Effect of epigallocatechin-3- gallate solutions on bond durability at the adhesive interface in caries-affected dentin.

Hydrolytic and enzymatic degradation by matrix metalloproteinases (MMPs) reduces the durability of composite resin restorations on caries-affected dentin (CAD). The use of MMP inhibitors such as epigallocatechin-3-gallate (EGCG) could increase the longevity of the bond to dentin. This study aimed to evaluate the use of EGCG at different aqueous concentrations on the resin-dentin microtensile bond strength (µTBS), fracture pattern and nanoleakage (NL) in immediate (IM) time interval and after 12-months of water storage (1Y) when using a two-step etch-and-rinse adhesive system on CAD. Dentin surfaces of 40 human molars were submitted to a microbiological caries induction protocol and randomized into 5 groups (n = 8) (0.02% EGCG; 0.2% EGCG; 0.5% EGCG; 2% Chlorhexidine [CHX] and no treatment as Control Group - [NT]). After acid etching, the solutions were applied for 60 s followed by application of dental adhesive (Adper Single Bond 2, 3 M ESPE) to CAD surfaces. Subsequently, a resin composite (4 mm) block was built on the dentin. After 24 h, the teeth were sectioned into beam-shaped specimens (cross-sectional area of 1 mm2 and 8-mm high). Half of the specimens were tested in IM and the other half after 1Y. Two samples per tooth were submitted to SEM for NL evaluation. Data were statistically analyzed by two-way ANOVA and Tukey tests (α = 0.05). The results showed that use of EGCG and CHX did not affect µTBS in IM (p > 0.05). After 1Y, there was a reduction in µTBS for all experimental groups (p < 0.05). Adhesive fractures predominated in IM in all groups, except for 0.05% EGCG and NT. After 1Y, there was an increase in these adhesive fractures in all groups. For NL, all agents applied reduced NL in comparison with CT (p < 0.001). CHX showed lower NL (p < 0.001), followed by 0.02% and 0.5% EGCG. NT showed highest NL for both time intervals (p < 0.001). Thus, although the use of EGCG at different concentrations and CHX reduced the NL, they were unable to reduce degradation of µTBS to CAD over time.

Relationship between facial morphology, anterior open bite and non-nutritive sucking habits during the primary dentition stage.

INTRODUCTION: Non-nutritive sucking habits can cause occlusal alterations, including anterior open bite. However, not all patients develop this malocclusion. Therefore, the emergence of AOB does not depend on deleterious habits, only. OBJECTIVE: Investigate a potential association between non-nutritive sucking habits (NNSHs), anterior open bite (AOB) and facial morphology (FM). METHODS: 176 children in the primary dentition stage were selected. Intra and extraoral clinical examinations were performed and the children's legal guardians were asked to respond to a questionnaire comprising issues related to NNSHs. RESULTS: A statistically significant relationship was found between NNSHs and AOB. However, no association was found between these factors and children's facial morphology (FM). CONCLUSIONS: Non-nutritive sucking habits during the primary dentition stage play a key role in determining anterior open bite malocclusion regardless of patient's morphological facial pattern.

Relationship between facial morphology, anterior open bite and non-nutritive sucking habits during the primary dentition stage

INTRODUCTION: Non-nutritive sucking habits (NNSHs) can cause occlusal alterations, including anterior open bite (AOB). However, not all patients develop this malocclusion. Therefore, the emergence of AOB does not depend on deleterious habits, only. OBJECTIVE: Investigate a potential association between non-nutritive sucking habits (NNSHs), anterior open bite (AOB) and facial morphology (FM). METHODS: 176 children in the primary dentition stage were selected. Intra and extraoral clinical examinations were performed and the children's legal guardians were asked to respond to a questionnaire comprising issues related to non-nutritive sucking habits (NNSHs). RESULTS: A statistically significant relationship was found between non-nutritive sucking habits (NNSHs) and anterior open bite (AOB). However, no association was found between these factors and children's facial morphology (FM). CONCLUSIONS: Non-nutritive sucking habits (NNSHs) during the primary dentition stage play a key role in determining anterior open bite (AOB) malocclusion regardless of patient's morphological facial pattern (FM). .

INTRODUÇÃO: os hábitos de sucção não nutritiva podem causar alterações oclusais, como, por exemplo, a mordida aberta anterior (MAA). No entanto, nem todos os pacientes desenvolvem essa má oclusão. Sendo assim, a instalação da MAA não depende apenas da ocorrência do hábito. OBJETIVO: avaliar a possível associação entre hábito de sucção não nutritiva, mordida aberta anterior e morfologia facial. MÉTODOS: foram selecionadas 176 crianças na fase de dentição decídua completa. Exames clínicos intra- e extrabucais foram realizados, e um questionário, com aspectos relacionados aos hábitos de sucção não nutritiva, foi aplicado aos responsáveis. RESULTADOS: encontrou-se uma relação estatisticamente significativa entre as variáveis hábito de sucção não nutritiva e MAA. Entretanto, não houve associação desses fatores com a morfologia facial da criança. CONCLUSÃO: a presença dos hábitos de sucção não nutritiva tem associação para a determinação da má oclusão de MAA, independentemente do padrão facial morfológico na dentição decídua. .

Harmonização estética do sorriso com laminados cerâmicos / Esthetic harmony of the smile with porcelain laminate veneers

Atualmente, observa-se grande valorização da estética do sorriso, o qual representa significativa influência no comportamento psicossocial do paciente. Dentre os materiais odontológicos utilizados, os laminados cerâmicos apresentam excelentes propriedades ópticas e podem ser empregados com previsibilidade e segurança, sem necessidade de desgastes da estrutura dental. O objetivo deste trabalho é apresentar um caso clínico em que, após a verificação da insatisfação estética dos dentes, relatada pela paciente, foi planejada a confecção de seis laminados cerâmicos. Os laminados cerâmicos confeccionados a partir de vidro ceramizado à base de dissilicato de lítio foram cimentados sobre o esmalte não desgastado, recriando uma nova dimensão aos dentes anteriores. Foi possível concluir que, por meio de uma análise estética minuciosa e a elaboração de um planejamento criterioso, o emprego de laminados cerâmicos garantiu o resultado estético almejado pela paciente e equipe odontológica.

Today, people value the smile esthetics, and this strongly influences the psychosocial behavior of the population. Among the available dental materials, porcelain laminate veneers have excellent optical properties and can be used safely and predictably without significant wear of the dental tissues. The aim of this study was to report a case where the patient complained about the esthetics and it was planned the fabrication of six porcelain laminate veneers. Lithium disilicate glass-ceramic laminate veneers were bonded to enamel without wear, rebuilding the predominance of the anterior teeth. It was concluded that after a thoughtful esthetic analysis and a thorough treatment planning, the desired esthetic result for the patient and dental team can be obtained with the use of laminate veneers.