RESUMO
Background: To evaluate the effectiveness of Er:YAG and Nd:YAG laser on dentin hypersensitivity prevention, associated or not to acidulated phosphate fluoride (APF) after erosive challenge. Material and Methods: 104 specimens were obtained from bovine dentine and divided into groups (n=13): G1: Er:YAG; G2: Er:YAG followed by application of APF; G3: application of APF followed by Er:YAG, simultaneously; G4: Nd:YAG; G5: Nd:YAG followed by application of APF; G6: application of APF followed by Nd:YAG, simultaneously; G7:application of APF; G8: untreated. The parameters for Er:YAG were:10s, distance of 4mm, water cooling flow of 2mL/min, 2Hz, 3.92J/cm2. For the Nd:YAG: 10s, distance of 1mm, without cooling, 10Hz, 70.7J/cm2. The erosive drink was a cola at 4°C, 3×/day for 1 minute, for 5 days. Roughness and wear analysis were done in confocal laser microscope. Data were statistically analyzed (α=0.05). Results: As regards roughness, there was no statistically difference among the groups. The groups irradiated with Er:YAG had a volume loss lower. G6 showed higher values than the groups irradiated with Er:YAG and lower than the other groups. The other groups irradiated with Nd:YAG showed similar wear results to the control. Conclusions: The Er:YAG laser showed the lowest volume loss from wear analysis, suggesting the increased the acid resistance of dentin. Key words:Dentine sensitivity, Lasers, Sodium fluoride.
RESUMO
A cavidade bucal alberga espécies comensais que podem se tornar patogênicas e causar doenças, como a cárie. Pouco se sabe sobre como a exposição antigênica a microrganismos orais na gestação pode determinar a presença e transferência de anticorpos de mãe para os recémnascidos, que tem esta imunidade passiva como principal fonte de proteção. Desta maneira, o objetivo desta revisão foi realizar um levantamento bibliográfico a respeito de aspectos imunológicos relacionados com o aleitamento natural e seu papel protetor contra a colonização bucal inicial e desenvolvimento de cárie dentária em crianças. Os dados levantados permitiram concluir que os anticorpos do leite materno são dirigidos contra microrganismos a que a mãe tenha sido exposta, o que contribui para prevenção de doenças infecciosas, incluindo a cárie. Assim, a amamentação pode proporcionar fonte natural de amplo espectro de anticorpos no lactante, resultando em uma imunização passiva. No entanto, há pouca informação literária e atualizada a respeito da especificidade de anticorpos do leite materno contra as espécies cariogênicas, o que justifica a necessidade de elaboração de novas pesquisas
The oral cavity has commensal species that may become pathogenic and cause diseases, such as caries. Little is known about the antigenic exposition to oral microorganisms during the pregnancy and the presence and transfer of antibodies from mother to newborn, which has this passive immunity as the main source of protection. Thus, the aim of this review is to investigate in literature the immunological aspects related to breastfeeding and its protective role against the development of dental caries in children. The data collected can show that the antibodies from breast milk are directed against microorganisms that the mother has been exposed to, which contributes to prevention of infectious diseases, including dental caries. Thus, feeding can provide a natural source of broad spectrum of antibodies in lactating, resulting in passive immunization. However, little information about the specificity of breast milk antibodies against cariogenic species is found in literature, which justifies the need for development of new research.
