Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology
AUTOR(ES)
Borba, Marcia, Miranda Jr., Walter Gomes, Cesar, Paulo Francisco, Griggs, Jason Allan, Bona, Alvaro Della
FONTE
Braz. oral res.
DATA DE PUBLICAÇÃO
2013-09
RESUMO
The objective of the study was to measure the marginal and internal fit of zirconia-based all-ceramic three-unit fixed partial dentures (FPDs) (Y-TZP - LAVA, 3M-ESPE), using a novel methodology based on micro-computed tomography (micro-CT) technology. Stainless steel models of prepared abutments were fabricated to design FPDs. Ten frameworks were produced with 9 mm2 connector cross-sections using a LAVATM CAD-CAM system. All FPDs were veneered with a compatible porcelain. Each FPD was seated on the original model and scanned using micro-CT. Files were processed using NRecon and CTAn software. Adobe Photoshop and Image J software were used to analyze the cross-sectional images. Five measuring points were selected, as follows: MG - marginal gap; CA - chamfer area; AW - axial wall; AOT - axio-occlusal transition area; OA - occlusal area. Results were statistically analyzed by Kruskall-Wallis and Tukey's post hoc test (α= 0.05). There were significant differences for the gap width between the measurement points evaluated. MG showed the smallest median gap width (42 µm). OA had the highest median gap dimension (125 µm), followed by the AOT point (105 µm). CA and AW gap width values were statistically similar, 66 and 65 µm respectively. Thus, it was possible to conclude that different levels of adaptation were observed within the FPD, at the different measuring points. In addition, the micro-CT technology seems to be a reliable tool to evaluate the fit of dental restorations.
Documentos Relacionados
- Evaluation of physicochemical properties of root-end filling materials using conventional and Micro-CT tests
- Micro-CT Evaluation of Root Filling Removal after Three Stages of Retreatment Procedure
- Micro-CT assessment of two different endodontic preparation systems
- In vitro evaluation of the retention of zirconia-based ceramic posts luted with glass ionomer and resin cements
- Micro-CT evaluation of the radioprotective effect of resveratrol on the mandibular incisors of irradiated rats