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Strain Gauge Evaluation of Transfer Impression Techniques of Multiple Implant-Supported Prosthesis
Renato Sussumu Nishioka1, Leandro Ruivo De Santis2, Gabriela Nogueira De Melo Nishioka3
1Professor, Department of Dental Materials and Prosthesis, São Paulo State University, ICT, UNESP, São José dos Campos, São Paulo, Brazil.
Purpose:
This in vitro study assessed the accuracy of multiple implant-level impression techniques (open tray and closed tray) for the fabrication of 3-unit implant prostheses with strain gauge (SG) analysis.
Materials And Methods:
A polyurethane master model was designed to simulate a clinical situation. Two rigid custom trays were fabricated for the model. The impression material used was polysulfide. Transfer implant impressions were made using 2 techniques; ten tapered copings not splinted (custom closed tray) and ten square copings splinted with acrylic-resin (custom open tray). The improved stone models were allowed to set for 1 hour before being separated from the impression. The superstructures were sprued, invested, and cast with a cobalt-chromium alloy. Four SGs were bonded on the surface of each polyurethane block.
Results:
A statistically significant difference was found between the 2 impression techniques tested (P = 0.000). This study found a significant average difference of 144.68 ± 5.53 με for open custom tray and 253.3 ± 16.7 με for closed custom tray.
Conclusion:
The custom open tray technique was the most accurate impression for multiple implants compared with closed custom tray.
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