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Silicone impression material consists of a base and catalyst in a putty consistency. Silicone impressions are classified according to their method of polymerisation on setting. They are available in a range of viscosities including light, medium, heavy and very high viscosity (or putty) material.

Developing and distributing world class dental PVS impression materials to dental and orthodontic offices, and to sleep apnea and TMJ specialists in all 50 states. 

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Silicone impression material consists of a base and catalyst in a putty consistency. Silicone impressions are classified according to their method of polymerisation on setting. They are available in a range of viscosities including light, medium, heavy and very high viscosity (or putty) material. When taking a putty impression it is usually combined with a low viscosity silicone. This is also known as the putty wash technique. Putties were developed initially to reduce the shrinkage of condensation silicones. There are three ways of recording a putty wash impression:

• One-stage impression – putty and wash are recorded simultaneously.
• Two-stage un-spaced impression – putty impression is recorded first and after it has set it is relined with a thin layer of wash material.

Two stage spaced impression – a space is created for the wash. This space may be made by:

• Using a polythene spacer over the teeth prior to making the putty impression.
• Recording the putty impression before the tooth preparation.
• Scooping away the putty and providing escape channels for the wash.

The most effective way of recording a putty wash impression is to use the one-stage technique in a rigid metal tray.

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To support my research on impression materials we asked two dentists their opinions on the different impression materials:

"Silicones are the most dimensionally stable of all the materials and will keep their shape even if left for long periods. However, silicones work best in a dry environment and may not be ideal if there is a lot of saliva. Alginate is flexible and flows well. This allows the impression material to record fine surface detail. However, alginate does have poor dimensional stability and will distort if left to dry or left in water". - Dr. Harry Sugg

"Alginate is the cheapest and most commonly used impression material. It is versatile and useful for denture work, opposing impressions for crown and bridge work and removable orthodontic appliances. Alginate is not as accurate as silicone and is prone to distortion if not kept damp. Silicone has different grades of thickness and is often used where more accurate work is required. It is commonly used for taking impressions for crowns, bridges, short term braces and fixed retainers. The heavier silicone can be used to record the area approximately and the lighter ('runnier') silicone can then be used to record the finer detail, giving a really accurate impression". - Dr. Paul Serrano

The differences between impression materials, as outlined above, are the materials themselves and the purpose they are used for. Each of the materials has advantages and disadvantages, but they are each used for a different purpose and are effective and commonly used products in dentistry today. Don't miss out on this GREAT PRODUCT!