Polymerization dental flask

plastic

Short description
Transparent, airtight muffle for vacuum UV polymerisation in the absence of oxygen. Accessory for oxygen-free UV polymerisation of composites and post-curing of 3D resin prints. Connect to a vacuum pump and operate the blue valve to create a vacuum and hermetically seal the chamber for several hours. When placed in a UV oven, it enables curing in a controlled atmosphere.

Advantages
COMPOSITES

• Elimination of the tacky surface (Oxygen Inhibited Layer or OIL)
• Increased biocompatibility
• Improved colour stability
• Increased strength and surface hardness

3D PRINTING

• Elimination of the tacky surface, saving time
• Increased biocompatibility when using technical or dental resins
• Higher flexural strength
• Higher hardness

Advantages of vacuum polymerisation for composites
Vacuum polymerisation significantly improves properties of dental composites by removing oxygen from the polymerisation chamber, allowing a higher and more uniform degree of conversion.

• Elimination of the oxygen inhibited layer: oxygen interferes with radical polymerisation and prevents full cure at the surface; vacuum removes oxygen and enables polymerisation up to the surface.
• Increased degree of conversion (DC): vacuum, especially when combined with heat (thermal post-curing), enhances mobility of residual monomers and increases conversion of C=C bonds, improving biocompatibility and colour stability.
• Reduced internal porosity and removal of trapped bubbles: negative pressure extracts micro-bubbles formed during mixing or layering, reducing stress concentration and the risk of cohesive failure.
• Optimised mechanical properties: increases elastic modulus, surface hardness, flexural and compressive strength, and wear resistance.
• Control of polymerisation shrinkage stress: when used for indirect laboratory restorations, shrinkage stress can be transferred to the model rather than to the tooth, reducing postoperative sensitivity and marginal micro-gaps.

Advantages of vacuum polymerisation for polymers / 3D prints

• Elimination of the oxygen inhibited layer: guarantees a dry, clean and smooth surface without the tacky layer typical of air curing.
• Higher mechanical resistance: absence of oxygen allows denser polymer chains and improved flexural strength and hardness.
• Improved biocompatibility: reduces residual unreacted monomers on the surface, important for technical and dental resins.
• Reduced cost and complexity compared to vacuum ovens with sealed chambers: the muffle enables vacuum post-curing inside a standard UV oven that operates in open air.

Technical characteristics / specifications

• Type: transparent, airtight muffle (flask) for vacuum UV polymerisation
• Primary uses: oxygen-free UV polymerisation of dental composites; post-curing of 3D resin prints (SLA, DLP, LCD)
• Connection: designed to be connected to a vacuum pump; operated via a blue valve
• Sealing: hermetic vacuum chamber capable of maintaining vacuum for several hours
• Compatibility: can be placed inside a UV oven operating in open air for controlled-atmosphere curing
• Key benefits: elimination of oxygen inhibited layer (OIL), increased degree of conversion, reduced porosity and trapped bubbles, improved mechanical properties (hardness, flexural strength, wear resistance), improved colour stability and biocompatibility
• Workflow advantage: reduces the need for expensive vacuum ovens by enabling vacuum post-curing inside standard UV ovens