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Search Results: 1 - 10 of 183001 matches for " Henrique Duque de Miranda; Mazzonetto "
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Early Osseous Tissue Formation Associated to Submerged and Non-Submerged Dental Implants: A Histomorphometric Animal Study
Olate,Sergio; Chaves Netto,Henrique Duque de Miranda; Mazzonetto,Renato; Albergaria-Barbosa,Jose Ricardo de;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000100023
Abstract: the purpose of this research was to compare the bone formation around submerged and non-submerged implants installed in a mandible of dog. seven beagle dogs were used in this protocol; initially, was performed extraction of posterior teeth of mandible and after 3 month healing were installed two dental implants with surface treatment (subtraction of titanium via acidification) in each hemimandible. a transmucosal healing screw of 7 mm without oclusal contact was installed at the anterior implant as a model of non-submerged implant; in the posterior implant were installed a cover screw, using the submerged technique. after six weeks of healing, histomorphometric analysis of osseous tissue between the threads was performed. was analyzed the implant unit as well as the cervical, meddle and apical region of implant. student t test with 5% significance was used. the non-submerged implant model showed more bone formation than submerged implant without statistically significance (p=0.106); for regional analyses, cervical area shows more osseous formation than middle and apical areas. the regional analyses did not present statistical difference between areas for comparative analysis of submerged and non-submerged implant model. non-submerged implant model it's not an obstacle for osseous formation.
Early Osseous Tissue Formation Associated to Submerged and Non-Submerged Dental Implants: A Histomorphometric Animal Study Formación Temprana de Tejido óseo Asociado a Implantes Dentales Sumergidos y no Sumergidos: Un Estudio Histomorfométrico Animal
Sergio Olate,Henrique Duque de Miranda Chaves Netto,Renato Mazzonetto,Jose Ricardo de Albergaria-Barbosa
International Journal of Morphology , 2012,
Abstract: The purpose of this research was to compare the bone formation around submerged and non-submerged implants installed in a mandible of dog. Seven beagle dogs were used in this protocol; initially, was performed extraction of posterior teeth of mandible and after 3 month healing were installed two dental implants with surface treatment (subtraction of titanium via acidification) in each hemimandible. A transmucosal healing screw of 7 mm without oclusal contact was installed at the anterior implant as a model of non-submerged implant; in the posterior implant were installed a cover screw, using the submerged technique. After six weeks of healing, histomorphometric analysis of osseous tissue between the threads was performed. Was analyzed the implant unit as well as the cervical, meddle and apical region of implant. Student t test with 5% significance was used. The non-submerged implant model showed more bone formation than submerged implant without statistically significance (p=0.106); for regional analyses, cervical area shows more osseous formation than middle and apical areas. The regional analyses did not present statistical difference between areas for comparative analysis of submerged and non-submerged implant model. Non-submerged implant model it's not an obstacle for osseous formation. El objetivo de esta investigación fue comparar la formación ósea alrededor de implantes dentales sumergidos y no sumergidos instalados en mandíbula de perro. Siete perros Beagle fueron utilizados en este protocolo; inicialmente fueron realizadas las exodoncias de dientes posteriores de mandíbula y luego de 3 meses de recuperación fueron instalados dos implantes dentales con tratamiento de superficie en cada hemimandíbula (substracción de titanio vía acidificación). En el implante anterior fue instalado también un conector transmucoso de 7 mm sin contacto oclusal y en el implante posterior fue instalado el tornillo de cierre. Luego de 6 semanas de recuperación, se realizó un análisis histomorfométrico del tejido óseo presente entre las roscas. Se analizó el implante como unidad así como también sus sectores cervical, medio y apical. Se utilizó la prueba estadística t de student con 5% de significancia estadística. El implante no sumergido presentó mayor formación ósea sin diferencias estadísticamente significativa (p=0.106); en los análisis regionales, el área cervical presentó mayor formación ósea que las áreas medianas y apicales. El análisis regional no presentó diferencias estadísticamente significativas entre ambos tipos de implante. El modelo de implante no sume
Bifocal Distraction in Patient with Rheumatoid Arthritis and Severe Condylar Degeneration: Report of Case
Chaves Neto,Henrique Duque de Miranda; Olate,Sergio; Mazzonetto,Renato; Spagnoli,Daniel B;
International Journal of Morphology , 2011, DOI: 10.4067/S0717-95022011000100033
Abstract: facial involvement in patients with rheumatoid arthritis is variable depending on the type, onset, and duration of the disease. the treatment of patients with open bite resulting from degenerative changes on the condyles can be a challenge for the surgeon. rheumatoid arthritis is a systemic disorder of unknown etiology characterized by chronic inflammation and proliferation of synovial tissue. studies showed that patients with rheumatoid arthritis can developed progressive osteoarthrosis that result in gross radiographic changes in the condyles. with the development of distraction osteogénesis for treatment of mandible hypoplasia a new chapter has been opened in the surgical management of patients with rheumatoid arthritis associated with skeletal deficiency. the aim of this paper is to evaluate osteogenesis distraction for treatment of anterior open bite in patients with rheumatoid arthritis and severe condylar degeneration.
Análisis Descriptivo de la Reparación ósea Asociada a Implantes Dentales Endóseos Instalados en Perros con Técnica Sumergida en Dos Períodos de Evaluación Descriptive Analyses of Osseous Repair Related to Endosseous Dental Implant Installed in Dogs with Submerged Technique in Two Evaluation Period
Sergio Olate,Henrique Duque de Miranda Chaves-Netto,Miguel Jaimes,Renato Mazzonetto
International Journal of Morphology , 2009,
Abstract: Los implantes oseointegrados forman parte de la práctica clínica en diferentes disciplinas de la rehabilitación funcional y estética del hombre donde el área de la odontología no es una excepción; de esta forma, los implantes dentales son una respuesta a la gran demanda de paciente con edentulismo parcial o total. Existe una importante y creciente investigación en implantología, siendo imperativo reconocer las características histológicas de la reparación ósea cuando son instalados implantes dentarios. El objetivo de esta investigación es reconocer las características histológicas descriptivas de la reparación ósea asociada a la instalación de implantes dentales en dos periodos de evaluación. El modelo experimental utilizado en este estudio correspondió al de cinco perros sometidos a la exodoncia de premolares mandibulares bilaterales. Después de tres meses fueron instalados implantes bilaterales con dos dise os diferentes y con diferentes protocolos de carga. Los sacrificios de los animales fueron realizados después de tres y seis semanas de instalados los implantes. El estudio histológico descriptivo se desarrolló en el tejido adyacente a implantes instalados con técnica sumergida. Se observaron características de reparación ósea en los dos periodos de evaluación. El periodo de tres semanas presento tejido mineralizado en contacto con el implante y tejido conectivo no mineralizado en aumento desde la región superior hacia la inferior. Las regiones de reparación ósea fueron relacionadas con fenómenos de angiogénesis adyacentes. A las seis semanas se observo una mayor formación ósea, reemplazando las áreas de tejido conectivo no mineralizado por tejido mineralizado. Se observo también tejido óseo maduro con canales de Havers bien constituidos. Concluimos que existe una secuencia biológica de reparación ósea respetada en los dos periodos de evaluación, donde después de seis semanas es posible observar un tejido óseo bien constituido, teóricamente capaz de ser sometido a estrés. Osseointegrated implants are a part of clinical practice in different areas of the aesthetic and functional human rehabilitation where dentistry is not an exception; being like that, dental implants are a responses to great necessity of patient with partial or total dental lost. Exist an important and crescent research in implantology, being very important to recognize the histological characteristic of the osseous repair when dental implant are installed. The aim of this research was to recognize the histological descriptive characteristic of the osseous repair in two evaluation p
Bifocal Distraction in Patient with Rheumatoid Arthritis and Severe Condylar Degeneration: Report of Case Distracción Bifocal en Paciente con Artritis Reumatoide y Degeneración Condilar Severa: Reporte de un Caso
Henrique Duque de Miranda Chaves Neto,Sergio Olate,Renato Mazzonetto,Daniel B Spagnoli
International Journal of Morphology , 2011,
Abstract: Facial involvement in patients with rheumatoid arthritis is variable depending on the type, onset, and duration of the disease. The treatment of patients with open bite resulting from degenerative changes on the condyles can be a challenge for the surgeon. Rheumatoid arthritis is a systemic disorder of unknown etiology characterized by chronic inflammation and proliferation of synovial tissue. Studies showed that patients with rheumatoid arthritis can developed progressive osteoarthrosis that result in gross radiographic changes in the condyles. With the development of distraction osteogénesis for treatment of mandible hypoplasia a new chapter has been opened in the surgical management of patients with rheumatoid arthritis associated with skeletal deficiency. The aim of this paper is to evaluate osteogenesis distraction for treatment of anterior open bite in patients with rheumatoid arthritis and severe condylar degeneration. El compromiso facial en pacientes con artritis reumatoide es variable dependiendo del inicio, tipo y duración de la enfermedad. El tratamiento del paciente con mordida abierta resultante de procesos degenerativos condilares son desafiantes para los cirujanos. La artritis reumatoide es una enfermedad sistémica de etiología desconocida caracterizada por inflamación crónica y proliferación del tejido sinovial. Algunos estudios han demostrado que pacientes con artritis reumatoide pueden desarrollar osteoartrosis progresiva que resulta en importantes cambios condilares. Con el desarrollo de la distracción osteogénica para el tratamiento de la hipoplasia mandibular se abrió un nuevo capítulo en el manejo quirúrgico de pacientes con artritis reumatoide asociada a deficiencias esqueletales. El objetivo de este artículo es evaluar la aplicación de distracción osteogénica en un caso de mordida abierta anterior en paciente con artritis reumatoide y degeneración condilar severa.
Análisis Descriptivo de la Reparación ósea Asociada a Implantes Dentales Endóseos Instalados en Perros con Técnica Sumergida en Dos Períodos de Evaluación
Olate,Sergio; Chaves-Netto,Henrique Duque de Miranda; Jaimes,Miguel; Mazzonetto,Renato; Albergaria-Barbosa,Jose Ricardo de;
International Journal of Morphology , 2009, DOI: 10.4067/S0717-95022009000200023
Abstract: osseointegrated implants are a part of clinical practice in different areas of the aesthetic and functional human rehabilitation where dentistry is not an exception; being like that, dental implants are a responses to great necessity of patient with partial or total dental lost. exist an important and crescent research in implantology, being very important to recognize the histological characteristic of the osseous repair when dental implant are installed. the aim of this research was to recognize the histological descriptive characteristic of the osseous repair in two evaluation period. the experimental model in this research was five dogs submitted to dental extraction of mandibular bilateral bicuspid. after three month were installed bilateral implants with two implants design and different load protocols. the animals' sacrifices were realized three and six weeks after implants installation. the histological evaluation was realized in a tissue of implant with submerged techniques. was observed osseous repair characteristic for two evaluation period. for three weeks period was observed mineralized tissue in contact with implant and non mineralized connective tissue in increase from superior to inferior areas. reparation areas were related to adjacent angiogenic phenomena. for sex weeks period, was observed a major osseous formation, change connective tissue for mineralized tissue. was observed too matures osseous tissue with well formed havers channel. we conclude that exist a biological sequence of osseous repair present for a two evaluation period, where in a sex weeks is observed osseous tissue with good definition, theoretically capable for stress support.
El área Cervical de Implantes Dentales Presenta Mayor Formación ósea que el área Apical en Diferentes Condiciones de Dise o y Carga: Resultados Preliminares The Cervical Area of Dental Implants Present More Osseous Formation Than Apical Area in Different Load and Design Condition: Preliminary Results
Sergio Olate,Henrique Duque de Miranda Chaves Netto,José Luis Mu?ante-Cárdenas,Renato Mazzonetto
International Journal of Morphology , 2009,
Abstract: Los implantes dentales han evolucionado de forma sustancial en los últimos 40 a os; sin embargo, dudas sobre las características de la reparación ósea continúan toda vez que nuevos dise os y nuevos métodos quirúrgicos son aplicados. El objetivo de esta investigación es evidenciar la presencia de tejido mineralizado en diferentes regiones del implante. Se elaboró un estudio basado en un modelo de restauración inmediata, aplicado en la mandíbula de 7 canes machos. Se realizaron las exodontias de los premolares mandibulares y, después de 3 meses de recuperación, se instalaron 2 implantes endóseos bilaterales, siendo uno de tipo cónico y otro de tipo cilindrico. Después de dos periodos de sacrificio se realizo una evaluación histomorfométrica en los cortes seleccionados. Los resultados se presentan de forma porcentual estableciendo comparaciones entre las áreas cervical, media y apical. Los implantes de morfología cónica sometidos al modelo de restauración inmediata, presentaron mayor formación ósea en todos los niveles evaluados. En todas las condiciones de trabajo el área cervical presentó mayor presencia de tejido mineralizado que el área apical. Concluimos que el modelo de restauración inmediata no es un obstáculo para la instalación de la secuencia apropiada de reparación ósea y que diferentes factores deben estar asociados a la mayor formación ósea presente en el área cervical de los implantes dentales. Dental implants have evolved of substantial form in the last 40 years; however, doubt about osseous repair characteristic are maintained because new design and surgical method are applied. The aim of this research is show the mineralized tissue in different areas of the implant. Was done a study based to a immediate load model applied in 7 male dogs mandible. Was realized the dental extractions of de bilateral mandibles bicusp and after to 3 month of recuperations was installed two bilaterally implants, been conical and cylindered shape. After of two sacrifices period was realized a histomorphometric analysis in the selection cut. The results are present with perceptual form, establishing cervical, meddle and apical comparison. Conical implants with immediaterestoration model were present more osseous formations in all evaluated level. For all conditions of work, cervical area presented more mineralized tissue than apical area. We conclude that immediately restoration model it is not an obstacle for the installation of the appropriate sequence for the osseous reparation and that different factors have been associated to the more osseous formation in th
Análisis Histológico del Proceso de Reparación en Defectos óseos: Reconocimiento de Defectos Críticos
Chaves Netto,Henrique Duque de Miranda; Olate,Sergio; Chaves,Maria das Gra?as Alfonso Miranda; Barbosa,José Ricardo de Albergaria; Mazzonetto,Renato;
International Journal of Morphology , 2009, DOI: 10.4067/S0717-95022009000400027
Abstract: surgical procedures involving maxillofacial region frequently require bone grafting to reconstruct the congenital or acquired defects, as well to aesthetic. the bone defect can critical or non-critical. to perform the present studied were used 8 dogs, males. it was performed 2 bicortical defects having 8 mm of diameter on the calvarium of each animal. the cavities were filled up thru the following way: group 1 - blood clot, group 2 - particulate autogenous bone graft. thru the descriptive radiologic and histological analysis, it was observed on 3 weeks period that the group 2 was the only one that presented new bone apposition. on the 6 weeks sacrifice period. the group 2 was the only one that showed advanced resorption stage of the bone grafts particles used for fulfillment being, also the only one that showed periphery of the defects without limit. on this way, it may be conclude that bone defects over 8mm can be considered critical, being necessary some method to help tissue repair, as well as, autogenous bone grafts works well when helping this regeneration process, being indicated to assist bone repair like this performed on this study.
El área Cervical de Implantes Dentales Presenta Mayor Formación ósea que el área Apical en Diferentes Condiciones de Dise?o y Carga: Resultados Preliminares
Olate,Sergio; Chaves Netto,Henrique Duque de Miranda; Mu?ante-Cárdenas,José Luis; Mazzonetto,Renato; Albergaria-Barbosa,José Ricardo de;
International Journal of Morphology , 2009, DOI: 10.4067/S0717-95022009000200016
Abstract: dental implants have evolved of substantial form in the last 40 years; however, doubt about osseous repair characteristic are maintained because new design and surgical method are applied. the aim of this research is show the mineralized tissue in different areas of the implant. was done a study based to a immediate load model applied in 7 male dogs mandible. was realized the dental extractions of de bilateral mandibles bicusp and after to 3 month of recuperations was installed two bilaterally implants, been conical and cylindered shape. after of two sacrifices period was realized a histomorphometric analysis in the selection cut. the results are present with perceptual form, establishing cervical, meddle and apical comparison. conical implants with immediaterestoration model were present more osseous formations in all evaluated level. for all conditions of work, cervical area presented more mineralized tissue than apical area. we conclude that immediately restoration model it is not an obstacle for the installation of the appropriate sequence for the osseous reparation and that different factors have been associated to the more osseous formation in the cervical area of the dental implants.
Análisis fotoelástico descriptivo de dos diferentes dise os de implantes endoóseos sometidos a carga de compresión vertical Descriptive photoelastical analysis of two different dental implants design submitted to vertical compression load
M. Jaimes,H. Duque de Miranda Chaves Netto,S. Olate,R. Mazzonetto
Avances en Periodoncia e Implantología Oral , 2009,
Abstract: El objetivo de este estudio fue analizar la distribución de las tensiones generadas en los modelos fotoelásticos posterior a la aplicación de cargas verticales a 7,5 N, en dos diferentes dise os de implantes endoóseos. Fueron seleccionados 2 implantes con diferentes configuraciones: Implante (Máster Conect C nico 4,13x13 mm) e Implante (Titamax Ti Medula 3,75x13 mm). Para el análisis de la distribución de tensiones fueron confeccionados 2 modelos en resinas fotoelástica con dimensiones de 40x10 mm de base y 30 mm de altura. Cada implante posicionado en los modelos recibieron carga vertical a 7,5 N, siendo posible visualizar las franjas isocromáticas generadas en los modelos, a través del polariscopio. El implante Máster Conect C nico con hexágono interno largo, porción cervical pulida, tope de las roscas redondeadas, pasos de las roscas continuas, distancia entre estas de 0,5 décimas de milímetros, espirales angulados y ápice cónico presento concentración de las tensiones en la región apical. El implante cilíndrico, Titamax Ti Medula , con hexágono externo, porción cervical pulida, con tope de las roscas en forma de v, paso de rosca continuo, con distancia entre las roscas de 0.5 décimas de milímetros, espirales angulados y ápice redondeado presento distribución de las tensiones en la región apical medio y cervical del implante. Basado en los resultados de este estudio puede concluirse que: el implante de configuración cónica concentró las tensiones en región apical, siendo que el implante de configuración cilíndrica concentro las tensiones en la región apical medio y cervical del implante. The objective of this study was to analyze the subsequent tensions distribution generated in the photoelastic models after application 7.5 N vertical loads, in two different dental implant designs. It were selected two different configuration implants, being one conic (Másters Conect C nico 4.13x13 mm) and the other cylindrical (Titamax Ti Medula 3.75x13 mm). For the analysis of the tensions distribution it were made two photoelastic resin models with dimensions of 40×10 mm of base and 30 mm of height. Each implant was positioned in the model and received vertical loads to 7,5 N, being possible to visualize the isochromatic strips generated in it, through the polariscope. The Másters Conect C nico implants, that have long internal hexagon, polished cervical portion, top of spirals rounded, continuous passage of the spirals, distances between these of 0.5 tenth of millimeters, angled spirals and conical apex, presented the concentration of the tensions in the ap
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