Aim: To evaluate enamel microhardness and morphology after bleaching with hydrogen peroxide containing calcium in different concentrations. Methods: One hundred specimens of human teeth were ground and polished and had the initial microhardness evaluated. The specimens were randomly assigned into five groups (n=20): Group 1 -Control group (no treatment); Group 2 -Home Peroxide 6% (without calcium); Group 3 -Home Peroxide 7.5% (without calcium); Group 4 -White Class 6% (with calcium); Group 5 -White Class 7.5% (with calcium). For each group, the bleaching was performed according to the manufacturer's specifications. The specimens were bleached once a day for 5 days and subjected to pH cycling. Microhardness and scanning electron microscopy (SEM) analysis were performed before and after bleaching. Results: The results showed that groups submitted to bleaching treatment presented hardness loss compared to the control group. The group of 7.5% hydrogen peroxide with calcium showed a lower percentage of hardness loss in relation to other groups. Conclusion: Calcium in association with a higher hydrogen peroxide concentration may decrease microhardness changes on enamel.

Background Juvenile psammomatoid ossifying fibroma is a rare variant of conventional ossifying fibroma that affects the maxillofacial complex in children and adolescents. It is a benign fibro-osseous neoplasm with aggressive clinical behavior and high recurrence rates, confirming the importance of early diagnosis and intervention to minimize undesirable aesthetic and functional possibilities resulting from surgical management, and added to the use of laser therapy, it can bring a better postoperative prognosis. Aim To present the surgical removal of a juvenile psammomatoid ossifying fibroma, with the associated use of low-intensity laser and photodynamic therapy in a oncological patient. Case presentation This case describes a senile cancer patient diagnosed with rapidly progressive and painful juvenile ossifying fibroma involving the inter-radicular region of the right maxilla. The treatment was excision with total tumor resection, photodynamic therapy and low-intensity laser follow-up of 48 months. Conclusions Juvenile psammomatoid ossifying fibroma is a lesion with a high rate of recurrence and aggressive growth. Thus, early detection and treatment are essential. In this case, the use of photodynamic therapy after surgery and long-term follow-up with low-intensity laser brought a favorable prognosis in an oncology patient.

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Objetivo: avaliar as informações disponíveis no site de buscas Google® sobre a relação entre a odontologia e a infecção pelo novo Coronavírus, e sua concordância com a literatura atual. Material e Métodos: estudo descritivo e observacional, realizado em uma universidade privada em Rio de Janeiro, Brasil, através da utilização da plataforma de buscas Google® aonde analisou-se os sites através de um roteiro de perguntas previamente elaborado. Resultados: foram analisados 67 sites após buscas pelas expressões “Coronavírus e odontologia”, “Saúde bucal e Coronavírus” e “Fratura de dente e Coronavírus”. Apenas 24,2% das perguntas foram respondidas com conteúdo completo enquanto 62,5% não apresentavam os conteúdos e 13,3% simplesmente os citavam sem dar maiores esclarecimentos. Apesar disso, 99% dos conteúdos foram publicados por fontes confiáveis (órgãos renomados, sites privados de profissionais da saúde bucal ou matérias de jornal assessoradas por estes). Conclusão: Apesar de confiáveis, os resultados das buscas apresentaram pequena quantidade de informações que realmente auxiliariam o leigo no entendimento da relação entre Coronavírus e odontologia, o que demonstra a necessidade de criação de canais oficiais para disseminação destas para o público geral