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FLEXIBLE DENTURE Cad/Cam Discs
Flexible (Acetal / POM) CAD-CAM Discs Used in Dentistry
Acetal (Polyoxymethylene - POM) is the most common flexible metal-free material used for removable partial dentures and clasps. It is milled from CAD/CAM discs, similar to PEEK but with more flexibility and tooth-colored esthetics.
Below is the same type of information you asked for earlier for PEEK, but now for flexible Acetal discs.
1. Standard Acetal Disc Sizes
Diameter
Most dental systems use:
98 mm - 98.5 mm discs
These are compatible with:
Amann Girrbach
Roland
VHF
Imes-Icore
UP3D
Some systems also use:
95 mm discs (Zirkonzahn)
2. Most Common Thicknesses
Typical CAD/CAM acetal disc thickness:
Thickness Typical Use 12 mm thin frameworks 14 mm flexible clasps 16 mm partial frameworks 18 mm larger partial dentures 20 mm full flexible partial 22-25 mm full arch structures Many suppliers offer 12-25 mm range.
Most used in labs
16 mm
20 mm
24 mm
These allow milling a complete flexible partial framework.
3. Most Common Colors
Acetal discs come in many more colors than PEEK because the material is used for visible clasps and frameworks.
Most common tooth colors
Typical shades:
Shade Use A1 light teeth A2 most common A3 darker teeth A3.5 aged teeth C1 / C2 grayish teeth These are commonly sold in VITA shade system.
Full shade range available
Many manufacturers offer:
A1 - A4
B1 - B4
C1 - C4
D2 - D4
BL bleach shades
Some discs include 16 Vita shades plus additional colors.
Special colors
Color Use Pink gingival base Clear invisible retainers Bleach (BL) cosmetic cases 4. Most Sold Acetal Discs in Dentistry
In dental labs the most typical combination is:
98.5 mm x 16 mm x A2
Why:
fits most mills
matches majority of tooth shades
ideal for partial frameworks
5. Mechanical Properties (Compared to PEEK)
Property Acetal PEEK Flexural strength ~90 MPa ~150 MPa Flexibility High Medium Esthetics Tooth colored Ivory Clasp retention Good Moderate Rigidity Lower Higher Acetal is more flexible, which makes it ideal for clasps engaging undercuts.
6. Typical Dental Indications
Acetal discs are used for:
removable partial denture frameworks
flexible clasps
orthodontic retainers
night guards
provisional crowns
flexible dentures
implant retained removables
7. Design Thickness for Acetal Frameworks
Typical CAD design values:
Area Thickness Major connector 1.5 - 2.0 mm Clasps 1.0 - 1.3 mm Base 2 - 3 mm Because acetal is flexible, frameworks are usually thicker than metal frameworks.
8. Popular Acetal Brands
Common brands used in labs:
Perflex Acetal CAD
Zirlux Acetal
Dentokeep Acetal
Smile Acetal
Youdent Acetal
9. Milling Characteristics
Acetal mills very easily.
Typical burs:
3 mm roughing
2 mm
1 mm
0.6 mm finishing
Advantages:
low tool wear
fast milling
no sintering required
10. Market Price (Lab Level)
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