CN111685916A - 一种个性化颌骨假体的设计方法 - Google Patents

一种个性化颌骨假体的设计方法 Download PDF

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CN111685916A
CN111685916A CN202010614300.4A CN202010614300A CN111685916A CN 111685916 A CN111685916 A CN 111685916A CN 202010614300 A CN202010614300 A CN 202010614300A CN 111685916 A CN111685916 A CN 111685916A
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mandible
personalized
prosthesis
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mandible prosthesis
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郭芳
黄硕
刘昌奎
刘宁
梁斌
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Xian Medical University
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Abstract

本发明公开了一种个性化下颌骨假体的设计方法,具体按照以下步骤实施:步骤1、利用CBCT拍摄患者颌面部的医学影像数据;将数据以DICOM格式导入医学图像处理软件Mimics,生成全头颅3D虚拟模型;将下颌骨模型从全头颅模型中进行分离,输出为STL格式文件;步骤2、将下颌骨模型的STL文件导入Geomagic软件,模拟手术过程进行病损区截骨,并对缺损区进行个性化下颌骨假体的设计,假体一共由五部分组成:①基牙、②支柱、③实体单元、④多孔单元及⑤固位单元。本发明解决了现有标准型产品其成品型号较少,与缺损区形态不一致的问题。

Description

一种个性化颌骨假体的设计方法
技术领域
本发明属于人工下颌骨设计与制备方法技术领域,具体涉及一种个性化下颌骨假体的设计方法。
背景技术
炎症、外伤、肿瘤及先天性疾病等常导致下颌骨发生形态缺陷,功能丧失,严重影响患者的生活质量。如何进行理想的功能外形重建、恢复稳定的咬合关系是修复缺损时必须面临和解决的问题。自体骨移植、同种异体骨移植和牵张成骨重建修复均存在着不足。因此,下颌骨缺损的修复重建仍是口腔颌面外科领域的难题。而人工假体具有稳定不吸收、能模仿正常的解剖形态、与宿主贴合、不需另行取材等优点,使得人工假体进行下颌骨重建成为临床可选择的有效方法之一。
钛及钛合金具有质量轻、耐腐蚀、强度高、生物相容性好的优点,且能够与骨组织形成骨结合,是临床上最常用的金属材料。常通过改性钛植入物表面来提高骨整合能力,包括粉末冶金、发泡法、凝胶注模成型法、等离子喷涂法、纤维烧结法等,但这些方法都无法有效的控制孔隙的贯通性,孔隙的结构,孔隙的大小和孔隙率,不能精确调控钛合金的弹性模量,假体的机械性能亦无法与骨组织相匹配。现有的标准型产品其成品型号较少,与缺损区形态亦不一致。但3D打印技术制作的多孔钛合金假体不仅外形结构与缺损区一致,而且内部的孔隙大小、结构和孔隙率可精确调控,更有利于细胞和血管的长入,成为较理想的下颌骨重建假体之一。
发明内容
本发明的目的是提供一种个性化下颌骨假体的设计方法,解决了现有标准型产品其成品型号较少,与缺损区形态不一致的问题。
本发明所采用的技术方案是,步骤1、利用CBCT拍摄患者颌面部的医学影像数据;将数据以DICOM格式导入医学图像处理软件Mimics,生成全头颅3D虚拟模型;将下颌骨模型从全头颅模型中进行分离,输出为STL格式文件;
步骤2、将步骤1所得的下颌骨模型的STL文件导入Geomagic软件,模拟手术过程进行病损区截骨,并对缺损区进行个性化下颌骨假体的设计,得到个性化下颌骨假体模型;
步骤3,对步骤2所得的个性化下颌骨假体模型进行精细化调整,具体过程为:删除可见的尖角特征、倒凹和起伏,进行平滑处理,得到个性化下颌骨假体;
步骤4,将步骤所得的个性化下颌骨假体的三维模型导入3D打印设备中,3D打印设备根据个性化颌骨假体三维模型逐层打印,直到个性化下颌骨假体制备完成。
本发明的特点还在于:
步骤4中个性化下颌骨假体采用SLM方法进行3D打印制造。
个性化下颌骨假体,包括有多孔单元,多孔单元顶部固定连接有实体单元,实体单元上表面设计有基牙,多孔单元两侧固定连接有固位单元,固位单元开有钉孔。
多孔单元内部设置有支柱,支柱按照天然牙根的方向排布。
实体单元下表面设置有对抗柱,对抗柱与实体单元上方基牙相对应。
多孔单元设计参数:孔隙率60-80%,孔径和丝径均为300-600μm,多孔单元的多孔结构为正十二面体结构。
个性化下颌骨假体整体材料采用Ti-6Al-4V。
基牙的形状符合全瓷牙冠的预备标准。
个性化下颌骨假体的形状及尺寸是根据患者病损区大小决定
本发明的有益效果是:
本发明定制的假体外形结构与缺损区一致,内部的孔隙大小、结构不仅有利于细胞和血管的长入以及物质的代谢,而且降低了材料的刚度,使其弹性模量和骨更为匹配,降低了应力屏蔽的发生率;基牙底部按照天然牙根的方向设计了支撑支柱,起到对多孔结构给予加强和分散牙合力的作用;固定单元被设计为实体单元,以提供固定力。此外,SLM工艺适合于制造具有定制外形和复杂内部结构的个性化植入物,为本设计的制备提供技术支持。
附图说明
图1是本发明一种个性化下颌骨假体的实施例1的颊侧观示意图;
图2是本发明一种个性化下颌骨假体的实施例1的舌侧观示意图;
图中,1.基牙,2.支柱,3.实体单元,4.多孔单元,5.固位单元,6钉孔, 7.对抗柱。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细说明。
实施例1
一种个性化下颌骨假体的设计方法,具体按照以下步骤实施:
步骤1、利用CBCT拍摄患者颌面部的医学影像数据;将数据以DICOM 格式导入医学图像处理软件Mimics,生成全头颅3D虚拟模型;将下颌骨模型从全头颅模型中进行分离,输出为STL格式文件;
步骤2、将步骤1所得的下颌骨模型的STL文件导入Geomagic软件,模拟手术过程进行病损区截骨,并对缺损区进行个性化下颌骨假体的设计,得到个性化下颌骨假体模型;
步骤3,对步骤2所得的个性化下颌骨假体模型进行精细化调整,具体过程为:删除可见的尖角特征、倒凹和起伏,进行平滑处理,得到个性化下颌骨假体;
步骤4,将步骤所得的个性化下颌骨假体的三维模型导入3D打印设备中,3D打印设备根据个性化颌骨假体三维模型逐层打印,直到个性化下颌骨假体制备完成。
步骤4中个性化下颌骨假体采用SLM方法进行3D打印制造。
一种个性化下颌骨假体,结构如图1、2所示,包括有多孔单元4,多孔单元4顶部固定连接有实体单元3,实体单元3上表面设置有基牙1,多孔单元4侧面固定连接有固位单元5,固位单元5开有钉孔6,多孔内部单元4 内部设置有支柱2,支柱2按照天然牙根的方向排布,实体单元3下表面设置有对抗柱7,对抗柱7基牙与实体单元3上表面基牙1表面相对应。
个性化下颌骨假体的形状及尺寸是根据患者病损区大小决定,个性化下颌骨假体整体材料采用Ti-6Al-4V。多孔单元4设计参数:孔隙率60-80%,孔径和丝径均为300-600μm,多孔单元4的多孔结构为正十二面体结构。
基牙1的形状符合全瓷牙冠的预备标准。
按照上述步骤设计的实施例1的一种个性化下颌骨假体根据患者病损区设定的参数包括:固位单元5厚度1mm,钉孔6直径2mm。支柱2共十根,按照天然牙根的方向对多孔结构给予加强,并分散牙合力。对抗柱7高度0.8mm,防止侧向力造成多孔结构和实体结构疲劳断裂。多孔单元4孔隙率 70%,孔径和丝径均为450μm。实体单元3位于重建颌骨的上表面,远中侧 1mm,近中1.5mm,实体单元3近中侧略厚是为了防止前磨牙周围骨组织吸收导致多孔结构暴露。

Claims (9)

1.一种个性化下颌骨假体的设计方法,其特征在于,具体按照以下步骤实施:
步骤1、利用CBCT拍摄患者颌面部的医学影像数据;将数据以DICOM格式导入医学图像处理软件Mimics,生成全头颅3D虚拟模型;将下颌骨模型从全头颅模型中进行分离,输出为STL格式文件;
步骤2、将步骤1所得的下颌骨模型的STL文件导入Geomagic软件,模拟手术过程进行病损区截骨,并对缺损区进行个性化下颌骨假体的设计,得到个性化下颌骨假体模型;
步骤3,对步骤2所得的个性化下颌骨假体模型进行精细化调整,具体过程为:删除可见的尖角特征、倒凹和起伏,进行平滑处理,得到个性化下颌骨假体;
步骤4,将步骤所得的个性化下颌骨假体的三维模型导入3D打印设备中,3D打印设备根据个性化颌骨假体三维模型逐层打印,直到个性化下颌骨假体制备完成。
2.根据权利要求1所述的一种个性化下颌骨假体的设计方法,其特征在于,所述步骤4中个性化下颌骨假体采用SLM方法进行3D打印制造。
3.根据权利要求2所述的一种个性化下颌骨假体的设计方法,其特征在于,所述个性化下颌骨假体,包括有多孔单元(4),所述多孔单元(4)顶部固定连接有实体单元(3),所述实体单元(3)上表面设置有基牙(1),多孔单元(4)两侧固定连接有固位单元(5),所述固位单元(5)开有钉孔(6)。
4.根据权利要求3所述的一种个性化下颌骨假体的设计方法,其特征在于,所述多孔单元(4)内部设置有支柱(2),所述支柱(2)按照天然牙根的方向排布。
5.根据权利要求3所述的一种个性化下颌骨假体的设计方法,其特征在于,所述实体单元(3)下表面设置有对抗柱(7),所述对抗柱(7)与实体单元(3)上表面基牙(1)相对应。
6.根据权利要求3所述的一种个性化颌骨假体的设计方法,其特征在于,所述多孔单元(4)设计参数:孔隙率60-80%,孔径和丝径均为300-600μm,多孔单元(4)的多孔结构为正十二面体结构。
7.根据权利要求3所述的一种个性化下颌骨假体的设计方法,其特征在于,所述个性化下颌骨假体整体材料采用Ti-6Al-4V。
8.如权利要求3所述的一种个性化下颌骨假体的设计方法,其特征在于,所述基牙(1)的形状符合全瓷牙冠的预备标准。
9.如权利要求3~9所述的一种个性化下颌骨假体的设计方法,其特征在于,所述个性化下颌骨假体的形状及尺寸是根据患者病损区大小决定。
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CN103315829A (zh) * 2013-06-27 2013-09-25 中国人民解放军总医院 修复一侧下颌骨缺损超过4颗牙位个性化支架的制造方法
CN107374786A (zh) * 2017-08-18 2017-11-24 华南理工大学 一种个性化多孔结构的假体制造方法
CN110613533A (zh) * 2019-09-23 2019-12-27 浙江工业大学 用于下颌骨体箱状缺损修复的pekk个性化植入体设计制作方法及植体

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CN103315829A (zh) * 2013-06-27 2013-09-25 中国人民解放军总医院 修复一侧下颌骨缺损超过4颗牙位个性化支架的制造方法
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