Dentistry

Vertical misfit of implant-supported infrastructures after different implant transfer impression methods

20^th Annual World Dental Summit

March 20-22, 2017 Rome, Italy

Bruna Santos Honorio Tonin

University of Sao Paulo, Brazil

Posters & Accepted Abstracts: Dentistry

Abstract:

Objective: Aim of this study is to evaluate the passivity and vertical misfit of implant-supported fixed partial prosthesis (FPD) infrastructures after different transfer impression methods. Methods: A master model containing a first premolar and two implants (3.75x7 mm) was fabricated to replace the second premolar and first molar and, on these implants, mini conical abutments were screwed (32 N.cm). Eight metal infrastructures were obtained by conventional casting to have the passivity and vertical misfit evaluated in three different groups according to the following transfer impression used. Impression transfer posts screwed to the mini conical abutments (G1, n=8), implants (G2, n=8) and mini conical abutment cylinder (G3, n=8, experimental group); all connected together with acrylic resin. The master model was used with control group (G4). Passivity (screwed molar and loose premolar) and vertical misfit (screwed molar and premolar) were evaluated between the mini conical abutment and the metal infrastructure at 12 different points around the abutment (three points for each face�??buccal, lingual, mesial and distal) by the Sheffield method. Results: Passivity analysis on the loose premolar showed lower misfit in G3 (55.51±28.57 μm) and G4 (17.05±6.80 μm), both similar to each other (p>0.05) and G1 (135.53±54.84 μm) and G2 (127.21±34.11 μm) were associated with higher misfits. Likewise, G1 (9.37±3.57 μm) had the highest vertical misfit (screwed molar and premolar) when compared to the other groups. In addition, G3 (5.59±0.94 μm) was statistically similar to G4 (4.95±0.82 μm, control group). Conclusion: Within the limitations of this study, it can be concluded that transfer molding after screwing the mini conical abutments were associated with higher vertical misfits. Additionally, the experimental transfer impression method (mini conical abutment cylinder) was the most effective in all analysis (passivity and vertical misfit) with control group (master model).

Biography :

Email: bruna.tonin@usp.br