Brushing-induced effects with and without a non-fluoride abrasive dentifrice on remineralization of enamel surfaces etched with phosphoric acid.
The remineralization of acid-etched enamel after brushing with and without a non-fluoride abrasive dentifrice was investigated using scanning electron microscopy after sodium hypochlorite (NaOCl) or ethylenediamine tetra-acetic acid treatment, of the specimens. Ground enamel pieces were etched with 30% phosphoric acid for 60 s and attached to resin plates. They were exposed to the oral environment of 4 subjects for 8 weeks and brushed for 1 min daily. Paste and brushing caused the acid-etched enamel to erode selectively, i.e., deep grooves were formed in the prism peripheral regions, while projections of the prism bodies showing a relatively low density of crystallites were retained. Brushing without dentifrice, on the other hand, caused about 0.5 micron thick pellicle with tag-like structures to cover the etched enamel. Fine mineral granules, presumably derived from saliva and minute fragments of etched crystallites, were precipitated on the enamel surface as a thin layer with the pellicle. These results indicate that daily brushing without dentifrice induces the remineralization of acid-etched enamel by depositing salivary components, while paste brushing will lead to abrasion of the weakened enamel.
Kuroiwa
M
M
Kuroiwa Dental Clinic, Kanagawa, Japan.
Kodaka
T
T
Kuroiwa
M
M
Abe
M
M
D000134:Acid Etching, Dental; D000293:Adolescent; D000328:Adult; D002130:Calcium Phosphates / Q000008:administration & dosage / Q000627:therapeutic use; D002648:Child; D003461:Crystallography; D003741:Dental Deposits / Q000473:pathology; D003743:Dental Enamel / Q000187:drug effects* / Q000473:pathology*; D044622:Dental Pellicle; D003802:Dentifrices / Q000008:administration & dosage / Q000627:therapeutic use*; D004492:Edetic Acid / Q000494:pharmacology; D005260:Female; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D010756:Phosphoric Acids / Q000494:pharmacology*; D012463:Saliva / Q000502:physiology; D012973:Sodium Hypochlorite / Q000494:pharmacology; D014072:Tooth Abrasion / Q000473:pathology*; D014077:Tooth Erosion / Q000473:pathology; D014089:Tooth Remineralization; D014099:Toothbrushing
D002130:Calcium Phosphates; D003802:Dentifrices; D010756:Phosphoric Acids; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C485838:calcium phosphate, monobasic, anhydrous; C020243:calcium phosphate; D004492:Edetic Acid; D012973:Sodium Hypochlorite; C485829:calcium phosphate, dibasic, anhydrous