| dc.description.abstract | Alloys in oral cavity always interact with dynamic oral environment, such as pH, temperature, salivary conditions, and dietary habits. Coffee can further decrease pH in the oral cavity. Thus,
coffee may increase the release of metal ions that may lead to various health diseases. This study
aimed to quantitively investigate the effect of brewed Robusta coffee on the nickel ion release and
their morphological structures; Methods: 20 alloy specimens were divided into 4 groups and placed
in solutions for 48 and 168 h: (1) distilled water, (2) artificial saliva, (3) Robusta coffee, and (4) mixture
of artificial saliva and Robusta coffee. AAS, XRF, and SEM were used for examinations; Results: The
release of Ni2+ was found in all groups and robust release were found in the coffee only and mixture
of coffee + artificial saliva solution after 168 h. Likewise, SEM showed that internal oxidation was
high after 168 h of immersion; Conclusions: The concentration of nickel increased in saliva of low pH
due to brewed coffee. Though the release of these ions is still within the tolerable amount in human
body, it should be realized that it usually lasts for months or years. Dentists should be cautious when
using instructions for patients with a history of allergies especially for dietary with low acidity | en_US |
