Various factors have been attributed for the success of the implant and impression material and the technique is one of which is considered very crucial and important criteria in the success of fabrication and long lasting of the restoration. A dental impression is a negative imprint of an oral structure used to produce a positive replica of the structure for use as a permanent record or in the production of a dental restoration or prosthesis. Since the accuracy of the impression affects the accuracy of the definitive cast, an accurate impression is essential to fabricate prosthesis with good fit. An inaccurate impression may result in prosthesis misfit, which may lead to mechanical and/or biological complications.
A major objective of fabricating implant-supported restorations is the production of super-s...
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...me screw and closed tray technique practitioners believe that it is more reliable as visual fastening of the analog to the coping is more accurate and the disadvantage associated with this technique is there are parts to be controlled when fastening and rotational movement of the impression coping when securing the implant analog(Carr AB 1991).
Closed tray technique is indicated when the patient has limited inter arch space, gagging tendency or difficult to access the implant in the posterior region (Liou AD et al 1993). This technique uses a single piece impression coping that remains attached intra orally to the implant when the impression is removed. Impression using the closed and open tray technique on the angulated abutments and the number of implants are of little interest as no difference has been seen in between the two techniques (Conrad KJ et al 2007).
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