Strain Gauge Evaluation of Transfer Impression Techniques of Multiple Implant-Supported Prosthesis
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Data
2018-04-01
Autores
Nishioka, Renato Sussumu [UNESP]
De Santis, Leandro Ruivo [UNESP]
De Melo Nishioka, Gabriela Nogueira [UNESP]
Kojima, Alberto Noriyuki [UNESP]
Souza, Francisley Avila [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Lippincott Williams & Wilkins
Resumo
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 acrylicresin (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 mu epsilon for open custom tray and 253.3 +/- 16.7 mu epsilon 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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Palavras-chave
dental prosthesis, biomechanics, dental implants
Como citar
Implant Dentistry. Philadelphia: Lippincott Williams & Wilkins, v. 27, n. 2, p. 188-192, 2018.