Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 25
Filtrar
1.
Braz Oral Res ; 31: e18, 2017 02 23.
Artículo en Inglés | MEDLINE | ID: mdl-28273197

RESUMEN

This study evaluated the stress behavior around short implants in edentulous atrophic mandibles. Six groups included implants with two diameters regular and wide (4 and 5 mm) and three lengths (5, 7 and 9 mm) as follows: Ci9 (9 x 4 mm), Ci7 (7 x 4 mm), Ci5 (5 x 4 mm), Wi9 (9 x 5 mm), Wi7 (7 x 5 mm) and Wi5 (5 x 5 mm). These groups were compared to the control group CG (11 x 4 mm). The analysis was performed with the photoelastic method (n = 6). Each model comprised 4 implants with the same length and diameter connected by a chromium-cobalt bar that simulates a fixed denture. A 0.15 kg force was applied at the end of the cantilever (15 mm), and the maximum shear stress was recorded around the distal and subsequent implants. The stress values were determined, and the quantitative data (Fringes®) were submitted to statistical analysis with one-way ANOVA and the Dunnett test (p < 0.05). It was observed that the reduction in implant length increased stress values with a significant difference (p < 0.05) between CG Ci7 and Ci5, while the increase in implant diameter reduced the stress values without any differences found between short and long implants. Implants with 5 and 7 mm with regular diameter increased stress levels while short implants with larger diameters experienced similar stress to that of longer implants.


Asunto(s)
Implantes Dentales , Prótesis Dental de Soporte Implantado/métodos , Análisis del Estrés Dental/métodos , Dentadura Completa Inferior , Análisis de Varianza , Fenómenos Biomecánicos , Pilares Dentales , Diseño de Prótesis Dental , Elasticidad , Ensayo de Materiales , Modelos Dentales , Valores de Referencia , Resistencia al Corte , Estrés Mecánico , Soporte de Peso
2.
Braz. oral res. (Online) ; 31: e18, 2017. tab, graf
Artículo en Inglés | LILACS | ID: biblio-839500

RESUMEN

Abstract This study evaluated the stress behavior around short implants in edentulous atrophic mandibles. Six groups included implants with two diameters regular and wide (4 and 5 mm) and three lengths (5, 7 and 9 mm) as follows: Ci9 (9 x 4 mm), Ci7 (7 x 4 mm), Ci5 (5 x 4 mm), Wi9 (9 x 5 mm), Wi7 (7 x 5 mm) and Wi5 (5 x 5 mm). These groups were compared to the control group CG (11 x 4 mm). The analysis was performed with the photoelastic method (n = 6). Each model comprised 4 implants with the same length and diameter connected by a chromium-cobalt bar that simulates a fixed denture. A 0.15 kg force was applied at the end of the cantilever (15 mm), and the maximum shear stress was recorded around the distal and subsequent implants. The stress values were determined, and the quantitative data (Fringes®) were submitted to statistical analysis with one-way ANOVA and the Dunnett test (p < 0.05). It was observed that the reduction in implant length increased stress values with a significant difference (p < 0.05) between CG Ci7 and Ci5, while the increase in implant diameter reduced the stress values without any differences found between short and long implants. Implants with 5 and 7 mm with regular diameter increased stress levels while short implants with larger diameters experienced similar stress to that of longer implants.


Asunto(s)
Implantes Dentales , Prótesis Dental de Soporte Implantado/métodos , Análisis del Estrés Dental/métodos , Valores de Referencia , Estrés Mecánico , Fenómenos Biomecánicos , Ensayo de Materiales , Análisis de Varianza , Pilares Dentales , Soporte de Peso , Diseño de Prótesis Dental , Resistencia al Corte , Modelos Dentales , Dentadura Completa Inferior , Elasticidad
3.
Full dent. sci ; 8(29): 114-122, 2016. ilus, tab
Artículo en Portugués | BBO - Odontología | ID: biblio-909742

RESUMEN

A fibromialgia é uma síndrome reumática caracterizada por quadros dolorosos intensos. A presença da dor muitas vezes chega a causar incapacidade e indisposição, mesmo para realização de atividades rotineiras, bem como parece afetar o sono em grande parte dos pacientes. Acredita-se que a perpetuação de alterações no padrão de sono crie uma situação cíclica que intensifica os quadros dolorosos e a fadiga. Os distúrbios temporomandibulares (DTM) que são caracterizados por quadros de dor também vêm sendo relacionados com alterações no sono. Essas duas condições, apesar de distintas, parecem coexistir em um grande número de portadores de fibromialgia, levando-se a pesquisas que visam buscar a influência dessa relação como causa e efeito dentro deste grupo de pacientes. Neste contexto, este trabalho teve o objetivo de recolher informações dentro da literatura sobre essas duas condições, sua influência nas alterações do sono, bem como reunir estudos que busquem esclarecer a relação existente entre as duas condições. Para isto foram reunidos trabalhos publicados na base de dados PubMed, LILACSeMEDLINEutilizando-se os termos fibromialgia, DTM e sono, nos idiomas inglês e português. Os trabalhos apontam que há uma prevalência alta entre mulheres e que os portadores de fibromialgia apresentam alterações específicas no padrão de sono, bem como há uma importante correlação desta condição com os distúrbios temporomandibulares (AU).


Fibromyalgia syndrome is characterized by severe painful conditions. The presence of pain can result in some disability and even unwillingness to perform routine activities, and seems to affect sleep in most patients. It is believed that the changes in sleep pattern creates a cyclic condition and can increase fatigue painful conditions. The temporomandibular disorder (TMD) is characterized by pain frameworks have also been related to changes in sleep. These two conditions, while distinct, seem to coexist in a large number of patients with fibromyalgia, leading several researchs concerning the influence of this relationship within this group of patients. Therefore, this work aimed to collect information in the literature on these two conditions, its influence on sleep disorders as well as gathering studies that seek to clarify the relationship between these two conditions. For this were selected studies published in PubMed, LILACS, and MEDLINE using the terms fibromyalgia, TMD and sleep, in English and Portuguese. The studies indicate that there is a high prevalence among women and that patients with fibromyalgia have specific changes in sleep patterns, and there is a significant correlation of this condition with temporomandibular disorders (AU).


Asunto(s)
Fibromialgia , Trastornos del Sueño-Vigilia , Síndrome de la Disfunción de Articulación Temporomandibular , Brasil
4.
Int. j. odontostomatol. (Print) ; 9(2): 205-211, ago. 2015. ilus
Artículo en Inglés | LILACS | ID: lil-764032

RESUMEN

The aim of this research was to evaluate the load distribution in tilted distal implants used in the all-on-four system. Two implant schemes were used. In both, two vertical anterior implants and tilted posterior implants were installed, one group with an angulation of 15 and another with an angulation of 35. The implants were installed together with a bar binding them all in a photoelastic model obtained from a replica of an edentulous maxilla. In this model, loads were produced in the sector of the bar cantilever, the abutment of the tilted implants and over the four implants using devices specially designed for this purpose. The bands were recorded with a digital camera, and the qualitative and quantitative analyses were carried out by means of student's t-test and the Mann-Whitney test in Biostat v. 5.0, considering a level of p<0.05 to establish a statistically significant relation. In the qualitative analysis, the implant with 35 presented the greatest amount of stress on the cantilever forces at cervical level. The quantitative studies showed fewer differences in all aspects assessed, although significant differences were observed between the two systems when loads were applied at cantilever level. It can be concluded that there are minimal differences in the stress distribution when comparing implants with angulations of 15 or 35. However, there is a greater concentration of stress at the cervical level in implants tilted to 35.


El objetivo de esta investigación fue evaluar la distribución de cargas en implantes angulados distales utilizados en el sistema "All-On-Four". Dos esquemas de implantes fueron empleados. En ambos, dos implantes verticales en el área anterior y dos implantes angulados en el sector posterior fueron instalados, utilizando angulaciones de 15 y 35 o en estos últimos. Los implantes fueron instalados de forma conjunta mediante una barra unida al sistema de resina fotoelástica obtenida de una replica de una maxila edéntula. En este modelo, las cargas fueron producidas en el sector del cantiléver de la barra, el pilar del implante angulado y, mediante un sistema genérico, sobre la totalidad de los implantes. Las bandas de estrés fueron reconocidas en una cámara digital donde los análisis cualitativos y cuantitativos fueron realizados utilizando las pruebas t de Student y Mann-Whitney en el programa computacional Biostat v. 5.0, considerando un valor de p<0,05 para establecer diferencias significativas. En el análisis cualitativo, los implantes con 35 presentaron una gran cantidad de estrés en el área de cantiléver, principalmente a nivel cervical. Los estudios cuantitativos mostraron limitadas diferencias en todos los aspectos, aunque diferencias significativas fueron alcanzadas cuando se compararon ambos sistemas después de la carga a nivel del cantiléver. Se puede concluir que hay diferencias menores en la distribución de estrés cuando se comparan implantes dentales con angulación de 15 y 35. Sin embargo, existe una mayor cantidad de concentraciones de estrés a nivel cervical en los implantes con 35 de angulación.


Asunto(s)
Humanos , Implantes Dentales , Análisis del Estrés Dental , Maxilar/cirugía , Estrés Mecánico , Fenómenos Biomecánicos , Ensayo de Materiales/métodos , Prótesis Dental de Soporte Implantado
5.
Rev Bras Reumatol ; 55(2): 189-94, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25440696

RESUMEN

Fibromyalgia syndrome (FMS) is a chronic painful syndrome and the coexistence of a painful condition caused by Temporomandibular Disorders (TMD) and FMS has been frequently raised for several studies, however, more likely hypothesis is that a set of FMS characteristics may lead to the onset of TMD symptoms and they are not merely coexisting conditions. Therefore, our aim is presenting a review of literature about the relation between fibromyalgia and the signs and symptoms of temporomandibular disorders. For this purpose, a bibliographic search was performed of the period of 1990-2013, in the Medline, Pubmed, Lilacs and Scielo databases, using the keywords fibromyalgia, temporomandibular disorders and facial pain. Here we present a set of findings in the literature showing that fibromyalgia can lead to TMD symptoms. These studies demonstrated greater involvement of the stomatognathic system in FMS and myogenic disorders of masticatory system are the most commonly found in those patients. FMS appears to have a series of characteristics that constitute predisposing and triggering factors for TMD.


Asunto(s)
Fibromialgia/complicaciones , Trastornos de la Articulación Temporomandibular/etiología , Humanos
6.
Int J Dent ; 2014: 206723, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25374603

RESUMEN

The aim of this study was to evaluate by photoelastic analysis stress distribution on short and long implants of two dental implant systems with 2-unit implant-supported fixed partial prostheses of 8 mm and 13 mm heights. Sixteen photoelastic models were divided into 4 groups: I: long implant (5 × 11 mm) (Neodent), II: long implant (5 × 11 mm) (Bicon), III: short implant (5 × 6 mm) (Neodent), and IV: short implants (5 × 6 mm) (Bicon). The models were positioned in a circular polariscope associated with a cell load and static axial (0.5 Kgf) and nonaxial load (15°, 0.5 Kgf) were applied to each group for both prosthetic crown heights. Three-way ANOVA was used to compare the factors implant length, crown height, and implant system (α = 0.05). The results showed that implant length was a statistically significant factor for both axial and nonaxial loading. The 13 mm prosthetic crown did not result in statistically significant differences in stress distribution between the implant systems and implant lengths studied, regardless of load type (P > 0.05). It can be concluded that short implants showed higher stress levels than long implants. Implant system and length was not relevant factors when prosthetic crown height were increased.

7.
Braz Oral Res ; 282014.
Artículo en Inglés | MEDLINE | ID: mdl-25229789

RESUMEN

Conventional tilted implants are used in oral rehabilitation for heavily absorbed maxilla to avoid bone grafts; however, few research studies evaluate the biomechanical behavior when different angulations of the implants are used. The aim of this study was evaluate, trough photoelastic method, two different angulations and length of the cantilever in fixed implant-supported maxillary complete dentures. Two groups were evaluated: G15 (distal tilted implants 15°) and G35 (distal tilted implants 35°) n = 6. For each model, 2 distal tilted implants (3.5 x 15 mm long cylindrical cone) and 2 parallel tilted implants in the anterior region (3.5 x 10 mm) were installed. Photoelastic models were submitted to three vertical load tests: in the end of cantilever, in the last pillar and in the all pillars at the same time. We obtained the shear stress by Fringes software and found values for total, cervical and apical stress. The quantitative analysis was performed using the Student tests and Mann-Whitney test; p ≥ 0.05. There is no difference between G15 and G35 for total stress regardless of load type. Analyzing the apical region, G35 reduced strain values considering the distal loads (in the cantilever p = 0.03 and in the last pillar p = 0.02), without increasing the stress level in the cervical region. Considering the load in all pillars, G35 showed higher stress concentration in the cervical region (p = 0.04). For distal loads, G15 showed increase of tension in the apical region, while for load in all pillars, G35 inclination increases stress values in the cervical region.


Asunto(s)
Implantes Dentales , Prótesis Dental de Soporte Implantado/métodos , Dentadura Completa Superior , Módulo de Elasticidad , Análisis del Estrés Dental , Diseño de Dentadura , Humanos , Ensayo de Materiales , Modelos Biológicos , Valores de Referencia , Resistencia al Corte , Estadísticas no Paramétricas , Estrés Mecánico , Factores de Tiempo
8.
J Prosthet Dent ; 112(6): 1330-6, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25258265

RESUMEN

STATEMENT OF PROBLEM: Patients with myofascial pain experience impaired mastication, which might also interfere with their sleep quality. PURPOSE: The purpose of this study was to evaluate the jaw motion and sleep quality of patients with myofascial pain and the impact of a stabilization device therapy on both parameters. MATERIAL AND METHODS: Fifty women diagnosed with myofascial pain by the Research Diagnostic Criteria were enrolled. Pain levels (visual analog scale), jaw movements (kinesiography), and sleep quality (Epworth Sleepiness Scale; Pittsburgh Sleep Quality Index) were evaluated before (control) and after stabilization device use. Range of motion (maximum opening, right and left excursions, and protrusion) and masticatory movements during Optosil mastication (opening, closing, and total cycle time; opening and closing angles; and maximum velocity) also were evaluated. Repeated-measures analysis of variance in a generalized linear mixed models procedure was used for statistical analysis (α=.05). RESULTS: At baseline, participants with myofascial pain showed a reduced range of jaw motion and poorer sleep quality. Treatment with a stabilization device reduced pain (P<.001) and increased both mouth opening (P<.001) and anteroposterior movement (P=.01). Also, after treatment, the maximum opening (P<.001) and closing (P=.04) velocities during mastication increased, and improvements in sleep scores for the Pittsburgh Sleep Quality Index (P<.001) and Epworth Sleepiness Scale (P=.04) were found. CONCLUSION: Myofascial pain impairs jaw motion and quality of sleep; the reduction of pain after the use of a stabilization device improves the range of motion and sleep parameters.


Asunto(s)
Masticación/fisiología , Ferulas Oclusales , Sueño/fisiología , Síndrome de la Disfunción de Articulación Temporomandibular/fisiopatología , Adulto , Estudios Transversales , Femenino , Estudios de Seguimiento , Humanos , Mandíbula/fisiopatología , Movimiento/fisiología , Dimensión del Dolor/métodos , Rango del Movimiento Articular/fisiología , Fases del Sueño/fisiología , Síndrome de la Disfunción de Articulación Temporomandibular/terapia , Adulto Joven
9.
Braz. j. oral sci ; 13(3): 193-197, Jul-Sep/2014. tab
Artículo en Inglés | LILACS | ID: lil-725353

RESUMEN

AIM: To compare temporomandibular (TMD) subgroups classified according to the presence of localized pain (LP) or widespread pain (WP) in order to assess the quality of life domains and verify which components affect most the functional capacity of facial pain patients. METHODS: A cross-sectional study was conducted and the Short Form-36 Health Survey was applied in order to assess quality of life. Thirty-nine TMD/WP patients, 37 TMD/LP patients and 40 subjects free of TMD complaints were evaluated. RESULTS: TMD/WP patients differed significantly from healthy controls in all SF-36 components and TMD/LP patients ranked between them. It was also observed that patients with bodily pain and TMD with WP are respectively, 4.16 and 49.42 times more likely to have low functional capacity. CONCLUSIONS: Functional capacity in TMD subgroups was only affected by the presence of bodily pain and WP. These patients feature high chance of low functional capacity. Furthermore, TMD patients with localized and widespread pain share role-emotional impairments...


Asunto(s)
Humanos , Masculino , Femenino , Dolor Facial , Calidad de Vida , Síndrome de la Disfunción de Articulación Temporomandibular
10.
Braz Oral Res ; 28: 67-73, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25000604

RESUMEN

This study's aim was to evaluate the stress distribution in a mandibular implant-supported prosthesis and peri-implant bone considering implant quantity, diameter and position using linear 3-D finite element analysis. Models of an anterior jaw comprised 4 groups according to implant quantity, diameter, and position: control group C, 5 regular implants; R, 3 regular implants; W, 3 wide implants; and DTR, 3 regular implants with the distal ones tilted 30° distally. The cantilever was loaded with an axial load of 50 N. Data was evaluated using von Mises stress on implants and maximum principal stress and microstrain on the bone. The W group showed the lowest value of maximum principal stress in peri-implant bone of the loaded side (4.64 MPa) when compared to C (5.27 MPa), DTR (5.94 MPa), and R (11.12 MPa). Lower stress values in the loaded implants were observed in the experimental groups when compared to the C group. However, the unloaded implants presented opposite results. All the screws of the W group presented lower stress values when compared to the C group. However, the R and DTR groups presented an increase in stress values with the exception of the loaded screw. A reduction in the number of implants associated with wider implants reduced the stress in the bone and prosthetic components.


Asunto(s)
Diseño de Prótesis Dental/métodos , Prótesis Dental de Soporte Implantado/métodos , Análisis del Estrés Dental , Arcada Edéntula/rehabilitación , Tornillos Óseos , Pilares Dentales , Análisis de Elementos Finitos , Humanos , Imagenología Tridimensional , Ilustración Médica , Modelos Anatómicos , Valores de Referencia , Reproducibilidad de los Resultados
11.
Anticancer Res ; 34(4): 1993-9, 2014 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-24692737

RESUMEN

There is controversy concerning the effect of pilocarpine in the reversal of radio-induced xerostomia; however, the tests are usually performed at the end of radiotherapy. The present study evaluated the radioprotective effects of pilocarpine when ingested during radiation treatment. Eleven patients (recently diagnosed with head and neck cancer who were not undergoing radiotherapy) were divided into two groups: the control group (saline solution intake n=6) and the pilocarpine-treated (5 mg pilocarpine three times daily, n=5) group, in a prospective and double-blinded study. For five weeks, oral conditions, unstimulated salivary flow and stimulated saliva flow were collected weekly, with the first collection occurring prior to radiation therapy. As early as the second week, the control group exhibited oral complications and greater reduction in salivary flow rate. At the end of the study, the pilocarpine-treated group presented mean values of salivary flow greater than those of the control group. Pilocarpine intake applied simultaneously with radiotherapy demonstrated encouraging results with regard to lowering salivary flow reduction and incidence of xerostomia, as well as of oral complications.


Asunto(s)
Pilocarpina/administración & dosificación , Protectores contra Radiación/administración & dosificación , Radioterapia/efectos adversos , Glándulas Salivales/efectos de los fármacos , Glándulas Salivales/efectos de la radiación , Administración Oral , Neoplasias de Cabeza y Cuello/complicaciones , Neoplasias de Cabeza y Cuello/radioterapia , Humanos , Pilocarpina/uso terapéutico , Protectores contra Radiación/uso terapéutico , Resultado del Tratamiento , Xerostomía/etiología
12.
J Prosthodont ; 23(6): 504-8, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-24750357

RESUMEN

This report presents a prosthetic technique for the improvement of surgically positioned, buccally placed zygomatic implants with the use of custom abutments for improved retention screw position and an esthetic implant reconstruction. The patient presented four zygomatic implants with pronounced buccal inclination. The anterior implants were inclined toward the location where the anterior artificial teeth should be placed during rehabilitation. As the manufacturer does not provide angulated abutments, we attempted the waxing and overcasting of a prosthetic abutment, repositioning the access holes of the prosthetic screws to a more palatal position. This clinical report demonstrates that abutment customization could be an interesting way to relocate the access holes of the prosthetic screws in cases of zygomatic implants with pronounced buccal inclination.


Asunto(s)
Diseño de Implante Dental-Pilar , Implantes Dentales , Diseño de Dentadura , Cigoma/cirugía , Atrofia , Aleaciones de Cromo/química , Bases para Dentadura , Dentadura Completa Superior , Femenino , Estudios de Seguimiento , Humanos , Registro de la Relación Maxilomandibular , Arcada Edéntula/rehabilitación , Maxilar/patología , Persona de Mediana Edad , Diente Artificial , Resultado del Tratamiento
13.
Braz. oral res ; 28(1): 67-73, Jan-Feb/2014. tab, graf
Artículo en Inglés | LILACS | ID: lil-696994

RESUMEN

This study's aims was to evaluate the stress distribution in a mandibular implant-supported prosthesis and peri-implant bone considering implant quantity, diameter and position using linear 3-D finite element analysis. Models of an anterior jaw comprised 4 groups according to implant quantity, diameter, and position: control group C, 5 regular implants; R, 3 regular implants; W, 3 wide implants; and DTR, 3 regular implants with the distal ones tilted 30º distally. The cantilever was loaded with an axial load of 50 N. Data was evaluated using von Mises stress on implants and maximum principal stress and microstrain on the bone. The W group showed the lowest value of maximum principal stress in peri-implant bone of the loaded side (4.64 MPa) when compared to C (5.27 MPa), DTR (5.94 MPa), and R (11.12 MPa). Lower stress values in the loaded implants were observed in the experimental groups when compared to the C group. However, the unloaded implants presented opposite results. All the screws of the W group presented lower stress values when compared to the C group. However, the R and DTR groups presented an increase in stress values with the exception of the loaded screw. A reduction in the number of implants associated with wider implants reduced the stress in the bone and prosthetic components.


Asunto(s)
Humanos , Análisis del Estrés Dental , Diseño de Prótesis Dental/métodos , Prótesis Dental de Soporte Implantado/métodos , Arcada Edéntula/rehabilitación , Tornillos Óseos , Pilares Dentales , Análisis de Elementos Finitos , Imagenología Tridimensional , Ilustración Médica , Modelos Anatómicos , Valores de Referencia , Reproducibilidad de los Resultados
14.
Prosthes. Lab. Sci. ; 3(9): 71-76, out.-dez. 2013. ilus
Artículo en Portugués | BBO - Odontología | ID: biblio-853838

RESUMEN

Introdução: As próteses provisórias sobre implante seguem os preceitos das próteses convencionais, tendo como princípio básico para o sucesso o respeito aos tecidos de suporte. Portanto, é necessário um acompanhamento das respostas destes tecidos após a instalação da peça protética. Objetivo: Este relato descreve um protocolo de acompanhamento e ajustes de uma prótese provisória fixa sobre implantes correlacionando a anatomia final da prótese à capacidade de higienização alcançada pelo paciente durante esse período. Conclusão: Na fase provisória assistida foi possível detectar a necessidade de redução do contorno lingual e adequação da margem cervical para facilitar o acesso à higienização e restaurar a saúde periodontal


Asunto(s)
Humanos , Femenino , Protocolos Clínicos , Pulido Dental , Prótesis Dental de Soporte Implantado , Restauración Dental Provisional
15.
Full dent. sci ; 4(16): 580-589, out. 2013.
Artículo en Portugués | LILACS, BBO - Odontología | ID: lil-695732

RESUMEN

Os sistemas cerâmicos apresentam uma incrível evolução na busca implacável pela estética. A união desses sistemas aos metais foi necessária em um primeiro momento para compensar a friabilidade intensa que esses sistemas apresentavam inicialmente. Todo o processo de evolução desse grupo de materiais gira em torno de abrir mão do metal, retirando-os dos processos de reabilitação. O grande impasse é alcançar com as cerâmicas a resistência que o metal proporciona e por isso as pesquisas se concentram em reforçar os sistemas cerâmicos tornando-os capazes de resistir às forças e tensões geradas durante a função mastigatória. O objetivo deste trabalho é relatar esse processo de evolução tornando o entendimento sobre esse tema mais fácil, assim como esclarecer, dentro de uma classificação simplificada, a indicação, o potencial de resistência e grau de translucidez dentre os diversos sistemas. Através do levantamento bibliográfico, pode-se afirmar que atualmente é totalmente possível a realização de restaurações unitárias em qualquer posição no arco dentário. Já para reabilitações com próteses extensas, principalmente na região de molares, essa escolha deve ser bastante criteriosa. Dispomos de sistemas cerâmicos para confecção de copings altamente capazes de resistir à carga, mas estudos clínicos randomizados de longo prazo ainda são necessários para avaliar a vida útil desse tratamento.


Ceramic systems represent an incredible evolution in the search for aesthetics. In a first moment the association of these systems with metals was necessary to compensate its low resistance. The evolution of this group of materials is moving toward giving up the metal material, removing them from the oral rehabilitation. The major objective is to obtain a ceramic with the same resistance provided by the metal and therefore most researches are focused on strengthening the ceramic systems so that they can resist to the pressure generated during masticatory function. The aim of this work is to describe this process of evolution as well as clarify, within a simplified classification, the indication, the resistance and translucency of ceramic systems. Through literature review we can affirm that the realization of single crowns is possible in any position in the dental arch. For extensive rehabilitation with prostheses, especially in the molars region, this choice should be carefully evaluated. Currently, more resistant systems are used to ceramic copings highly capable of load resistance, but randomized clinical trials of long-term are still needed to evaluable the lifetime of the material.


Asunto(s)
Fenómenos Físicos , Porcelana Dental/uso terapéutico , Diseño Asistido por Computadora/instrumentación , Diseño Asistido por Computadora , Dentadura Parcial Fija , Rehabilitación Bucal/métodos
16.
J Conserv Dent ; 16(2): 139-43, 2013 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23716966

RESUMEN

PURPOSE: To evaluate the fracture strength of endodontically treated teeth with reduced coronal structure reinforced with glass-fiber posts and cast posts and core (nickel-chromium alloy) with different thickness. MATERIALS AND METHODS: Forty maxillary central incisors were sectioned at 1 mm of the cementoenamel junction and endodontically treated. The teeth were divided into four groups (n = 10) and restored with cast post and core and glass-fiber posts with diameters of 1.5 mm and 1.1 mm. The fracture strength was evaluated using a Universal Testing Machine (Instron 1144) at 45° of angulation. The results were submitted to analysis of variance two-way and Tukey's test (P < 0.05). The failure mode was also evaluated. RESULTS: Cast post and core were statistically superior to the glass-fiber posts with the self-post diameter (P = 0.001). When the self-post material was considered, no significant difference was observed between the two post-diameters (P = 0.749). The glass-fiber post-groups presented more fractures in the cervical third than the cast post and core groups. CONCLUSION: Teeth restored with cast post and cores present higher fracture strength than those reinforced with glass-fiber posts. An increased post-thickness does not increase the fracture strength. Glass-fiber posts lead to less severe fractures.

17.
Arch. oral res. (Impr.) ; 9(1): 85-90, Jan.-Apr. 2013. ilus
Artículo en Portugués | LILACS | ID: lil-754508

RESUMEN

Apesar do curto período no qual os dentes decíduos permanecem na cavidade bucal, possuem um papel fundamental no crescimento e desenvolvimento da criança. A perda prematura dos dentes decíduos pode ocasionar vários problemas funcionais, psicológicos e sociais. Objetivo: O presente artigo relata um caso de perda precoce de incisivo central decíduo devido a um trauma. A criança possuía o hábito de colocar e pressionar a língua no espaço correspondente ao dente perdido. Foi proposta a manutenção do espaço com o auxílio de uma prótese fixa adesiva. Conclusão: A prótese fixa adesiva constitui uma solução prática para os casos de perda precoce de dentes anteriores decíduos, pois é de fácil execução, conservadora e preenche os requisitos funcionais e estéticos da criança...


Despite the short period that the deciduous teeth remain in the mouth, they have an important role in the growth and development of the child. The premature loss of deciduous teeth can cause several functional, psychological and social problems. Objective: This article reports a case of early loss of deciduous central incisor due to trauma. The child had a habit of pressing his tongue against the space corresponding to the missing tooth. It was proposed to maintain the space using a fixed adhesive prosthesis. Conclusion: The fixed adhesive prosthesis is a practical solution in cases of early loss of primary teeth since it is easy to perform, conservative and meets the functional and aesthetic requirements of the child...


Asunto(s)
Humanos , Femenino , Preescolar , Dentadura Parcial Fija con Resina Consolidada , Restauración Dental Provisional/métodos , Diente Primario , Pérdida de Diente , Resultado del Tratamiento
18.
Cranio ; 31(1): 40-5, 2013 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-23461261

RESUMEN

This study aimed to investigate the prevalence of clinical features of temporomandibular disorders (TMD) in patients with fibromyalgia. The test group (FMG) consisted of 40 women with fibromyalgia (FM) compared to the control group of 40 healthy subjects using the research diagnostic criteria for temporomandibular disorders (RDC/TMD). The variables were compared using Fisher's exact test and a Mann-Whitney test. Facial pain was reported by 85% of the FM group, and 77.5% were diagnosed with myofascial TMD. Muscle pain during jaw movements, daytime bruxism/clenching, and limited mouth opening were significantly higher in the test group. There was no difference between groups in: (1) joint noises; (2) sleep bruxism/clenching; and (3) excursive or non-excursive movements. Classic signs of TMD, such as joint noise and self-reporting of clenching at night, are not associated with fibromyalgia syndrome as demonstrated in the current study. However, the self-reported daytime parafunctions, muscle pain in jaw movements, and limited mouth opening are features of the patients in the current study. This study revealed specific muscle involvement of TMD is also presence in FM.


Asunto(s)
Fibromialgia/complicaciones , Síndrome de la Disfunción de Articulación Temporomandibular/etiología , Bruxismo/complicaciones , Estudios de Casos y Controles , Distribución de Chi-Cuadrado , Músculos Faciales/fisiopatología , Dolor Facial/etiología , Femenino , Fibromialgia/fisiopatología , Humanos , Persona de Mediana Edad , Rango del Movimiento Articular , Estadísticas no Paramétricas , Síndrome de la Disfunción de Articulación Temporomandibular/fisiopatología
19.
Rev. dental press estét ; 10(1): 109-114, jan.-mar .2013. ilus
Artículo en Portugués | LILACS | ID: lil-681624

RESUMEN

Introdução: O sucesso estético em prótese dentária, seja em reabilitações extensas ou unitárias, se baseia na mimetização da peça protéica. A não percepção da substituição da estrutura dentária perdida é o objetivo atual na Odontologia Restauradora. A presença de manchas ou características específicas torna essa camuflagem mais difícil e, a necessidade de esconder a prótese torna-se um desafio. Descrever a confecção de uma prótese fixa metalocerâmica caracterizada em paciente diagnosticado com fluorose intensa e generalizada. Foi utilizada a técnica da estratificação com representação de manchas opacas através de ranhuras irregulares, bem como o registro fotográfico como método auxiliar na transmissão de informação entre o protesista e o laboratório. A caracterização das manchas se mostrou um método importante a ser considerado na reabilitação bucal, tornando o sorriso mais harmonioso


Introduction: The esthetic success of dental restorations in either extensive or unit cases is based on mimicking the prosthesis. Not percepting the lost tooth replacement is the current objective in restorative dentistry. Additionally, the presence of staining or specifc characteristics makes the dental camouflage more diffcult. In these cases, the need for hiding the prosthesis becomes a challenge. Objective: This report aims to describe the mimicking of a ceramic fxed partial denture in a patient diagnosed with severe and widespread fluorosis. Case report: The layering technique was used in this case, which allowed the characterization of the stains with irregular groves. It was also used the photographic record as an auxiliary method in information transmission between prosthodontist and laboratory. Conclusion: Mimicking of fxed partial denture was showed as an important alternative to be considered in oral rehabilitation, making the smile more harmonious.


Asunto(s)
Humanos , Femenino , Adulto , Dentadura Parcial Fija , Estética Dental , Fluorosis Dental , Rehabilitación Bucal , Coloración de Prótesis
20.
ImplantNews ; 10(3): 317-322, 2013. ilus, tab, graf
Artículo en Portugués | LILACS, BBO - Odontología | ID: lil-681592

RESUMEN

As técnicas existentes para posicionamento do implante zigomático geram variações no contato final osso/implante. Entretanto, clinicamente, não se sabe como isto afeta os valores de sobrevivência. O objetivo deste estudo foi verificar se diferentes modelos biomecânicos afetam os valores de dobramento em implantes zigomáticos não osseointegrados. Assim, duas investigações independentes foram realizadas; 60 implantes zigomáticos de 55 mm de comprimento foram utilizados. Na primeira etapa (M; n = 30), os implantes foram fixados em uma interface metálica. Na segunda etapa (B; n = 30), os implantes foram fixados em osso bovino congelado em temperatura controlada e retirados pouco antes do ensaio. Em cada etapa, as porções apicais dos implantes foram inseridas 8 mm, 10 mm e 12 mm nos blocos de fixação. Os implantes foram montados em 45 graus e submetidos à carga axial até deformação. Os valores máximos de dobramento foram registrados em quilogramas-força e o deslocamento em milímetros. Dentro de cada fase, os dados foram comparados pela análise de variância. O teste t Student foi usado para comparações entre as fases (nas respectivas profundidades de inserção). O nível de significância foi 5%. Na primeira etapa, as diferenças foram significativas apenas entre os grupos M8 e M12 (Anova um critério; p = 0,013). Entretanto, na segunda etapa, a comparação da força máxima entre os grupos não resultou em diferenças estatisticamente significantes. Os valores médios de dobramento nos grupos M foram estatisticamente maiores do que nos grupos B (p < 0,05). Pôde-se concluir que: a) nos modelos M, a resposta mecânica é melhor para implantes com 10 mm de inserção ou mais; b) o modelo biomecânico escolhido altera os valores de resistência ao dobramento.


Current techniques for zygoma dental implant placement can generate different bone-to-implant contact configurations. However, their influence on clinical survival rates is unknown. The aim of this study was to verify the influence of different biomechanical models on bending values for non-osseointegrated zygomatic fixtures. For this, two independent investigations were performed. Sixty 55 mm implants were used. In the first phase (M) (n=30), all implants were secured with a metallic interface. In the second phase (B) (n=30), implants were installed into fresh-frozen bone under controlled temperature conditions just before final test. Three insertion implant depths (8 mm, 10 mm, and 12 mm) were chosen. After, the implants were mounted in a 45-degree inclination and submitted to axial loading at the coronal portion until deformation. Maximum bending strength values were registered in kilograms-force and displacement in millimeters. The analysis of variance test was used to compare data among groups (within each phase). Also, a Student´s t test was performed to compare data between M and B depths. The level of significance was 5%. Significant differences were observed between M8 and M12 (one-way Anova; p = 0,013). However, no significant differences were among B groups. Bending values found in M were statistically higher than in B (p < 0,05). It can be concluded that: 1) In the M phase, the mechanical response is better for 10mm insertion depths or higher, and 2) the biomechanical model influences on the final strength values


Asunto(s)
Implantes Dentales , Ensayo de Materiales , Fenómenos Biomecánicos
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA