Rapid Prototyped Auricular Mold (快速原型模型)

8 12 2011

Heavily inspired by the iRSM Digital Design in Facial Prosthetics workshop in Edmonton, Canada this summer, my classmate Lindsay and I conducted a study on rapid prototyping a digitally designed 3-piece auricular prosthesis mold. We utilized an iCAT to obtain DICOM files of our ear casts and patient treatment site.

The DICOM files were then imported into Materialise Mimics to mirror the existing ear to adapt to the treatment surface. It was then booleoned from a larger cylinder and digitally designed into a 3-piece auricular mold with keyways to ensure proper fitting. A workflow was then created for the digital fabrication of the mold utilizing Mimics.

The STL of the completed mold was sent to a ZPrinter 310 Plus to be rapid prototyped with a high composite powder and binder.

After printing, the mold was retrieved for postproduction work of drying, infiltrating with cyanoacrylate, and sanding for a final finish.

The prostheses fabricated from the rapid prototyped molds will be used to assess anatomical accuracies to the original ear casts and compared to the traditionally fabricated prostheses through wax sculpting. Another assessment will be made on time and cost effectiveness to determine its feasibility for clinical application.





Auricular Prosthesis (假耳)

7 05 2011

Special Topics in Anaplastology: Fabrication of an Auricular Prosthesis

Impression Making

Marking Frankfort horizontal for orientation of prosthesis on defect cast.

Impression Casting

Wax Sculpting

Mold Making

3 part mold with a wedge piece to prevent undercut behind helix.

Intrinsic Coloration & Mold Packing

Flocking – short colored fibers were added for a subtle color change and to mimic vasculature.

Base color – semi-opaque underlying skin tone; commonly identified from underside of the forearm, along the hairline, anterior to the tragus, and at the base of the helix.

Laminar glazes: pink blush, freckling, tan, highlight (cartilage), and shadow.

Trimming & Extrinsic Coloration

Trimming excess flash with scissors and smoothing helical seam with silicone bur.

Color matching for extrinsic coloration.

Extrinsic pigments added to medical adhesive moisture-cure silicone.

Deshine with confectioner sugar to alter the surface geometry of the silicone.

Once cured, rinse the sugar off with water.

Fabrication complete with piercing.





3dMD Self Portrait (三維自畫像)

6 05 2011

Using the 3dMDface System in the Craniofacial Center at the University of Illinois Medical Center, a 3D image of my face was captured. The 3dMD system utilizes Digital Surface Photogrammetry (DSP) to capture the 3D form by projecting a random light pattern with synchronized digital cameras set at various angles. By filtering different wavelengths of light, a 3D surface geometry and surface texture are acquired simultaneously, resulting in an accurate texture map when applied to the surface data.

The model was then imported into 3ds Max to create a cleaner low poly mesh with retopology. The surface texture is then mapped onto the new geometry.





Visual Word Form Area (視覺詞形區)

6 03 2011

Graphic Design Assignment 5: Concept Communication Piece

Purpose: Express the following through type, image, graphic elements, and/or CMYK color.

The part of the brain thought to be responsible for processing visual text may not require vision at all, researchers report in the journal Current Biology.

This region, known as the visual word form area, processes words when people with normal vision read, but researchers found that it is also activated when the blind read using Braille.

Full article [via The New York Times]





Ascending Colon (升結腸)

8 02 2011

Illustration Techniques Assignment 1

Objective: Produce a fully rendered, highly detailed anatomical line illustration done in Corel Painter 11 for publication in college textbook.





Indirect Plant Defense (間接植物防禦)

8 12 2010

Subject: Indirect Plant Defense

When a corn plant is munched by a caterpillar, the physical damage and certain chemicals in the caterpillar’s saliva combine to elicit release of volatile compounds from the corn leaf. This attracts parasitoid wasps that lay their eggs in the hapless caterpillars’ bodies.

Audience: Children in basic science courses of grade school

Media: Animated GIF

GIF animation is an excellent way of illustrating a simple concept while adding a real sense of motion to capture the short attention span of the students. Since animated GIF is automatically recognizable to most Web browsers, schools will only need internet connection for viewing.





Anatomical Diagram (解剖圖)

16 11 2010

Anatomical Visualization Assignment 4

Objective: Produce an anatomical diagram identifying the location of thoracic or abdominal organs relative to surface landmarks and skeletal anatomy.

Process: A human torso in anatomical position including all relevant surface anatomical landmarks was drafted using multiple anatomy atlases by Gilroy, Rohen, Clemente, and Moses. On an overlay-tracing sheet, the deep skeletal anatomy was drafted in registration with the surface anatomy using the same anatomy atlases with the addition of cadavers and skeletons from the gross lab. On a second overlay-tracing sheet, a pancreas and a spleen were placed using all the previous references with the addition of “Anatomical Landmarks” by our instructor John Daugherty. All sketches were scanned and composited with important anatomical landmarks labeled.

Lessons learned: If you draw a neck, you should draw the bottom of the chin. If you draw a mouth, you should draw the bottom of the nose. Never fade at a joint but in between the joints. Humans prefer symmetry, so mirror the better half of the anatomy.