Fluoride penetration into the hybrid layer from a dentin adhesive

To evaluate the in vitro microleakage of a new fluoride-containing dentin adhesive and to provide evidence for fluoride release from the adhesive and penetration into the dentin. Class V preparations with margins in enamel and dentin were made in the buccal and lingual surfaces of six extracted huma...

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Bibliographic Details
Published inAmerican journal of dentistry Vol. 11; no. 1; p. 23
Main Authors Ferracane, J L, Mitchem, J C, Adey, J D
Format Journal Article
LanguageEnglish
Published United States 01.02.1998
Subjects
Calcium - chemistry
Composite Resins - chemistry
Dental Cements - chemistry
Dental Leakage - prevention & control
Dental Restoration, Permanent - methods
Dentin - ultrastructure
Dentin-Bonding Agents - chemistry
Diffusion
Electron Probe Microanalysis
Fluorides - chemistry
Fluorides, Topical - chemistry
Humans
Microscopy, Electron, Scanning
Phosphorus - chemistry
Resin Cements
Silicon Dioxide
Statistics, Nonparametric
Surface Properties
Zirconium
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Summary:To evaluate the in vitro microleakage of a new fluoride-containing dentin adhesive and to provide evidence for fluoride release from the adhesive and penetration into the dentin. Class V preparations with margins in enamel and dentin were made in the buccal and lingual surfaces of six extracted human third molars. Six preparations were restored with Scotchbond Multipurpose (SBMP)/Z100 composite and six with a new fluoride containing dentin adhesive (FB)/Litefil composite. After aging for 30 days in water at 37 degrees C, the teeth were stained with silver nitrate, sectioned and graded by two observers for leakage at the enamel and dentin margins. Selected FB specimens were examined in the scanning electron microprobe using WDS for fluoride and EDS for calcium and phosphorous. Fluoride release into water from disks of FB adhesive was evaluated for up to 112 days using a specific ion electrode. Fluoride leached from the adhesive at a decreasing rate with time. The final rate over 112 days was 0.02 ppm/day (0.2 microgram/cm2/day). Leakage at the enamel and dentin margins was similar for both adhesives (Mann-Whitney U-test; P < or = 0.05). SEM evaluation showed the presence of a discontinuous hybrid layer of 2-3 microns. Fluoride was present within, but limited to, the hybrid layer for the FB adhesive. The penetration of fluoride could only be confirmed in areas where leakage had occurred.
ISSN:0894-8275