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1.
J Prosthodont ; 29(3): 269-271, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32065435

RESUMO

In order to provide restorations and dental prostheses that are esthetically pleasing, functional and in harmony with a patient's occlusion, practitioners must have a thorough knowledge of dental anatomy. Recent studies have shown that virtual three-dimensional (3D) models greatly enhance educational outcomes in dental anatomy courses. This article describes a novel educational technique and uses videos and web-based portals to demonstrate how to create a virtual 3D tooth model from a scan of a natural tooth for use in dental anatomy courses.


Assuntos
Modelos Dentários , Prótese Dentária , Oclusão Dentária , Humanos , Imagem Tridimensional , Estudantes
2.
Clin Oral Investig ; 24(2): 701-710, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31127429

RESUMO

OBJECTIVE: To investigate the impact of 3D print material, build direction, post-curing, and artificial aging on fracture load of fixed dental prostheses (FDPs). MATERIALS AND METHODS: Three-unit FDPs were 3D-printed using experimental resin (EXP), NextDent C&B (CB), Freeprint temp (FT), and 3Delta temp (DT). In the first part, the impacts of build direction and artificial aging were tested. FDPs were manufactured with their long-axis positioned either occlusal, buccal, or distal to the printer's platform. Fracture load was measured after artificial aging (H2O: 21 days, 37 °C). In the second part, the impact of post-curing was tested. FDPs were post-cured using Labolight DUO, Otoflash G171, and LC-3DPrint Box. While the positive control group was milled from TelioCAD (TC), the negative control group was fabricated from a conventional interim material Luxatemp (LT). The measured initial fracture loads were compared with those after artificial aging. Each subgroup contained 15 specimens. Data were analyzed using Kolmogorov-Smirnov test, one-way ANOVA followed by Scheffé post hoc test, t test, Kruskal-Wallis test, and Mann-Whitney U test (p < 0.05). The univariate ANOVA with partial eta squared (ηP2) was used to analyze the impact of test parameters on fracture load. RESULTS: Specimens manufactured with their long-axis positioned distal to the printer's platform showed higher fracture load than occlusal ones (p = 0.049). The highest values were observed for CB, followed by DT (p < 0.001). EXP showed the lowest values, followed by FT (p < 0.001). After artificial aging, a decrease of fracture load for EXP (p < 0.001) and DT (p < 0.001) was observed. The highest impact on values was exerted by interactions between 3D print material and post-curing unit (ηP2 = 0.233, p < 0.001), followed by the 3D print material (ηP2 = 0.219, p < 0.001) and curing device (ηP2 = 0.108, p < 0.001). CONCLUSIONS: Build direction, post-curing, artificial aging, and material have an impact on the mechanical stability of printed FDPs. CLINICAL RELEVANCE: The correct post-curing strategy is mandatory to ensure mechanical stability of 3D-printed FDPs. Additively manufactured FDPs are more prone to artificial aging than conventionally fabricated ones.


Assuntos
Materiais Dentários , Prótese Dentária , Falha de Restauração Dentária , Análise do Estresse Dentário , Teste de Materiais , Impressão Tridimensional
3.
J Forensic Sci ; 65(1): 304-313, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31145812

RESUMO

In 1949, the American Graves Registration Service Pacific Zone proposed the identification of 27 sets of remains (skulls/crania/mandibles) based on comparisons with written dental records. All were denied, and the remains were buried as unknowns. In 2003 and 2015, the remains were exhumed by the DPAA. Currently, 26 individuals previously recommended for identification have been positively identified. The DPAA Science Director's opinion corresponded with 24 of their recommendations, while DNA excluded three. Caution should be taken by the forensic scientist when building assemblages through skeletal and dental articulation. The forensic odontologist must always consider variations in restorative care/extraction patterns and the possibility of documentation errors when reviewing/interpreting historical and current day dental records used for AM/PM comparisons. The odontologist should base their opinion on the strength of the antemortem/postmortem comparison, number and type of concordances, and distinct dental care and extraction patterns.


Assuntos
Restos Mortais , Registros Odontológicos , Odontologia Legal/métodos , Amálgama Dentário , Prótese Dentária , Exumação , História do Século XX , Humanos , Mandíbula/patologia , Maxila/patologia , Militares/história , Fotografação , Radiografia Dentária , Dente/patologia , Estados Unidos , II Guerra Mundial
4.
Arch Oral Biol ; 109: 104577, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31606567

RESUMO

Although the effectiveness of some mouthwashes has been proven, phytotherapy is still a field to be explored as an alternative to commercial products. OBJECTIVE: To evaluate, in vitro, the cytotoxicity and efficacy of two solutions based on citronella oil (CN), on S. aureus and C. albicans biofilms (in formation-adhesion phase and 24 h-biofilm formation) on acrylic resin and nickel-chromium alloy samples (one trademark of each material), compared to two alcohol-free commercial mouthwashes. MATERIAL AND METHODS: Two solutions containing CN at concentrations of 5x and 10x the minimum bactericidal/fungicidal concentration (MBC/MFC) were prepared by microdilution. After contamination of the samples surfaces with these microorganisms, the mouthwashes (CN - 5x and 10x; CHX - 0,12% alcohol-free chlorhexidine and LT - alcohol-free essential oils) were evaluated. Mouthwash simulation was performed for 1 min at two moments, the first simulation after 4 h of microbial adhesion and 24 h-biofilm formation, and the second simulation, 6 h after the first simulation. For biofilm quantification, the number of cultured cells was evaluated by CFUs. The cytotoxicity assay was performed on HaCat epithelial cells and quantified by the MTT method. RESULTS: Tested solutions completely inhibited the growth of both microorganisms in the adhesion phase. All solutions showed inhibitory activity against 24 h-biofilm formation. However, CN led to greater microbial reduction, regardless of the surface of the sample. All solutions demonstrated a toxic effect. However, after serial dilution, CN presented the lowest cytotoxic effect. CONCLUSION: Citronella had a lower cytotoxic effect and a higher action compared to commercial solutions.


Assuntos
Biofilmes/efeitos dos fármacos , Cymbopogon/química , Prótese Dentária/microbiologia , Antissépticos Bucais/farmacologia , Óleos Vegetais/farmacologia , Anti-Infecciosos/farmacologia , Candida albicans/efeitos dos fármacos , Linhagem Celular , Humanos , Testes de Sensibilidade Microbiana , Staphylococcus aureus/efeitos dos fármacos
5.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 54(11): 773-777, 2019 Nov 09.
Artigo em Chinês | MEDLINE | ID: mdl-31683386

RESUMO

Characterized by eminent mechanical properties, chemical stability and biosafety, polyetheretherketone (PEEK), as a brand-new type of biomedical material, has been applied in the field of stomatology. This review elaborates on basic behaviors and fabrication methods of PEEK and its composite, and their application in fixed dental prostheses (FDP) as frameworks as well as their adhesive properties. Meanwhile, this review also looks into the prospect of the integration of additive manufacturing in fabricating frameworks of PEEK and its composite in FDP.


Assuntos
Prótese Dentária , Cetonas , Materiais Biocompatíveis , Materiais Dentários , Polietilenoglicóis
6.
J Korean Med Sci ; 34(41): e280, 2019 10 28.
Artigo em Inglês | MEDLINE | ID: mdl-31650722
7.
BMC Oral Health ; 19(1): 219, 2019 10 11.
Artigo em Inglês | MEDLINE | ID: mdl-31604449

RESUMO

BACKGROUND: The small-colony variants (SCVs) of Staphylococcus aureus were isolated from persistent and recurrent infections, especially after placement of medical devices having direct contact with human tissues. The emergence of SCVs is a survival strategy of S. aureus which enables them to hide inside host's cells and induces a less severe immune response than to wild-type S. aureus. However, contrary to other medical devices, dental prosthesis as a surface potentially colonized by SCVs of S. aureus has not been examined thus far. We reported the first case of SCVs - S. aureus infection in denture wearer. CASE PRESENTATION: A 62-year-old woman with a complete removable acrylic denture presented extensive elevated erythematous lesions on the palate, compatible with denture stomatitis. The patient had a history of arterial hypertension, cigarette smoking and wearing denture at night. The fungal colonies, identified as Candida albicans, were cultured on Sabouraud agar. From three swabs (from hard palate mucosa, denture surface and angular cheilitis lesions) were cultured of pinpoint, clear, non-pigmented, and non-haemolytic colonies on Columbia agar. The small colonies turned out to be Gram-positive cocci, catalase-, Pastorex Staph Plus -, and clumping factor-positive, and oxidase-negative. Suspected phenotypically SCVs forms were definitively identified as S. aureus based on PCR amplification of species specific nuc and coa genes. Methicillin-resistance was verified by mecA gene detection. The isolates turned out to be susceptible to methicillin (MSSA) and resistant to gentamicin. The isolate was identified as menadione-auxotrophic variant. CONCLUSIONS: This case demonstrated that oral cavity in denture wearers may be a reservoir of small-colony variants of S. aureus, besides C. albicans. The prevalence of these bacteria and their role in the pathogenesis of oral diseases are not understood. Due to problems with their detection and identification, the true prevalence of oral SCVs may be underestimated.


Assuntos
Prótese Dentária/microbiologia , Infecções Estafilocócicas/diagnóstico , Staphylococcus aureus/isolamento & purificação , Estomatite sob Prótese/microbiologia , Antibacterianos/uso terapêutico , Prótese Dentária/efeitos adversos , Feminino , Humanos , Pessoa de Meia-Idade , Infecções Estafilocócicas/tratamento farmacológico , Estomatite sob Prótese/diagnóstico , Estomatite sob Prótese/tratamento farmacológico , Resultado do Tratamento
8.
Braz Dent J ; 30(5): 519-522, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31596337

RESUMO

The study aimed to identify the changes in the provision of dental prosthetics procedures in the Brazilian primary care. Secondary data from the Brazilian "National Programme for Improving Access and Quality of Primary Care" was assessed and three similar questions related to dental prostheses execution that were answered by the same 9,698 oral health teams, in 2011/2012 and 2013/2014, were compared. There was a 4.3% increase in the number of teams that identified individuals with prosthetic needs; a 0.8% increase in the number of teams that performed impression for prosthetic purposes; and the number of teams that reported performing dental prostheses consultations increased by 0.6%. Overall, there was a small modification in the number of teams that provided dental prosthesis procedures in Brazil.


Assuntos
Assistência Odontológica , Prótese Dentária , Brasil , Humanos , Saúde Bucal , Atenção Primária à Saúde
9.
Int J Mol Sci ; 20(19)2019 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-31546661

RESUMO

The widespread use of nanoparticles (NPs) in medical devices has opened a new scenario in the treatment and prevention of many diseases and infections owing to unique physico-chemical properties of NPs. In this way, silver nanoparticles (AgNPs) are known to have a strong antimicrobial activity, even at low concentrations, due to their ability to selectively destroy cellular membranes. In particular, in the field of dental medicine, the use of AgNPs in different kinds of dental prosthesis matrixes could be a fundamental tool in immunodepressed patients that suffer of different oral infections. Candida albicans (C. albicans), an opportunistic pathogenic yeast with high colonization ability, is one of the causative agents of oral cavity infection. In our work, we added monodispersed citrate-capping AgNPs with a size of 20 nm at two concentrations (3 wt% and 3.5 wt%) in poly(methyl methacrylate) (PMMA), the common resin used to develop dental prostheses. After AgNPs characterization, we evaluated the topographical modification of PMMA and PMMA with the addition of AgNPs by means of atomic force microscopy (AFM), showing the reduction of surface roughness. The C. albicans colonization on PMMA surfaces was assessed by the Miles and Misra technique as well as by scanning electron microscopy (SEM) at 24 h and 48 h with encouraging results on the reduction of yeast viability after AgNPs exposure.


Assuntos
Antifúngicos/farmacologia , Prótese Dentária/microbiologia , Nanopartículas Metálicas/química , Polimetil Metacrilato/química , Prata/farmacologia , Antifúngicos/química , Candida albicans/efeitos dos fármacos , Candida albicans/ultraestrutura , Humanos , Nanopartículas Metálicas/ultraestrutura , Microscopia de Força Atômica , Microscopia Eletrônica de Varredura , Prata/química
10.
Dent Mater ; 35(11): 1576-1593, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31522759

RESUMO

OBJECTIVES: Yttria Partially Stabilised Zirconia (YPSZ) is a high strength ceramic which has become widely used in porcelain veneered dental copings due to its exceptional toughness. Within these components the residual stress and crystallographic phase of YPSZ close to the interface are highly influential in the primary failure mode; near interface porcelain chipping. In order to improve present understanding of this behaviour, characterisation of these parameters is needed at an improved spatial resolution. METHODS: In this study transmission micro-focus X-ray Diffraction, Raman spectroscopy, and focused ion beam milling residual stress analysis techniques have, for the first time, been used to quantify and cross-validate the microscale spatial variation of phase and residual stress of YPSZ in a prosthesis cross-section. RESULTS: The results of all techniques were found to be comparable and complementary. Monoclinic YPSZ was observed within the first 10µm of the YPSZ-porcelain interface with a maximum volume fraction of 60%. Tensile stresses were observed within the first 150 µm of the interface with a maximum value of ≈300 MPa at 50 µm from the interface. The remainder of the coping was in mild compression at ≈-30MPa, with shear stresses of a similar magnitude also being induced by the YPSZ phase transformation. SIGNIFICANCE: The analysis indicates that the interaction between phase transformation, residual stress and porcelain creep at YPSZ-porcelain interface results in a localised porcelain fracture toughness reduction. This explains the increased propensity of failure at this location, and can be used as a basis for improving prosthesis design.


Assuntos
Porcelana Dentária , Prótese Dentária , Análise do Estresse Dentário , Facetas Dentárias , Teste de Materiais , Estresse Mecânico , Propriedades de Superfície , Ítrio , Zircônio
11.
Prosthes. Esthet. Sci ; 8(31): 39-42, abr./mai./jun. 2019.
Artigo em Português | BBO - Odontologia | ID: biblio-1016131

RESUMO

A cópia em negativo através de moldagem e obtenção de molde é um procedimento corriqueiro e obrigatório para que se obtenha um modelo que registre os detalhes de dentes e tecidos circunvizinhos para a construção de próteses dentárias. A moldagem da maxila envolve, por convenção, o uso de moldeira superior. O procedimento de moldagem abrangendo todo o arco superior, incluindo palato, é uma manobra extremamente desconfortável ao paciente, uma vez que o material para registro pode escoar em direção a orofaringe. Quando o objeto de moldagem não exige registro de palato, pode-se utilizar uma moldeira inferior modificada para maior conforto do paciente, sem prejuízo ao molde a ser obtido. Sugere-se, nesta oportunidade, modificação simples da moldeira inferior para registro da arcada superior, com economia de material e conforto ao paciente.(AU).


Negative copyng through molding and obtaining the molding is a common and mandatory procedure to get a model that registers the details of surrounding teeth and tissues for the construction of dental prostheses. The maxillary molding involves, by convention, the use of upper tray. The molding procedure covering the entire upper arch, including the palate, is na extremely uncomfortable maneuver to the patient, as the material for registrationmay flow into the oropharynx. When the molding object does not require palate registration, a modified lower tray be used for greater patient comfort without prejudice of the mold to be obtained. It is suggested, in the ocasion, simple modification of lower tray for upper arc registration, saving material and giving comfort to the patient.


Assuntos
Humanos , Masculino , Feminino , Prótese Dentária , Técnica de Moldagem Odontológica , Materiais para Moldagem Odontológica , Materiais Dentários
12.
Comput Math Methods Med ; 2019: 7416076, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31379973

RESUMO

In some cases of proclined maxillary incisors, the proclination can be corrected by a fixed prosthesis. The aim of this study was to investigate the magnitude and distribution of (i) principal stresses in the adjacent alveolar bone and (ii) direct and shear stresses that are normal and parallel, respectively, to the bone-tooth interface of a normal angulated maxillary incisor, a proclined one, and a proclined one corrected with an angled prosthetic crown. 2D finite-element models were constructed, and a static load of 200 N on the palatal surface of the maxillary incisor at different load angles was applied. Load angles (complementary angle to interincisal angle) ranging from 20° to 90° were applied. The results indicate that the load angle could have a more significant impact on the overall stress distributions in the surrounding alveolar bone and along the bone-tooth interface than the proclination of the maxillary incisor. Provided that the resulting interincisal angle is 150° or smaller, the stresses in the surrounding bone and at the bone-tooth interface are similar between a proclined maxillary incisor and the one with prosthodontic correction. Hence, such a correction, when deemed appropriate clinically, can be undertaken with confidence that there is little risk of incurring additional stresses over that already in existence, in the supporting bone and at the tooth-bone interface.


Assuntos
Planejamento de Prótese Dentária , Prótese Dentária/instrumentação , Incisivo/anatomia & histologia , Maxila/anatomia & histologia , Algoritmos , Fenômenos Biomecânicos , Cefalometria , Simulação por Computador , Elasticidade , Análise de Elementos Finitos , Humanos , Incisivo/cirurgia , Modelos Lineares , Teste de Materiais , Maxila/cirurgia , Pressão , Software , Estresse Mecânico , Resistência à Tração
13.
Codas ; 31(3): e20180080, 2019 Jul 15.
Artigo em Português, Inglês | MEDLINE | ID: mdl-31314861

RESUMO

PURPOSE: To evaluate the self-perception of the food conditions of elderly users of dental prosthesis, in order to verify the interference that dental prosthesis has in their feeding. METHODS: The present study counted with 60 elderly, participants of the Centro de Convivência Nair Ventorin Gurgacz (Community Center), aged between 60 and 88 years old. All participants answered to a questionnaire elaborated by the researchers and the Geriatric Oral Health Assessment Index (GOHAI). RESULTS: The elderly who participated in this study, mostly women, used a bimaxillary removable prosthesis for over 30 years; although they classified their nutrition as "good" and did not present preference for specific food consistency, they frequently felt pain while chewing. The average score of the GOHAI was 29.73, considered "low", the index dimension with worst score was physical function, that includes eating, speaking and swallowing. No relation was observed between time of use of dental prosthesis, age and the GOHAI scores. CONCLUSION: The elderly rarely complaint about discomfort or embarrassment on feeding, however, they present an average lower than expected in the GOHAI index, which indicates that, although they do not report it, many deteriorations, that seem to be natural may be happening and may be the cause of worst quality of life.


Assuntos
Prótese Dentária/psicologia , Ingestão de Alimentos/psicologia , Autoimagem , Idoso , Idoso de 80 Anos ou mais , Brasil , Estudos Transversais , Deglutição/fisiologia , Prótese Dentária/efeitos adversos , Prótese Dentária/estatística & dados numéricos , Ingestão de Alimentos/fisiologia , Feminino , Alimentos , Avaliação Geriátrica , Humanos , Masculino , Mastigação/fisiologia , Pessoa de Meia-Idade , Saúde Bucal , Qualidade de Vida , Inquéritos e Questionários
14.
Pan Afr Med J ; 33: 5, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31303950

RESUMO

Acromegaly is a rare disease that can have serious consequences. This disease is not widely known by stomatologists, although cranio-facial manifestations are important and rapid changes in the oral cavity are frequent and sometimes dramatic. The prosthetic management of patients with acromegaly is not easy because it is necessary to wait for the stabilization of the disease. If this is not the case, the bone changes prevent the stability of prostheses over time. Moreover, because of bone remodeling, some treatments are contra-indicated, which limits our therapeutic choices. Through this clinical case, we will focus on the oral manifestations of patients with acromegaly and the method of prosthetic management.


Assuntos
Acromegalia/complicações , Prótese Dentária , Reabilitação Bucal/métodos , Humanos , Masculino , Pessoa de Meia-Idade
15.
J Oral Rehabil ; 46(12): 1095-1099, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31216063

RESUMO

BACKGROUND: Improvement of masticatory function is critical in prosthetic treatment. Multiple factors are related to patients' perception of chewing ability in denture wearers. However, the associations between such factors and chewing ability have not yet been fully elucidated. OBJECTIVE: To investigate the association between mucosal pain and subjective masticatory function in patients with partial removable dental prostheses (PRDPs). METHODS: This cross-sectional study included 333 consecutive patients with PRDPs (mean age 71.2 years, male 33.3%) who were recruited from the prosthetic clinic of a dental hospital in Japan. Patients' perception of chewing ability was evaluated using a food intake questionnaire consisting of 20 items, and chewing difficulty was rated by patients using an 11-point numerical scale. Participants rated the pain intensity of the denture-supporting mucosa and oral dryness while chewing. In addition, the bilateral maximal biting force (MBF) was recorded. A structural equation model was used to identify the factors associated with chewing ability and chewing difficulty. RESULTS: The model indicated that mucosal pain, oral dryness, the number of occluding pairs, the denture type (interim/definitive PRDPs) and the MBF were significant independent predictors of chewing ability and chewing difficulty (P < 0.01). CONCLUSIONS: Our findings suggest that mucosal pain is a risk factor for impairment of subjective masticatory function in patients with PRDPs. It is clinically important to consider the denture design and to select denture base materials with regard to the prevention of mucosal pain.


Assuntos
Prótese Dentária , Prótese Parcial Removível , Idoso , Estudos Transversais , Humanos , Japão , Masculino , Mastigação , Membrana Mucosa , Dor
16.
Rev Epidemiol Sante Publique ; 67(4): 223-231, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31204147

RESUMO

BACKGROUND: The aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France. METHODS: The data were obtained from the 2002-2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics. RESULTS: The prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR=0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR=0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR=1.29; 95% CI: [1.17; 1.43]) than those without chronic disease. CONCLUSION: This study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.


Assuntos
Assistência Odontológica/estatística & dados numéricos , Implantação Dentária/estatística & dados numéricos , Prótese Dentária/estatística & dados numéricos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Estudos Transversais , Assistência Odontológica/instrumentação , Assistência Odontológica/métodos , Cárie Dentária/epidemiologia , Cárie Dentária/terapia , Feminino , França/epidemiologia , Humanos , Masculino , Pessoa de Meia-Idade , Saúde Bucal/estatística & dados numéricos , Doenças Periodontais/epidemiologia , Doenças Periodontais/terapia , Prevalência , Fatores de Risco , Fatores Socioeconômicos , Inquéritos e Questionários , Adulto Jovem
17.
J Prosthodont Res ; 63(3): 266-270, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31147298

RESUMO

PURPOSE: Titanium and titanium alloys are one of the main metallic materials in the medical and dental fields because of their biocompatibility. In this review, the application of titanium and its alloys as the substitute materials for Ag-Pd-Au alloy in the casting of fixed dental prostheses was examined. STUDY SELECTION: A reference search was performed through PubMed based on the keywords titanium, titanium alloy, and dental casting. Other relevant references were obtained from the citation in the articles. RESULTS: The dental casting technology for titanium has already been developed for clinical use, which enables the use of appropriate casting machines and investment materials for titanium and its alloys available commercially. The mechanical properties, castability, and corrosion resistance of titanium and titanium alloys were reported to be comparable or superior to the conventional dental alloys. Clinical researches reported that titanium and Ti-6Al-7Nb alloy casings showed suitable quality for clinical application. CONCLUSION: Titanium and its alloys can be the substitute materials for Ag-Pd-Au alloy, and should be considered worthy of qualifying for the dental insurance coverage.


Assuntos
Prótese Dentária , Titânio , Ligas , Ligas Dentárias , Teste de Materiais , Propriedades de Superfície
18.
Journal of Oral Investigations ; 8(1): 69-85, jan.-jun. 2019. ilus, tab, graf
Artigo em Português | BBO - Odontologia | ID: biblio-994732

RESUMO

Objetivo: O objetivo deste trabalho foi avaliar visualmente a possível influência de um substrato escurecido no resultado estético de coroas com infraestruturas de dissilicato de lítio ou zircônia. Metodologia: O delineamento foi observacional, transversal e descritivo. Para o experimento, foi selecionado um paciente com necessidade de coroas totais no 11 e 21, onde um dos dois elementos deveria ser escurecido. Uma coroa de dissilicato de lítio foi confeccionada sobre o substrato sem alteração de cor. Para o elemento escurecido foram confeccionadas uma coroa de dissilicato de lítio e uma de zircônia, criando-se duas situações clínicas. Sem conhecimento de qual material foi usado, os avaliadores responderam a um questionário que comparava o resultado estético das coroas de dissilicato de lítio ou zircônia com a coroa de dissilicato de lítio sobre o substrato normal, assim como as duas situações clínicas entre si. No total, 20 cirurgiões-dentistas participaram como avaliadores. Os avaliadores julgaram as restaurações como excelentes, aceitáveis ou inaceitáveis e, após, foi realizada uma análise descritiva das avaliações. Resultados: Os resultados demonstraram que houve diferença estética entre as restaurações de dissilicato de lítio e de zircônia, sendo que o dissilicato de lítio não conseguiu bloquear a cor do substrato, mesmo sendo utilizada uma pastilha opaca (MO). Conclusão: Concluiu-se que em casos de substrato escurecido está indicada a utilização de uma infraestrutura com opacidade suficiente, como a zircônia, podendo ocorrer diferenças visualmente perceptíveis e inaceitáveis caso seja utilizado um material translúcido como o dissilicato de lítio(AU)


Purpose: The objective of this work was to evaluate visually the possible influence of a darkened substrate on the aesthetic result of crowns with infiltrations of lithium disilicate or zirconia. Methodology: The design was observational, transversal and descriptive. For the experiment, a patient with total crowns at 11 and 21 was selected, where one of the two elements should be darkened. A crown of lithium disilicate was made on the substrate without color change. For the darkened element, a crown of lithium disilicate and one of zirconia were created, creating two clinical situations. Without knowing which material was used, the evaluators answered a questionnaire that compared the aesthetic result of the lithium disilicate or zirconia crowns with the lithium disilicate crown on the normal substrate, as well as the two clinical situations. A total of 20 dental surgeons participated as evaluators. The evaluators judged the restorations to be excellent, acceptable or unacceptable, and afterwards a descriptive analysis of the evaluations was performed. Results: The results showed that there was aesthetic difference between the restorations of lithium disilicate and zirconia, and the lithium disilicate could not block the color of the substrate, even though an opaque ingot (MO) was used. Conclusion: It was concluded that in cases of darkened substrate, an infrastructure with sufficient opacity, such as zirconia, with visually perceptible and unacceptable differences, if a translucent material such as lithium disilicate is used(AU)


Assuntos
Pigmentação , Prótese Dentária , Coroas , Zircônio , Cerâmica , Porcelana Dentária , Estética Dentária , Lítio
19.
J Med Life ; 12(1): 43-48, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31123524

RESUMO

This study aimed to assess the masticatory efficiency in patients with a removable dental prosthesis, presenting different systemic, oral and prosthetic states while chewing different foods. The study was conducted on a convenient sample of patients aged 45 and above, with removable prostheses in at least one jaw. Patients were asked to chew samples of digestive biscuits, apple, and carrot, until the sensation of swallowing. The recorded masticatory function parameters were: chewing time, the number of mastication cycles, mean masticatory cycle duration, and chewing frequency. We found out that the masticatory functional parameters registered statistically significant differences according to the chewed food (e.g., generally the highest values were recorded for carrot and lowest for apple), most likely this being in relation to food's consistency, wetting, and adherence. High positive correlations were found between the chewing time and the number of mastication cycles for all three foods taken into consideration. Higher values for chewing time and number of mastication cycles were found for all foods in patients with complete dentures and overdentures, and while chewing carrot in patients with altered general status and of advanced age. Therefore, it that it takes a different time and number of mastication cycles to complete chewing, in relation to individual and food characteristics, to the systemic, oral and prosthetic patient's status. The residual teeth number and the type of prosthetic rehabilitation favor the adaptation and improvement of masticatory parameters and can have marker value for masticatory efficiency.


Assuntos
Prótese Dentária , Prótese Total , Mastigação/fisiologia , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Deglutição/fisiologia , Feminino , Alimentos , Humanos , Masculino , Pessoa de Meia-Idade , Fatores de Tempo
20.
Health Qual Life Outcomes ; 17(1): 79, 2019 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-31053080

RESUMO

BACKGROUND: Oral health-related quality of life (OHRQoL) has important implications for the clinical practice of dentistry and dental research and should contribute to professional judgment about restorative treatments and prosthetic replacement in patients who had reduced dentitions. The aim was to compare the OHRQoL among adults (35-44 years) categorized according to different definitions of reduced dentition and considering the use (or non-use) of dental prosthesis. METHODS: This study used data from a probabilistic sample of adults in Sao Paulo, Brazil, 2015. OHRQoL was based on none items of Oral Impacts on Daily Performance (OIDP) index, as prevalence (at least one impact) and extent (the number of items with non-zero score). We used different criteria to assess dentition status: (1) Shortened Dental Arch (SDA): having 3-5 natural occlusal units (OUs) in posterior teeth and intact anterior region; (2) hierarchical functional classification system: a five-level stepwise classification of dentition; and (3) presence of ≥21 teeth. The use or nonuse of dental prosthesis was recorded. Negative binomial regression models involved the adjustment for social determinants of health. RESULTS: Nearly half (53.1%) of the 5753 participating adults had at least one oral health issue impacting OHRQoL. OIDP prevalence in adults with SDA did not differ from those with more OUs (PR = 1.02; 95%CI 0.91-1.13). Individuals with non-functional dentition had worse OHRQoL regardless of their use of a dental prosthesis. Adults with fewer than 21 remaining teeth, ranked significantly higher in OIDP extent, regardless of dental prosthesis use (PR = 1.38; 95%CI 1.16-1.63 with prosthesis; PR = 1.62; 95%CI 1.19-2.20 without dental prosthesis). CONCLUSIONS: Individuals with more missing teeth reported worse OHRQoL regardless of using a dental prosthesis. Preserving a functional dentition, even with missing teeth, is compatible with OHRQoL.


Assuntos
Dentição Permanente , Saúde Bucal , Qualidade de Vida/psicologia , Adulto , Brasil/epidemiologia , Estudos Transversais , Prótese Dentária/psicologia , Feminino , Humanos , Masculino , Perda de Dente/epidemiologia
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