Step 1: Determine trim lines
It’s a good idea to draw out your trimlines on the cast before draping.
You can use an indelible pencil or a black sharpie, whichever is preferred.
Step 2: Mark the location of the holes
Make sure to mark your holes outside of your trimlines.
Try to keep each hole a consistent length away from your timelines.
Step 3: Drill holes into cast
Drill holes into your cast around the outside of your trimline.
Drill bit size can depend on the size of your cast and the thickness of your plastic
The thicker the plastic, the larger drill bit you can use.
1/4 inch drill bit was used in the pictures below.
Step 4: Drape your plastic
Continue the moulding process as usual.
Step 5: Cutting out the device
Once the plastic has cooled and you’re ready to cut out your device, use the divots to create the cutting borders.
Simply cut along the the dotted line.
Step 6: Buff and finish your device!
Using this tech tip takes out the guess work in where to make your initial cut after moulding.
Tech tip by Marina, 2018, and Patricia Dang, 2014
Thanks to Active Orthopedic Solutions and Chedoke Hamilton Health Sciences for this technique.