Abstract
This study was attempted to investigate the effect of acid etchants on diammine silver fluoride applied primary dentin, and to investigate tooth-adhesive resin penetration into it.
57 extracted or exfoliated primary teeth with caries extended into the dentin, to which 38% diammine silver fluoride had been applied clinically for preventing tooth caries (33 cases) or applied after the extraction (24 cases), were used. Softened dentin was removed dry with the steel bars and a hand instrument. The dentin was etched for 1 minute, then rinsed with water for 30 seconds and desiccated with compressed air for 30 seconds.
The commercially available acid etchant (40% phospholic acid), the bonding agent and the resin used in this study was Clearfil-F. The time after application of diammine silver fluoride until the application of the acid etchant and the resin was 14 to 1278 days in clinically applied cases and 0 to 28 days in cases applied after the extraction.
The following observations were obtained under SEM.
1. The effect of the acid etchants was less than in the cases of noncarious dentin and caries decayed but not applied with diammine silver fluoride.
2. The dentin surfaces were covered with cuboidal crystal-like, hexahedral crystallike concrescence, fibriform and amorphouse materials which were not seen in the cases without application of diammine silver fluoride, and the openings of the dentinal tubles were unclear even after etching.
3. The resin penetration into the diammine silver fluoride applied primary dentin was lower than that into the noncarious primary dentin and caries decayed but not applied with diammine silver fluoride.
4. There was not seen any statistical significant difference between the length of the resin tags and the period after application of diammine silver fluoride.
