Abstract
Statement of problem
Although the 2D analysis of prosthesis cementation space has been popular, its correlation
with volumetric comparison (3D data) of cement space is unclear.
Purpose
The purpose of this in vitro study was to evaluate the cement space in computer-aided
design and computer-aided manufacturing (CAD-CAM) crowns of different materials and
correlate 2D measurements of cement space with their corresponding 3D values (volume
of cement space) by using microcomputed tomography (μCT) analysis of regions of interest.
Material and methods
Ten molar crowns were milled in lithium disilicate (LD), resin nanoceramic (RN), and
zirconia (Z) ceramics. Silicone replicas were produced and used as the analog cement
layer and scanned with a desktop X-ray microfocus CT scanner. Twenty-eight slices
were evaluated in 3 regions: marginal, axial, and occlusal (n=84 measurement points/specimen).
After 3D reconstruction of the cement space, the volume was calculated. Data were
statistically evaluated through 2-way ANOVA and Bonferroni test (α=.05). The Pearson
correlation test was used to investigate the correlation between the 2D and 3D data.
Results
The volumes of the occlusal (LD 10 ±1 mm3; RN 9 ±1 mm3) and axial regions (LD 9 ±2 mm3; RN 8 ±1 mm3) were significantly higher than the volume of the marginal region for LD and RN specimens
(LD 6 ±2 mm3; RN 4 ±1 mm3) (both P<.001). For the Z group, the axial region had the highest volume (19 ±2 mm3), followed by the volumes of the occlusal (15 ±1 mm3) and marginal regions (12 ±1 mm3). The Pearson correlation test determined a moderate positive correlation of the
marginal area (r=0.606, P<.001) and of the axial region (r=0.588, P<.001). However, a moderate negative correlation was found between volume and thickness
of the occlusal area (r=-0.437, P=.016).
Conclusions
Z showed more volume of cement space, as well as thicker cement space than LD and
RN. The μCT analysis is an efficient method of analyzing cement thickness and volume
in ceramic crowns at the selected regions of interest. A moderate positive correlation
was found between the 2D and 3D analyses for the axial and marginal regions of ceramic
crowns.
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Article info
Publication history
Published online: March 06, 2021
Footnotes
Supported by Research Foundation of the State of São Paulo – FAPESP grants # 2013/10021-5, # 2012/19078-7, # 2016/01921-0, and in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil (CAPES) – Finance Code 001, and the Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil (CNPq) # 304589/2017-9 and 434487/2018-0
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