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The International Journal of Prosthodontics
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Int J Prosthodont 29 (2016), No. 5     16. Sep. 2016
Int J Prosthodont 29 (2016), No. 5  (16.09.2016)

Page 467-472, doi:10.11607/ijp.4777, PubMed:27611750


The Effect of Edentulous Maxillary Impression Tray Designs When Flabby Tissue Is Present: An In Vitro Study
Shin, Jae-Ok / Huh, Yoon-Hyuk / Cho, Lee-Ra / Park, Chan-Jin
A model with simulated flabby tissue was fabricated by modifying the standard maxillary edentulous acrylic resin cast to evaluate the effect of maxillary impression tray design on the displacement of flabby tissue. Seven groups of trays were fabricated using different combinations of relief spaces and escape holes. After impression taking, test and control casts were scanned and three-dimensional digital models were superimposed. Negative deviations were recorded at the point of the alveolar crest, the posterior part of the flabby tissue, and the middle of the palate, while positive deviations were recorded at the point of the anterior part of flabby tissue. The amount and characteristics of tissue displacement differed with tray design and the relief method used.