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In model 1, all implants were placed in parallel; in models 2 and 3, anterior implants were buccally inclined and posterior implants were distally inclined in 10- and 20-degrees, respectively. Three different impression copings (hexed, non-hex, multi-unit) and two different impression techniques (splinting and non-splinting) were tested. A total of 180 impressions (<jats:italic>n<\/jats:italic>\u2009=\u200910 per group) were made using mono-phase vinyl poly-siloxane. Master models and duplicate casts were scanned by a 5-axis laboratory scanner and data were transferred to a software program for the alignment of master and duplicate copings. Coronal and angular deviations were calculated, and data were statistically analyzed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>For angulated models, the lowest deviation values were detected at the splinted non-hex coping group (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Implant angulation, impression coping type, and splinting the impression copings had significant effects on the accuracy of impressions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Trial registration<\/jats:title><jats:p>Not applicable.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s13005-020-00225-3","type":"journal-article","created":{"date-parts":[[2020,5,4]],"date-time":"2020-05-04T06:02:19Z","timestamp":1588572139000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Comparison of the accuracy of different impression procedures in case of multiple and angulated implants"],"prefix":"10.1186","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6355-7696","authenticated-orcid":false,"given":"M. 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