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Biomedical subjects

D H Retief

Publications and source records attributed to D H Retief.

171 records · Page 10Linked to original sources
PubMedDate not supplied

In vitro dentine fluoride uptake from three fluoride-containing composites and their acid resistance.

OBJECTIVES: The purpose of this study was to determine the dentine fluoride uptake from three fluoride-containing composites (FluorEver, FluoroCore and Pertac-Hybrid) and to investigate their ability to affect the resistance of dentine to an artificial caries challenge. METHODS: Three dentine slabs were prepared from each tooth. The baseline, total and bound fluoride concentrations of each tooth were determined by three successive abrasion biopsies performed on each slab followed by adjusting to standardized depths of 10 microns. Next, dentine slabs ligated with the composites were suspended in synthetic saliva for 1 week. After removal of the composites, these specimens and controls were immersed in an artificial caries medium (pH 4.5) for 5 days. Each slab was sectioned and analysed by quantitative microradiography. RESULTS: The results indicate that dentine acquired significantly different amounts of fluoride from the three composites. The acid resistance of dentine in contact with the composites was also significantly different among the composites and followed the same order as for fluoride uptake. CONCLUSIONS: Dentine fluoride uptake and artificial caries inhibition were significantly greater with FluorEver followed by FluoroCore and Pertac-Hybrid.

Biopsy↗
PubMedDate not supplied

Adhesion to dentin.

The bond strengths of dentinal bonding systems to dentin and the microleakage at the dentinal bonding system to dentin interface are often determined in laboratory studies prior to the clinical evaluation of these systems. The shear bond strengths of some of the third generation dentinal bonding systems to dentin and the microleakage at the dentinal bonding system to dentin interface are discussed. In addition, the shear bond strengths of fluoride-containing liners/bases and the fluoride release from these systems are evaluated.

Dental Bonding↗
PubMedDate not supplied

Relationship between fluoride concentration in enamel, DMFT index, and degree of fluorosis in a community residing in an area with a high level of fluoride.

The object of the present study was an attempt to relate fluoride concentration in enamel, caries experience, and the degree of fluorosis in a community residing in an area with a high level of fluoride. A significant difference was found between the male and female samples for the F and D parameters. A positive correlation was established for the male participants between DEGF and F, and a negative correlation between age and F. These correlations were not found for the female participants. Because of the low and narrow range of DMFT indexes, no correlation involving this parameter could be established.

Adolescent↗