This study evaluated the association of level of anxiety in children with and without sleep bruxism (SB). The study was performed with 84 six- to eigth-years-old children, divided into two groups: with bruxism (BG) and without bruxism (CG). Following the criteria purposed by American Academy of Sleep Medicine (AASM) to determine SB, the presence of tooth wear has been verified through clinical examinations, and the parents have answered a questionnaire about their children’s behavior and habits. Additionally, the State-Trait Anxiety Inventory for Children (STAIC) was applied to parents of the selected patients. Data analysis revealed a statistical significant difference between the groups (Student’s t-test, p= 0.0136). Based on the results, anxiety assessment revealed that children with bruxism have reached higher levels in the STAIC scale than the non-bruxism group. Therefore, it indicates a direct relationship between the presence of anxiety disorder and the onset of bruxism in children.

AIM: To investigate the amount of connective tissue migrated into the extraction socket using EPTFE and latex membranes. METHODS: Seventeen rats were selected and randomly divided into 3 groups: e-PTFE membrane (n = 6), Latex membrane (n = 6) and Control (no membrane, n=5). After extraction of the maxillary right incisor, the animals of the test groups were subjected to alveolar guided bone regeneration (GBR) surgery and received an expanded polytetrafluoroethylene (e-PTFE) and a latex membrane, respectively. Thirty days after surgery, the animals were killed and histometric analysis was done to evaluate the migration of connective tissue. Data were analyzed statistically by one-way ANOVA and multiple-comparison Tukey's test at 5% significance level. RESULTS: There was statistically significant difference between groups e-PTFE and Latex (p=0.001), and between groups e-PTFE and Control (p=0.012), but no significant difference was found between groups Latex and Control (p=0.416). CONCLUSIONS: The e-PTFE membrane showed better results and appeared more adequate for GBR therapy, forming a barrier to prevent the migration of connective tissue into the extraction socket. The latex membrane, on the other hand, did not show benefits over the control group.

OBJETIVO: Avaliaram-se os efeitos do clareamento dental caseiro na liberação de oxigênio a partir de dentes clareados, na resistência de união ao cisalhamento e microinfiltração de restaurações com resina composta. METODOLOGIA: Foram selecionados 40 incisivos bovinos para titulação dos níveis de oxigênio pelo método iodométrico e 26 dentes para resistência de união e microinfiltração. Para titulação os dentes foram divididos em 4 grupos: T1- clareado e titulado após 24 h; T2- clareado e titulado após 48 h; T3- não clareado e titulado após 24 h; T4- não clareado e titulado após 48 h. No grupo T5 não se usaram dentes, servindo como controle inicial do teor de oxigênio. Para cisalhamento associado a microinfiltração dividiram-se aleatoriamente os dentes em 2 grupos: CM1- clareado; CM2- não clareado. O regime de tratamento clareador (Opalescense a 15%, Ultradent, South Jordan, UT, USA) foi de 8 h por dia durante 3 semanas. Para as restaurações utilizou-se a resina Z250 (3M-ESPE, St. Paul, MN, USA) com adesivo Single Bond (3M-ESPE, St. Paul, MN, USA). RESULTADOS: Houve aumento significativo na liberação de oxigênio durante nas primeiras 24 h pós clareamento (ANOVA, P=0,0001). O teste t de Student confirmou diminuição da resistência de união para o grupo clareado (P=0,0001). Houve significante aumento na microinfiltração no grupo clareado, independentemente do examinador (teste de Wilcoxon: 1. P=0,0003; 2. P=0,0023; 3. P=0,0029). CONCLUSÃO: Há considerável variação nos resultados de liberação de oxigênio, resistência de união e microinfiltração em dentes submetidos a clareamento dental caseiro.

PURPOSE: This in vitro study evaluated the effect of home dental bleaching on oxygen release, shear bond strength to enamel, and microleakage of direct composite restorations. METHODS: Forty bovine incisors were used for oxygen dissolved titration by means of iodometric methods modified by azide iodine and 26 for the shear bond strength and microleakage tests. For titration the teeth were divided into four groups: T1 - bleached and titrated after 24 h; T2 - bleached and titrated after 48 h; T3 - unbleached and titrated after 24 h; T4 - unbleached and titrated after 48 h. T5 group served as control for the initial oxygen release rate. To analyze shear bond strength and microleakage, the teeth were randomly divided into two groups: CM1 - bleached; CM2 - unbleached. The bleaching agent Opalescence 15% (Ultradent, South Jordan, UT, USA) was applied for 8 h per day for three weeks. Z 250 (3M-ESPE, St. Paul, MN, USA) composite and Single Bond (3M-ESPE, St. Paul, MN, USA) adhesive were used for the composite restoration procedures. RESULTS: There was an increase in oxygen release during the first 24 h post bleaching (ANOVA, P=0.0001). The bleached teeth showed a decrease in shear bond strength (Student's t test, P=0.0001). The microleakage scores increased with bleaching independently from the examiner (Wilcoxon's test: 1. P=0.0003; 2 P=0.0023; 3. P=0.0029). CONCLUSION: Considerable variation was noticed in the results of oxygen release, as well as in the results of shear bond strength and microleakage on bleached teeth.