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How to make clear aligner
Thermoform
It explains know-how for thermoforming, cleaning and packing.
Thermoforming process
Thermoforming > trimming > polishing/cleaning
Item
Pressure forming
Vacuum forming
Pressure
Principle
Strength and weakness
Expensive
High forming quality
Cheap
Low forming quality
4~6 bar
Select forming equipment
Minimum specification:
pressure 4 bar or more
Sheet selection criteria
Clear aligner is a device for oral use, and the sheet must be a certified medical device. Medical device certified products have no problem with treatment. The difference between high and low prices is due to difference in product characteristics such tensile strength depending on raw materials and manufacturing processes. Products with good characteristics are expensive products, and have positive effects such as wearing comfort and shortening the treatment period.
There are 3 types of sheet depending on the thickness of the product.
Item
Soft
Medium
Hard
Thickness
0.5mm
(0.020inch)
0.625mm
(0.025inch)
0.75mm
(0.030inch)
Tooth movement range
0.6~1.0mm
0.4~0.6mm
0.2~0.4mm
Image
Blockout
In case sheet does not fall out by undercuts, or in case sheet is torn by sharp edges,
it is task of supplementing the model with resin for blockout or with heating-resistant material
A typical case of blockout
Gums are high
Adjust pellet
Adjusting to fit gums
Print model low
Adjusting to fit gums
Thermoforming method
Ensure that the height of model being molded is only up to the gums that will be used as devices.
If it is too high, the sheet stretches a lot and becomes thin, and a device of uniform thickness cannot be made.
Use a height-adjustable equipments, or adjust the base height carefully printing.
Precautions when removing devices
To prevent deformation or tearing of the device, remove unnecessary parts as much as possible in advance, and do not remove them all at once, but remove the rearmost molar part little by little.
TIP : Use curved scissors. You can easily cut to fit the arch line using curved scissors.
Trimming
Please cut 2~4mm below the margin using curved scissors.
Trimming area
Strength and weakness
Little force transmitted
No foreign body feeling
Strength and weakness
Lot force transmitted because there are many parts
to wrap May feel foreign body
Along margin line
Straightly 2~4mm below margin line
Polishing & cleaning
Smoothly round the sharp part of the cut section, clean to remove foreign objects and bacteria.
TIP :
When polishing with handpiece, it must move in one direction along the direction of rotation of the wheel.
When cleaning with air, be careful that the device may be deformed if too strong force is applied.
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