Agentes químicos para controle de placa bacteriana / The chemical agents to control the bacterial plaque

A placa bacteriana tem sido considerada o principal fator etiológico das doenças periodontais e a prevenção ou o tratamento destas patologias deve estar baseado no seu controle. Neste trabalho, os autores descrevem as substâncias que têm sido usadas no controle químico de placa bacteriana, como clorexidina, óleos essenciais, triclosan, sais metálicos, compostos quatemários de amônia, agentes oxigenantes e sanguinarina

Acquisition of alkali-soluble fluoride by enamel through treatment with NaF-containing toothpastes in vitro / Obtenção de fluoreto alcalino solúvel pelo esmalte através de tratamento com NaF inseridos em pastas de dente in vitro

The first aim of the present study was to examine if alkali-soluble fluoride (calcium fluoride-like material and adsorbed fluoride) forms when a Naf-containing toothpaste is applied on human enamel surface in vitro. The centrifuged supernatants of toothpastes dissolved in distilled water were used and four different commercial Naf-containing toothpastes were tested. The second aim was to investigate if pyrophosphate would interfere with the deposition of alkali soluble fluoride. The formation of alkali-soluble fluoride was determined by chemical analysis and visualized by scanning electron microscopy (SEM). It was ascertained that all tested toothpastes contained free fluoride according to the manufactures' specifications. It was shown that they promoted deposition of alkali soluble fluoride on the enamel surface. The amount of deposited material increeased with the time of exposure. The clinical effect of a NaF-containing toothpastes may thus well depend on an initial formation of alkalisoluble fluoride. Fluoride from this reservoir may adsorb onto the enamel crystals and inhibit further demineralization or increase the rate of remineralization during cariogenic challenges. It was also demonstrated that pyrophosphate did not interfere with the deposition of alkali soluble fluoride