ABSTRACT
A estética tem um papel importante na aceitação e autoestima das pessoas e, em virtude disso, os pacientes buscam cada dia mais ter um sorriso harmonioso. As reabilitações estéticas devem envolver um planejamento completo, atrelando função e estética, avaliando tamanho dos dentes, perfil e alturas gengivais, altura do sorriso e corredor bucal. Por conta disso, a odontologia nos permite uma série de abordagens terapêuticas diferentes que chegam a resultados satisfatórios para o paciente. Sendo assim, o presente trabalho tem como objetivo descrever um relato de caso de uma paciente com queixa estética do seu sorriso devido à diferentes tonalidades, formas e tamanhos dos dentes. Após anamnese, exame clínico e radiográfico, o plano de tratamento proposto foi de harmonizações periodontal com aumento de coroa e enxerto gengival, além de coroas em cerâmicas de dissilicato de lítio. Dentro desse contexto, mostra-se que uma abordagem multidisciplinar para reabilitação estética e funcional do sorriso é fundamental, a qual nos proporciona equilíbrio e naturalidade entre estética branca e vermelha no resultado do tratamento reabilitador(AU)
Aesthetics plays an important role in people's acceptance and self-esteem and, as a result, patients increasingly seek to have a harmonious smile. Aesthetic rehabilitations must involve a complete planning, linking function and aesthetics, evaluating tooth size, gingival profile and heights, smile height and buccal corridor. Because of this, dentistry allows us a series of different therapeutic approaches that reach satisfactory results for the patient. Therefore, the present work aims to describe a case report of a patient with an aesthetic complaint of her smile due to different shades, shapes and sizes of teeth. After anamnesis, clinical and radiographic examination, the proposed treatment plan was periodontal harmonization with crown augmentation and gingival graft, in addition to lithium disilicate ceramic crowns. Within this context, it is shown that a multidisciplinary approach to the aesthetic and functional rehabilitation of the smile is fundamental, which provides us with balance and naturalness between white and red aesthetics in the result of the rehabilitation treatment(AU)
Subject(s)
Humans , Female , Middle Aged , Ceramics , Crowns , Esthetics, Dental , Gingiva/transplantation , Crown Lengthening , Dental Veneers , Gingivoplasty , LithiumABSTRACT
Introdução: A procura pela estética do sorriso é crescente na Odontologia, pois, muitas vezes um sorriso alinhado e periodonto saudável não são o bastante. A cerâmica odontológica apresenta-se como uma ótima possibilidade restauradora, visto o avanço das técnicas de adesão entre o substrato dentário e as cerâmicas, torna-se mais previsível o resultado com este tipo de reabilitação. Objetivo: O presente artigo tem como objetivo descrever um caso clínico com envolvimento de diversos níveis de desgaste dentário para reabilitação estética com cerâmica de dissilicato de lítio. Relato de caso: Paciente 36 anos, gênero feminino, apresentava insatisfação com seu sorriso devido a forma e a alteração de cor dos seus dentes superiores anteriores e pré-molares. O plano de tratamento consistiu em realizar a troca da coroa metalocerâmica por coroa total cerâmica da unidade 14, coroa total cerâmica nas unidades 11, 21 e 22, facetas cerâmicas nas unidades 15, 13, 12, 23, 24 e 25, osteotomia e gengivoplastia das regiões de 2º prémolar superior esquerdo ao 2º pré-molar superior direito, clareamento dental caseiro da arcada inferior e placa oclusal superior de proteção. O material de escolha para a resolução do caso clínico foi a cerâmica vítrea reforçada à base de dissilicato de lítio, pois, possui um índice de refração de luz semelhante à estrutura dentária, sem interferência significativa da translucidez, além de ser passível de cimentação adesiva por se tratar de uma cerâmica ácido sensível e o tamanho do cristal e a sua disposição favorecem o aumento das propriedades mecânicas da restauração. Conclusão: O plano de tratamento realizado permitiu o restabelecimento da função e estética, com reprodução das características dos dentes naturais e promoção da jovialidade e da harmonia no sorriso(AU)
Introduction:The demand for smile aesthetics is growing in Dentistry, because, often a smile aligned and healthy periodontium are not enough. Dental ceramics, presented as an excellent restorative possibility, since the advancement of adhesion techniques between the dental substrate and the ceramics, becomes more predictable the result with this type of rehabilitation. Objective: This article aims to describe a clinical case involving several levels of dental wear for aesthetic rehabilitation with ceramics. Case Report: A 36-year-old female patient presented dissatisfaction with her smile due to the shape and color alteration of her anterior and premolar upper teeth. The treatment plan consisted of exchanging the metal-ceramic crown for the total ceramic crown of unit 14, total ceramic crown in units 11, 21 and 22, ceramic veneers in units 15, 13, 12, 23, 24 and 25, osteotomy and gingivoplasty of the regions from 2nd left upper premolar to 2nd right upper premolar, home tooth whitening of the lower arch and upper occlusal plate of protection. The material of choice for the resolution of the clinical case was the glass ceramic reinforced on the basis of lithium disilicate because it has a refractive index of light similar to the dental structure, without significant interference of translucency, besides being liable to adhesive cementation because it is a sensitive acid ceramic and the size of the crystal and its disposition favor the increase of the mechanical properties of the restoration. Conclusion: The treatment plan performed allowed the restoration of function and aesthetics, with reproduction of the characteristics of natural teeth and promotion of joviality and harmony in the smile(AU)
Subject(s)
Humans , Female , Adult , Ceramics , Crowns , Dental Veneers , Esthetics, Dental , Lithium , Osteotomy , Tooth Bleaching , Periodontium , Occlusal Splints , Tooth Wear , GingivoplastyABSTRACT
A descoloração ou perda de translucidez dos materiais cerâmicos usados em odontologia ainda hoje é um problema, especialmente pelo comprometimento estético. Com o objetivo de comparar a estabilidade de cor, blocos de dissilicato de lítio (IPS e.max CAD HT) e de silicato de lítio reforçado com zircônia (Vita Suprinity HT) fresados no desenho de um disco com dimensões de 1,5 × 7 × 12 mm3 (n = 120) foram preparados usando 3 procedimentos de acabamento de superfície: glaze, polimento mecânico e coloração externa e glaze. Em seguida, cada grupo foi dividido em 2 subgrupos de armazenamento, chá preto e café (n = 10/grupo). As mensurações de cor foram medidas com espectrofotômetro (VITA Easyshade) no estágio inicial e após 1 semana, 2 semanas, 1 mês, 2 meses de armazenamento. As alterações de cor (ΔE) foram calculadas e analisadas estatisticamente usando ANOVA (α < 0,05). Observamos que, para ambos os materiais cerâmicos, o procedimento de glaze apresentou valores de mudança de cor estatisticamente menores do que os outros grupos (p < 0,05) após o armazenamento em ambas as bebidas. Os grupos de dissilicato de lítio apresentaram valores de alteração de cor estatisticamente menores em relação aos grupos de silicato de lítio reforçados com zircônia. Conclui-se que, o glaze sozinho levou a uma maior estabilidade de cor em relação ao polimento mecânico e coloração externa o dissilicato de lítio apresentou maior estabilidade de cor em comparação com o silicato de lítio reforçada com zircônia.
The discoloration or loss of translucency of ceramic materials used in dentistry is still a problem today, especially due to aesthetic compromise. In order to compare color stability, lithium disilicate (IPS e.max CAD HT) and zirconia-reinforced lithium silicate (Vita Suprinity HT) blocks were milled into a disc design with dimensions of 1.5 × 7 × 12 mm3 (n = 120). The specimens were prepared using 3 surface finishing procedures: glaze, mechanical polishing and external staining and glaze. Then, each group was divided into 2 storage subgroups, black tea and coffee (n = 10/group). Color measurements were measured with a spectrophotometer (VITA Easyshade) at the initial stage and after 1 week, 2 weeks, 1 month, 2 months of storage. Color changes (ΔE) were calculated and statistically analyzed using ANOVA (α < 0.05). We observed that, for both ceramic materials, the glaze procedure presented statistically lower color change values ââthan the other groups (p < 0.05) after storage in both beverages. The lithium disilicate groups showed statistically lower color change values ââthan the zirconia-reinforced lithium silicate groups. It is concluded that, glaze alone led to greater color stability compared to mechanical polishing and external staining, lithium disilicate showed greater color stability compared to zirconia-reinforced lithium silicate.
Subject(s)
Beverages , Ceramics , Computer-Aided Design , Color , Dental Polishing/methods , Lithium , SilicatesABSTRACT
Objective: The present study aims to evaluate the color stability and degree of conversion of amine-free dual cured resin cement compared to light cured and amine-containing dual cured resin cements used with two different translucencies of thin esthetic restorations. Material and Methods: A total of 120 specimens were prepared for color stability testing (n=60). The specimens were divided into three main groups according to the resin cement type. Group 1: amine-free dual cured, Group 2: light cured, Group 3: amine-containing dual cured. Each group was further subdivided according to the ceramic translucency into two subgroups: high and low translucency. Color stability was assessed by a spectrophotometer before and after thermal aging. For the degree of conversion assessment (n=60), Fourier transform infrared spectroscopy was used at three different time intervals. Statistical analysis was performed using multi-factorial ANOVA, followed by one-way ANOVA with Bonferroni correction. Results: Amine-containing resin cement showed significantly higher ΔEab and ΔE00in both translucencies (4.5±0.3, 3.5±0.3 respectively for high translucency ceramic and 3.8±0.4, 3.0±0.3 respectively for low translucency) than the other tested cements (p<0.001). The highest degree of conversion (DC) was shown after 2 weeks by the amine-free dual cured resin cement (86.27±0.74). Conclusion: Amine-free dual cured resin cement can be an alternative to light cured one for cementation of thin veneers since it showed comparable color stability and high degree of conversion (AU)
Objetivo: O presente estudo tem como objetivo avaliar a estabilidade de cor e o grau de conversão do cimento resinoso dual sem amina em comparação com cimentos resinosos fotopolimerizáveis contendo amina usados com duas translucidezes diferentes em restaurações estéticas definitivas. Material e Métodos: Um total de 120 espécimes foram preparados para teste de estabilidade de cor (n=60). Os espécimes foram divididos em três grupos principais de acordo com o tipo de cimento resinoso. Grupo 1: polimerização dupla sem amina, Grupo 2: fotopolimerização, Grupo 3: polimerização dupla contendo amina. Cada grupo foi ainda subdividido de acordo com a translucidez da cerâmica em dois subgrupos: alta e baixa translucidez. A estabilidade da cor foi avaliada por um espectrofotômetro antes e após o envelhecimento térmico. Para a avaliação do grau de conversão (n=60), a espectroscopia de infravermelho com transformada de Fourier foi usada em três intervalos de tempo diferentes. A análise estatística foi realizada usando ANOVA multifatorial, seguida de ANOVA um faot com correção de Bonferroni. Resultados: O cimento resinoso contendo amina apresentou ΔEab e ΔE00 significativamente maiores em ambas as translucidezes (4,5±0,3, 3,5±0,3 respectivamente para cerâmica de alta translucidez e 3,8±0,4, 3,0±0,3 respectivamente para baixa translucidez) do que os outros cimentos testados (p< 0,001). O maior grau de conversão (DC) foi mostrado após 2 semanas pelo cimento resinoso dual sem amina (86,27±0,74). Conclusão: O cimento resinoso dual sem amina pode ser uma alternativa ao cimento polimerizável na restauração de facetas finas, uma vez que apresentou estabilidade de cor comparável e alto grau de conversão. (AU).
Subject(s)
Color , Resin Cements , Polymerization , LithiumABSTRACT
ABSTRACT. Rapidly progressive dementia (RPD) is a rare neurological disorder. Drug toxicity is among the differential diagnoses, including the use of lithium, in which an overdosage might cause cognitive dysfunction. Clinical suspicion, laboratory confirmation, and drug interruption are key points in the management of lithium intoxication. We described a 66-year-old female patient under treatment with lithium who developed an RPD associated with parkinsonian symptoms. 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) showed an "Alzheimer-like" pattern, while cerebrospinal fluid biomarkers for the disease were negative. There was a significant clinical and radiological improvement after lithium interruption. Lithium intoxication is a potentially reversible cause of RPD, as demonstrated in this case report. Drug discontinuation should be considered even in patients with normal levels of this metal, if cognitive impairment is detected. 18F-FDG PET/CT images may show an "Alzheimer-like" image pattern in acute intoxication and are useful for monitoring these patients.
RESUMO. Demência rapidamente progressiva é uma condição rara, cujos diagnósticos diferenciais incluem intoxicação por drogas como lítio, podendo causar importante disfunção cognitiva. A suspeita clínica, a confirmação laboratorial e a interrupção do uso medicamentoso são elementos fundamentais em seu diagnóstico e manejo. Trata-se de paciente feminina, de 66 anos de idade, que apresentou quadro demencial após intoxicação por lítio. Tal quadro foi acompanhado de sintomas parkinsonianos, além de Tomografia por Emissão de Pósitrons com 18F-Fluodeoxiglicose (18F-FDG PET/CT) compatível com padrão "Alzheimer-like". Houve melhora objetiva de parâmetros clínicos e imaginológicos após a interrupção do uso medicamentoso. A intoxicação por lítio é uma causa potencialmente reversível de demência rapidamente progressiva. A descontinuação da droga deve ser considerada também em pacientes com níveis normais do metal no sangue se alterações cognitivas forem encontradas. Imagens 18F-FDG PET/CT podem demonstrar achados sugestivos de doença de Alzheimer na intoxicação aguda e parecem ser um método útil no seguimento.
Subject(s)
Humans , Female , Aged , Poisoning , Dementia , LithiumABSTRACT
@#Thyroid storm and thionamide-induced agranulocytosis are both rare and serious medical emergencies. We report a case of a patient in which these two rare events simultaneously occurred. A 33-year-old male, maintained on Methimazole for Graves’ Disease, presented with fever, throat pain, and uncontrolled thyrotoxic symptoms. Methimazole was promptly discontinued. Thyroid storm was alternatively treated with lithium, hydrocortisone, and propranolol. Agranulocytosis was managed supportively with GCSF and empiric antibiotics. Lithium was maintained until after radioablation. When thionamides are contraindicated, lithium is a viable option for the acute management of thyroid storm and a bridge to definitive therapy.
Subject(s)
Methimazole , LithiumABSTRACT
This paper introduces the distribution of global lithium resources and absorption, distribution, metabolism and excretion of lithium in the human body, discussing the positive effect of lithium in the environment on the nervous system and its neuroprotective mechanism. The tiny amounts of lithium that enter the body through the food chain have been linked to beneficial health effects, such as improved cognition and reduced depression and violence. However, the safe dose range of lithium is narrow, and the health effects of drinking high concentrations of lithium water in high-lithium areas are unclear. It is necessary to study the health effects and mechanisms of different doses of lithium, especially high concentrations of lithium in the environment.
Subject(s)
Humans , Central Nervous System , Lithium , ViolenceABSTRACT
Resumen Introducción: La manía unipolar (MU) es un trastorno que se comporta de manera distinta al trastorno bipolar-I (TB-I), sin embargo, no es considerado como una entidad independiente por los manuales diagnósticos vigentes, sino que es incluido dentro del diagnóstico de TB-I. Caso clínico: Hombre de 21 años presenta cuadro clínico de 3 meses de evolución caracterizado por ánimo exaltado y síntomas psicóticos congruentes al estado de ánimo. El paciente niega episodios depresivos previos. Se instaura tratamiento con litio y aripiprazol que resulta satisfactorio, sin presentar recurrencias tras 5 años de seguimiento. Revisión de la literatura y discusión: Los manuales diagnósticos describen que para diagnosticar TB-I no se requiere la presencia de un episodio depresivo mayor, lo que implica que pacientes con MU quedan dentro de la misma categoría diagnóstica que pacientes con TB-I. Diferencias entre MU y TB-I han sido demostradas en estudios epidemiológicos, clínicos y genéticos, por lo tanto, incluir pacientes heterogéneos dentro de la misma categoría podría dificultar la interpretación de estudios y limitar los avances en el conocimiento de ambos trastornos. Conclusión: De la revisión de la literatura se sugiere que la MU debe ser reconocida como un diagnóstico independiente. A pesar de su baja prevalencia, al validarlo como tal, en un futuro podríamos contar con mayor cantidad y mejor calidad de datos sobre este. De esta forma se podrá definir de manera más concreta sus características distintivas, y por consiguiente mejorar el abordaje clínico de estos pacientes.
Introduction: Unipolar mania (UM) is a disorder that behaves differently from bipolar-I disorder (BP-I), however, it is not considered an independent entity by current diagnostic manuals, but rather included within the diagnosis of BP-I. Case report: A 21-year-old man presented a 3-month-long episode characterized by exalted mood and mood-congruent psychotic symptoms. The patient denies previous depressive episodes. Treatment with lithium and aripiprazole was established, which was satisfactory, not showing recurrence after 5 years of follow-up. Literature review and discussion: Diagnostic manuals describe that to diagnose BP-I the presence of a major depressive episode is not required, which implies that patients with UM fall into the same diagnostic category as patients with BP-I. Differences between UM and BP-I have been demonstrated in epidemiological, clinical, and genetic studies, therefore, including heterogeneous patients within the same category could hinder the interpretation of studies and limit advances in the knowledge of both disorders. Conclusion: Based on the literature review, it is suggested that UM should be recognized as an independent diagnosis. Despite its low prevalence, by validating it as such, in the future we could have more and better-quality data about this diagnosis. In this way, its distinctive characteristics can be defined more concretely, and therefore improve the clinical approach of these patients.
Subject(s)
Humans , Male , Adult , Bipolar Disorder/diagnosis , Bipolar Disorder/classification , Bipolar Disorder/drug therapy , Aripiprazole/therapeutic use , Lithium/therapeutic useABSTRACT
SUMMARY INTRODUCTION: Nephrogenic diabetes insipidus (DI) is a polyuric and polydipsic syndrome and can have multiple causing factors. CASE DESCRIPTION: A 69-year-old woman with bipolar disorder medicated with lithium 400mg for 12 years on a daily basis. The patient was admitted, after psychiatric decompensation, with hypernatremia unresponsive to hypotonic iv fluids. The diagnosis of DI was made with high plasmatic osmolality measurement, low urine osmolality, and high levels of antidiuretic hormone. Full clinical recovery was possible with lithium suspension, hydration, and chlorthalidone. DISCUSSION: Although frequently used in the past, Lithium (Li) is nowadays rarely used in clinical practice for prolonged treatments because of its potentially devastating side effects. Clinicians must be aware of those side effects in order to prevent organ damage, mainly in patients with severe bipolar disease and precarious response to alternative treatments.
RESUMO INTRODUÇÃO: O diabetes insípido nefrogênico faz parte das síndromes poliúricas polidipsicas e pode ter múltiplos fatores causais. CASO CLÍNICO: Mulher de 69 anos, com doença bipolar medicada com lítio 400 mg por dia durante 12 anos. A doente foi internada, após descompensação da doença bipolar, por hipernatremia não responsiva a fluidoterapia hipotônica endovenosa. O diagnóstico de DI foi realizado com base na elevação da osmolaridade plasmática, baixa osmolaridade urinária e níveis elevados de hormona antidiurética. Verificou-se recuperação clínica completa com suspensão do lítio, hidratação e clorotalidona. DISCUSSÃO: Apesar do seu uso frequente no passado, o lítio (Li) é hoje em dia raramente utilizado na prática clínica por períodos prolongados pelos seus efeitos potencialmente devastadores. Os médicos devem ter em conta os potenciais efeitos secundários de forma a prevenir lesão de órgão em doentes com doença bipolar de difícil controle com outra terapêutica.
Subject(s)
Humans , Female , Aged , Diabetes Insipidus, Nephrogenic , Diabetes Insipidus, Nephrogenic/chemically induced , Bipolar Disorder/drug therapy , Friends , Lithium/therapeutic useABSTRACT
O Informe Diário de Evidências é uma produção do Ministério da Saúde que tem como objetivo acompanhar diariamente as publicações científicas sobre tratamento farmacológico e vacinas para a COVID-19. Dessa forma, são realizadas buscas estruturadas em bases de dados biomédicas, referentes ao dia anterior desse informe. Não são incluídos estudos pré-clínicos (in vitro, in vivo, in silico). A frequência dos estudos é demonstrada de acordo com a sua classificação metodológica (revisões sistemáticas, ensaios clínicos randomizados, coortes, entre outros). Para cada estudo é apresentado um resumo com avaliação da qualidade metodológica. Essa avaliação tem por finalidade identificar o grau de certeza/confiança ou o risco de viés de cada estudo. Para tal, são utilizadas ferramentas já validadas e consagradas na literatura científica, na área de saúde baseada em evidências. Cabe ressaltar que o documento tem caráter informativo e não representa uma recomendação oficial do Ministério da Saúde sobre a temática. Foram encontrados 20 artigos e 16 protocolos.
Subject(s)
Humans , Pneumonia, Viral/drug therapy , Coronavirus Infections/drug therapy , Betacoronavirus/drug effects , Steroids/toxicity , Technology Assessment, Biomedical , Vitamin D/therapeutic use , Ivermectin/therapeutic use , Immunoglobulins/therapeutic use , Angiotensin-Converting Enzyme Inhibitors/therapeutic use , Vaccines/therapeutic use , Chloroquine/therapeutic use , Fingolimod Hydrochloride/therapeutic use , Rituximab/therapeutic use , Infliximab/therapeutic use , Hydroxychloroquine/therapeutic use , Lithium/therapeutic useABSTRACT
The aim of this study was to evaluate the effect of different commercial silanes on microshear bond strength of resin cement to lithium disilicate ceramic. Twenty ceramic samples with 10 mm in length, 10 mm wide and 3 mm in thickness were fabricated, etched with 10% hydrofluoric acid for 20 seconds, and divided into 5 groups, according to the commercial silane applied: G1- RelyX Ceramic Primer (3M ESPE), G2- Angelus Silane, G3- Prosil (FGM), G4- Dentsply Silane (Dentsply) and G5- Bis-Silane (Bisco). Silanes were applied in accordance to manufacturers' recommendations. Addition silicone molds with 1 mm in thickness, 10 mm in diameter and 3 perforations with 1 mm in diameter each one, were placed on ceramic and filled with the resin cement RelyX ARC (3M ESPE) in all groups. Light activation was performed with LED Bluephase G2 (Ivoclar Vivadent) at 1200 mW/cm2, for 30 seconds. Samples were maintained in 100% humidity at 37°C for 24 hours and submitted to microshear test. The data (MPa) were submitted to one-way ANOVA and Tukey test (α=0.05). The results obtained for each group were: G1: 22.39±2.99; G2: 23.35±4.08; G3: 26.05±5.46; G4: 18.56±4.09; G5: 25.26±4.10. Statistical analysis showed significantly lower microshear bond strength for G4. Fracture pattern analysis showed predominance of adhesive failures in G1 and G2. G3 and G5 presented higher percentage of cohesive failures in ceramic, and G4 showed mixed, adhesive and cohesive fractures with similar percentages. It was concluded that different silanes showed influence on the lithium disilicate ceramic resin cement bond strength
O objetivo neste estudo foi avaliar o efeito de diferentes silanos comerciais na resistência de união ao microcisalhamento do cimento resinoso à cerâmica de dissilicato de lítio. Foram confeccionadas 20 amostras de cerâmica (10mm de comprimento, 10mm de largura e 3mm de espessura), condicionadas com ácido fluorídrico a 10% por 20 segundos e divididas em 5 grupos, de acordo com o silano aplicado: G1- RelyX Ceramic Primer (3M ESPE), G2- Silano Angelus, G3-Prosil (FGM), G4- Silano Dentsply e G5-Bis-Silane (Bisco). Matrizes de silicone por adição (1 mm de espessura, 10 mm de diâmetro e 3 perfurações com 1 mm de diâmetro) foram colocadas sobre a cerâmica e preenchidas com cimento resinoso RelyX ARC (3M ESPE). A fotoativação foi realizada com LED Bluephase G2 (Ivoclar Vivadent) a 1200 mW/cm2, por 30 segundos. As amostras foram mantidas em 100% de umidade a 37°C por 24 horas e submetidas ao teste de microcisalhamento. Os dados (MPa) (G1: 22,39+2,99; G2: 23,35+4,08; G3: 26,05+5,46; G4: 18,56+ 4,09; G5: 25,26+4,10) foram submetidos a análise de variância e ao teste de Tukey (p<0,05). A análise estatística mostrou valor de resistência de união significantemente menor para G4. A análise do padrão de fratura mostrou predominância de falha adesiva para G1 e G2. G3 e G5 apresentaram maior porcentagem de falha coesiva em cerâmica, e o G4 apresentou fraturas mista, adesiva e coesiva em igual porcentagem. Concluiu-se que os diferentes silanos apresentaram influência na resistência de união do cimento resinoso à cerâmica de dissilicato de lítio
Subject(s)
Silanes , Ceramics , Dental Cements , Shear Strength , Lithium , Silicate Cement , Cementation , Resin Cements , Dental PorcelainABSTRACT
PURPOSE: To investigate the influence of crown material (lithium-disilicate, 3Y-TZP zirconia) and abutment type (rigid implant, resin tooth with artificial periodontium) on wear performance of their antagonist teeth and adjacent teeth.MATERIALS AND METHODS: A mandibular left first molar (#36) with adjacent human teeth (mandibular left second premolar: #35, mandibular left second molar: #37) and antagonistic human teeth (maxillary left second premolar: #25, maxillary left first molar: #26, maxillary left second molar: #27) was prepared simulating a section of the jaw. Samples were made with extracted human molars (Reference), crowned implants (Implant), or crowned resin tooth analogues (Tooth). Crowns (tooth #36; n = 16/material) were milled from lithium-disilicate (Li, IPS e.max CAD) or 3Y-TZP zirconia (Zr, IPS e.max ZirCAD, both Ivoclar Vivadent). Thermal cycling and mechanical loading (TCML) in the chewing simulator were applied simulating 15 years of clinical service. Wear traces were analyzed (frequency [n], depth [µm]) and evaluated using scanning electron pictures. Wear results were compared by one-way-ANOVA and post-hoc-Bonferroni (α = 0.05).RESULTS: After TCML, no visible wear traces were found on Zr. Li showed more wear traces (n = 30–31) than the reference (n = 21). Antagonistic teeth #26 showed more wear traces in contact to both ceramics (n = 27–29) than to the reference (n = 21). Strong wear traces (> 350 µm) on antagonists and their adjacent teeth were found only in crowned groups. Abutment type influenced number and depth of wear facets on the antagonistic and adjacent teeth.CONCLUSION: The clinically relevant model with human antagonistic and adjacent teeth allowed for a limited comparison of the wear situation. The total number of wear traces and strong wear on crowns, antagonistic and adjacent teeth were influenced by crown material.
Subject(s)
Humans , Bicuspid , Ceramics , Crowns , Jaw , Lithium , Mastication , Molar , ToothABSTRACT
BACKGROUND@#Most studies have reported that suicide mortality rates are negatively associated with lithium levels in tap water; however, a few studies showed either no association or a positive association. Thus, the association between suicide mortality and lithium levels in tap water remains controversial. To clarify the association, our study evaluated the association between lithium levels in tap water and suicide mortality rates in Miyazaki Prefecture of Japan, after adjusting for confounding factors.@*METHODS@#We measured lithium levels in tap water across the 26 municipalities of Miyazaki Prefecture in Japan. We examined the standardized mortality ratio (SMR) for suicide in each municipality and used the data as the average suicide SMRs over 5 years (2009-2013). Weighted least-squares regression analysis, adjusted for the size of each municipality's population, was used to investigate the association between lithium levels in tap water and suicide SMRs. In addition to a crude model, in an adjusted model, potential confounding factors (proportion of elderly people, proportion of one-person households, annual marriage rate, annual mean income, unemployment rate, the density of medical doctors per 100,000 people, annual total rainfall, and proportion of people with a college education or higher) were added as covariates.@*RESULTS@#We showed that male and female suicide SMRs were not associated with lithium levels in tap water in Miyazaki Prefecture. After adjusting for confounders, male suicide SMRs were significantly and positively associated with the proportion of elderly people in the population and annual total rainfall, and female suicide SMRs were associated with the proportion of elderly people in the population.@*CONCLUSIONS@#No association between lithium levels in tap water and suicide mortality rates was found in Miyazaki Prefecture.
Subject(s)
Female , Humans , Male , Drinking Water , Japan , Lithium , SuicideABSTRACT
Esta nota apresenta a validação de um método para realizar a determinação de lítio em concentrações menores do que 40 μg L-1 em amostras de águas de abastecimento público, utilizandose cromatografia de íons e calibração externa, com a curva analítica obtida por regressão linear (mínimos quadrados ordinários). O método é seletivo, e apresenta limite de detecção igual a 1,0 μg L-1 e limite de quantificação igual a 2,0 μg L-1 . Os ensaios de recuperação em três níveis de concentração apresentaram resultados entre 99,4 e 101,9%. Na avaliação da precisão nos mesmos três níveis de concentração, os coeficientes de variação exibiram valores entre 1,1 e 4,0%.
This note presents the validation of a method for determining the lithium at concentrations less than 40 μg L-1 in the public water supply, by using the ion chromatography and external calibration, and the analytical curve was obtained by the linear regression (ordinary least squares). The employed method is selective, showing the detection limit equal to 1.0 μg L-1 and the quantification limit equal to 2.0 μg L-1 . Recovery tests in three concentration levels presented results from 99.4 to 101.9%. On the precision evaluation in the same three concentration levels, the coefficients of variation exhibited values between 1.1 and 4.0%.
Subject(s)
Water Supply , Chemical Phenomena , Lithium/analysis , Water Microbiology , Chromatography, Ion ExchangeABSTRACT
Esta nota apresenta a validação de um método para realizar a determinação de lítio em concentrações menores do que 40 µg L1 em amostras de águas de abastecimento público, utilizandose cromatografia de íons e calibração externa, com a curva analítica obtida por regressão linear (mínimos quadrados ordinários). O método é seletivo, e apresenta limite de detecção igual a 1,0 µg L1e limite de quantificação igual a 2,0 µg L1.Os ensaios de recuperação em três níveis de concentração apresentaram resultados entre 99,4 e 101,9%. Na avaliação da precisão nos mesmos três níveis de concentração, os coeficientes de variação exibiram valores entre 1,1 e 4,0%. (AU)
This note presents the validation of a method for determining the lithium at concentrations less than 40 µg L1 in the public water supply, by using the ion chromatography and external calibration, and the analytical curve was obtained by the linear regression (ordinary least squares). The employed method is selective, showing the detection limit equal to 1.0 µg L1 and the quantification limit equal to 2.0 µg L1. Recovery tests in three concentration levels presented results from 99.4 to 101.9%. On the precision evaluation in the same three concentration levels, the coefficients of variation exhibited values between 1.1 and 4.0%. (AU)
Subject(s)
Water Supply , Chromatography , Ions , LithiumABSTRACT
Objective: To evaluate whether an animal model of mania induced by lisdexamfetamine dimesylate (LDX) has an inflammatory profile and whether immune activation by lipopolysaccharides (LPS) has a cumulative effect on subsequent stimuli in this model. We also evaluated the action of lithium (Li) on inflammatory and neurotrophic factors. Methods: Adult male Wistar rats were subjected to an animal model of mania. After the open-field test, they were given LPS to induce systemic immune activation. Subsequently, the animals' blood was collected, and their serum levels of brain-derived neurotrophic factor and inflammatory markers (tumor necrosis factor [TNF]-α, interleukin [IL]-6, IL-1β, IL-10, and inducible nitric oxide synthase [iNOS]) were measured. Results: LDX induced hyperactivity in the animals, but no inflammatory marker levels increased except brain-derived neurotrophic factor (BDNF). Li had no effect on serum BDNF levels but prevented iNOS levels from increasing in animals subjected to immune activation. Conclusion: Although Li prevented an LPS-induced increase in serum iNOS levels, its potential anti-inflammatory effects in this animal model of mania were conflicting.
Subject(s)
Animals , Male , Bipolar Disorder/immunology , Disease Models, Animal , Lisdexamfetamine Dimesylate , Lithium/pharmacology , Anti-Inflammatory Agents/pharmacology , Nerve Growth Factors/drug effects , Time Factors , Bipolar Disorder/physiopathology , Bipolar Disorder/chemically induced , Enzyme-Linked Immunosorbent Assay , Lipopolysaccharides/pharmacology , Reproducibility of Results , Cytokines/blood , Treatment Outcome , Rats, Wistar , Brain-Derived Neurotrophic Factor/blood , Nitric Oxide Synthase Type II/blood , Locomotion/drug effectsABSTRACT
RESUMEN La prescripción de carbonato de litio es común en la actividad psiquiátrica cotidiana. El objetivo es identificar las alteraciones endocrinas secundarias y sus bases fisiopatológicas. La revisión de la literatura se realizó en Psycinfo, EMBASE, PubMed y Scopus. Se efectuó una búsqueda computarizada de información utilizando la estrategia PICO. Las alteraciones más comunes están en riñones, tiroides, paratiroides, páncreas y vías neuroendocrinas. Los mecanismos fisiopatológicos subyacentes son diversos, y destacan la inhibición de la adenilato ciclasa tiroidea sensible a tirotropina como causa de hipotiroidismo, la expresión reducida de acuaporina 2 como causa de diabetes insípida nefrogénica, la pérdida del equilibrio iónico del calcio y la presencia de hiperparatiroidismo e hipercalcemia. En el eje hipotálamo-hipófiso-adrenal, se documenta una disminución en la producción de catecolaminas. Finalmente, se documenta la desregulación en el control de la glucemia al aumentar la resistencia a la insulina. Es necesario conocer estas eventualidades e identificarlas tempranamente a través de evaluaciones periódicas. Se propone un esquema de evaluación integral, sin que implique un algoritmo de tratamiento.
ABSTRACT The prescribing of Lithium is common in psychiatric clinical practice. The aim of this study was to identify the most common endocrine side effects associated with this drug and to clarify the pathophysiological basis. A systematic review was conducted in Psycinfo, Embase, PubMed, and Scopus. A computerised search for information was performed using a PICO (patient, intervention, comparative, outcomes) strategy. The main neuroendocrine alterations were reported in kidneys, thyroid and parathyroid glands, pancreas, and the communication pathways between the pituitary and adrenal glands. The pathophysiological mechanisms are diverse, and include the inhibition of the thyroid adenylate cyclase sensitive to the thyroid stimulant hormone (TSH) sensitive adenylate cyclase, which causes hypothyroidism. It also reduces the expression of aquaporin type 2, which is associated with nephrogenic diabetes insipidus, and the loss of the ionic balance of calcium that induces hyperparathyroidism and hypercalcaemia. Other considerations are related to alterations in the hypothalamic-pituitary-adrenal axis and a decrease in the production of catecholamines. Finally, another side-effect is the glycaemic dysregulation caused by the insulin resistance. Periodical clinical and para-clinical evaluations are necessary. The author proposes an evaluation scheme.
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Lithium Carbonate , Kidney , Lithium , Parathyroid Glands , Thyroid Gland , Adrenal Glands , Diabetes Insipidus, NephrogenicABSTRACT
Objetivo: O objetivo deste estudo foi verificar a capacidade do sistema de polimento para reduzir a rugosidade superficial de cerâmicas IPS e.max após acabamento com brocas diamantadas. Métodos: Dez corpos de prova foram confeccionados a partir de blocos de cerâmica de dissilicato de lítio, cristalizados e glazeados (Grupo G1) antes de serem submetidos a leitura com rugosímetro portátil em três pontos diferentes. Foi simulado ajuste oclusal com brocas diamantadas cilíndricas de granulação fina (Grupo G2) e feita uma nova leitura antes de realizar a sequência de polimento com o Kit EVE Diapol H8 (Grupo G3), constituído de três discos de borrachas abrasivas de granulações decrescentes. Após análise da rugosidade superficial do último grupo, as médias das três medições foram submetidas à análise estatística ANOVA e ao teste Tukey com o nível de significância 5%. Resultados:A análise dos dados obtidos revelou diferença estatisticamente significativa entre os três grupos, sendo que no Grupo G2 a rugosidade foi maior que no Grupo G1, que por sua vez foi maior que no Grupo G3. Conclusão: Concluiu-se que o sistema de polimento EVE Diapol H8 reduziu efetivamente a rugosidade superficial após acabamento com brocas diamantadas e proporcionou uma lisura superficial superior àquela dada pelo glaze. (AU)
Aim: This study sought to verify the ability of the polishing system to reduce the surface roughness of IPS E.max ceramics after finishing with diamond drills. Methods:Ten specimens were made from lithium disilicate ceramic blocks, crystallized, and glazed (Group G1) before being subjected to reading with a portable rugosimeter at three different points. Occlusal adjustment was simulated with fine-grained cylindrical diamond burs (Group G2) and re-read before performing the polishing sequence with the EVE Diapol H8 Kit (Group G3), consisting of three rubber diamond discs with decreasing granulations. After analyzing the surface roughness of the last group, the means of the three measurements were submitted to ANOVA statistical analysis and to the Tukey test with a significance level of 5%. Results: The analysis of the data revealed a statistically significant difference between the three groups, with the roughness in the G2 Group being greater than that in the G1 Group, which in turn was greater than that in the G3 Group. Conclusion: It was therefore concluded that the EVE Diapol H8 polishing system effectively reduced surface roughness after finishing with diamond drills and provided a surface smoothness that is superior to that given by the glaze. (AU)