In Vitro Effects Of Hydrogen Peroxide Combined With Different Activators For The In-office Bleaching Technique On Enamel.

Abstract Objective. The aim of this study was to evaluate the alteration of human enamel bleached with high concentrations of hydrogen peroxide associated with different activators. Materials and methods. Fifty enamel/dentin blocks (4 × 4 mm) were obtained from human third molars and randomized divided according to the bleaching procedure (n = 10): G1 = 35% hydrogen peroxide (HP - Whiteness HP Maxx); G2 = HP + Halogen lamp (HL); G3 = HP + 7% sodium bicarbonate (SB); G4 = HP + 20% sodium hydroxide (SH); and G5 = 38% hydrogen peroxide (OXB - Opalescence Xtra Boost). The bleaching treatments were performed in three sessions with a 7-day interval between them. The enamel content, before (baseline) and after bleaching, was determined using an FT-Raman spectrometer and was based on the concentration of phosphate, carbonate, and organic matrix. Statistical analysis was performed using two-way ANOVA for repeated measures and Tukey's test. Results. The results showed no significant differences between time of analysis (p = 0.5175) for most treatments and peak areas analyzed; and among bleaching treatments (p = 0.4184). The comparisons during and after bleaching revealed a significant difference in the HP group for the peak areas of carbonate and organic matrix, and for the organic matrix in OXB and HP+SH groups. Tukey's analysis determined that the difference, peak areas, and the interaction among treatment, time and peak was statistically significant (p < 0.05). Conclusion. The association of activators with hydrogen peroxide was effective in the alteration of enamel, mainly with regards to the organic matrix.

Educational in a global environment: non-formal examples of learning practices at the international office

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Meteorology ... Prepared under the superintendence of the director of the Meteorological office with the co-operation of a committee of the Royal society.

Pt.2

Report on the Iowa Office of Energy Independence for the year ended June 30, 2008

Report on the Iowa Office of Energy Independence for the year ended June 30, 2008

Report on the Iowa Office of Energy Independence for the year ended June 30, 2009

Report on the Iowa Office of Energy Independence for the year ended June 30, 2009

The Iowa Office of the State Medical Examiner, General Information.

A brochure describing the general duties and functions of the Iowa Office of the State Medical Examiner.

The Iowa Office of the State Medical Examiner, Information for Families.

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Report on the Iowa Office of Energy Independence for the year ended June 30, 2010

Report on the Iowa Office of Energy Independence for the year ended June 30, 2010

Agency Fact Sheet, Office of the Governor(office only), FY2006

This document produced by the Iowa Department of Administrative Services has been developed to provide a multitude of information about executive branch agencies/department on a single sheet of paper. The facts provides general information, contact information, workforce data, leave and benefits information and affirmative action data.

Results from the Testing of Adulterated Anhydrous Ammonia Provided by the State of Iowa's Office of Drug Control Policy, March 15, 2004

The report of adulterated anhydrous ammonia did not completely prevent the manufacture of methamphetamine. The amount of the methamphetamine manufactured using the adulterated ammonia was consistently very low. Although clandestine laboratory "field-like" reaction conditions were mimicked for purposes of these tests it should be noted that no attempts were made to distill the adulterated anhydrous ammonia.

Audit report on the Governor’s Office of Drug Control Policy for the year ended June 30, 2011

Audit report on the Governor’s Office of Drug Control Policy for the year ended June 30, 2011

Report on the Iowa Office of Energy Independence for the year ended June 30, 2011

Report on the Iowa Office of Energy Independence for the year ended June 30, 2011

Audit report of the Governor’s Office of Drug Control Policy for the year ended June 30, 2012

Audit report of the Governor’s Office of Drug Control Policy for the year ended June 30, 2012