Implant impression techniques: A review article

The reproduction of superstructures that exhibits the best passive fit when connected to multiple abutments is one of the major objectives in making implant supported prosthesis. Taking accurate impression is the most important requirement in order to ensure passive fit. The aim of this study was to review selected databases in search of journal articles describing the best implant impression techniques or their modifications that can increase the accuracy of the impression and finally a passive supra-structure reproduction. Language restriction was applied in order to select articles in English language only. Based on our strategy, search started from Cochrane Oral Health Group’s Trials Register, followed by searching PubMed and Medline databases. Hand searching was conducted for several dental journals. We checked the bibliographies of relevant clinical trials and review articles in search of studies that may not have been included in those hand searched journals. Several implant manufacturers’ product catalogues as well as their instruction manuals were searched for relevant information. A total of 92 articles were identified. Twelve of them were case-report articles that presented modified techniques. Another 50 presented detailed statistical comparison and were suitable for inclusion in this review. No RCT and Meta analysis papers were identified. Based on the reviewed articles it can be suggested that: Direct or open tray technique is more accurate procedure than indirect or close tray technique for duplicating oral conditions in the master cast. Polyether and polyvinylesiloxane (PVS) impression materials are more suitable for taking impression of dental implants. In case of multiple implants, splinted technique showed no advantages over non splinted techniques.