Estudo da viabilidade do processo de reciclagem do material descartado do sistema Zirkonzanh® de produção de próteses dentárias

At present, the material of choice for performing aesthetic dental prosthetic work is in the ceramic. Among them, the ceramic base of stabilized zirconia with 3% yttria (3Y - TZP) stand out for having excellent physical and mechanical properties. During the machining of blocks of zirconia in the laboratory to prepare the various types of prostheses, much of the material is given off in the form of powder, which is subsequently discarded. The waste of this material results in financial loss, reflecting higher final cost treatment for patients, as well as damage to the environment, thanks to the processes involved in the manufacture and disposal of the ceramic. This research, pioneered the recycling of zirconium oxide powder obtained during milling of dental crowns and bridges, we highlight the social and environmental aspects and aims to establish a protocol for the reuse of waste (powder of zirconia Zirkonzahn® system) discarded to obtain a new block of compacted zirconia to maintain the same mechanical and microstructural properties of commercial high-cost imported material. To compare with the commercial material, samples were uniaxially (20 MPa) and isostatically (100 MPa), and its mechanical and microstructural characterization was performed through tests of density, porosity, dilatometry, X-ray diffraction (XRD), hardness, fracture toughness, resistance to fracture electron microscopy (SEM) and analysis of grain size. The results observed in the samples were isostatically pressed similiares those obtained with samples from the commercial material demonstrating the viability of the process

Emprego da imunofluorescência direta no estudo das alterações de mucosa de palato, compatíveis com candidíase atrófica crônica, em indivíduos portadores de próteses dentárias totais muco-suportadas.

Histopathology by hematoxilin-eosin (HE) and periodic acid Schiff (PAS), concomitant direct immunofluorescence (DI) against total human immunoglobulins and against Candida albicans, was effectuated in 25 persons dentures wearers. In 5 persons without chronic athrofic candidiasis (CAC) clinical signals in the palate the HE showed wise inflammatory elements in the connective tissue and the PAS marked the continuous basal layer, the intra-cellular grains of granular layer and the uniform parakeratin on epithelial surface. In 20 others, with palatal signals of CAC, in the HE was frequent the features encountered in Candida infected and PAS revealed, beside descontinuous lamina basal and epithelial surface covered by tide and discontinuous parakeratin, the presence of round bodies few largers that presents in the granular layer, casually isolated in the medial portion of ret pegs and connective papillae. In the first 5 persons the DI against total human immunoglobulins not showed signals of the humoral immunologic phenomena, the same was valid to others 20 patients with CAC clinical aspects. However the DI with conjugate against C. albicans in the 20 cases with CAC signals revealed suitable aspects of the structures assumed by Candida in tissues. Cultures of samples obtained of the persons with CAC signals was positive in 100% to Candida, 70% presumptively albicans, against 80% of positiviness to generus Candida, 67% presumptively albicans, in the persons without CAC signals.

Caracterização microestrutural e resistência à corrosão de ligas Ni-Cr-Mo refundidas utilizadas em próteses dentárias

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise numérica de interfaces de próteses dentárias através da mecânica do dano

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise fotoelástica da tensão entre diferentes tipos de sistemas de retenção em próteses obturadoras palatinas implanto-retidas ou não e com ou sem reembasamento “soft”

Pós-graduação em Odontologia - FOA

Estudo da corrosão das ligas Ni-Cr-Mo para próteses dentárias fixas em solução aquosa de NaF 0,05% , NaCl 0,05% e em colutórios comerciais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização microestrutural e resistência à corrosão de ligas Co-Cr-Mo utilizadas em próteses dentárias

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo da viabilidade do processo de reciclagem do material descartado do sistema Zirkonzanh® de produção de próteses dentárias

At present, the material of choice for performing aesthetic dental prosthetic work is in the ceramic. Among them, the ceramic base of stabilized zirconia with 3% yttria (3Y - TZP) stand out for having excellent physical and mechanical properties. During the machining of blocks of zirconia in the laboratory to prepare the various types of prostheses, much of the material is given off in the form of powder, which is subsequently discarded. The waste of this material results in financial loss, reflecting higher final cost treatment for patients, as well as damage to the environment, thanks to the processes involved in the manufacture and disposal of the ceramic. This research, pioneered the recycling of zirconium oxide powder obtained during milling of dental crowns and bridges, we highlight the social and environmental aspects and aims to establish a protocol for the reuse of waste (powder of zirconia Zirkonzahn® system) discarded to obtain a new block of compacted zirconia to maintain the same mechanical and microstructural properties of commercial high-cost imported material. To compare with the commercial material, samples were uniaxially (20 MPa) and isostatically (100 MPa), and its mechanical and microstructural characterization was performed through tests of density, porosity, dilatometry, X-ray diffraction (XRD), hardness, fracture toughness, resistance to fracture electron microscopy (SEM) and analysis of grain size. The results observed in the samples were isostatically pressed similiares those obtained with samples from the commercial material demonstrating the viability of the process

Como realizar o selamento periférico e a moldagem funcional?

The functional impression technique is one of the most important steps for complete and/or partial edentulism treatment. So, correct analysis and record of supporting structures are essential to determine the denture extension. The functional impression technique has two stages - a customized final impression tray and a border impression - which aims to record the optimal denture supporting area. The aim of this study was to review the literature related to border impression and functional impression techniques, describing the technique and materials, and identifying the procedure’s objectives and function.

Diagnóstico e tratamento da xerostomia

Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz

Análise fotoelástica de tensões em próteses obturadoras palatinas implantorretidas, sobre implantes paralelos ou inclinados, associados a diferentes tipos de sistemas de retenção

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Próteses parciais removíveis associadas a encaixes: implicações clínicas e laboratoriais

Nowadays, the fixed partial dentures and/or dental implants is the most requested treatmentby the majority of partially edentulous patients. However, depending on the periodontal condition of the remaining teeth, as well as the bone condition of the prosthetic space, the oral rehabilitation with these treatments may be limited or even contraindicated. In such cases, the use of removable partial dentures associated to attachments becomes an important alternative for aesthetic and functional rehabilitation. Attachments are mechanical devices consisted of two parts (patrix-matrix), one placed inside another, which act as direct retainer, providing retention, support and stability to the dentures. These devices can be classified as intra or extracoronal attachments, considering their position in relation to the abutment tooth. However, regardless the type of attachment, the association between fixed and removable partial dentures should be performed respecting the biomechanical principles of both. Therefore, the purpose of this study was to review and discuss the literature about the clinical and laboratory implications of the association between fixed and removable partial dentures by means of attachments.

Avaliação clínica e radiográfica das complicações técnicas em próteses sobre implantes

The evaluation criteria of the cases treated with dental implants are based on clinical and radiographic tests. In this context it is important to conduct research to determine prognosis of different types of prosthetic rehabilitation and determination of the main problems affecting this type of treatment. Thus, the objective of this study was to assess the prosthetic conditions of individuals rehabilitated with implant-supported prosthesis. In this cross-sectional study 153 patients were treated, accounting for a sample of 509 implants. The failures were observed by clinical and radiographic examination. The results showed that the fracture (0.2%) loss (0.4%) and loosening of the screws (3.3%) were failures are less frequent. The fracture structures as the resin (12.4%), porcelain (5.5%) and metallic (1.5%), loss of resin that covers the screw (23.8%) and loss of retention overdentures on implants (18.6%) had a higher occurrence. The failure of adaptation between the abutment and the implant (6.9%) and especially between the prosthesis and the abutment (25.4%) had a high prevalence and, when related to other parameters showed a significant association, particularly with the cemented prosthesis (OR = 6.79). It can be concluded that to minimize the appearance of failures, protocols must be observed from diagnosis to the settlement and control of prostheses on implants, particularly with respect to technical steps of the making of the prosthesis and care in radiographic evaluating the fit between their components

Análise estrutural dos efeitos da desadaptação em componentes de próteses odontológicas utilizando o método dos elementos finitos com elemento de contato e pré-carga

Pós-graduação em Engenharia Mecânica - FEB

Hipertonicidade muscular e confecção de próteses totais pela técnica da zona neutra: relato de caso clínico

Introduction: the oral rehabilitation in edentulous patients using removable complete dentures is a classic treatment, easily accessible, and presenting satisfactory results. However, to succeed in this type of treatment, stability is an extremely important factor. The neutral zone technique for the production of complete dentures determines the oral cavity space for the positioning of teeth and denture base that provide a neutralization of the forces delivered by lips, cheeks, and tongue, providing better stability and retention of prostheses, which is indicated in cases with history of difficulties in adapting the conventional mandibular denture. Objective and case report: this paper aimed to describe a clinical case report of the oral rehabilitation of a patient with paraprosthetic muscles hypertonicity through removable complete dentures produced by the neutral zone technique, using condensation silicone. Final considerations: the use of condensation silicone for the development of the neutral zone technique showed to be a good alternative for the development of this clinical case, providing satisfactory stability and retention of the complete mandibular denture.