Coward T J, Watson R M, Wilkinson I C
Department of Prosthetic Dentistry, King's Dental Institute, London, United Kingdom.
Int J Prosthodont. 1999 Jan-Feb;12(1):20-7.
The purpose of this article is to describe an automated technique that creates a mirror-image wax model of the contralateral ear using a rapid prototyping technique, which allows precise positioning and adaptation to the deficient side of the face.
Magnetic resonance images (MRI) are taken of the face and then digitized and reformatted into a 3-dimensional image. The image of the normal ear is extracted, mirrored, and positioned onto the image of the deformed side of the face. The digitized data, when used in conjunction with stereolithography, produces a photopolymerized resin model ear. A model wax ear is created by pouring molten wax into a silicone mold of the resin model ear.
A model wax ear of identical dimensions, shape, and internal contouring as the contralateral normal ear is created. The technique allows the undersurface of the model wax ear to be precisely positioned against the surface contours of the deformed side of the face in 1 patient.
The use of stereolithography from MRI scan data is a suitable technique for producing a model wax ear that fits the deformed side of the face. The 3-dimensional computer image of the face may also be used to plan the position (level and protrusion) of the ear.
本文的目的是描述一种自动化技术，该技术使用快速成型技术创建对侧耳的镜像蜡模型，从而实现精确放置并使其与面部缺损侧适配。
对面部进行磁共振成像（MRI），然后将其数字化并重新格式化为三维图像。提取正常耳的图像，进行镜像处理，然后放置到面部变形侧的图像上。数字化数据与立体光刻技术结合使用时，可制作出光聚合树脂模型耳。通过将熔化的蜡倒入树脂模型耳的硅胶模具中，制作出模型蜡耳。
制作出了与对侧正常耳尺寸、形状和内部轮廓相同的模型蜡耳。该技术能够使模型蜡耳的底面在1例患者中精确贴合面部变形侧的表面轮廓。
利用MRI扫描数据进行立体光刻是制作适合面部变形侧的模型蜡耳的合适技术。面部的三维计算机图像也可用于规划耳朵的位置（高度和突出度）。
