Abstract
Objective: This in vitro study aimed to determine and compare the dimensional accuracy of open and closed-tray impression techniques for implant-supported prosthesis. Material and Methods: On a edentulous master model, four external hexagonal implants were parallelly installed and associated with four multi unit coping transfers and four multi unit rotational caps. A master superstructure was constructed and splinted all implants (control group). Five customized trays were constructed to perform ten open (n=5) and closed-tray (n=5) impressions. The obtained models were submitted to the dimensional analysis on three points in the center of the labial face of each implant (A, B, C, and D) with the aid of Stereoscopic Magnifying Glass with x60 magnification. The vertical misfit between the metallic structure and the implant analogues was measured on each point. The obtained results were submitted to Dixon’s normality test and Kruskal-Wallis test for independent samples (p < 0,05) with the aid of Bioestat 5.0 software. Results: The means and standard deviation were: open tray technique – 24.6474 ± 14.8883 µm; closed-tray technique – 26.2257 ± 9.7421 µm; and control group 22.445 ± 7.7106 µm. Conclusion: The accuracy of open and closed-tray impression techniques showed no statistically significant differences and both techniques were effective for implant transfer.
Highlights
The appearance of Implantodontics and the use of osseointegrated implants positively contributes to the oral rehabilitation of edentulous individuals [1,2,3,4,5,6], employing plausible methodologies with constant increasing in scientific area
Even knowing that the absolute passive adaptation of the implant-supported prosthesis is very difficult to be clinically achieve in partial or total edentulous individuals [5,7,10,1316], it is possible to decrease the dimensional alterations that affect the precision by controlling the steps of: construction of the implant superstructure [4,7,10,11,13,14,15,16], handling of the impression material [1,2,13], and implant transfer impression technique [23,5,7,9,10,11,13,14,15,16]
A natural tooth can move above 100 μm inside the periodontal ligament and the tooth displacement is compensated by installing a fixed partial prosthesis
Summary
The appearance of Implantodontics and the use of osseointegrated implants positively contributes to the oral rehabilitation of edentulous individuals [1,2,3,4,5,6], employing plausible methodologies with constant increasing in scientific area. This is a simpler and faster, but less accurate procedure that is indicated in cases with one/two implants in individuals with limited mouth opening and/or marked vomiting reflex; or in situations in which not enough space is available to access the transfer copings; or in the presence of angulated implants [3,5,8,12,17,18,19,20,21,22,27,28] This in vitro study aimed to determine and compare the dimensional accuracy of open and closed-tray implant transfer impression technique for implant-supported prosthesis. The hypotheses are: (1) the open-tray technique is more accurate than closed-tray technique; (2) the closed-tray technique is more accurate than open-tray technique; and (3) both techniques have similar accuracy in implant transfer technique
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