Influencia de las aleaciones metálicas en el color de la cerámica

El efecto cromático final de las restauraciones metalo-cerámicas se ve influenciado por el tipo de aleación metálica usada en su realización. En este estudio hemos realizado un análisis calorimétrico de 50 especímenes donde se combinan dos colores y cinco aleaciones diferentes. Después del análisis estadístico pertinente, se ha concluido que las aleaciones de base paladio plata son las que producen una variación más notoria del color, aumentando la saturación de amarillo y verde

Conical connection adjustment in prosthetic abutments obtained by different techniques

The goal of this study is to compare the misfit (>150µm) generated once the restoration, made by different techniques, is retained to a single conical implant. 15 internal connection implants (MIS C1 4?20x10mm) are embedded each one perpendicularly to an horizontal surface of the 1x1x2cm poliuretan resin model. The 15 samples obtained are divided in 5 groups depending on the framework process (n=3): 1/casting, 2/overcasting, 3/Ti-base, 4/milling and 5/laser sintering. The cobalt-chromium alloy frameworks are screw-retained to their respective implants to a 30-Ncm torque. Once it is retained the framework to the implant, the next step is to section the sample in half with a diamond saw and verify the correct fit with a stereomicroscope, measuring 4 distances in each side (A, B, C and D). Data is submitted to one-way analysis of variance (ANOVA). According to equality of variances, significant differences are found in A and B measures (p=0,000 in left side in both groups and, p=0,007 and p=0,001 in right side). In C and D, there are not statistical differences (p=0,586 and p=0,110 in left side and, p=0,101 and p=0,089 in right side). However, once it has realized ANOVA test, only C retains the hypothesis and accepts independence. More samples are needed to conclude reliable statements. However, what it is observed is that milled group presents the best marginal fit. Overcasted and Ti-Base abutments also have good results above casted ones, and, sintered groups has the lowest result. Although, all systems have gaps below 150 µm, so all of them are good options for prosthetic rehabilitation

Prosthetic assessment in cleft lip and palate patients : a case report with oronasal communication

The cleft lip and palate patient is mainly characterized by the presence of an oronasal communication, malformation or agenesis of the teeth close to the cleft, and deficient sagittal and transverse growth of the maxilla. These patients require various treatments involving a multidisciplinary team, which may include a maxillofacial surgeon, an orthodontist, a speech therapist, a paediatrician, a general dentist, a prosthodontist, an ENT specialist, a psychologist and all those professionals who can help provide functional, aesthetic and psychological improvement. This report describes a case of prosthetic rehabilitation in a patient with cleft lip and palate and an oronasal fistula (communication) following surgery. Different prosthetic treatments are described, with emphasis being placed on the approach chosen after to discuss the various limitations which arose

Diagnóstico o racionalidad en rehabilitación oral

Hablar de rehabilitación oral siempre ha sido motivo de contro­versias. Ha significado compleji­dad, dificultad, y, por qué no de­cirlo, habilidad. Muchos profesionales han bus­cado ayuda en la observación, dan­do lugar a la creación de aparatos simuladores que les permitiesen restaurar con seguridad el sistema estomatognático de sus pacientes. La función de la prótesis se con­virtió en el motivo de preocupa­ción para conseguir longevidad del tratamiento, más que el tratamien­to en sí..

Pre-Prosthetic surgical alterations in maxillectomy to enhance the prosthetic prognoses as part of rehabilitation of oral cancer patient

Objectives: After maxillectomy, prosthetic restoration of the resulting defect is an essential step because it signals the beginning of patient's rehabilitation. The obturator used to restore the defect should be comfortable, restore adequate speech, deglutition, mastication, and be cosmetically acceptable, success will depend on the size and location of the defect and the quantity and integrity of the remaining structures, in addition to pre-prosthetic surgical preparation of defect site. Preoperative cooperation between the oncologist surgeon and the maxillofacial surgeon may allow obturation of a resultant defect by preservation of the premaxilla or the tuberosity on the defect side and maintaining the alveolar bone or teeth adjacent to the defect. This study evaluates the importance of pre-prosthetic surgical alterations at the time maxillectomy on the enhancement of the prosthetic prognoses as part of the rehabilitation of oral cancer patient. Study Design: The study was carried out between 2003- 2008, on 66 cancer patients(41 male-25 female) age ranged from 33 to 72 years, at National Cancer Institute, Cairo University, whom underwent maxillectomy surgery to remove malignant tumor as a part of cancer treatment. Patients were divided in two groups. Group A: Resection of maxilla followed by preprosthetic surgical preparation. Twenty-four cancer patients (13 male - 11 female). Group B: Resection of maxilla without any preprosthetic surgical preparation. Forty-two cancer patients (28 male-14 female). Results: Outcome variables measured included facial contour and aesthetic results, speech understandability, ability to eat solid foods, oronasal separation, socializing outside the home, and return-to-work status. Flap success and donor site morbidity were also studied. Conclusions: To improve the prosthetic restoration of maxillary defect resulting maxillary resection as part treatment of maxillofacial tumor depends on the close cooperation between prosthodontist and surgeon, by combination of pre-prosthetic surgery during maxillectomy and prosthodontic technique. © Medicina Oral S. L

Eje de bisagra, ¿real o arbitrario?

El avance de la técnica en la toma de registros que nos ayuden en el diagnóstico y plan de tratamiento oclusal de un paciente nos ha conducido a obviar algunas de los principios básicos sobre los que se basa la cinemática mandibular permitiéndonos utilizar valores promedio que, aunque fundamentados científicamente, pueden significar el acúmulo de errores al final del tratamiento. El presente artículo pretende revisar la primera etapa de la cinemática mandibular y considerar la base sobre la cual los articuladores reproducen los movimientos de la mandíbula: el eje de bisagra

Signos de trastorno interno de la ATM sin dislocación meniscal ni enfermedad activa. Revisión a partir de un caso con exploración axiográfica y RMN

En la disfunción cráneomandibular se pueden presentar diversos signos, entre los chasquidos articulares. El presente trabajo hace una revisión a partir de un caso con chasquido articular y sin dislocación, lo cual induce a extremar el diagnóstico por implicaciones terapéuticas posteriores

Tratamiento odontológico integral en un paciente afecto de Corea de Huntington

Se presenta un caso de rehabilitación oral con prótesis fija en un paciente afecto de corea de Huntington, con retraso psíquico moderado y una importante descoordinación motriz. El tratamiento consistió en una primera fase bajo anestesia general (tratamiento odontología conservadora, tratamiento periodontal y exodoncias). En una segunda sesión, después de mantener unos niveles de placa dental correctos, se procedió al tallado de los dientes pilares y toma de registros oclusales, todo ello bajo sedación profunda. El resto de las pruebas ajuste de oclusión y cementado con premedicación psico-sedante

Complejidad versus simplicidad en prótesis total removible

En el presente trabajo valoramos los resultados a distancia (dos años) del método de elaboración de la Prótesis Total Removible, mediante la utilización de parámetros clínicos, con el fin de simplificar el proceso de elaboración de la Prótesis Total

Estudo Comportamental do Poli(metilmetacrilato) nos Rebasamentos Indirectos

ResumoO objectivo deste estudo em vitro foi comparar o comportamento do poli(metilmetacrilato) nos rebasamentos indirectos (Paladon® 65, Lucitone® Fas-PorTM e Palapress® Vario), em diferentes graus de espessura do material, utilizando diversos pontos da região palatina nos vários grupos de modelos. Realizamos 60 rebasamentos em modelos, divididos em 15 modelos com espessura de 1mm, 15 modelos com espessura de 2mm, 15 modelos com espessura de 3mm e 15 modelos com espessura de 4mm, com o intuito de produzir 900 unidades experimentais que foram medidas num Inverted Research Metallurgical Microscope. Os valores médios da distância na interface entre a resina acrílica dos rebasamentos e os modelos em gesso observados durante o estudo comportamental do poli(metilmetacrilato) nos rebasamentos indirectos, podem ser ordenados da seguinte forma:-Segundo a espessura μ1mm<μ2mm<μ3mm<μ4mm-Tipo de resina utilizado: μPalapress Vario<μLucitone<μPaladon 65-Localização dos pontos de medição do palato μP3<μP4<μP1<μP5-Corte transversal efectuado: μCorte A<μCorte B<μCorte CEm conclusão: Os rebasamentos realizados com resina auto-polimerizável Palapress vario, nas espessuras de 1mm e 2mm e o ponto 3 correspondente ao ponto médio do palato, obtiveram os melhores resultados (p<0.01).AbstractThe objective of the present study was the comparison between the behaviour of various polymethyl metacrylates (Paladon® 65, Lucitone® Fas-porTM e Palapress® Vario) utilised in indirect denture reline, involving distinct regions of the palatal surface of the various groups of models, and relative to specific degree of thickness. A total of 60 reline models where elaborated, divided into 4 groups of 15 in accordance to thickness; 1mm thickness, 2mm thickness, 3mm thickness, and 4mm thickness, with the objective of achieving 900 experimental units, witch where Microscope. subsequently analyzed under an Inverted Research MetallurgicalThe ordinate values relative to the mean distance on the interface, between the acrylic resin of indirect reline and the casts, values of the various polymethyl metacrylates utilized in indirect reline the present study is as follows:-In accordance to thickness μ1mm<μ2mm<μ3mm<μ4mm-Type of resin utilized: μPalapress Vario<μLucitone<μPaladon 65-Location of palatal measurement points: μP3<μP4<μP1<μP5-Transverse section: μCorte A<μCorte B<μCorte CIn conclusion: The best reline results (p<0.01), was achieved with the utilization of Palapress® Vario, an auto-polymerized resin, at the measurement point corresponding to the palatal midline (point 3), and 1mm and 2mm thickness