الفهرس 
Effect of impression techniques on the vertical marginal gap distance of implant superstructures materials
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Abstract
Purpose: The purpose of the study wasevaluating the effect of different impression techniques (at the implant level) on the vertical marginal gap distance of implant superstructures using two different elastomeric impression materials (poly vinyl siloxane and polyether). Materials and methods: A dentate mandibular model used in this study as a standard master model for all impressions simulating free end saddle case (Kennedy classII edentulous ridge).Thermoplastic vinyl surgical template formed over the model. Two implants3.7mm, 4.3mm diameter used for second premolar, second molar. Custom trays fabricated using autopolymerizing acrylic resin 24 hours before impression procedures. Impression materials (poly vinyl siloxane, polyether) used with closed tray and open (non-modified, sandblasted and adhesive coated, splinted copings with duralay) tray impression techniques. Metal framework placed on the abutments after pouring the casts. The vertical marginal gap distance measured for each stone cast using the stereomicroscope