The aim of this study was to evaluate, in vitro, the bending strength of internal fixation with absorbable and metallic screws in mandibular ramus sagittal split osteotomy in sheep hemimandibles. The screws were inserted as lag screws, with an inverted "L" configuration, and the set was submitted to bending strength tests. The load and displacement of the peak and final load averages were, respectively, 18.45 kgf, 8.19 mm and 14.38 kgf for Group I, and 16.67 kgf, 6.73 mm and 13.98 kgf for Group II. The results were submitted to statistical analysis by Student s t test and by the Pearson correlation analysis. The groups showed no statistically significant differences, indicating the feasibility of both for osteosynthesis in mandibular ramus sagittal split osteotomies.
SummaryPoly(methyloctylsiloxane) (PMOS), sorbed into the pores of HPLC silica particles by solvent evaporation, can function as a useful stationary phase for reversedphase chromatography. The present work addresses the question of how the PMOS is distributed in the pores. Measurements of the surface area (BET, N2) of a series of partially loaded samples (0-40 % PMOS, m/m) using a typical batch of HPLC silica (10 gm irregular particles with 6 nm pores) show that the specific surface area of the samples decreases linearly with the specific loading (mass of PMOS per gram of silica). This result is not consistent with a "film" model in which the PMOS is deposited uniformly on the pore walls, but is consistent with a model in which long segmented "plugs" of PMOS are deposited within the pore system.
Tenosynovial giant cell tumor of diffuse type (TGCT-d) or pigmented villonodular synovitis (PVNS) is a locally aggressive lesion that mostly affects the joints of long bones. Chondroid tenosynovial giant cell tumor (CTGCT) or PVNS with chondroid metaplasia is a rare distinct subset of synovial tumors that has a predilection for the TMJ. We report a rare case of CTGCT in the TMJ, initially misdiagnosed as temporomandibular disorder (TMD). A 51-year-old woman was referred to the surgeon with the chief complaint of TMJ pain for 5 years and a past history of an unsuccessful TMD treatment. Extraoral examination revealed discrete preauricular swelling and restricted mandibular range of motion. Panoramic radiograph and computerized tomography showed destruction of the mandibular fossa and condyle. Histologically, the tumor was composed by large mononuclear cells with prominent eosinophilic cytoplasm and grooved nuclei, small histiocytoid cells, osteoclast-like multinucleated cells, brown pigmentation and areas of chondroid metaplasia. Morphological and immunohistochemical characteristics lead to the final diagnosis of CTGCT. The rarity of CTGCT could be attributed to the lack of recognition of this lesion, with cases diagnosed as chondroblastomas, synovial chodromatosis and chondrosarcoma. The patient received immediate reconstruction and recurrence was found 22 months after initial intervention. TGCT-d and CTGCT of the TMJ can present similar symptoms to TMD, but clinicians must distinguish both lesions by complete examination, imaging and, when necessary, histopathologic evaluation.
Resumo: A cirurgia ortognática é o ramo da cirurgia bucomaxilofacial que trata das deformidades dentofaciais, buscando a correção da oclusão e melhora articular, respiratória e fonética, que geram benefícios funcionais e harmonizam a face, o que acarreta aspectos positivos em relação à estética e ao fator psicossocial do paciente. Objetivou-se avaliar a qualidade de vida desses pacientes, através dos aspectos funcionais, estéticos e psicossociais. O presente estudo foi realizado em clínica odontológica particular, na cidade de Taubaté. Foram avaliados 33 pacientes, 12 do gênero masculino e 21 do gênero feminino, com idades entre 18 a 45 anos, com tratamento ortocirúrgico indicado ou já realizado, utilizando-se os questionários Escala de Autoestima de Rosenberg/UNIFESP-EPM, Oral Health Impact Profile-14 -OHIP 14 e PIDAQ-Brasil/UNIFESP e o Teste não Paramétrico de Mann-Whitney. Os resultados evidenciaram que a cirurgia ortognática é um procedimento capaz de oferecer melhora da qualidade de vida para pacientes portadores de deformidades dentofaciais, por meio dos aspectos funcionais, estéticos e psicossociais. Palavras-chave: Cirurgia ortognática. Qualidade de vida. Anormalidades maxilofaciais. Autoestima. Saúde bucal. Abstract:The orthognathic surgery is the branch of oral and maxillofacial surgery that deals with the dentofacial deformities, seeking correction of the occlusion, and joint, respiratory and speech improvement, generating functional benefits and harmonizing the face, which leads to positive aspects of aesthetics and psychosocial factors of the patient. The objective was to evaluate the quality of life of patients through the functional, aesthetic and psychological aspects. This study was conducted in a private dental practice in Taubaté. We evaluated 33 patients, 12 males and 21 females, aged 18-45 years with orthosurgical treatment indicated or already accomplished, using the questionnaires Scale Rosenberg Self-Esteem/ UNIFESP-EPM, Oral Health Impact Profile-14 -OHIP14 and PIDAQ-Brasil/UNIFESP and the Non-parametric Test of Mann Whitney. The results showed improved self-esteem, lower impact of oral health problems on individual health and showed no significant difference in the improvement of dental aesthetics. Orthognathic surgery is a procedure capable of providing improved quality of life for patients with dentofacial deformities by means of functional, aesthetic and psychosocial factors. Keywords: Orthognatic surgery. Quality of life. Maxillofacial abnormalities. Self-esteem. Oral health.Resumen: La cirugía ortognática es la rama de la cirugía oral y maxilofacial que el cuidado de las deformidades dentofaciales, buscando la corrección de la oclusión, mejora la respiración conjunta y el habla, la generación de beneficios funcionales y la armonización de la cara, lo que conduce a los aspectos positivos de la estética y los factores psicosociales de el paciente. El objetivo fue evaluar la calidad de vida de los pacientes por medio de los aspectos funcionales, estéticos y psicológicos. Este estudio ...
A técnica indireta de anestesia do nervo alveolar inferior é utilizada para anestesiar todos os dentes da mandíbula.É efetuada pela penetração de um centímetro da agulha anestésica em um ponto situado acima da oclusal dosdentes inferiores, medialmente à linha milo-hióidea, com o corpo da seringa acompanhando o alinhamento dosdentes inferiores, do mesmo lado a ser anestesiado. Em um segundo tempo, a seringa é levada para o lado opostoda boca e então se procede o restante da penetração da agulha, objetivando atingir as proximidades do sulcomandibular. Este estudo investigou qual região dentária do lado oposto ao lado a ser anestesiado deve ser usadacomo referência no segundo tempo da técnica, de forma a permitir o êxito da anestesia. Um cursor metálico foiadaptado em cada uma das cem mandíbulas secas estudadas, de modo a simular o trajeto da agulha anestésica noprimeiro tempo da técnica, determinar o ponto de inserção da agulha e a localização de sua ponta no momentoem que o cilindro da seringa era deslocado para o lado oposto ao lado anestesiado. Posteriormente as mandíbulasforam fotografadas, as imagens obtidas digitalizadas e realizados traçados simulando a posição do corpo daseringa anestésica no momento da penetração da agulha nas proximidades do sulco mandibular. Embora a regiãode pré-molares inferiores seja citada, pela maioria dos autores, como referência no segundo tempo da anestesia,este estudo evidenciou maior prevalência da região de primeiro molar.
O objetivo da pesquisa, foi comprovar a acurácia e eficiência da utilização do Planejamento Virtual 3D em cirurgias ortognáticas, avaliando a precisão entre os pontos e planos de referência. Foram selecionados pacientes, sem levar em consideração variáveis de idade, gênero, raça, que apresentam discrepância facial, em maxilla, mandibula ou ambas, com necessidade de correção cirúrgica. Foram feitas Tomografias Computadorizadas (Cone Beam) no pré operatório, com técnica e sistemática padronizada pelo programa e serviço de diagnostico, confecção de modelos digitais, cefalometria 3D, planejamento cirúrgico virtual com tecnologia 3D protocolo COMPASS e os guias EFICIÊNCIA E ACURÁCIA NO PLANEJAMENTO 3D EM CIRURGIAS ORTOGNÁTICAS Capítulo 4 EFICIÊNCIA E ACURÁCIA NO PLANEJAMENTO 3D EM CIRURGIAS ORTOGNÁTICAS 58 cirúrgicos. Posteriormente realizadas as cirurgias ortognáticas, no pós operatório imediato foram solicitadas novas Tomografias Computadorizadas Cone Bean, com os mesmos padrões da TCCB inicial. Os pontos e planos selecionados como referência para comparação entre os planejamentos cirúrgicos e pós cirúrgicos, em um total dez planos. Realizadas as aferições pré e pós cirúrgicas, com os resultados obtidos, feitas as estatísticas de comparações de resultados para comprovação de eficiência e acurácia do planejamento 3D. A importância na realização desta pesquisa se fundamenta na comprovação da eficiência e acurácia da análise 3D, aumentando a precisão do planejamento cirúrgico, padronização dos guias cirúrgicos, conforto ao paciente pela eliminação de alguns procedimentos convencionais, e precisão no resultado cirúrgico proposto.
The installation of dental implants brings significant improvements in patient's quality of life, causing the demand for these procedures to increase. This growth results from the increasing use of innovative technologies in oral care. Since the 1970s, dental implants have continuously evolved, both in terms of shape and surface treatments. This evolution aims to improve osseointegration, an essential process for implant success, and prevent complications such as peri-implantitis. A necessary part of this evolutionary process is surface treatment on dental implants. This treatment improves implant surfaces' physical and chemical properties, promoting a more efficient interaction between the implant and surrounding tissues. To achieve this goal, modifications are made to the texture, composition, and characteristics of the implant surface. In this context, this study aims to identify the research gaps related to surface treatment on dental implants. To this end, a literature review was performed in the Scopus database using specific search terms related to this topic. The 20 most cited articles from 2017 to 2023, which address the main research trends in this area, were selected for analysis. The theoretical contribution of this study is to systematize the current research trends on the surface treatment of dental implants. This provides a better understanding of existing treatments and their limitations and presents ongoing studies that aim to overcome them. Furthermore, the research highlights studies under development, both in vitro and in vivo, that seek to apply scientific advances in clinical practice to improve implant outcomes. This applied contribution is relevant, as it can positively impact clinical practice and benefit patients.
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