Does the Elapsed Time from Bleaching and the Use of Sodium Ascorbate Influence the Bond Strength of Resin Cement to Bleached Enamel?

The objective of this study was to evaluate different delaying times after bleaching and the use of different sodium ascorbate (SA) concentrations (10% and 35%) in the bond strength of adhesive cementation to enamel. This study used 54 sound bovine incisors, which were randomly assigned to the following groups: G1 (unbleached/control+ adhesive cementation (AC)); G2 (bleached + AC after 7 days); G3 (bleached + 10% SA + AC after 24 h); G4 (bleached + 10% SA + AC after 7 days); G5 (bleached + 35% SA + AC after 24 h); and G6 (bleached + 35% SA + AC after 7 days). After bleaching, G3, G4, G5, and G6 received an application of SA before the cylinders build up with RelyX Veneer cement. The samples were subjected to microshear test, and the results were analyzed by two-way ANOVA with Tukey's post hoc test. Group one presented the highest mean bond strength (19.1 MPa) and G3 the lowest (16.96 MPa). There was no statistical difference between the groups tested (p ˃ 0.05). The fracture pattern observed was predominantly mixed. The adhesive cementation may be performed 24 h after bleaching when SA (10% or 35%) is used or after 7 days, without compromising bond strength.

Perception of dental care among children

Children that arrive at dental offices with fear and anxiety usually tend to resist conditioning mechanisms. The aim this study was to evaluate children's perception about dental treatment and to identify factors that influence this perception. Material and Methods: A random sample of 100 children of both genders aged 3 to 12, who were treated at the Department of Dentistry of a University (group I) and at a Children's Hospital (group II), was selected. A structured questionnaire about the child's perception about dental care was applied and the children were asked to draw a picture of this topic. Most of children expressed a positive perception in the questionnaire and in the drawings (93.8%). This positive perception was more pronounced in group I (94%) and in children aged 3 to 5 years (100%), particularly in girls (78%). The main cause of fear was the use of needles (42.4%). Many children (24.2%) reported to prefer the noninvasive procedures. A positive perception of dental treatment was observed in the majority of the sample. Therefore, dental pediatricians must be aware of the perception of children for better conditioning (Au)

Association between prosthetic factors and temporomandibular disorders in complete denture wearers.

OBJECTIVE: The purpose of this study was to investigate the prevalence of temporomandibular disorders (TMD) in denture wearers and the association between prosthetic factors and this condition. BACKGROUND: There is no consensus about the relationship between prosthetic factors and TMD among denture wearers. MATERIALS AND METHODS: The sample was composed of 92 patients wearing both maxillary and mandibular complete dentures. The Research Diagnostic Criteria for TMD (RDC/TMD) were adopted for patient examination. Objective evaluation of denture quality was determined by analysis of retention and stability of mandibular denture, interocclusal distance, articulation and occlusion. Association between denture quality and TMD diagnosis was analysed using chi-square and Fisher's exact tests. RESULTS: 37.4% of the patients presented TMD. Denture quality was not significantly associated with the presence of TMD: mandibular retention (p = 0.466); mandibular stability (p = 0.466); interocclusal distance (p = 0.328); centric relation (p = 0.175); and balanced occlusion (p = 0.56). CONCLUSION: Within the scope of this case-controlled cross-sectional study, no robust association between prosthetic factors and TMD was found.

Evaluation of complete denture quality and masticatory efficiency in denture wearers.

PURPOSE: This study aimed to investigate (1) the influence of complete denture quality and years of denture use on masticatory efficiency and (2) the relationship between complete denture quality and years of use. MATERIALS AND METHODS: A cross-sectional study was conducted with 93 edentulous patients (mean age: 65.6 years) wearing both mandibular and maxillary dentures. Patients were classified into two categories according to years of denture use: ≤ 2 years and ≥ 5 years. Masticatory efficiency was evaluated via the colorimetric method with beads as the artificial test food. A reproducible method for objective evaluation of the technical quality of complete dentures was employed. The association between denture quality and years of denture use was analyzed using chi-square and Fisher exact tests. The results of masticatory efficiency testing were analyzed using two-way analysis of variance (with the Tukey post hoc test) in terms of years of denture use (≤ 2 years, ≥ 5 years) and denture quality (poor, average, good). RESULTS: A significant relationship was found between denture quality and years of denture use (P < .05). Masticatory efficiency differed significantly (P < .05) between patients with ≤ 2 years of denture use (0.101 ± 0.076 absorbance) and ≥ 5 years of use (0.068 ± 0.076 absorbance). Masticatory efficiency was not influenced by denture quality. CONCLUSIONS: Complete denture quality and masticatory efficiency significantly decreased over time. However, complete denture quality did not influence masticatory efficiency.

Prevalência dos Traumas Buco-faciais em Pacientes Atendidos no Hospital Walfredo Gurgel (Natal-Rio Grande do Norte) / Prevalência dos Traumas Buco-faciais em Pacientes Atendidos no Hospital Walfredo Gurgel (Natal-Rio Grande do Norte) Prevalence of Oral-facial Trauma in Patients Attended at Hospital Walfredo Gurgel (Natal- Rio Grande do Norte)

Objetivo: Conhecer o perfil socioeconômico e as causas dos traumas faciais dos pacientes atendidos nos meses de janeiro a abril do ano 2009, no Hospital Walfredo Gurgel. Metodologia: A coleta de dados foi realizada no banco de dados do hospital, no final foram obtidas informações sobre o perfil dos pacientes ou bem como os tipos e as causas dos traumas bucomaxilofaciais. Resultados: Os traumas acometem mais homens com uma média de 25 anos de idade e residentes na zona oeste de Natal - RN. A maioria dos traumas ocorreu em tecido mole na região oral (quando excluídos os casos não especificados) e foram causados por quedas. Conclusão: Políticas públicas precisam ser instauradas, a fim de se minimizar o número de traumas assim como o efeito desses na vida das pessoas.

Porpuse: The aim of this study is to get to know the socio-economic profile and the causes of facial trauma of the patients treated in the months January to April of 2009, in the hospital Walfredo Gurgel. Metodology: Data collection was performed on the database of the hospital, where information was obtained about the profile of patients, as well as the types and causes of maxillofacial trauma. Results: The results showed that the traumas affecting more men with a mean of 25 years of age and residents in western Natal-RN. Most injuries were soft tissue in the oral region (excluding the cases when not specified) and were caused by falls. Conclusion: Public policies need to be introduced in order to minimize the number of injuries and the effect these people's lives.