histological analysis of biocompatibility of ionomer cements with an acid-base reaction abstract: The purpose of this study was to evaluate the inflammatory and cure events of acid-based reactions using glass ionomer cement used for cementation of crowns, bridges, onlays and orthodontic bands implanted in subcutaneous tissue, at different time intervals. A total of 48 male Wistar rats were used, distributed into 4 groups (n = 12), as follows: Group C (control, polyethylene), Group ME (Meron), Group KC (Ketac Cem) and Group PR (Precedent). The animals were sacrificed after time intervals of 7, 15 and 30 days, and their tissues were analyzed under an optical microscope for such events as inflammatory infiltrate, edema, necrosis, granulation tissue, multinucleated giant cells, young fibroblasts and collagen. The results was assessed using Kruskal-Wallis and Dunn's tests (p < 0.05). In the initial period, intense inflammatory infiltrate was observed for all the materials with no significant difference among them (p = 0.104). Groups PR and KC showed significant difference in relation to Group C, at 7 days (p = 0.025) and 15 days (p = 0.006). Edema and giant cells were more expressive in Group ME, differing significantly from Groups C (p = 0.023) and KC (p = 0.039), respectively, at 7 days. Group ME showed a statistically significant difference in relation to Groups PR and KC for the presence of young fibroblasts (p = 0.009) and for collagen (p = 0.002), at 7 days. Within the limits of this in vivo study, Precedent and Ketac Cem glass ionomer cements showed better tissue healing with a greater number of fibroblasts and collagen, as compared to Meron.

The search for greater independence from one's parents and the physical, psychological, and social transformations that occur in adolescence can lead to a reduction in oral health care in this population. 1 Dental caries continues to be a public health problem and highly prevalent among 12-year-olds throughout the world (19.1 to 97.3%). 2 Studies have reported that socioeconomic and demographic factors are associated with dental caries, 3,4 but the psychosocial factors involved in this process have been explored little, especially in early adolescence.According to the literature, the family environment exerts an influence on health-related behaviour. 5 Family cohesion and adaptability, respectively, regard the emotional links among family members and the degree to which the members of a family are resilient and close to each other. 6 A previous study demonstrated that low family cohesion was associated with a lower frequency of tooth brushing and a greater

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Objectives: To determine whether family environment, signs of attention deficit/hyperactivity disorder (ADHD) and oral health literacy (OHL) are associated with visits to the dentist in adolescents. Methods: A school-based cross-sectional study was conducted with a representative sample of 448 12-year-old adolescents enrolled at schools in the city of Cajazeiras, Brazil. The adolescents answered a validated questionnaire addressing family cohesion and adaptability (FACES III), an OHL measure (Brazilian Rapid Estimate of Adult Literacy in Dentistry [BREALD-30]) and a questionnaire addressing the history of visits to the dentist and previous toothache experience. The parents answered a questionnaire addressing sociodemographic characteristics. Parents and teachers answered the inattention and hyperactivity/impulsivity subscales of the Swanson, Nolan & Pelham (SNAP-IV) questionnaire for the detection of signs of ADHD.Multiple Poisson regression with robust variance was used for data analysis (α = 5%). Results:The prevalence of having visited a dentist some time in life was higher among adolescents with enmeshed (PR = 1.08; 95% CI: 1.01-1.15) and connected (PR = 1.06; 95% CI: 1.01-1.13) families and those with attention deficit according to parents' reports (PR = 1.09; 95% CI: 1.04-1.14). A family income higher than the Brazilian minimum wage (PR = 1.06; 95% CI: 1.01-1.12) and toothache in the previous six months (PR = 1.05; 95% CI: 1.01-1.11) were also associated with the outcome. Conclusion:Family cohesion and attention deficit according to parental reports influenced visits to the dentist among adolescents. In contrast, OHL was not associated with the outcome.

Changes in enamel composition after a short bleaching procedure followed a gradient within component volumes (mineral loss>organic gain>water gain>decrease in permeability) and decreased from the enamel surface inward.