Qualitative microanalysis of ions and ultrastructural changes in dentin exposed to laser irradiation and to metal salts solution
✍ Scribed by Carlos E. Glauche; Patricia M. de Freitas; Nilson D. Vieira Jr.; José Luiz Lage Marques
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 265 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0196-8092
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✦ Synopsis
Background and objectives:
This study evaluated the ultrastructural changes in dentin after treatment with the nd:yag laser and/or metal salt solutions and verified the presence of sn++, sr++, and f- in dentin structure.
Study designs/materials and methods:
Sixty dentin disks were randomly divided into groups (n = 10): (i) control (no treatment), (ii) nd:yag (1.5 w, 100 mj, 15 hz, 125 j/cm2), (iii) 10% snf2 aqueous solution for 30 minutes, (iv) nd:yag+10% snf2 aqueous solution for 30 minutes, (v) 10% srcl2 toothpaste for 30 minutes, (vi) nd:yag+10% srcl2 toothpaste for 30 minutes. then, all samples were prepared for scanning electron microscopy (sem) and the samples from groups i to iv for the energy dispersive x-ray microanalysis (edx).
Results:
Sem evaluation revealed occluded dentinal tubules and a dentin surface altered by the laser irradiation. the edx microanalysis revealed sn++ at a depth of 250 microm in group iv and not deeper than 100 microm in group iii. in group v, sr++ was not deeper than 50 microm, but it could be detected at a depth of 500 microm in group vi. f- was found only in group iv.
Conclusions:
Ultrastructural changes caused by laser irradiation can increase dentin uptake of sn++, sr++, and f-.