Microhardness and fluoride release of restorative materials in different storage media
Braz. dent. j
; 18(4): 309-313, 2007. ilus, tab
Article
Dans En
| LILACS
| ID: lil-474470
Responsable en Bibliothèque :
BR1.1
ABSTRACT
This study evaluated the surface microhardness and fluoride release of 5 restorative materials - Ketac-Fil Plus, Vitremer, Fuji II LC, Freedom and Fluorofil - in two storage media distilled/deionized water and a pH-cycling (pH 4.6). Twelve specimens of each material, were fabricated and the initial surface microhardness (ISM) was determined in a Shimadzu HMV-2000 microhardness tester (static load Knoop). The specimens were submitted to 6- or 18-h cycles in the tested media. The solutions were refreshed at the end of each cycle. All solutions were stored for further analysis. After 15-day storage, the final surface microhardness (FSM) and fluoride release were measured. Fluoride dose was measured with a fluoride-specific electrode (Orion 9609-BN) and digital ion analyzer (Orion 720 A). The variables ISM, FSM and fluoride release were analyzed statistically by analysis of variance and Tukey's test (p<0.05). There was significant difference in FSM between the storage media for Vitremer (pH 4.6 = 40.2 ± 1.5; water = 42.6 ± 1.4), Ketac-Fil Plus (pH 4.6 = 73.4 ± 2.7; water = 58.2 ± 1.3) and Fluorofil (pH 4.6 = 44.3 ± 1.8; water = 38.4 ± 1.0). Ketac-Fil Plus (9.9 ± 18.0) and Fluorofil (4.4 ± 1.3) presented higher fluoride release in water, whereas Vitremer (7.4 ± 7.1), Fuji II LC (5.7 ± 4.7) and Freedom (2.1 ± 1.7) had higher fluoride release at pH 4.6. Microhardness and fluoride release of the tested restorative materials varied according to the storage medium.
RESUMO
Este estudo avaliou as propriedades de microdureza de superfície e liberação de flúor de 5 materiais restauradores (Ketac-Fil Plus, Vitremer, Fuji II LC, Freedom e Fluorofil) em dois meios de imersão água destilada/deionizada e modelo de ciclagem de pH (4,6). Doze corpos-de-prova de cada material foram confeccionados e tiveram a microdureza de superfície inicial (MSI) determinada utilizando o microdurômetro Shimadzu HMV-2000 Micro Hardness Tester (carga estática Knoop). Os corpos-de-prova foram submetidos a ciclos de 6 e 18 h para os dois meios de imersão. A cada final de ciclo as soluções foram substituídas e armazenadas. Após 15 dias de imersão, a microdureza de superfície final (MSF) e a liberação de flúor foram determinadas. A dosagem de flúor foi feita com um eletrodo específico combinado para íon flúor (9609 BN - Orion) e analisador de íons digital (Orion 720 A). As variáveis MSI, MSF e liberação de flúor foram submetidas à análise de variância e teste de Tukey (p<0,05). Houve diferença estatisticamente significante na MSF entre os meios de imersão para o Vitremer (pH 4,6 = 40,2 ± 1,5; água = 42,6 ± 1,4), Ketac-Fil Plus (pH 4,6 = 73,4 ± 2,7; água = 58,2 ± 1,3) e Fluorofil (pH 4,6 = 44,3 ± 1,8; água = 38,4 ± 1,0). O Ketac-Fil Plus (9,9 ± 18,0) e o Fluorofil (4,4 ± 1,3) liberaram mais flúor na água; o Vitremer (7,4 ± 7,1), Fuji II LC (5,7 ± 4,7) e o Freedom (2,1 ± 1,7) no pH 4,6. A microdureza e liberação de flúor dos materiais restauradores estudados variaram de acordo com o meio de imersão.
Texte intégral:
1
Indice:
LILACS
Sujet Principal:
Cariostatiques
/
Matériaux dentaires
/
Fluorures
Type d'étude:
Prognostic_studies
Limites du sujet:
Humans
langue:
En
Texte intégral:
Braz. dent. j
Thème du journal:
ODONTOLOGIA
Année:
2007
Type:
Article