The classification of traumatic dental injuries can involve teeth, supporting structures, or gingival and oral mucosa. The therapeutic use of lasers has become standard practice in many medical fields, but dental traumatology is not yet one of them. This case report relates dental trauma of a 36-month-old girl referred to the Dental Trauma Center for Children and Adolescents in a University dental clinic (Brazil). Her fall down the stairs at home resulted in face trauma, avulsion of a primary incisor and soft tissue injuries. The mother reported pain and inflammation of the lacerated lip. After examination, a low-level laser was applied to ulcerated lip and gingival tissues. The protocol was punctual and continuous application at 660nm, 1J/point every 48 hours. The low-level laser biomodulation capacity provided complete tissue healing after 14 days of sessions. Clinical trials are suggested. Conservative treatment in this case of severe soft-tissue injuries into a baby showed a clinically satisfactory result. Minimal intervention was also important to minimize possible psychological side effects of surgical dental therapy. Low-level lasers are an excellent alternative therapy for children, because of their analgesic/anti-inflammatory and biomodulatory effects.
Objetivo: Avaliar a influência da técnica de acabamento e polimento na rugosidade superficial de dois compósitos. Materiais e Métodos: Foram confeccionados 40 corpos de prova cilíndricos de 8mmX2mm, distribuídos em 4 grupos, conforme o tipo de resina composta: Filtek Z250 (3MESPE) para os grupos G1 e G2 e P60 (3M ESPE) para G3 e G4. Os cilindros receberam acabamento inicial com lixa de óxido de alumínio (granulação 400) em politriz por 30s sob irrigação e foi realizada a leitura inicial da topografia de superfície (Ra, μm) com rugosímetro. Em seguida, cada grupo recebeu seu respectivo método de acabamento e polimento final: G1 e G3 (técnica com materiais comercialmente disponíveis), Discos Sof-Lex em sequência decrescente de abrasividade (3M ESPE) e G2 e G4, (técnica alternativa), lixas de óxido de alumínio granulação 2000 e 2500 (Norton®). Após, uma segunda leitura da rugosidade superficial foi realizada, e os dados obtidos foram analisados estatisticamente (ANOVA/Tukey; α=0,05).Resultados: Houve interação significativa entre os fatores grupo x tempo (p=0,04). Todos os métodos de acabamento e polimento resultaram em redução da rugosidade superficial. Apesar de previamente ao acabamento e polimento a resina composta P60 apresentar maior rugosidade superficial comparada à Z250; após a realização deste procedimento, suas topografias de superfície apresentam lisura semelhante. Conclusão: Concluiu-se que lixas de óxido de alumínio podem se apresentar como alternativa de baixo custo à materiais comercialmente disponíveis, sendo eficazes para obtenção de superfícies lisas. Purpose: To evaluate the influence of the finishing and polishing technique on the surface roughness of two composites. Methods: Forty cylindrical specimens of 8mmX2mm were made, distributed in 4 groups, according to the type of composite resin: Filtek Z250 (3MESPE) for groups G1 and G2 and P60 (3M ESPE) for G3 and G4. The cylinders were initially finished with aluminum oxide sandpaper (400 grit) in a polishing machine for 30s under irrigation and the initial surface topography (Ra, μm) was read with a rugosimeter. Then, each group received its respective method of finishing and final polishing: G1 and G3 (technique with commercially available materials), Sof-Lex discs in decreasing abrasion sequence (3M ESPE) and G2 and G4, (alternative technique), 2000 and 2500 granulation aluminum oxide sandpaper (Norton®). Afterwards, a second reading of the surface roughness was performed, and the obtained data were statistically analyzed (ANOVA / Tukey; α = 0.05). Results: There was a significant interaction between the factors group x time (p = 0.04). All finishing and polishing methods resulted in a reduction of surface roughness. Although prior to finishing and polishing, the composite resin P60 has a higher surface roughness compared to the Z250; after performing this procedure, their surface topographies show similar smoothness. Conclusion: It was concluded that aluminum oxide sandpaper can be presented as a low cost alternative to commercially available materials, being effective for obtaining smooth surfaces.
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