Study on acid resistance of human dental enamel and dentin irradiated by semiconductor laser with Ag(NH3)(2)F solution

Citation
Dg. Yu et al., Study on acid resistance of human dental enamel and dentin irradiated by semiconductor laser with Ag(NH3)(2)F solution, J CLIN LASE, 19(3), 2001, pp. 141-146
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Surgery
Journal title
JOURNAL OF CLINICAL LASER MEDICINE & SURGERY
ISSN journal
1044-5471 → ACNP
Volume
19
Issue
3
Year of publication
2001
Pages
141 - 146
Database
ISI
SICI code
1044-5471(200106)19:3<141:SOAROH>2.0.ZU;2-M
Abstract
Objective: The purpose of this study was to investigate the acquired acid r esistance of human dental enamel and dentin treated by 38% diamine silver f luoride [Ag(NH3)(2)F] solution and semiconductor (diode) laser irradiation in vitro, Background Data: There have been no reports on the acid-resistant effect by combined use of fluoride and semiconductor laser. Methods: Sixty crowns of extracted human molars were divided into two groups for enamel a nd dentin samples, and each group was subdivided into three subgroups of 10 each. Each subgroup of enamel and dentin samples served as a control; one was treated with Ag(NH3)(2)F and the other was treated with Ag(NH3)(2)F and semiconductor laser irradiation at 2 W for 30 sec. Then all samples were i mmersed in 5 mi of 0.1 M lactic acid (pH 4.8) at 37 degreesC for 24 h, The concentration of calcium ion (Ca2+) dissolved in the solution was measured by atomic absorption spectrophotometry, and the samples were observed by st ereoscopy and scanning electron microscopy (SEM), Results: In both enamel a nd dentin samples, dissolved Ca2+ concentration in Ag(NH3)(2)F- or Ag(NH3)( 2)F- and laser-treated group was significantly decreased compared with that in the control (p < 0.01), SEM findings showed that numerous cubic particl es ranging from 0.1 to 0.5 mum were observed only in the combined treated g roups of both enamel and dentin samples. Conclusions: A significantly decre ased solubility of human enamel and dentin was acquired after treatment by Ag(NH3)(2)F and semiconductor laser irradiation, which suggested that this combined use has the capability of a more efficient acid-resistant effect o n human dental hard tissues.