Influência do ultra-som na resistência à abrasão e na rugosidade de superfície dos cimentos de ionômero de vidro submetidos à escovação / Influence of the ultrasound in the abrasion resistance and in superficial roughness of the glass ionomer cements submitted to toothbrush

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The purpose of this work was to evaluate abrasion resistance, by means of weight loss, and surface roughness (SR) of GIC, using ultrasonic excitation as a command set. The materials tested were Fuji II LC and Fuji IX (GC Corporation), Ketac Molar (3M ESPE), Resiglass and Bioglass (Biodinâmica), Vitro Fil LC, Vitro Molar and Vitro Fil (DFL). Twenty specimens of each GIC brand were evaluated, being half submitted to ultrasound (US) (Piezon - EMS, Switzerland). The materials were placed in bovine tooth matrix (5mm inner diameter and 3mm of thickness). Initial weight was carried out by means of a digital balance (210A LICiT/Italian). The initial SR was quantitatively assessed by measuring the surface roughness using Hommel Tester T1000 (Hommelwerke, Germany) determined by the average of 5 random measurements in each sample. The specimens were submitted to brushing abrasion test. Weight loss and surface roughness, for each specimen were calculated based on the difference between the initial and final weight and surface roughness means, respectively. Weight loss (g) varied between 0,0001 and 0,0090 with US and 0,0001 and 0,0123 without US. Surface roughness (µm) varied between 0,0770 and 0,4330 with US and -0,0270 and 0,3520 without US. The results, analyzed by two way ANOVA and Tukeys test (p<0,05), presented statistically significant difference in the surface roughness when the GIC was submitted or not to US (p=0,043) while no statistical difference was observed among the GIC brands (p=0,264). The weight loss presented statistically significant difference between the tested GIC brands (p<0,010), while no influence on the weight loss by the use of US was observed (p=0,403). Ultrasonic excitation during initial cure does not improve surface roughness of GIC, and does not present any influence on weight loss.

ASSUNTO(S)

desgaste glass ionomer cements ultra-som dental restoration wear ultrasonics cimentos de ionômeros de vidro

ACESSO AO ARTIGO

Documentos Relacionados