Inadequate margin coverage with light impression material: if you use the one-pass technique, avoid high viscosity contrast between the tray and the fluid material.The factors mentioned above, such as insufficient retraction, contamination with oral cavity fluids, excessive working time and material with low tear strength, interfere with the complete reproduction of the preparation margins. Inhibited layers caused by other dental materials: temporary cements and acrylics present in temporary or core build-up materials can inhibit the polymerisation of impression materials, therefore the inhibited layer of these materials should be completely removed prior to taking the impression, ensuring that no residue is left behind.Inhibition of polymerisation of VPS impression materials by mixing with latex gloves: to avoid this, the recommendation is to use gloves that do not contain sulphur, a good option are nitrile gloves.The preparation should be thoroughly rinsed and dried prior to taking the impression. Inhibition of polymerisation by using acidic shrink materials or hemostatic agents: Acids and hemostatic agents such as aluminium or ferrous salts may cause inhibition of polymerisation of the impression materials.With Impregum by 3M, a polyether-based material, you will be ready to achieve these perfect margins: ![]()
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