This study evaluated the effect of low-level laser therapy (LLLT) on the chemical composition, crystallinity and crystalline structure of bone at the site of distraction osteogenesis. Five rabbits were subjected to distraction osteogenesis (latency = 3 days; rate and frequency = 0.7 mm/day for 7 days; consolidation = 10 days), and three were given LLLT with arsenide-gallium-aluminum (AsGaAl; 830 nm, 40 mW): 10 J/cm(2) dose per spot, applied directly to the distraction osteogenesis site during the consolidation stage at 48 h intervals. Samples were harvested at the end of the consolidation stage. X-ray fluorescence and X-ray diffraction were used to analyze chemical composition, crystallinity and crystalline structure of bone at the distraction osteogenesis site. The analysis of chemical composition and calcium (Ca) and phosphorus (P) ratios revealed greater mineralization in the LLLT group. Diffractograms showed that the crystalline structure of the samples was similar to that of hydroxyapatites. Crystallinity percentages were greater in rabbits that were given LLLT. Crystallinity (41.14% to 54.57%) and the chemical composition of the bone at the distraction osteogenesis site were similar to the that of the control group (42.37% to 49.29%). The results showed that LLLT had a positive effect on the biomodulation of newly formed bone.

This in vitro study evaluated the effect of different apicoectomy angles, instruments used in root-end preparation, and dental materials used in retrofilling on apical sealing. Root ends were resected at 45 or 90 degrees in 80 single-rooted teeth. For each type of apicoectomy, root-end cavities were prepared with either a round carbide #2 bur or an S12/90D ultrasonic tip. The root-end cavities in each subgroup (apicoectomy + root-end preparation) were filled with silver amalgam without zinc (Am) or with gray mineral trioxide aggregate -Angelus (MTA), and the specimens were immediately immersed in 0.2% rhodamine B for 24 h. Sealing was evaluated based on the dyed crosssectional dentin area. Data were analyzed statistically by the Kruskal-Wallis test at 5% significance level. No group showed complete sealing of root-end areas. The only significant factor affecting microleakage was dental material, with MTA exhibiting less leakage.

Background To assess the efficacy of PBMT on reducing postoperative pain scores in patients submitted to third molar extractions. Material and Methods A randomized controlled trial (ReBEC:RBR-94BCKZ) was designed according to the SPIRIT and followed the CONSORT. Patients were randomly allocated according to control or PBMT groups. PBMT consisted of the application of GaAlAs laser (808nm;50mW) applied in six points (1.23 min;11 J/cm2) after extraction. Pain scores were assessed using the Visual Analogue Scale (VAS) in millimeters evaluated after 6 (T6), 24 (T24), and 48 (T48) hours. The Wilcoxon Mann–Whitney test was used to check for possible associations between VAS scores and treatment groups. Results A total of 101 third molar extractions were performed in 44 patients. The mean age was 28 years old(SD±11.54). Comparing control and intervention, PBMT group showed a significant effect on the reduction of postoperative pain at T6(mean VAS=0.9; C.I:0.63–1.16) compared to control (mean VAS=2.5;C.I:2.1–2.88)( p <0.001). The same statistically significant effect on the reduction of postoperative pain was observed at T24 (PBMT mean VAS=0.72;C.I:0.51–0.93; control mean VAS=2.86;C.I:2.40–3.31; p <0.001) and T48 (PBMT mean VAS=0.64;C.I:0.36–0.92; control mean VAS=2.86;C.I:2.37–3.34; p <0.001). Conclusions PBMT significantly reduce the postoperative pain scores when assessed 6, 24, and 48 hours after third molar extractions. Key words: Controlled clinical trial, gallium aluminium arsenide lasers, third molar.

ResumoA obturação do canal radicular simultânea ao ato cirúrgico está indicada nos casos em que o tratamento endodôntico convencional fracassou, não havendo regressão da lesão periapical, ou quando não é possível a obturação dos canais radiculares devido à presença de exsudação persistente. O presente caso clínico visa a relatar a técnica de obturação do canal radicular simultânea ao ato cirúrgico, bem como enfatizar os passos operatórios a serem seguidos para obtenção do sucesso operatório.Palavras-chave: apicectomia; obturação radicular; cirurgia perirradicular.

Objetivo: Descrever as ações do projeto extensão denominado de Centro de Estudos, Tratamento e Acompanhamento de Traumatismos em Dentes Permanentes (CETAT), onde são realizados atendimentos clínicos a pacientes portadores de injúrias dentais traumáticas (IDTs), junto à comunidade de Pelotas e região, fazendo uma reflexão sobre a interrupção da prestação do serviço às pessoas causada pela pandemia do coronavírus. Metodologia: É realizada a contextualização do projeto, de suas principais atuações e indicadores das atividades realizadas, bem como do momento atual de pandemia que está sendo vivenciado no mundo e na cidade de Pelotas. Também é relatada a inserção de uma ação de ensino vinculada ao projeto, denominada “CETAT- em casa”, articulada para este momento, que tem por objetivo aproximar os participantes do projeto, discutir a situação do público-alvo e aprofundar o conhecimento teórico-científico no tema, criando estratégias para aprimorar o serviço, no momento do retorno presencial. Já foram realizados diversos encontros remotos, com apresentação de seminários, palestras, casos clínicos e reuniões para tentar articular ações que possam contornar o problema causado pela falta de atendimento nas clínicas da Faculdade de Odontologia. Conclusões: A interrupção da prestação de serviço à comunidade é preocupante, pois poucos serviços públicos ofertam o atendimento aos pacientes com traumatismo em dentes permanentes, que supram das suas necessidades de tratamento odontológico. Sabe-se que novos desafios virão pela frente, mas esta primeira experiência pôde fortalecer a equipe para criar estratégias de ação futuras que possam contornar muitas situações adversas causadas pela pandemia.