A Comparative Study of the Accuracy between Plastic and Metal Impression Transfer Copings for Implant Restorations

Abstract

The metal impression copings were more accurate than plastic copings when using the Straumann system, and there was no difference between metal and plastic copings for the Nobel Replace system. The system-by-screw location was not conclusive, showing no correlation within each system.

Accuracy Comparison of Implant Impression Techniques: A Systematic Review

“…Ten studies evaluate different coping types . From these, seven studies advocate the open technique with square copings as the most accurate, and three studies report similar results between copings .…”

“…From the 14 studies, none advocated the indirect (closed) technique. Although six of these studies reported similar results between both techniques, other sources of inaccuracy were identified other than the impression technique, such as angulation or coping shape …”

“…All the selected studies refer to in vitro studies. 4,5, Table 1 compares the accuracy between open and closed impression techniques, impression materials, and coping types, 5,17,[20][21][22][23][24][25]29,[32][33][34]36,38 20,21,25,29,[32][33][34]38 and 6 report similar results for both techniques. 5,17,[22][23][24]36 It was verified that a predominant use of square copings was associated to the open technique.…”

“…4,5, Table 1 compares the accuracy between open and closed impression techniques, impression materials, and coping types, 5,17,[20][21][22][23][24][25]29,[32][33][34]36,38 20,21,25,29,[32][33][34]38 and 6 report similar results for both techniques. 5,17,[22][23][24]36 It was verified that a predominant use of square copings was associated to the open technique. Table 2 compares the accuracy between splinted and non-splinted impression techniques, 4,[14][15][16]18,19,[27][28][29]31,37,[39][40][41] resuming the analysis of 14 articles, where all advocate the splinted technique.…”

“…27 Ten studies evaluate different coping types. [19][20][21][22][23][31][32][33]36,38 From these, seven studies advocate the open technique with square copings as the most accurate, 20,21,29,33,38 and three studies report similar results between copings. 22,23,36 In addition, four studies use plastic copings 17,22,29,36 and one of these also evaluates Snap-On impression copings, 22 finding similar results for this case as well.…”