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Acetal Resin

Acetal is a semi-flexible, tooth-colored material ideal for partial denture frameworks and other metal free removable applications. This highly crystalline acetal copolymer possesses high tensile and flexural strength, fatigue resistance, low friction, low moisture absorption, and excellent dimensional stability.

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  • Acetal is a semi-flexible, tooth-colored material ideal for partial denture frameworks and other metal free removable applications. This highly crystalline acetal copolymer possesses high tensile and flexural strength, fatigue resistance, low friction, low moisture absorption, and excellent dimensional stability.

  • Acetal is a 99.9% pure, highly crystalline millable thermoplastic. What makes this copolymer special is that this material is flexible when thin, but becomes more rigid as it becomes thicker, making it an ideal material for fabricating a variety of tooth-retained removable appliances.

  • The material absorbs virtually no water, delivering long-lasting performance and making it less likely to develop stains or odors. Think of Acetal like a much-improved PMMA, but stronger and more flexible than PMMA. Acetal allows you to make a thinner, more flexible appliance, and it can engage natural undercuts in teeth for maximum retention and patient comfort.

  • Acetal has been used in dentistry worldwide successfully for decades in injectable form. Now this super-material comes in millable form: acetal mills cleanly and quickly (dry or wet), so you can take advantage of unused capacity in your CAM machines. With the high predictability, a digital workflow gives esthetic, excellent fitting, and durable removable appliances at a great value.

  • Because acetal is colored like a natural tooth, it is more esthetic than metal when used for clasps. Having an easily milled material, one can CAD a delicate partial denture frame and mill it in most dry 5-axis mills. According to research, patients are twice as likely to lose the tooth adjacent to a partial denture as any other tooth. However, because acetal is much more flexible than Co-Cr, it is kinder to adjacent teeth. Lastly, using acetal is much less labor intensive compared to fabricating denture frameworks from cast metal (due to cast metal requiring so many steps to create, as well as all of the chemical reactions it causes that can play havoc with accuracy and fit). When moving to milling acetal and its all-digital workflow, these problems are dramatically reduced.

  • High tensile and flexural strength

  • Fatigue resistance

  • Low friction

  • Low moisture absorption

  • Excellent dimensional stability

Minimum Thickness Requirements

Partial denture framework – Major connector 0.7 mm
Partial denture framework – Saddle area 0.5 mm
Clasp on anterior tooth 2.0 mm where clasp joins framework
Thinning to 0.7 mm at tip
Clasp on posterior tooth 2.5 mm where clasp joins framework
Thinning to 0.7 mm at tip

 

Photo Credits: Duracetal

Indications

  • Partial denture framework

  • Provisional crown & bridge

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