Dentin Permeability After Toothbrushing with Two Different Toothpastes

The present study aims to assess the morphology of enamel and dentin after treatments with various toothpastes in powder or paste form recently proposed for home use. Dentin permeability was calculated as hydraulic conductance (Lp). We also assessed the effect of manual brushing for a limited period on dentin morphology. Scanning electron microscopy (SEM) was made to evaluate the morphology of dentin after toothpaste treatment and application. Material Method. We uused teeth (third molars) extracted for orthodontic reasons from patients with a mean age of 32.5 years. Dentin permeability measurement. Each dentin disc was connect to a hydraulic system with a pressure of 30cm/H2O. After preparation, each sample was connected to hydraulic pressure apparatus to evaluate the permeability of dentin with the smear layer produced during the sectioning step. After 5 minutes, dentin was etched with 37% phosphoric acid gel for 2 minutes, washed and gently dried with cotton to measure the permeability after smear layer removal. The next phase was to examine dentin before and after treatments with toothpaste and brushing with scanning electron microscope (SEM). Results. No particular differences between the three products were seen (ename)l; however, the smear layer appeared modified and removed to a greater extent with Merfluan dental salts. Overall, the smear layer (on both enamel and dentin) was extremely thin, since producing and preparing the sample involved only light, weak movements with abrasive instruments. Conclusion. This study shows that all the toothpastes tested interact with a substratum, in this case the dentinal smear layer. The enamel smear layer, however, was more compact and less easily modified. Nonetheless, it should borne in mind that a single application of toothpaste and one brushing, however energetic, are unlikely to lead to modifications of a hard surface such a ename