Resistencia estructural de prótesis dentales acrílicas y de cromo cobalto en cadáveres quemados o carbonizados: a propósito de dos casos / Structural resistance of acrylic and cobalt-chromium dental prostheses in burned or charred corpses: a propos of two cases

La identificación humana genera continuos desafíos técnicos y científicos para los equipos de expertos forenses en sus múltiples contextos de intervención. Uno de los más complejos, está representado por el hallazgo de cadáveres quemados o carbonizados, donde las huellas dactilares resultan inviables. En tales situaciones, los tejidos de la cavidad oral han demostrado elevada tolerancia a la injuria térmica, aportando información decisiva, muchas veces com-plementada por estructuras protésicas recupera-das del occiso. El presente artículo reporta dos ca-sos donde las prótesis dentales acrílicas y de cromo cobalto exhibieron notable indemnidad pese a la gran pérdida orgánica sufrida por los cuerpos de las víc-timas ante la acción vulnerante del fuego, otorgando valor probatorio para contribuir en el establecimien-to de su identidad (AU)

Human identification generates continuous technical and scientific challenges for teams of forensic experts in their multiple contexts of intervention. One of the most complex is represented by the discovery of burned or charred corpses, where fingerprints are unviable. In such situations, the tissues of the oral cavity have shown high tolerance to thermal injury, providing decisive information, often complemented by prosthetic structures recovered from the deceased. This article reports two cases where the acrylic and cobalt chrome dental prostheses presented notable indemnity despite the great organic loss suffered by the bodies of the victims before the damaging action of fire, granting probative value to contribute to the establishment of their identity (AU)

Replacement of maxillary lateral incisors with digitally manufactured single tooth retained all-ceramic pontics: a clinical report / Reabilitação da região de incisivo lateral superior ausente por pôntico modelo cantiléver em cerâmica pura fabricado digitalmente: relato de caso clínico

Several treatment options for replacement of anterior missing teeth exist, varying from no-prep (no preparation) adhesive restorations to implants. Patients' biological, psychological, economic conditions or age have an effect on the treatment choice. It is important to perform the most conservative and beneficial treatment option considering the patient based factors. The aim of this case report was to demonstrate a single session, minimally invasive, cantilevered 2-unit all-ceramic restorations replacing anterior missing teeth combined with the advantages of CAD/CAM technology and materials. (AU)

Existem várias opções de tratamento para reabilitação de dentes anteriores ausentes, variando de restaurações adesivas sem preparo (sem preparação) até implantes. As condições biológicas, psicológicas, econômicas ou a idade dos pacientes têm um efeito na escolha do tratamento. É importante realizar a opção de tratamento mais conservadora e benéfica, considerando os fatores baseados no paciente. O objetivo deste relato de caso foi demonstrar em sessão única, minimamente invasiva, um cantiléver de restaurações de cerâmica pura de 2 unidades, reabilitando a região de dentes anteriores ausentes combinadas com as vantagens da tecnologia CAD/CAM.(AU)

Endocorona, un enfoque diferente en rehabilitación oral

RESUMEN Introducción: Con el avance de la tecnología adhesiva, nuevas técnicas y materiales restauradores están siendo utilizados para el tratamiento de dientes endodonciados, por ello, las endocoronas son una alternativa clínica para su tratamiento. La ventaja de esta restauración es que tiene mejores características macro retentivas, requiere menor tiempo clínico y de laboratorio. Objetivo: Proporcionar información bibliográfica actual sobre esta nueva alternativa para aplicar una nueva guía en rehabilitación oral con el uso de la endocorona mediante una revisión de la literatura. Método: Se realizó una revisión bibliográfica detallada, con la consideración de artículos originales o casos clínicos que incluían información relacionada a las restauraciones de tipo endocorona. La búsqueda se efectuó en las bases de datos PubMed, SciELO, Science Direct, Elsevier y Google Académico. Resultados: Las restauraciones de tipo endocorona son un monobloque único que devuelve la anatomía completa de la corona dental, la cual aprovecha la cámara pulpar para así lograr una mayor adhesión y macro retención mecánica. Este enfoque restaurador proporciona una función adecuada y estética, así como la integridad biomecánica de las estructuras no vitales. Conclusiones: Actualmente en la Odontología moderna se emplea el término de mínima intervención, conservando en su mayor cantidad posible el tejido dental de manera que los dientes tengan mayor funcionalidad, por ello las endocoronas son una opción segura y con buen pronóstico a largo plazo en rehabilitación oral para tratar piezas endodonciadas, debido a que es un procedimiento técnicamente más conservador, estético, sencillo y de menor costo.

ABSTRACT Introduction: With the advancement of adhesive technology, new techniques and restorative materials are being used for the treatment of root canals; therefore endocrowns are a clinical alternative for their treatment. The advantage of this restoration is that it has better macro retentive characteristics, requires less clinical and laboratory time. Objective: To provide current bibliographic information on this new alternative to apply a new guide in oral rehabilitation with the use of endocrown through a literature review. Method: A detailed bibliographic review was carried out, with the consideration of original articles or clinical cases that included information related to endocrown-type restorations. The search was carried out in the databases PubMed, SciELO, Science Direct, Elsevier and Google Scholar. Results: Endocrown restorations are a single monoblock that rebuilds the complete anatomy of the dental crown, which takes advantage of the pulp chamber to achieve greater adhesion and macro mechanical retention. This restorative approach provides adequate function and aesthetics, as well as the biomechanical integrity of non-vital structures. Conclusions: The term minimal intervention is currently very used in modern dentistry, preserving the dental tissue as much as possible so that the teeth have greater functionality. Endocrowns are a safe option with a good long-term prognosis in oral rehabilitation to treat root canals, because it is a technically more conservative, aesthetic, simple and lower-cost procedure.

RESUMO Introdução: Com o avanço da tecnologia adesiva, novas técnicas e materiais restauradores estão sendo utilizados para o tratamento de dentes endodônticos, portanto os endocrowns são uma alternativa clínica para seu tratamento. A vantagem dessa restauração é que ela apresenta melhores características macro retentivas, requer menos tempo clínico e laboratorial. Objetivo: Fornecer informações bibliográficas atuais sobre esta nova alternativa de aplicação de um novo guia na reabilitação oral com o uso de endocrown por meio de uma revisão da literatura. Método: Foi realizada uma revisão bibliográfica detalhada, considerando artigos originais ou casos clínicos que incluíam informações relacionadas a restaurações do tipo endocrown. A busca foi realizada nas bases de dados PubMed, SciELO, Science Direct, Elsevier e Google Scholar. Resultados: As restaurações do tipo endocrown são um único monobloco que devolve a anatomia completa da coroa dentária, que aproveita a câmara pulpar para obter maior adesão e retenção macromecânica. Esta abordagem restauradora fornece função e estética adequadas, bem como a integridade biomecânica de estruturas não vitais. Conclusões: Atualmente na odontologia moderna é utilizado o termo de intervenção mínima, preservando-se o tecido dentário o máximo possível para que os dentes tenham maior funcionalidade, portanto endocrowns são uma opção segura e com bom prognóstico em longo prazo na reabilitação oral para tratamento da endodontia dentes, por ser um procedimento tecnicamente mais conservador, estético, simples e de menor custo.

Higiene de las prótesis removibles en pacientes atendidos en la Universidad San Gregorio de Portoviejo, Ecuador 2019 / Hygiene for removable dental prostheses in patients assisted at San Gregorio de Portoviejo University, Ecuador 2019

RESUMEN Introducción: la prótesis dental removible es un tratamiento rehabilitador que devuelve las funciones al sistema estomatognático; para su éxito se necesita responsabilidad y compromiso entre el profesional y el paciente sobre la higiene y modo de uso. Objetivo: determinar el estado higiénico de la prótesis removible acrílica en los pacientes atendidos en las clínicas odontológicas de la Universidad San Gregorio de Portoviejo en el periodo marzo-agosto de 2019. Método: se realizó un estudio descriptivo transversal utilizando un cuestionario y una ficha de observación validados. Todos los sujetos de la investigación firmaron el consentimiento informado antes de responder el cuestionario y ser examinados. Se aplicó la estadística descriptiva, frecuencia y porcentaje. Resultados: fueron evaluados 100 paciente, con predominio del sexo femenino (74 %), y la edad de 50 años o más (54 %). Los resultados muestran que el 53 % de los pacientes usan prótesis confeccionadas por cinco o más años, y que el 94 % no ha asistido a controles subsiguientes. El método mecánico (86 %) es el más utilizado para higienizar las prótesis, y en el 65 % de las prótesis se observó acumulación de placa bacteriana y restos de alimento. La mayoría de los pacientes (78 %) usa la prótesis dental durante todo el día (24 horas) y, cerca de la mitad, tiene signos clínicos de estomatitis subprotésica (46 %). Conclusiones: la mayoría de los pacientes no cumplen con las normas de higiene y uso de las prótesis removibles por lo cual se necesita un cambio en su educación y seguimiento.

ABSTRACT Introduction: the removable dental prostheses is a rehabilitation treatment that returns the functions to the stomatognathic system; for its successful action it is necessary responsibility and commitment between the professional and the patient on hygiene and mode of use. Objective: to determine the hygienic condition of the removable acrylic prostheses in patients attended in the dental clinics at San Gregorio de Portoviejo University in the period March - August 2019. Method: A cross-sectional descriptive study was conducted using a validated questionnaire and observation worksheet. All participants in the research provided handwritten signature informed consent form before answering the questionnaire and being examined. Descriptive statistics, frequency and percentage were applied. Results: a total of 100 patients were evaluated, with higher prevalence in females (74%), and 50 years of age or more (54%). The results show that 53% of the patients use prostheses made for five or more years, and 94% have not attended subsequent checks. The mechanical method (86%) is the most used to sanitize the prostheses, and in 65% of the prostheses was observed accumulation of bacterial plaque and food debris. Most patients (78%) wear their prostheses throughout the day (24 hours) and about half have clinical signs of subprosthetic stomatitis (46%). Conclusions: Most patients do not comply with the rules of hygiene and use of removable prostheses so a change is needed in their education and monitoring.

Characteristics of Mandibular Movement and Mastication in Older Adults with Removable Dental Prostheses: Three-Dimensional Analysis / Características de Movimientos Mandibulares y Masticación en Adultos Mayores con Prótesis Dental Removible: un Análisis Tridimensional

ABSTRACT: Aging is a dynamic process that includes various alterations in the oral cavity, with tooth loss being the most frequent. Rehabilitative treatment may include removable or fixed prostheses and implants. The aim of this study was to describe the geometric (trajectory, ranges, areas) and kinematic (speed) characteristics of the mandibular and masticatory movements threedimensionally in participants with dental prostheses. A sample of 10 participants with removable prosthetic rehabilitation was divided into three groups (complete, atypical and overdenture) the characteristics of mandibular movements bordering and chewing with 3D Electromagnetic Articulography were measured. The Posselt polygonin was obtained, the frontal and sagittal plans, its areas, trajectories and ranges are analyzed. The masticatory movements were analyzed in the area of each cycle, the frequency, the speed and the reason between the masticatory cycle and the bordering movements, no significant differences between the groups. Subjects with dental prostheses, regardless of the type, they showed low of motion (border and functional) compared to dentate subjects with no functional alterations whose values have been reported in the literature. The subjects with overdenture have values closer to what is described for young dentate subjects.

RESUMEN: El envejecimiento es un proceso dinámico que incluye varias alteraciones en la cavidad oral, siendo la pérdida de dientes la más frecuente. El tratamiento de rehabilitación puede incluir prótesis fijas o removibles y/o implantes. El objetivo de este estudio fue describir las características geométricas (trayectoria, rangos, áreas) y cinemáticas (velocidad) de los movimientos mandibulares y masticatorios en participantes con prótesis dentales realizando un análisis en tres dimensiones. Se consideró una muestra de 10 participantes con rehabilitación protésica y se dividió en tres grupos (prótesis total, atípica e implantosoportada), se midieron las características de los movimientos mandibulares bordeantes y masticatorios con articulografía electromagnética 3D. Se obtuvo el polígono Posselt en los planos frontal y sagital, se analizaron sus áreas, trayectorias y rangos. Se analizaron los movimientos masticatorios en cuanto al área de cada ciclo, la frecuencia, la velocidad y la razón entre el área el ciclo masticatorio y los movimientos bordeantes, sin diferencias significativas entre los grupos. Los sujetos con prótesis dentales, independientemente del tipo, mostraron disminución de movimiento (bordeante y funcional) en comparación con los sujetos dentados sin alteraciones funcionales cuyos valores se han informado en la literatura. Los sujetos con prótesis implantosoportada tienen valores más cercanos a lo que se describe para sujetos jóvenes dentados.

Effect of glaze technology on adhesive and mechanical properties of Yttria-stabilized tetragonal zirconia polycrystal ceramic / 中国组织工程研究

BACKGROUND: Any surface treatments should Improve the bond strength of yttria-stabilized tetragonal zlrconia polycrystal ceramics without damaging the original strength. Currently, there is no Information about the influence of glaze technology on the bond strength of yttria-stabilized tetragonal zlrconia polycrystal ceramics, and its Influence on the material strength Is unclear. OBJECTIVE: To evaluate the effect of glaze technology on the mechanical behavior of yttria-stabilized tetragonal zlrconia polycrystal ceramics and on the bond strength with resin cements. METHODS: Yttria-stabilized tetragonal zlrconia polycrystal ceramics specimens were prepared and randomly divided into four groups: group A: the surface was not treated; group B: sandblasting with 110 urn Al203 particles; group C: glaze + hydrofluoric acid etching; group D: glaze + hydrofluoric acid etching + sllanlzation. The surface morphology, surface roughness, phase transformation, elemental composition, shear bond strength and flexural strength of zlrconia specimens after surface treatments were tested. RESULTS AND CONCLUSION: (1) The surface roughness of treatment groups increased obviously, whose descending order was group C (0.62±0.01) um > group D (0.55±0.02) um > group B (0.11±0.02) um > group A (0.05±0.01) urn (p 0.05). (6) The effect of glaze technology on improving the flexural strength of yttria-stabilized tetragonal zirconia polycrystal ceramics is not as obvious as that of sandblasting, but the bond strength between tetragonal zirconia polycrystal ceramics and resin cements can be significantly Improved with hydrofluoric acid etching and silanization after glaze.

Clinical observation of cement-retained and screw-retained implant-supported denture in edentulous patients / 口腔疾病防治

Objective@# To evaluate the clinical effects of full-arch cement-retained implant-supported combined crowns and screw-retained implant-supported bridge dentures in complete or half edentulous patients. @*Methods @#A total of 25 patients with complete or partial edentulous dentures followed up for 1, 3, and 5 years in our hospital from June 2013 to June 2018 and were treated with Straumann bone horizontal implantation, cobalt-chromium stenting and cobalt-chromium porcelain restoration with cement-retained and screw-retained implant-supported fixed dental prostheses to evaluate the accumulative implant survival rate, accumulative prosthesis survival rate, mechanical complications, and biological complications in both groups. @*Results @#There were 25 complete or half edentulous patients who received 165 Straumann implants and 28 implant-supported fixed dental prostheses in this study. There were 11 cases with 69 implants in the cement group and 17 cases with 96 implants in the screw group. The accumulative implant survival rate was 100% in the cement group and 96.9% in the screw group. The accumulative prosthesis survival rate was 100% in both groups. The cumulative peri-implant mucositis rate was 23.2% in the cement group and 29.2% in the screw group, and the peri-implantitis rate was 6.8% in the cement group and 7.3% in the screw group. There was 1 case of porcelain collapse (n=1/11) and no screw of abutment loosening in the cement group and 4 cases of porcelain collapse (n=4/17) and 1 case of screw loosening in the screw group. No fracture of abutment was observed in either group. There was no difference in bone loss between the two groups in the first year (P > 0.05), and a higher rate of bone loss was found in the screw group in the third and fifth years (P < 0.05). There was no difference in the sulcus bleeding index(mSBI) between the two groups in the first year and the third year (P > 0.05) and a higher modified mSBI value in the cement group in the fifth year (P < 0.05).@*Conclusion @#The survival rates of the implant and prosthesis for cement-retained or screw-retained implant-supported fixed dental prostheses were both high, but there were more mechanical and biological complications in the traditional cobalt-chromium alloy screw-retainer group. The removal of residual adhesives must be reasonably considered when choosing the cement retention method.

Implant- and tooth-supported removable partial dentures: a case report / Prótese parcial removível sobre implante e dentes: relato de caso clínico

ABSTRACT This study aimed to report treatment of a patient with Kennedy's class l maxillary and class II mandibular arch with removable partial dentures supported on an external hexagon (HE) anterior type implant of regular diameter fitted with an O'ring type of attachment. This clinical case reports the oral rehabilitation of a senile patient whose clinical examination revealed missing dentition in the upper and lower arches, attrition of the lower anterior teeth, caries, and motor impairment affecting hygiene, mastication, and esthetic functions. Due to few severely impaired teeth, the pre-prosthetic preparation included extractions and restorations, followed by the fabrication of upper and lower removable partial dentures supported by an HE-type implant. This study is important because it addresses the current challenges faced in the implementation of treatment involving removable partial dentures combined with implants, which is a topic that still needs long-term follow-up and research.

RESUMO Este trabalho tem por objetivo relatar o tratamento reabilitador com próteses removíveis classe l de Kennedy superior e classe ll de Kennedy inferior associada a um implante de diâmetro regular, do tipo hexágono externo (HE) superior anterior, com o sistema de encaixe do tipo O'ring. O presente trabalho, relata um caso clínico em reabilitação oral em um paciente senil no qual apresentava ao exame clínico ausências dentárias no arco superior e inferior, desgaste por atrição nos dentes anteriores inferiores, cáries e comprometimento motor, prejudicando a higienização, função mastigatória e estética. Em virtude do grau de comprometimento de alguns dentes, o preparo pré-protético foi realizado com exodontias, restaurações e, por fim, a confecção de próteses parciais removíveis inferior e superior conjugada com um implante do tipo HE. O presente estudo é importante porque aborda os desafios atuais da implantação da prótese parcial removível combinada com o implante, um tema que ainda necessita de pesquisas de acompanhamento a longo prazo.

Perfil do usuário e demanda protética do serviço de odontologia de uma Policlínica Militar / The profile of dental service users and demand for prosthetic care in a military polyclinic

Objetivou-se avaliar o perfil dos usuários e identificar os trabalhos protéticos realizados em um serviço odontológico de uma policlínica militar. Foram incluídos prontuários abertos durante os anos de 2014 a 2016 com indicação de tratamento no serviço de prótese dentaria. Foram coletados dados sócios-demográficos e informações referentes ao tipo de trabalho protético planejado, o status do tratamento, o número de consultas clínicas e informações relacionadas a satisfação do usuário frente ao tratamento realizado. Dados relativos ao Índice de Desenvolvimento Humano (IDH) das cidades cujos usuários residiam também foram analisados. A classificação de cada trabalho protético foi dada a partir da sua aplicabilidade. A amostra foi composta por 203 prontuários em que foram descritos 320 procedimentos protéticos. Destes prontuários avaliados, a maioria era de dependentes (34%), do sexo feminino (58,6%), casados (63,5%) com média de idade de 50 anos (±17,08). Em relação ao nível de escolaridade, a maior parte dos usuários (33,5%) tinha o 2º grau completo e era natural da região sudeste (80,8%). O município de Niterói, com IDH médio, era a residência de 47,3% da amostra (96 indivíduos). O principal motivo pela procura do atendimento protético foram as consultas de rotina (89,2%) e houve a conclusão dos trabalhos em 68,1% dos prontuários, predominando a prótese fixa seguida da prótese removível. Em relação a queixas durante o tratamento, em 71,9% dos prontuários não haviam relatos de pacientes insatisfeitos. O número médio de consultas para a realização dos procedimentos foi de 4 (±2,73), variando entre 1 e 15 consultas. Diante dos resultados deste estudo, pode-se concluir que a maioria dos usuários do serviço são dependentes, do sexo feminino, casados, com o 2º grau completo, com média de idade 50 anos, residentes na sua maioria em Niterói-RJ e em municípios com IDH médio e que receberam prótese fixa seguida pela prótese removível.

The aim of this study was to evaluate the profile of dental service users and to identify the prosthetic work performed at the Dentistry Division of the Military Polyclinic. Open charts were included during the years 2014 to 2016 with indication of treatment in the dental prosthesis service. Socio-demographic data and information regarding the type of planned prosthetic work, the status of the treatment, the number of clinical consultations and information related to the user's satisfaction with the treatment performed were collected. Data on the Human Development Index (HDI) of the cities whose users resided were also analyzed. The classification of each prosthetic work was given from its applicability. The sample consisted of 203 dental records in which 320 prosthetic procedures were described. Of these records, the majority were dependent (34%), female (58.6%), married (63.5%) and mean age 50 years (± 17.08). Regarding education level, the majority of users (33.5%) had a high school degree and were from the Southeast region (80.8%). The municipality of Niterói, with average HDI, was the residence of 47.3% of the sample (96 individuals). The main reason for the demand for prosthetic care was routine consultations (89.2%) and work was completed in 68.1% of the medical records, with fixed prosthesis predominating followed by removable prosthesis. Regarding complaints during treatment, there were no reports of dissatisfied patients in 71.9% of the records. The mean number of visits to the procedures was 4 (± 2.73), ranging from 1 to 15 visits. Considering the results of this study, it can be concluded that the majority of the users of the service are dependent, female, married, with a high school diploma, with a mean age of 50 years, residing mostly in Niterói-RJ and in municipalities with average HDI and who received fixed prosthesis followed by the removable prosthesis.

Software educativo sobre instrumental y materiales para prótesis estomatológica / Educational Software about dental prostheses materials and instruments

RESUMEN Introducción: la producción del software educativo facilita al alumno la asimilación de los conceptos, consultas de documentación auxiliar y realización de ejercicios. Objetivo: elaborar un software educativo del tema instrumental y materiales para prótesis estomatológica de la carrera de Estomatología. Método: se realizó una investigación de desarrollo tecnológico en el campo de recursos del aprendizaje en la Clínica Estomatológica "Artemio Mastrapa Rodríguez", en Holguín, Cuba, desde enero de 2016 a enero de 2017. La muestra fue de 28 estudiantes y 18 profesores. La selección fue intencionada y aleatoria simple. Se utilizaron métodos teóricos como: revisión bibliográfica-documental, inducción-deducción, análisis-síntesis y el cuestionario como método empírico. Resultados: se desarrollaron los contenidos de acuerdo con los objetivos esenciales y métodos de enseñanza y se conformaron los módulos del software. El 92,9% de los estudiantes y el 88,8% de los profesores calificaron el recurso de excelente. Conclusiones: se elaboró un software educativo que puede ser utilizado durante el desarrollo del proceso de enseñanza-aprendizaje y el estudio independiente. La mayoría de los profesores y estudiantes evaluaron el software educativo de excelente.

ABSTRACT Introduction: the educational softwares facilitate comprehension. Provide students a helpful tool for individual study and exercises solving. Objective: to create an educational software about dental prostheses materials and instruments for dentistry career. Method: research was carried out in the field of learning resources, at "Artemio Mastrapa" dental clinic in Holguin, from January 2016 to January 2017. Sample was 28 students and 18 teachers, all selected according to the purpose of the study. Theoretical methods were used, such as bibliographical and documental review, analysis and synthesis, induction and deduction and individual interviews as the empiric method. Results: creation of the software module with contents according to the signature objectives and the teaching methods. The 92.9% of students and 88.8% of teachers considered it excellent. Conclusions: the creation of an educational software for students and teachers. It was considered excellent by most of students and teachers interviewed.

Efectos de la prótesis dental en la función masticatoria de adultos mayores / Effects of dental prosthesis in the chewing function of the elderly

A medida que envejecemos, en la cavidad oral se producen cambios estructurales, por lo que adultos y adultos mayores requieren del uso de prótesis dental. Sin embargo, la implementación de la prótesis dental puede generar insatisfacción en relación a las diferentes funciones orofaciales. Se realizó una revisión de literatura con el propósito de determinar cómo el uso de prótesis dental afecta la función masticatoria en adultos mayores. La búsqueda consistió en artículos científicos originales en idioma español, inglés y portugués, sin límites temporales, en la base de datos PubMed y de forma manual. Se seleccionaron 45 artículos científicos tras la aplicación de filtros. El uso de prótesis dental afecta la función masticatoria en adultos y adultos mayores, siendo un factor crítico en términos de su nivel de satisfacción y calidad de vida, así como de la velocidad masticatoria, formación del bolo y preferencia de alimentos.

As we grow old, structural changes occur in the oral cavity, so elderly people require the use of dental prostheses. However, the implementation of the dental prosthesis can generate dissatisfaction in relation to the different orofacial functions. A literature review was conducted to determine how the use of dental prosthesis affects masticatory function in elderly people. The review consisted of original scientific articles in Spanish, English and Portuguese, without time limits, in the PubMed database and manually. Forty-five scientific articles were selected after the application of filters. The use of dental prosthesis affects chewing function in adults and older adults, being a critical factor in terms of their level of satisfaction and quality of life, as well as masticatory speed, bolus formation and food preference.

Radiographic examination of fixed dental prostheses based on dental implants: Systematic and meta-analysis / 国际药学研究杂志

Background and aim: The aim of this systematic and meta-analysis was Radiographic Examination of fixed dental prostheses Based on Dental Implants. Methods: The search took place between 2015 and 2019. Database search was conducted using MEDLINE, PubMed, Cochrane Library, Embase, ISI, google scholar. In this study, we first reviewed the abstract of the articles and selected the studies that had the most coordination with our goals, and then we examined the entire text and finally, four studies were selected. Results: In this systematic review and meta-analysis, 137 patients were evaluated in this study. The mean age was 58.66. Just in one study, follow-up was 6-12 month was 60 and in two studies 36 month. No significant in all studies. Survival rate in three was 100%, just in one study was 98.7%. Conclusions: This systematic review and meta-analysis showed positive radiographic outcomes of fixed dental prostheses Based on Dental Implants.

A case of full mouth rehabilitation in patient with loss of vertical dimension and deep bite due to tooth wear / 대한치과보철학회지

The collapse of the posterior occlusion destroys the normal occlusal plane and causes excessive wear reducing the vertical dimension. Reduced vertical dimension of occlusion causes not only aesthetic and functional problems but also overloading on the temporomandibular joints and abnormalities of muscle nerve system. In order to improve the collapsed occlusal relationship, it is necessary to consider the change of the vertical dimension. It is necessary to make a precise diagnosis and analysis before the treatment and to evaluate the adaption of patient to the new vertical dimension of occlusion. A patient with excessive overbite often has occlusal problems of tooth wear and tooth eruption. Considering these considerations, overall prosthodontic restoration is required to solve the problem. A patient of 68 year old man in this case who suffered major tooth wear and maxillary posterior teeth loss was treated with elevation of vertical dimension of occlusion by maxillary removable dental prosthesis and mandibular fixed prosthesis.

Comparison of primary human gingival fibroblasts from an older and a young donor on the evaluation of cytotoxicity of denture adhesives

Abstract Denture adhesives (DA) improve the retention and stability of ill-fitting dentures, especially for older adults. These materials should be biocompatible, i.e., they cannot cause undesired biological responses and be non-cytotoxic to oral tissues. However, in vitro testing of DA biocompatibility employing primary cell culture may possibly be affected by other factors, such as the donor age. Objective To compare the cytotoxicity of three different denture adhesives when assessed in primary gingival fibroblasts from a young donor or from an older donor, as well as the release of the basic fibroblast growth factor (bFGF), and the inflammatory response marker interleukin-6 (IL-6). Material and Methods Gingival fibroblasts isolated from a 30- and a 62-year-old donor were assayed for proliferation (1-7 days) and sensitivity to latex (positive control). Fibroblasts were indirectly exposed to Corega Ultra (cream), Corega powder and Fixodent Original for a 24 h period and assayed by XTT and Crystal Violet tests. The release of IL-6 and bFGF by exposed cells was determined by ELISA. Results While cells from the young donor presented higher cell growth after 7 days, the sensitivity to increasing concentrations of latex extracts was very similar between young and older cells. Both XTT and CVDE detected no difference between the DA and the control group. All materials induced higher levels of IL-6 and bFGF compared to control. Cells from the older donor exposed to Corega Ultra released lower levels of cytokine and growth factor. Conclusions All materials were considered non-cytotoxic, but affected cytokine and growth factor release. The biological differences found between fibroblasts from both donors could be due to individual or age-related factors. The authors suggest the use of cells from older donors on studies of dental products aimed at older patients, to better simulate their physiological response.

Técnicas de afastamento gengival em prótese dental: revisão da literatura / Gingival retraction methods in dental prosthesis: literature review

A proposta desta revisão da literatura foi avaliar as técnicas empregadas no afastamento gengival para prótese dental incluindo métodos mecânicos, químicos-mecânicos e cirúrgicos. A técnica de afastamento gengival deve ser previamente avaliada pelo profissional e a sua indicação, dependerá de cada situação clínica. Nesta revisão foram apresentadas as vantagens e desvantagens das técnicas de afastamento gengival incluindo fio afastador embebido ou não em soluções químicas, técnicas cirúrgicas, procedimentos a base de laser, curetagem gengival e eletro cirurgia. Após a realização desta revisão verificamos que o método químico-mecânico é o mais utilizado pelos profissionais. Atualmente podemos considerar que mesmo com a utilização de tecnologias mais elaboradas, como por exemplo scanners intraorais, quando o término do preparo dental estiver ao nível gengival ou subgengival se faz necessário o afastamento gengival. Para atingir o sucesso de uma prótese dental e importante coexistir uma harmonia entre a prótese e os tecidos periodontais circunvizinhos. (AU)

The aim of this review was to assess the use of gingival retraction methods in the fixed tooth supported prosthesis including mechanical, chemicals-mechanical and surgical methods. The choice of the best gingival retraction technique should be considered previously by the professional and it depends of each individual clinical conditions. In this review were discussed the advantages and the disadvantages of each gingival retraction technique including mechanical, chemical and surgical methods. In this review, we could understand that chemicals-mechanical technical is the most indicate by dentists. Nowadays, we can consider that even with the hightech use in dental area, such as intraoral scanners, when the margin of the restoration is placed sub-gingivally the gingival retraction should be considered. For the successful in dental prosthesis, a healthy coexistence between the restoration and their surrounding periodontal structure should be the goal of a prosthodontist. (AU)

Quality of life in patients rehabilitated with implant-supported prostheses

Purpose: To evaluate the impact of rehabilitation with implant-supported prostheses on the quality of life (QoL) of patients. Methods: The OHIP-14 questionnaire was applied to 114 patients and information regarding gender, age, type of prosthesis and time of use were obtained. To analyze whether there were any statistically significant differences between the mean scores of the seven parameters of the OHIP-14, the Mann-Whitney and Kruskal-Wallis test were used. All data were evaluated using a significance level of 5%. Results: Patients were predominantly female (78.9%) and single crowns users (41.2%). Patients reported a good QoL (3.07). Psychological discomfort and physical pain were the worst dimensions evaluated by the subjects. Results differed significantly (p<0.05) only for functional limitations and psychological discomfort in the different genders. Conclusions: Patients presented a high level of quality of life, regardless of age, duration of use and the type of prosthesis used. However, women presented more psychological distress and functional limitations than men (AU)

Mechanical behavior of anterior fixed partial dentures made of different materials subjected to static and dynamic loads / Comportamiento mecánico de las prótesis parciales fijas anteriores fabricadas en diferentes materiales, sometidas a cargas estáticas y dinámicas

ABSTRACT. Introduction: the purpose of this study was to assess the mechanical behavior of lithium disilicate, alumina, and zirconia-based ceramic restorations, as well as metal-ceramic restorations, under static and dynamic load, in an upper anterior fixed site. Methods: four models of fixed partial dentures (FPD) were designed, representing alumina, zirconia, and metal-ceramic two-layered systems and a lithium disilicate monolithic system, with a 9 mm2 connector. The variables included were elastic modulus, Poisson's ratio, and ultimate tensile strength. A static load of 100 N was applied up to 800 N, as well as a dynamic load of 100 and 200 N, calculating von Mises stress and maximum and minimum principal stresses. Results: all models showed a greater concentration of stress under static and dynamic load on the connector region, without exceeding the maximum tensile stress of metal and ceramic structures. The two-layered models showed greater stress concentration on the veneering ceramic compared with the structure. Conclusions: all stresses concentrated on the connector region, producing failure risk at this point of the structures. The veneering ceramic has a greater probability of failure in all two-layered models. The disilicate model can be considered as an alternative for clinical use. The metal-ceramic dentures showed the best distribution on the connector compared to all other models, confirming that they are the gold standard.

RESUMEN. Introducción: el propósito de esta investigación consistió en conocer el comportamiento mecánico bajo carga estática y dinámica de las restauraciones cerámicas de alúmina, circonia y disilicato de litio, así como de las restauraciones metal-cerámicas, en un tramo fijo anterior superior. Métodos: se modelaron cuatro tramos en prótesis parcial fija (PPF), representando sistemas de dos capas para alúmina, circonia y metal-cerámica, y sistema monolítico para disilicato de litio, con un conector de 9 mm2. Las variables incluidas fueron el módulo de elasticidad, la razón de Poisson y el último esfuerzo tensil. Se aplicó una carga estática de 100 hasta 800 N y una carga dinámica de 100 y 200 N. Se calcularon los esfuerzos de von Mises, máximo y mínimo principal. Resultados: todos los modelos presentaron mayor concentración de esfuerzos bajo carga estática y dinámica en el área de los conectores, sin sobrepasar el esfuerzo máximo tensil de las estructuras cerámicas y metálica. Se observó que los modelos de dos capas mostraron mayor concentración de esfuerzos en la cerámica de revestimiento, en comparación con la estructura. Conclusiones: todos los esfuerzos se concentraron en el área del conector, generando un riesgo de falla en las estructuras en este punto. La cerámica de revestimiento presenta mayor probabilidad de falla en todos los modelos de dos capas. El modelo de disilicato permite ser considerado como una alternativa de uso en la clínica. Las prótesis metal-cerámicas presentan la mejor distribución en el conector, a diferencia de los otros modelos, lo que confirma que son el material de referencia.

ADHERENCIA DE Candida albicans A RESINAS ACRÍLICAS Y POLIAMIDAS: ESTUDIO IN VITRO / ADHERENCE OF Candida albicans TO ACRYLIC RESINES AND POLYAMIDES: STUDY IN VITRO

Objetivo: Determinar la adherencia de Candida albicans a resinas acrílicas y poliamidas. Materiales y métodos: Estudio experimental in vitro en el cual se realizaron 12 prótesis dentales, seis parciales acrílicas, elaboradas bajo la técnica de termo-curado, y seis en poliamidas mediante inyección; para el análisis se tomaron muestras de 2 mm de bordes irregulares, de diferentes zonas de la prótesis y se evaluaron variables tales como temperatura, tiempo de cocción, tipo de pulido, tipo de material para brillar, presencia de porosidades, tipo de abrasivo y aditamento para retirar excesos; las muestras se mantuvieron en agua destilada por dos días para retirar los excesos de monómero y posteriormente fueron incubadas en una suspensión de Candida albicans de referencia ATCC 10231 y evaluadas por microscopía electrónica de barrido. Resultados: En las resinas elaboradas en acrílicos se observaron poros, grietas, blastonidias y pseudomicelios. En las muestras de poliamidas también se observaron estos mismos hallazgos, pero en menor proporción. Conclusión: Se encontró adherencia en las 12 muestras evaluadas, se halló asociación estadísticamente significativa entre tipo de pulido y tipo de abrasivo con un valor de (p<0,05).

Objective: To determine the adherence of Candida albicans to polyamide and acrylic resins. Materials and Methods: In this experimental in vitro study 12 dental prostheses were made, 6 acrylic partial dentures which were elaborated under the heat-curing technique and 6 prosthesis made of polyamide by injection; 2 mm samples with irregular borders were taken from different areas of the prosthesis for analysis and variables such as temperature, heating time, polishing time, material used to shine, presence of porosities, accessory and abrasive used to remove excess were evaluated; the samples were held in distilled water for two days to remove the monomer excess and then they were incubated in a Candida albicans suspension strain ATCC 10231 and evaluated by scanning electron microscopy (SEM). Results: Porosities, cracks, blastospore and pseudohyphae were observed on the resins made from acrylic. The same results were observed on the samples made from polyamide to a lesser extent. Conclusion: Adhesion was found on the 12 samples evaluated. A statistically significant association was found between polishing type and abrasive type with a value of (p < 0.05).

Estandarización de prótesis dentales mediante codificación personal incluida en bases termoácido resistentes con fines de identificación forense / Dental prosthesis standarization by means of thermal-acid resistant-included personal code, for forensic identification purposes

La identificación categórica de un cadáver no sólo es importante por razones humanitarias y emocionales, sino también por sus efectos legales y administrativos. Durante el proceso de identificación humana, toda la información necesaria se obtiene del cuerpo desconocido de la víctima, permitiendo cumplir el objetivo de que su perfil sea reconstruido. Se utilizan sistemas de marcado y etiquetado de prótesis dentales en diferentes situaciones, detallándose métodos directos e indirectos para tal fin. Se propone la incorporación del número del documento nacional de identidad (DNI) en todas las prótesis removibles y fijas, con el fin de adoptar un único y definitivo código de identificación personal con el objetivo de lograr un método uniforme, estandarizado, sencillo y rápido para la identificación forense en pacientes atendidos en la Facultad de Odontología de la Universidad de Buenos Aires.

The categorical identification of a corpse is not only important for humanitarian and emotional reasons, but also for legal andadministrative purposes. During the human identification process, all necessary information is gathered from the unknown body of thevictim and hence that an objective reconstructed profile can be established. Denture marking and labeling systems are being used in varioussituations, and a number of direct and indirect methods are reported. Is proposed that national identity number (DNI) be incorporated inall removable and fixed prostheses, so as to adopt a single and definitive personal identification code with the aim of achieving a uniform,standardized, easy, and fast identification method in patients treated at the Faculty of Dentistry at the University of Buenos Aires forforensic identification.

Factores locales y su relación con lesiones bucales en ancianos portadores de prótesis totales / Local factors and their relationship with oral lesions in elderly with total prostheses

Se realizó un estudio descriptivo y transversal de 96 senescentes portadores de prótesis totales, atendidos en la Clínica Estomatológica Lidia Doce Sánchez de Guantánamo, desde enero de 2014 hasta abril de 2015, con vistas a determinar la relación entre los factores locales y las lesiones de la mucosa bucal presentes en estos ancianos. La información se recogió en un formulario confeccionado al efecto. Se analizaron las siguientes variables: edad, hábitos tóxicos, enfermedades sistémicas e ingestión de medicamentos. Se utilizaron métodos del nivel teórico y empírico. En la serie predominaron el hábito de fumar, la diabetes y la anemia. Se recomendó profundizar en la relación entre las lesiones bucales y los factores locales, así como el uso de prótesis dentales en los adultos mayores

A descriptive and cross-sectional study of 96 elderly with total prostheses was carried out. They were assisted at Lidia Doce Sánchez Stomatological Clinic in Guantánamo from January, 2014 to April, 2015, with the purpose of investigating the relationship between the local factors and the oral mucous lesions in these elderly. The information was compiled in a form elaborated for this purpose. The following variables were analyzed: age, toxic habits, systemic diseases and medicine consumption. The methods of theoretical and empirical level were used. In the series there was a prevalence of smoking habit, diabetes and anemia. It was recommended deepening in the relationship between the oral lesions and the local factors, as well as the use of dental prostheses in the elderly