Evaluation of the influence of the accelerated artificial aging and storage in 1.23% acidulated phosphate fluoride over superficial roughness and color stability of two low-fusing dental ceramics to commercially pure titanium / Avaliação da influência do envelhecimento artificial acelerado e armazenamento em fluorfosfato acidulado a 1,23% na rugosidade superficial e na alteração de cor de cerâmicas odontológicas de ultra-baixa fusão para titânio comercialmente pur

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The purpose of this study was to evaluate the influence of accelerated artificial aging and of 1.23% acidulated phosphate fluoride over superficial roughness and color stability of two low-fusing dental ceramics for titanium (Triceram- Dentaurum, and Noritake Ti22- Noritake), metal-free or metalceramics using commercially pure titanium (Tritan- Dentaurum). 80 cylindrical samples, with 15mm of diameter and 2.5mm of thickness, being 40 for each ceramic, 20 metal free and 20 metal-ceramics, which were divided into two groups of 10 samples, being submitted to the accelerated artificial aging (System Accelerated of Aging for not-metallic C-UV - Comexim Raw materials Ltda, São Paulo, Brazil) or storage in 1.23% acidulated phosphate fluoride. Superficial roughness was accomplished by roughness tester SJ - 201P (Mitutoyo, Tokyo, Japan) in two moments: initial measured after obtained the samples and final superficial roughness after the accelerated artificial aging or storage in 1.23% acidulated phosphate fluoride. Color changes were analyzed by a spectrophotometer PCB 6807 BYK GARDNER (Columbia, United States). The average results and standard deviations for the metal free over accelerated artificial aging were: a) superficial roughness: Triceram before 0.390 ± 0.097, after 0.431 ± 0.100; Noritake Ti22 before 0.299 ± 0.075, after 0.312 ± 0.076; b) color evaluation: Triceram 0.28 ± 0.14; Noritake Ti22 0.33 ± 0.22; and for samples submitted to the storage in 1.23% acidulated phosphate fluoride were: a) superficial roughness: Triceram before 0.325 ± 0.036, after 2.199 ± 0.889; Noritake Ti22 before 0.317 ± 0.094, after 2.760 ± 0.833; b) Color evaluation: Triceram 5.39 ± 0.61; Noritake Ti22 7.31 ± 0.71. The data were submitted to ANOVA and Duncan statistics analysis to p ≤ .05. The obtained results showed that the accelerated artificial aging simulating ten years of clinical use of the restoration did not affect the superficial roughness of none of the evaluated ceramics, in no group; which only the group of the Triceram with substructure in commercially pure titanium revealed values statistically greater than the rest, revealing that the accelerated artificial aging influenced the color of this group. However, the values of color alteration was smaller than 1, being considered clinically acceptable ; which after the storage in 1.23% acidulated phosphate fluoride was observed increased values of superficial roughness with significant difference between both studied ceramics, as in metal-free samples as in metal-ceramics; which the color alteration, after storage in 1.23% acidulated phosphate fluoride, revealed to all the groups evaluated unacceptable values clinically (ΔE >3.3).

ASSUNTO(S)

envelhecimento artificial acelerado accelerated artificial aging cerâmica odontológica titânio comercialmente puro commercially pure titanium dental ceramic alteração de cor fluorfosfato acidulado color stability acidulated phosphate fluoride

ACESSO AO ARTIGO

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