Evaluation of sealing between abutment and inner connection of cone morse dental implant: microgaps between implant and abutment

Introdução: Aspectos biomecânicos relacionados à adaptação de próteses fixas sobre implantes estão diretamente asso­ciados ao sucesso do tratamento. Objetivo: Avaliar in vitro a presença de microgaps na união formada pelo pilar e a conexão interna do implante dentário Cone Morse. Materiais e método: Dois grupos de implantes foram analisados. O primeiro grupo (n = 16) utilizou materiais (implantes e pilares) do mesmo fabricante, enquanto o segundo grupo (n = 16) utilizou materiais de diferentes fabricantes. Os conjuntos foram enviados para o microscópio eletrônico de varredura, onde foram tomadas as medidas dos microgaps formados entre a conexão do implante e o pilar. Resultados: Os resultados obtidos foram submetidos à avaliação estatística (Mann-Whitney-U) das medidas de dispersão e à tendência central dos valores (desvio padrão e médio). No grupo 1, a média encontrada foi de 5,69 μm e o desvio padrão (SD) foi de 8,46 μm. O grupo 2 apresentou média de 1,24 μm e SD: 0,44 μm. A diferença encontrada foi estatistica­mente significativa (p = 0,002). Conclusão: Dentro da limitação deste estudo, os resultados indicam que o grupo formado por implante e abutment de diferentes fabricantes oferece menores valores de microgaps e, portanto, uma melhor adaptação in vitro de componentes. DESCRITORES | Implantes Dentários; Dente Suporte; Microscopia Eletrônica de Varredura.Introduction: The adaptation of prostheses fixed over implants involves biomechanical aspects that are directly associated with treatment success. Objective: The aim of this in vitro study was to evaluate the presence of microgaps in the abutment/inner connection interface of cone morse dental implants. Materials and methods: Two groups of implants were analyzed. The first group (n = 16) employed single-manufacturer dental implants and abutments, whereas the second group (n = 16) combined multi-manufacturer materials. The sets were analyzed through scanning electron mi­croscopy, wherein microgaps between the implant connection and the abutment were observed. Results: Group 1 had an average microgap of 5.69 μm (SD ± 8.46 μm). Group 2 had an average microgap of 1.24 μm (SD ± 0.44 μm). A significant difference was found between the two groups (p = 0.002). Conclusion: Within the limitations of this study, results suggest that the group formed by multi-manufacturer implants and abutments (group 2) had smaller microgap values, and, therefore, a higher in vitro adaptation of components. DESCRIPTORS | Dental Implants; Dental Abutments; Scanning Electron Microscopy

Plasma cell cheilitis: the diagnosis of a disorder mimicking lip cancer

Plasma cell cheilitis (PCC) is an inflammatory disorder of unknown etiology that affects the lip. It is characterized histologically by a dense infiltrate of plasma cells with a variety of clinical features. The response to different therapeutic modalities is controversial, especially regarding the effectiveness of corticosteroids. We present a case of a 56-year-old Caucasian man with a painful ulcerated and crusted area in the lower lip, resembling a squamous cell carcinoma or actinic cheilitis. Topical corticosteroid was used for one week, which resulted in partial regression and motivated a biopsy. The histological examination provided the diagnosis of PCC. The patient has been disease-free for six months. We also provide a discussion on the criteria of differential diagnosis and management of this rare condition. See ERRATUM&nbsp