三维打印根型支架数字化模型的建立和验证

摘要

Object:To establish digital simulated teeth roots for three dimensional printed scaffolds to preserve alveolar ridge after tooth extraction, and verify its similarity with the extracted teeth and the tooth socket. Methods: The left mandibular incisor was ex-tracted with minimally invasion. The incisor and mandibles were scanned by Micro-CT, and a digital tooth model was established by 3D-DOCTOR software. The volume of incisor teeth, digital teeth model and teeth socket were calculated. The volume of digital teeth roots and teeth sockets were calculated by“hole filling” method. The real volume of incisor teeth was explored by flotage method. Then the data were compared to find the differences. Results:Three dimensional digital models of the skull, the left mandibular incisors and the mandibular teeth after extraction were constructed by 3D-DOCTOR software. There were no significant differences between the vol-ume of teeth roots and digital teeth roots model (P>0. 05). Both the volume of the teeth roots and that of the digital teeth were smaller than the volume of the teeth sockets (P<0. 05). The volume of sockets were smaller before than after extraction (P<0. 05). Conclu-sions:Digital simulated teeth roots for three dimensional printed scaffolds were successfully established, with high similarity to teeth roots. And its application will achieve better prognosis in alveolar ridge preservation.%目的：：为使用三维生物打印技术制备在位点保存中使用的个性化的根型支架建立数字化模型，并确认其与拔出的牙根和拔牙后牙槽窝的吻合性。方法：以微创法拔出大鼠左下颌切牙，利用Micro-CT扫描牙根和拔牙前后的下颌骨，利用3D-DOCTOR软件重建，“孔洞充填”工具计算牙根体积、牙槽窝体积，浮力法估测牙根体积，并比较几者之间的差异。结果：构建了拔牙前后大鼠下颌骨和左下切牙的三维模型；牙根实际体积与数字化模型的体积相近(P>0.05)，牙根实际体积小于牙槽窝体积(P<0.05)，牙根模型体积也小于牙槽窝体积(P<0.05)，拔牙前牙槽窝体积稍小于拔牙后牙槽窝体积(P<0.05)。结论：本研究成功建立了与真实组织吻合的数字牙根模型，为进一步三维打印支架的制备奠定基础。