植入体的表面设有用于提高其生物活性的电化沉淀层。
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