Fluoride Release from Two High-Viscosity Glass Ionomers after Exposure to Fluoride Slurry and Varnish

The effect of brushing with different fluoride slurries on the fluoride release (FR) of different high-viscosity glass ionomer cements (GICs) was investigated. Fifty-eight discs were fabricated from two high-viscosity GICs (GC Fuji IX (F9) and 3M ESPE Ketac-fil (KF)). Five specimens from each brand were used to measure Vickers microhardness and the remaining were randomly assigned to one of four groups (n = 6) based on two-factor combinations: (1) fluoride concentration in the abrasive slurry (275 or 1250 ppm fluoride as NaF) and (2) immersion in a 22,500 ppm fluoride-containing solution. Specimens were brushed for a total of 20,000 strokes over 4 days with daily FR measurement. Data were analyzed using analysis of variance and Bonferroni tests (α = 0.05). Baseline FR and microhardness values were different between the two tested material brands. Exposure to a 22,500 ppm solution was associated with higher FR but not the exposure to 1250 ppm slurries. Brushing and immersion of glass ionomer cements in a 22,500 ppm F solution led to higher FR that was more sustained for KF. Type of the glass ionomer, progressive brushing, and fluoride varnish affected FR but not the fluoride content in the abrasive slurry

The case for epistocratic republicanism

In recent years, the fortunes of democracy have waned both in theory and practice. This has added impetus not only to the republican case for strengthening democratic institutions but also to new anti-democratic thought. This article examines the claim made by Jason Brennan that epistocracy, rule by the ‘knowledgeable’, is compatible with freedom from domination. It begins by briefly explaining epistocracy and republicanism. It then presents the argument for epistocratic republicanism: that democracy can be a source of domination and that freedom from domination can be secured through non-democratic political institutions. The case against epistocratic republicanism is grounded in concerns about systemic domination and the ability of epistocrats to arbitrarily set the terms of social cooperation. These two arguments are judged on the basis of which better minimises domination while respecting its value to all people. Epistocratic republicanism is found to be less reliable because of the risks of epistemic injustice that accompanies systemic domination; democracy, accompanied by other republican institutions, is better at minimising domination and respecting persons. It concludes that republicans ought to be democrats

Naval Postgraduate School Graduation Exercises / Class of December 1999

Date of Commencement ceremony: Thursday 16 December 1999

Naval Postgraduate School Graduation Exercises / Class of December 1999

Date of Commencement ceremony: Thursday 16 December 1999