The effect of bleaching agents on mercury release from spherical dental amalgam.

To investigate the effect of carbamide peroxide, hydrogen peroxide, and over-the-counter home bleaching products on the release of mercury from spherical dental amalgam, 150 uniform amalgam specimens were prepared in clear acrylic blocks, aged for one week at 37 degrees C, and placed into individual polystyrene jars containing 20 mL of sterile saline. The specimens were divided into three groups of 50 and bleached in eight-hour cycles. All groups exposed to bleach showed increased mercury release over time.

Salivary mucin as related to oral Streptococcus mutans in elderly people.

MG1 (MUC5b and MUC4) and MG2 (MUC7), predominant mucins in human whole saliva, provide lubrication and antimicrobial protection for oral tissues. This study examines potential relationships between Streptococcus mutans titers in the oral cavity and the following: mucin concentrations; unstimulated and stimulated whole saliva flow rates; decayed, missing, and filled tooth surfaces; and age of 24 elderly patients. S.

In vitro comparison of fluoride release of six direct core materials.

Statement Of Problem: Fluoride has been shown to deter caries and has been incorporated into core build-up materials. However, there is considerable variation in the formulation and release of fluoride from core build-up materials.

Purpose: This in vitro study compared the fluoride released by 6 commercially available fluoride-releasing core materials over time.

Effect of home bleaching products on mercury release from an admixed amalgam.

Purpose: To test the effect of three carbamide peroxide bleaching products, Opalescence (O), Nite White (N), and Platinum (P) on mercury release from amalgam (Valiant PhD).

Materials And Methods: Sixty uniform amalgam specimens were prepared in Acrylite clear acrylic blocks. After aging for 1 week at 37 degrees C, the specimens were placed in individual polystyrene jars containing 20 mL of sterile saline, and divided into three groups A, B, and C.

Fluoride release of glass ionomer-based luting cements in vitro.

Statement Of Problem: There is considerable variation in generic formulation and in reported fluoride release from resin-modified glass ionomer luting cements.

Purpose: This study compared fluoride release from 2 generically similar resin-modified glass ionomer luting cements (Vitremer and Advance) with release from 2 conventional glass ionomer luting cements (Ketac-Cem and Fuji I).

Material And Methods: Ten specimen disks of each of the 4 luting cements were fabricated and immersed in deionized water in individual polystyrene jars.

Effect of peroxide bleaches on fluoride release of dental materials.

Purpose: To investigate the effect of two bleaching agents, 35% hydrogen peroxide (Superoxal) and 10% carbamide peroxide (Opalescence), on the release of fluoride from Ketac-Fil, a glass ionomer cement, Photac-Fil, a glass ionomer/resin hybrid; and Tetric, a resin composite with fluoride.

Materials And Methods: Seven disks (9 x 3 mm) of each material were immersed in Superoxal for 1 hour to simulate an in-office application; seven other disks of each material were immersed in Opalescence 1 hour daily for 7 days to simulate a week of home bleaching regimen; and seven additional disks of each material without bleach served as a control. The disks were kept in deionized water and the water was tested for fluoride released every 24 hours for 14, 21, 28, and 35 days, respectively.

The effect of a training program on the reliability of examiners evaluating amalgam restorations.

There have been long-term problems in establishing agreement among clinical and preclinical examiners in dentistry. The purpose of this study was to develop a training program and study its effect on examiner agreement when judging the clinical service ability of amalgam restorations. Ten examiners with varying backgrounds, levels of experience, and no previous training with methods to standardize clinical evaluation evaluated 44 amalgam restorations in 17 patients before and after a brief training session.

Complications and prognostic considerations in operative dentistry.

Several aspects of routine operative treatment procedures may result in particularly challenging problems and complications. This article reviews the potential for such complications with emphasis on the ultimate treatment prognosis.