Surface roughness and volumetric contraction of a Y-TZP ceramic sintered by microwave energy and by resistive heating
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2017
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Brazilian Dental Science
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Objectives: The aim of this study was to evaluate
a Y-TZP ceramic sintered by a microwave protocol
on volume shrinkage and surface roughness.
Material and Methods: Twenty four (N=24)
Y-TZP discs were fabricated by milling in CAD/
CAM for size standardization. The mean final
dimensions of the specimens were 15 mm X 1.6
mm. Samples were divided into 2 groups (n=12):
conventional resistive heating sintering protocol
(C - Control) and microwave sintering protocol
(MO - experimental). For the characterization
of the specimens, surface roughness (Ra and Rz
parameters) was evaluated with a roughness tester,
and volume shrinkage was measured with a hand
micrometer. Data were statistically evaluated by
Student’s t and Mann-Whitney U tests (α=0.05).
Results: The roughness results were: 0.25 μm ±
0.02 (Ra) and 2.68 μm ± 0.666 (Rz) for the MO
samples; 0.26 μm ± 0.04 (Ra) and 2.73 μm ±
0.461 (Rz) for the C group (Ra: p = 0.19; Rz: p
= 0.81). The shrinkage results was: MO (21.02%
± 2.70) and C (20.10% ± 0.52) (p = 0.274).
Conclusion: The conventional and microwave
sintering methods were similar regarding surface
roughness and volume shrinkage of Y-TZP dental
ceramic.
Como referenciar
BARCHETTA, NAYARA; NANNI, LARISSA; MIRANDA, JEAN; LAZAR, DOLORES; ASSUI, VALTER; SAAVEDRA, GUILHERME. Surface roughness and volumetric contraction of a Y-TZP ceramic sintered by microwave energy and by resistive heating. Brazilian Dental Science, v. 20, n. 04, p. 124-129, 2017. DOI: 10.14295/bds.2017.v20i4.1481. Disponível em: http://repositorio.ipen.br/handle/123456789/28538. Acesso em: 22 Feb 2025.
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