Dimensional Accuracy Of Dental Casts Using Various Impression Methods

After the completion of tooth preparation an accurate impression is essential for fabrication of a precise fixed partial denture. Numerous studies have been conducted to assess the efficacy of different impression materials and various impression techniques that are widely used in contemporary fixed prosthodontics.Among the myriad of various impression materials there is a wide spread consensus and acceptance of addition silicon elastomers among clinicians for accurate impression making. Several techniques have been suggested to improve the accuracy of poly vinyl siloxane (PVS) impressions among clinicians. The most commonly used putty-wash impression techniques are - single step technique putty-wash double stage technique and putty wash double stage technique with polyethylene spacer. Furthermore the thickness of the wash material is an essential factor that influences the accuracy of elastomeric materials.