Eduardo Pizzatto

Influence of chlorhexidine concentration on microtensile bond strength of contemporary adhesive systems.

The purpose of this study was to investigate the influence of chlorhexidine (CHX) concentration on the microtensile bond strength (muTBS) of contemporary adhesive systems. Eighty bovine central incisors were used in this study. The facial enamel surface of the crowns was abraded with 600-grit silicon carbide paper to expose flat, mid-coronal dentin surfaces. The tested materials were Scotchbond Multipurpose (SMP), Single-Bond (SB), Clearfil SE Bond (CSEB) and Clearfil Tri S Bond (CTSB). All the materials were applied according to manufacturers instructions and followed by composite application (Z250). The teeth were randomly divided into 16 groups: for the etch-and-rinse adhesives (SMP and SB), 0.12% or 2% CHX was applied prior to or after the acid etching procedure. For the self-etch adhesives (CSEB and CTSB) 0.12% or 2% CHX was applied prior to the primer. Control groups for each one of the adhesive systems were also set up. The specimens were immediately submitted to muTBS testing and the data were analyzed using Analysis of Variance and the Tukey post hoc test (alpha = .01). The failure patterns of the specimens were observed using scanning electron microscopy. The effects of 2% CHX were statistically significant (p < 0.01) for the self-etch adhesives but were not significant for the etch-and-rinse adhesive systems. Analysis of the data demonstrated no statistical difference between the etch-and-rinse adhesive systems. CHX-based cavity disinfectants in concentrations higher than 0.12% should be avoided prior to the self-etch adhesive systems evaluated in this study to diminish the possibilities of reduction in bond strength.

Domestic Violence Against Children and Adolescents: Prevalence of Physical Injuries in a Southern Brazilian Metropolis

Violence against children and adolescents is a public health issue worldwide that threatens physical and mental wellbeing and causes irreparable harm. Reports on this violence are an essential way to prevent it and to protect the children and adolescents. Thus, the objective of the present study was to evaluate the prevalence of physical injuries that occur in domestic environments and reported to the Child and Adolescent Protection Network. This retrospective study was conducted at the Epidemiology Center of the Municipality of Curitiba. A total of 10,483 reports for the years 2010 (5,112) and 2011 (5,371) were analyzed and from them were selected reports of physical injuries that occurred in the family environment. The children and adolescents were 0-17 years old, comprising 322 cases of physical abuse within the family in 2010. Out of these, 57.1% were male and 42.9% were female, and 58% (187) presented head and neck injuries. There were 342 reports in 2011, 49% were male and 51% were female; head and neck injuries corresponded to 65% (222) of the reported cases. The prevalence of injuries increased by 6% and head and neck injury increased by 19% between 2010 and 2011. It may be concluded that physical abuse is associated with a high prevalence of head and neck injury, which is easily observed by the health and education professionals. Notification organs should be created in Brazilian hospitals and health centers, which is essential to conduct epidemiological surveillance and appropriate policies.

Prevalence of diagnosed temporomandibular disorders: A cross-sectional study in Brazilian adolescents

Background The prevalence of signs and symptoms of temporomandibular disorders (TMD) increases during adolescence and adulthood. Few studies have examined TMD prevalence in Brazilian adolescents. Aim To investigate the prevalence of TMD in Brazilian adolescents. Methods A representative population-based sample of 934 adolescents (10–14-years-old) was examined. TMD screening was performed using a questionnaire by the American Academy of Orofacial Pain. TMD diagnoses used research diagnostic criteria for temporomandibular disorders (RDC/TMD—Axis-I). Examinations were performed by a single calibrated examiner (kappa > 0.80). Results The prevalence of TMD symptoms was 34.9%; the most frequently reported symptoms were headache and neck ache (20.9%), followed by joint sounds (18.5%). Myofascial pain was the most prevalent type (10.3%), followed by disc displacement with reduction (8.0%) and arthralgia (3.5%). There was a significant association between sex and TMD symptoms; prevalence was significantly higher in girls (RP = 1.37; 95% CI = 1.14–1.65; p = 0.001). Myofascial pain of TMD and displacement with reduction were more prevalent in girls (RP = 1.76; p = 0.007 and RP = 2.06; p = 0.004, respectively). Conclusion TMD symptoms were present in 34.9% of adolescents, with myofascial pain being the most prevalent type (10.3%). TMD was significantly more common in girls. Routine pediatric dental care should include a TMD screening.

Oral health status in victims of child abuse: a case-control study

BACKGROUND Few studies have evaluated the oral health status of children with a history of maltreatment. AIM This case-control study evaluated oral health in children who were victims of abuse and in child protective services in Curitiba, Brazil. DESIGN One hundred twenty-two children who were victims of abuse and 240 children with no history of abuse (mean ages, 8.56 and 8.24 years, respectively) were included in the study. Dental caries were assessed according to the Decayed, Missing, or Filled Teeth index (dmft index and DMFT index) by two calibrated examiners. The presence of anterior open bite and posterior crossbite was recorded. Data were analyzed using bivariate and adjusted odds ratios using a multivariate logistic regression model analyses. RESULTS In the case group, we found a higher DMFT index (P < 0.001) and a significantly higher prevalence of missing primary teeth (P = 0.04), untreated decayed permanent teeth (P < 0.001), filled permanent teeth (P < 0.001), and anterior open bite (P = 0.04). Children who were victims of abuse presented an odds ratio of 6.48 (95% CI: 3.52-11.95) for caries in permanent teeth and an odds ratio of 2.28 (95% CI: 1.04-4.99) for open bite. CONCLUSION Victims of child abuse had a worse oral health status, demonstrating the need to establish special policies for oral healthcare for this population.

Child abuse: validation of a questionnaire translated into Brazilian Portuguese

This study sought to validate the Portuguese translation of a questionnaire on maltreatment of children and adolescents, developed by Russell et al. and to test its psychometric properties for use in Brazil. The original questionnaire was translated into Portuguese using a standardized forward-backward linguistic translation method. Both face and content validity were tested in a small pilot study (n = 8). In the main study, a convenience sample of 80 graduate dentistry students with different specialties, from Curitiba, PR, Brazil, were invited to complete the final Brazilian version of the questionnaire. Discriminant validity was assessed by comparing the results obtained from the questionnaire for different specialties (pediatric dentistry, for example). The respondents completed the questionnaire again after 4 weeks to evaluate test-retest reliability. The comparison of test versus retest questionnaire answers showed good agreement (kappa > 0.53, intraclass correlation > 0.84) for most questions. In regard to discriminant validity, a statistically significant difference was observed only in the experience and interest domains, in which pediatric dentists showed more experience with and interest in child abuse compared with dentists of other specialties (Mann-Whitney test, p < 0.05). The Brazilian version of the questionnaire was valid and reliable for assessing knowledge regarding child abuse by Portuguese-speaking dentists.

Association between decrease in salivary iron levels and caries experience in children

OBJECTIVE: Human saliva has numerous components that are important for maintaining oral health. We investigated the association between iron levels in saliva in children and their caries experience. METHODS: We conducted a case-control study that included 186 healthy children, aged 11-14 years. The decayed-filled teeth/decayed-missing-filled teeth (DMFT) score was estimated according to the Brazilian Oral Health Project. The children were divided into two groups: caries-free group (DMFT=0, n=55) and caries experience group (DMFT≥1, n=131). Saliva was collected from each child using the spitting method and analyzed for stimulated saliva flow (SSF), pH, and iron levels. The SSF, pH, and salivary iron levels were analyzed for statistical assumptions of normality and homoscedasticity and compared between groups. All of the statistical tests were performed using R and SPSS software, with a level of significance of 0.05. RESULTS: No statistically significant differences in mean pH were found between groups (t=-0.0488, p=0.51). Children with caries experience had significantly lower salivary iron levels than caries-free children (w=5088, p<0.0001). The SSF values were significantly different between children with caries experience and children without caries (w=4198, p=0.03). CONCLUSION: Salivary iron levels were significantly lower in children with dental caries experience, suggesting that salivary iron plays a role in maintaining oral health.

Evaluating of oral and salivary conditions of two specific groups of workers

Introduction and Objective: Tooth decay is one of the most common chronic oral diseases found in industrial countries and is a multifactorial disease which has sugar as a key dietary factor. The amount of saliva concentration and presence of cariogenic bacteria will favor the development of caries. Because of this, the aim of this study was to collect and analyze data on oral alterations referred to tooth decay, oral pH changes, and changes of the oral microbiota in two distinct groups of workers. Material and methods: 30 individuals belonging to two different groups of workers: group A (GA) – workers who maintain daily contact with the confectionery; group B (GB) – workers who do not have such contact. Saliva collection was done by analysis of the salivary pH in both groups, as well as cultivation of Lactobacillus spp and S. mutans. We also evaluate the dental status of individuals belonging to the two groups through the DMFT index. Results: After the examinations of 30 workers (17 from the GA [9 men and 8 women] and 13 in the GB [7 men and 6 women]), the mean DMFT of the individuals in the group A and group B, was 7.41 (SD 5.14) 7.08 (SD 5.56), respectively, without statistically significant differences (p < 0.05). The count of S. mutans and Lactobacillus spp, was not statistically significant. Conclusion: There was no statistically significant relationship between presence of dental caries and the fact that workers are in contact with sugar because they work on candy food industry, but new studies are needed for more precise research.

Maus tratos infantis: avaliação do currículo dos cursos em odontologia

The aim of this study was to evaluate whether the theme child abuse is addressed in the undergraduate dentistry in Brazil. This is a cross-sectional exploratory study, in which all universities in the country with the course of dentistry were questioned. Questionnaires were forwarded to all 201 coordinators of education of dentistry in Brazil, which consist in all existing courses at the time of the research. 174 questionnaires were received by the coordinators; however, only 28 were answered (response rate of 16.09%). Of these, 19 (67.8%) were private institutions, 06 (21.4%) public and 03 (10.7%) were joint management. The theme is approached by 21 institutions (75%), mainly in the disciplines of Dentistry, Forensic Dentistry and Public Health. Regarding the amount of hours designated for this theme, 16 institutions (21.19%) mentioned to reserve 08 hours or less during the course, on the other hand, 14 institutions (66.66%) stated that they were required to approach this issue within the course. Due to the importance of the theme child abuse and compared to the results of this study, it seems reasonable to conclude that this matter has been worked very incipient in Dental Courses in Brazil.