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. 2019 Aug 1;11(8):e707-e712.
doi: 10.4317/jced.55588. eCollection 2019 Aug.

Impact of design and length on the accuracy of closed tray transfer copings

Elena Roig  1 , Natalia Álvarez-Maldonado  1 , Luis-Carlos Garza  1 , Marta Vallés  1 , José Espona  1 , Miguel Roig  1
Affiliations

Impact of design and length on the accuracy of closed tray transfer copings

Elena Roig et al. J Clin Exp Dent. .

Abstract

Background: The aim of this study was to evaluate the accuracy of two closed-tray transfer copings for implant impressions (a new design vs. an old design) in two different lengths (short and long).

Material and methods: Four groups of transfer copings (NS - new short, NL - new long, OS - old short and OL - old long) were tested. An epoxy resin model was prepared of missing teeth 1.4, 1.5 and 1.6. Two Alpha-Bio analogues were placed in position of teeth 1.4 and 1.6, at a 10o angulation. Two calibrated operators took 10 closed-tray impressions for each group with polyether in a Rim-Lock impression tray.

Results: After measuring and comparing impressions, a significant difference was found between the two new transfer copings and the old short transfer coping.

Conclusions: The new transfer coping design significantly improved impression accuracy. An adequate transfer coping design for the closed-tray impression technique can help to achieve clinically acceptable impressions for two-unit implant supported bridges. Key words:Closed tray, impression coping, transfer coping, implant impression.

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Conflict of interest statement

Conflict of interest statement:The authors have declared that no conflict of interest exist.

Figures

Figure 1
Figure 1
Main view of the two different implant transfers (green is the “old”, silver is the “new”) in short and long lengths.
Figure 2
Figure 2
A plane was sketched on top of the cylinder and was then moved 10 mm apically along the length of the scan body. The centroid was determined by intersection of the apically moved plane and the axis of the scan body.
Figure 3
Figure 3
The center of the implant head and the axis of the scan body (which is the same as the implant axis) is determined.
Figure 4
Figure 4
Means and 95% LSD intervals for the difference between the center of the two implants in the test model and the difference between the center of the two implants in the reference model in the four transfer coping types. Value “0” corresponds to the reference value. There is significant difference between groups NS and OS and between groups NL and OL. There is not significant difference between the other groups.
Figure 5
Figure 5
Box-and-Whisker Plot showing the distance between the two implants centre in all groups. Each value is the difference between the measurement in the test model and in the reference model. Value “0” corresponds to the reference value.
Figure 6
Figure 6
Angle between the two implants axis in the reference model and in the test model. There is significant difference according to means and 95% LSD intervals. New and old transfer copings are grouped. Value “0” corresponds to the reference angle.
See this image and copyright information in PMC

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