Abstract
Statement of problem
Identical computer-aided design (CAD) parameters may be used to mill a variety of
ceramic materials for computer-aided design and computer-aided manufacture (CAD-CAM)
crowns. Whether milled crown spacing matches the designed parameters when more than
a single evaluation method is applied is unknown.
Purpose
The purpose of this in vitro study was to correlate the stereomicroscope and the microcomputer
tomography (μCT) 2-dimensional analysis of the cementation space with the replica
technique in assessing 3 different ceramic materials.
Material and methods
The specimens were milled in lithium disilicate, resin nanoceramic, and zirconia (n=30).
The cement space was measured at the marginal, axial, and occlusal regions. One hundred
twenty measurements of each material were used to correlate the methodologies. Data
were statistically evaluated with 2-way repeated measures ANOVA and the Tukey test
(α=.05). The Pearson correlation coefficient was used for each region for both methodologies
(μCT and optical microscopy) separately.
Results
For the μCT analysis, no differences were observed (P>.05) among the materials, but the axial region showed a positive correlation with
the marginal (r=0.957) and occlusal regions (r=0.349); the same was observed between the occlusal and marginal regions (r=0.338). However, for stereomicroscope evaluation, resin nanoceramic and zirconia
present similar cementation space (P=960), both being different from lithium disilicate (P<.05). The marginal region presented a positive correlation with axial (r=0.149) and occlusal regions (r=0.344), but the axial region showed negative correlation with the occlusal surface
(r=−0.205).
Conclusions
The measurements of the scanned replicas were accurate when thinner sections were
under measurement. Although the same space parameters were set in the CAD software
program, definitive internal dimensions varied among the milled crowns.
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Article info
Publication history
Published online: March 29, 2020
Footnotes
Supported by Research Foundation of the State of São Paulo – FAPESP grant # 2013/10021-5 and in part by The Coordenacao Aperfeicoamento de Pessoal de Nivel Superior, Brasil (CAPES) - Finance Code 001.
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
