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Vertical Microgap and Passivity of Fit of Three-Unit Implant-Supported Frameworks Fabricated Using Different Techniques.

Authors :
Massignan Berejuk, Halina
Hideo Shimizu, Roberto
Aparecida de Mattias Sartori, Ivete
Valgas, Laiz
Tiossi, Rodrigo
Source :
International Journal of Oral & Maxillofacial Implants; 2014, Vol. 29 Issue 5, p1064-1070, 7p, 4 Color Photographs, 1 Chart, 1 Graph
Publication Year :
2014

Abstract

Purpose: This study compared the vertical microgaps of milled zirconia and cobalt-chromium (Co-Cr) implant-supported fixed dental prosthesis frameworks to those seen in one-piece frameworks cast with different techniques. Materials and Methods: Two threaded implants were used to simulate the rehabilitation of a maxillary partially edentulous space from the second premolar to the second molar. Three-unit screw-retained prosthetic frameworks were fabricated and divided into the following groups (n = 10 in each group): 1 = cast in Co-Cr using burnout cylinders; 2 = cast in Co-Cr using cast-on Co-Cr cylinders; 3 = one-piece cast in Co-Cr using a passive fitting technique; 4 = milled Co-Cr framework; 5 = milled zirconia framework. The microgap was measured under an optical microscope at ×25. Readings were made with one screw tightened and with both screws tightened. Data were submitted to statistical analysis to enable comparison between groups (α = .05). Results: All frameworks presented microgaps less than 70 μm under all reading conditions, except for group 1 with the readings made on the side opposite the tightened side (124.22 μm). With one screw tightened, the microgap on the tightened side was significantly smaller in groups 2, 3, and 4. On the opposite side, groups 3, 4, and 5 presented significantly smaller microgaps compared to the other groups. When both screws were tightened, the microgap was significantly smaller in groups 2, 3, and 4. Conclusion: One-piece cast frameworks associated with a passive fitting technique and milled Co-Cr frameworks presented smaller microgaps than the other fabrication methods and materials that were tested. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08822786
Volume :
29
Issue :
5
Database :
Complementary Index
Journal :
International Journal of Oral & Maxillofacial Implants
Publication Type :
Academic Journal
Accession number :
98418548
Full Text :
https://doi.org/10.11607/jomi.3421