计算机辅助设计与快速成型技术在颌骨缺损修复中的应用

Tong Dai, Feng Hai-lan, Li Yan-sheng, Zhou Zhi-bo

Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing 100081, China.

Zhonghua Kou Qiang Yi Xue Za Zhi. 2007 Jun;42(6):333-6.

OBJECTIVE

To test a new cast-making method based on computer aided design (CAD) and rapid prototyping (RP) technology for defected maxilla.

METHODS

Head CT data of 12 patients with defected maxilla were transmitted into a computer. Three-dimensional digital image of the patient's defected maxilla was then obtained based on Mimics 8.11 and Geomagic 7.0 and the plastic cast of the defected region was manufactured by prototyping. The obturator was made on this plastic cast that duplicated the undercut tissue of defected area. The prominent part of the obturator was made of elastic heat-curing resin and it was helpful to gain the retention through the engagement between the obturator and the tissue undercut. After the obturator was finished, the upper removable partial denture was fabricated in conventional method. The combination of these two parts was achieved using magnetic attachment. Clinical effects of obturator and removable partial denture were evaluated and the nasalance value of 5 patients before and after insertion of the obturator was measured using nanometer.

RESULTS

The obturator and removable partial denture could be seated into place separately. They all had good retention and stability. After the obturator was seated in place, the nasalance of non-nasal and vowel text decreased from (46.53 +/- 13.86)% to (22.60 +/- 8.52)% (P < 0.001).

CONCLUSIONS

The cast-making method based on CAD and RP technology for cast-making of defected maxilla is feasible and practical.

目的

测试一种基于计算机辅助设计（CAD）和快速成型（RP）技术的上颌骨缺损铸型制作新方法。

方法

将12例上颌骨缺损患者的头部CT数据传输至计算机。然后基于Mimics 8.11和Geomagic 7.0软件获取患者上颌骨缺损的三维数字图像，并通过快速成型制作缺损区域的塑料铸型。在该复制了缺损区域倒凹组织的塑料铸型上制作阻塞器。阻塞器的突出部分由弹性热固化树脂制成，通过阻塞器与组织倒凹之间的嵌合有助于获得固位。阻塞器完成后，采用传统方法制作上颌可摘局部义齿。这两个部分通过磁性附着实现组合。评估阻塞器和可摘局部义齿的临床效果，并使用鼻音计测量5例患者在佩戴阻塞器前后的鼻音值。