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Comparative Study
. 2011 Nov;27(11):1119-26.
doi: 10.1016/j.dental.2011.08.004. Epub 2011 Sep 13.

Adaptation of all-ceramic fixed partial dentures

Márcia Borba  1 , Paulo F Cesar, Jason A Griggs, Álvaro Della Bona
Affiliations
Comparative Study

Adaptation of all-ceramic fixed partial dentures

Márcia Borba et al. Dent Mater. 2011 Nov.

Abstract

Objectives: To measure the marginal and internal fit of three-unit fixed partial dentures (FPDs) using the micro-CT technique, testing the null hypothesis that there is no difference in the adaptation between the ceramic systems studied.

Methods: Stainless steel models of prepared abutments were fabricated to design the FPDs. Ten FPDs were produced from each framework ceramic (YZ - Vita In-Ceram YZ and IZ - Vita In-Ceram Zirconia) using CEREC inLab according to the manufacturer instructions. All FPDs were veneered using the recommended 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-sections images. Five measuring locations were used as follows: MG - marginal gap; CA - chamfer area; AW - axial wall; AOT - axio-occlusal transition area; OA - occlusal area. The horizontal marginal discrepancy (HMD) was evaluated in another set of images. Results were statistically analyzed using ANOVA and Tukey tests (α=0.05).

Results: The mean values for MG, CA, AW, OA and HMD were significantly different for all tested groups (p<0.05). IZ exhibited greater mean values than YZ for all measuring locations except for AW and AOT. OA showed the greatest mean gap values for both ceramic systems. MG and AW mean gap values were low for both systems.

Significance: The ceramic systems evaluated showed different levels of marginal and internal fit, rejecting the study hypothesis. Yet, both ceramic systems showed clinically acceptable marginal and internal fit.

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Figures

Figure 1
Figure 1
A) Stainless steel models simulating prepared abutments; B) dimensions of the dies: 4.5 mm height, 6° of taper and 120° chamfer as finish line, 6.0 mm diameter in the marginal area and 3.1 mm diameter in the occlusal area.
Figure 2
Figure 2
Cross-section image of an IZ FPD in the mesio-distal direction.
Figure 3
Figure 3
Representation of the measuring locations: MG; CA; AW; AOT; OA.
Figure 4
Figure 4
A) Cross-section image of a crown in the bucco-ligual direction (x-axis). The white line indicates where the HMD was recorded. B) Cross-section image in the y-axis used to measure the HMD.
Figure 5
Figure 5
Gap dimensions (μm) for all measuring locations of both ceramic systems.
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