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Search Results: 1 - 10 of 5619 matches for " Mazzonetto Renato "
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Estudo químico, macroscópico e da resistência à flex?o de placas e parafusos de titanio usados na fixa??o interna rígida
TRIVELLATO, Alexandre Elias;MAZZONETTO, Renato;PASSERI, Luis Augusto;CONSANI, Simonides;
Pesquisa Odontológica Brasileira , 2000, DOI: 10.1590/S1517-74912000000400015
Abstract: the aim of this study was to compare four systems of titanium plates and screws (diameter of 2.0 mm) used for internal rigid fixation. from them, two were made in brazil (engimplan and bucomax), one in switzerland (synthes), and the other, in germany (w. lorenz). the following analyses were done: chemical analysis using energy dispersive spectroscopy (eds) and atomic emission spectroscopy (aes), measurement of dimensions and bending resistance test. the obtained results allow to conclude that both brazilian systems showed inferior behavior regarding dimensional standards. the bending assay showed that the brazilian systems are similar to each other. however, the w. lorenz screws are made of titanium-6aluminum-4vanadium alloy, which can be the reason for their better performance in the bending assay, when compared with that of the other three systems. the remaining plates and screws are made of commercially pure titanium as confirmed by eds and aes.
Evaluation of the bending strength of rigid internal fixation with absorbable and metallic screws in mandibular ramus sagittal split osteotomy: in vitro study
Gomes, Petrus Pereira;Guimar?es Filho, Rubens;Mazzonetto, Renato;
Pesquisa Odontológica Brasileira , 2003, DOI: 10.1590/S1517-74912003000300012
Abstract: the aim of this study was to evaluate, in vitro, the bending strength of internal fixation with absorbable and metallic screws in mandibular ramus sagittal split osteotomy in sheep hemimandibles. the screws were inserted as lag screws, with an inverted "l" configuration, and the set was submitted to bending strength tests. the load and displacement of the peak and final load averages were, respectively, 18.45 kgf, 8.19 mm and 14.38 kgf for group i, and 16.67 kgf, 6.73 mm and 13.98 kgf for group ii. the results were submitted to statistical analysis by student?s t test and by the pearson correlation analysis. the groups showed no statistically significant differences, indicating the feasibility of both for osteosynthesis in mandibular ramus sagittal split osteotomies.
Estudo químico, macroscópico e da resistência à flex o de placas e parafusos de titanio usados na fixa o interna rígida
TRIVELLATO Alexandre Elias,MAZZONETTO Renato,PASSERI Luis Augusto,CONSANI Simonides
Pesquisa Odontológica Brasileira , 2000,
Abstract: O objetivo deste estudo foi comparar quatro sistemas de placas e parafusos de titanio de 2,0 mm de diametro utilizados em fixa o interna rígida, sendo duas marcas nacionais (Engimplan e Bucomax) e duas importadas (Synthes e W. Lorenz). Foram realizadas as seguintes análises: composi o química, através de espectrometria por dispers o de energia (EDS) e espectrometria de emiss o at mica (AES), macroscópica, por meio de medidas padronizadas e de resistência à flex o. Os resultados obtidos permitem concluir que as marcas nacionais apresentaram um comportamento inferior, em rela o a padroniza o das dimens es das placas e parafusos avaliados, influenciando nos resultados dos testes de flex o, para os quais estas se comportaram da mesma maneira. Entretanto, a marca comercial W. Lorenz utiliza liga de titanio-6alumínio-4vanádio para a confec o dos parafusos, fato responsável pelo melhor resultado no teste de flex o que qualquer outra marca. Os demais parafusos e placas apresentaram-se constituídos de titanio comercialmente puro, de acordo com a EDS e posteriormente confirmados pela AES.
Evaluation of the bending strength of rigid internal fixation with absorbable and metallic screws in mandibular ramus sagittal split osteotomy: in vitro study
Gomes Petrus Pereira,Guimar?es Filho Rubens,Mazzonetto Renato
Pesquisa Odontológica Brasileira , 2003,
Abstract: The aim of this study was to evaluate, in vitro, the bending strength of internal fixation with absorbable and metallic screws in mandibular ramus sagittal split osteotomy in sheep hemimandibles. The screws were inserted as lag screws, with an inverted "L" configuration, and the set was submitted to bending strength tests. The load and displacement of the peak and final load averages were, respectively, 18.45 kgf, 8.19 mm and 14.38 kgf for Group I, and 16.67 kgf, 6.73 mm and 13.98 kgf for Group II. The results were submitted to statistical analysis by Student?s t test and by the Pearson correlation analysis. The groups showed no statistically significant differences, indicating the feasibility of both for osteosynthesis in mandibular ramus sagittal split osteotomies.
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.
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.
Distracción osteogénica alveolar por medio de dispositivos yuxtaoseos: Revisión de literatura y reporte de caso
Maurette,Paul E; de Maurette,Marvis Allais; Mazzonetto, Msc, PhD,Renato;
Acta Odontológica Venezolana , 2005,
Abstract: abstract: the reconstruction of atrophic alveolar ridges by means of the technique of alveolar distraction osteogenesis (ado) offers a foregone result with small morbidity rates and a remarkable gain of bony and soft tissues, in comparison with the traditionally used techniques. a masculine patient of 21 years old who presented a severe atrophy of alveolar ridge in the region anterior of the maxillary was assisted by means of ado, using a juxtaosseous device (connection implant system? - sp-brazil), beginning the activation from the device to the 7 days later to the installation, with a pattern of activation 1 mm. per day until reaching the wanted bony height, being carried out the retirement of the distractor and the placement of the implants 10 weeks later. it could be proven clinic and radiographic the gain of the height and necessary bony volume for the rehabilitation by implants
Patient?s perception of the events during and after Osteogenic Alveolar Distraction
Allais,Marvis; Maurette,Paul Edward; Mazzonetto,Renato; Rodrigues Laureano Filho,Jose;
Medicina Oral, Patología Oral y Cirugía Bucal (Internet) , 2007,
Abstract: objective: the aim of the study was to evaluate the patient?s perception of the events during and after an osteogenic alveolar distraction (oad) procedure materials and methods: a total of fifty-five (55) osteogenic alveolar distraction (oad) procedures were performed in fifty (50) patients, who then were asked to answer ten (10) questions related to the treatment. six (6) questions made reference to predefined values in a visual analogical scale (vas), three (3) questions could be answered by a predetermined answer, and only one (1) question had a free answer. results: in 76% of cases, the patient?s description of the sensation felt during the surgery was good and bearable; 84% of the patients didn?t feel pain after surgery. 4% of the patients felt pain during the activation period and 58% of the patients described the sensation during the activation period as pressure, felt most commonly, at the end of the period, and for about 20 minutes (66.6 %). in these cases the most frequently used analgesic was paracetamol. also, 46% expressed having had some difficulty to activate the device, with 10% of them in need of extra help. the presence of the activation rod caused discomfort in 52%. finally, 78% of the patients treated with oad would undergo this procedure again if it was necessary. a bone graft was performed in 27 out of the 50 treated patients, with 70% of them describing the bone graft surgery as more painful than the oad. conclusion: the oad technique had a high degree of acceptance among the treated patients, however, some details as the interference of the activation rod continue to disturb them. the acceptance of the oad technique is much better when compared with bone graft surgery technique as a second treatment.
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
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
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