PubMed · 4574328
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K Michaeli. 1973-05-10. [Impression using a ring].. https://pubmed.ncbi.nlm.nih.gov/4574328/
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Using the provisional restoration as a testing ground to increase the predictability of a final restoration is well understood. With the resolution of issues through a well-developed provisional restoration comes the challenge of duplicating its contours in the final prosthesis. A method is described using elastomer impression putty and a molten wax technique by which the contours of a provisional anterior fixed partial denture can be duplicated. The described method is particularly useful when the replication of a specific irregular tooth arrangement is mandated.
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A method of using light-cured acrylic resin as an alternative to the use of chemically-cured acrylic resins with elastomeric impressions for direct post patterns is presented. The GC Unifast LC acrylic resin is a powder/liquid type resin cured by exposure to visible light. The polymerization process has four stages before final curing: slurry, stringy, dough-like (plastic), and rubber-like (elastic). Advantages over current direct and indirect procedures include ease of manipulation of the material and no change in laboratory handling procedures. While in the dough-like state, the material can be contoured. In the rubber-like state, it is flexible to disengage from minor undercut areas.