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Search Results: 1 - 10 of 13903 matches for " Renato; Albergaria-Barbosa "
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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
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.
Septum en Seno Maxilar: Un Estudio de 91 Cirugías Consecutivas de Elevación de Piso Sinusal
Olate,Sergio; Pozzer,Leandro; Luna,Aníbal Henrique Barbosa; Moraes,Marcio de; Mazzonetto,Renato; Moreira,Roger W. Fernandes; Albergaria-Barbosa,Jose Ricardo de;
International Journal of Morphology , 2011, DOI: 10.4067/S0717-95022011000400025
Abstract: sinus lift has been widely studied and is highly successful. the aim of this research was to establish the prevalence of intrasinusal septum in consecutive surgeries for maxillary sinus floor elevation and identify the relation with sinus membrane rupture. ninety one surgeries were realized in patients with an indication for dental implant installation in the posterior maxilla; the patient with complete clinical and medical record (card, radiography, etc.) and without contraindications for the procedure was included in the study; the surgery was realized with local or general anesthesia and the material used for inlay graft was autogenous bone or biometarials. the septum was identified by panoramic image in the preoperatory and clinically at the time of surgery; any complication was studied and related to intrasinusal septum; the statistical study was carried out with fisher test with p value <0.05. surgery was performed on 72 subjects (53 female and 19 male) with a mean age of 44.5 years of age; in 74.7% of patients no complications were observed, while 18.7% presented sinusal membrane rupture. the septum was observed in 18.7% (16 maxillary sinus), showing 12 septum in anterior position and 4 in posterior position; the presence of septum was positively related to membrane rupture (p<0.05). finally, we can state that the intrasinusal septum was observed in 17% and was related to intraoperatory complications as membrane rupture.
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.
Consideraciones actuales en hiperplasia fibrosa inflamatoria
Mu?ante-Cárdenas,Jose luis; Miguel,Jaimes; Sergio,Olate; Albergaria-Barbosa,José Ricardo;
Acta Odontológica Venezolana , 2009,
Abstract: the objective of this research is an evaluate of clinical and histologic aspects of fibrous inflammatory hyperplasia and the possibilities of its treatment. this lesion is frequently originated for using total or partial prosthesis which are inadequate adapted generating a chronic traumatism of low intensity. clinical cases in jaw and maxila have been reported, not existing predilection for any dental arches. small lesions can be treated by the conservative way that means removing the causal agent or atrophying by putting pressure with a new prosthesis, whereas extensive lesions of large evolution need surgical excision. if the surgical treatment is considered, this should include the total removal of the lesion, using varieties of techniques such as ?cold? scalpel, laser or electrosurgical techniques. the surgical removal is necessary because recover the normal contour of tissue and the prosthetic adaptation. reports exist about dysplasic alterations related to fibrous inflammatory hyperplasia, but the possibility of a malignant transformation is actually controversial.
Análisis microestructural de cinco sistemas de implantes de titanio comercialmente puro
Olate,S.; Duque de Miranda Chaves Netto,H.; Albergaria-Barbosa,J.R. de;
Avances en Periodoncia e Implantología Oral , 2010, DOI: 10.4321/S1699-65852010000100005
Abstract: nowadays there is a great number of manufacturers and types of implants which has led to several techniques in their production, not always associated with better quality. the aim of this research was identify and typify five commercially pure titanium implant systems. a double-blind, descriptive trial was used with the selection of 15 samples from 5 different manufacturers. each implant was removed from its package keeping its original characteristics. five implant groups of 3 elements each were formed and named a, b, c, d, and e. the analyses included metallography, scanning electron microscopy with a microanalysis system (sem-eds) and, finally, an image analyzer. implamed? and master screw? showed smaller grain sizes. in micrographies, they all showed peaks of titanium, carbon, and oxygen. implamed? showed iron, sodium, magnesium, silicon, potassium, and calcium inclusions. all samples showed good finishing. variations observed would not be enough to interfere with osseointegration but metal inclusions should be studied in greater detail in order to assess its effects in the long run.
Consideraciones actuales en hiperplasia fibrosa inflamatoria Current considerations in inflammatory fibrous hyperplasia
Jose luis Mu?ante-Cárdenas,Jaimes Miguel,Olate Sergio,José Ricardo Albergaria-Barbosa
Acta Odontológica Venezolana , 2009,
Abstract: El objetivo de esta investigación es evaluar los aspectos clínicos, histológicos y las posibilidades de tratamiento de la hiperplasia fibrosa inflamatoria (HFI). Esta lesión se origina frecuentemente a partir de prótesis totales o parcial mal adaptadas, las cuales generan un traumatismo crónico de baja intensidad. Se han descrito lesiones en mandíbula y maxila, no existiendo predilección por ninguna de las arcadas dentales. Lesiones peque as pueden ser tratadas de manera conservadora, con remoción del agente causal o mediante atrofia por presión con nuevas prótesis, mientras que lesiones extensas y de larga evolución necesitarán de escisión quirúrgica. Si el tratamiento quirúrgico es considerado, éste debe incluir la remoción total de la lesión, usando diversas técnicas como bisturí “frío” (lámina), láser o electrocirugía.La remoción quirúrgica es necesaria, pues restaura el contorno normal del tejido y la adaptación protética. Algunos autores han reportado alteraciones displásicas en la HFI, pero la posibilidad de que ésta sufra una transformación maligna aún es muy discutida. The objective of this research is an evaluate of clinical and histologic aspects of fibrous inflammatory hyperplasia and the possibilities of its treatment. This lesion is frequently originated for using total or partial prosthesis which are inadequate adapted generating a chronic traumatism of low intensity. Clinical cases in jaw and maxila have been reported, not existing predilection for any dental arches. Small lesions can be treated by the conservative way that means removing the causal agent or atrophying by putting pressure with a new prosthesis, whereas extensive lesions of large evolution need surgical excision. If the surgical treatment is considered, this should include the total removal of the lesion, using varieties of techniques such as “cold” scalpel, laser or electrosurgical techniques. The surgical removal is necessary because recover the normal contour of tissue and the prosthetic adaptation. reports exist about dysplasic alterations related to fibrous inflammatory hyperplasia, but the possibility of a malignant transformation is actually controversial.
Análisis microestructural de cinco sistemas de implantes de titanio comercialmente puro Microstructural analysis of five commercially pure titanium implant systems
S. Olate,H. Duque de Miranda Chaves Netto,J.R. de Albergaria-Barbosa
Avances en Periodoncia e Implantología Oral , 2010,
Abstract: Hoy en día existe un gran número de empresas fabricantes de implantes así como diferentes tipos de implantes, lo que ha llevado a la diversificación en las técnicas de producción, no siempre asociados a una mejor calidad. El objetivo de este estudio fue identificar y tipificar cinco implantes de titanio comercialmente puro. Se utilizó un estudio descriptivo, doble ciego, para estudiar 15 muestras de implantes de 5 empresas comerciales. Cada implante fue removido de su transporte manteniendo sus características originales. Cada grupo fue de cinco implantes, nombrados con las letras A, B, C, D y E. el análisis incluyó metalografia, microscopia electrónica con sistema de microanálisis (SEM-EDS) y finalmente, un analizador de imágenes. Implamed y Master Screw mostraron granos de menor tama o. En microfotografías, todos exhibieron picos de titanio, carbono y oxígeno. Implamed mostró también acero, sodio, magnesio, silicona, potasio e inclusiones de calcio. Todas las muestras mostraron buena finalización. Las variaciones observadas no serían suficientes para interferir en el proceso de oseointegración, no obstante las inclusiones de metal deben ser estudiadas detalladamente en sus efectos a largo plazo. Nowadays there is a great number of manufacturers and types of implants which has led to several techniques in their production, not always associated with better quality. The aim of this research was identify and typify five commercially pure titanium implant systems. A double-blind, descriptive trial was used with the selection of 15 samples from 5 different manufacturers. Each implant was removed from its package keeping its original characteristics. Five implant groups of 3 elements each were formed and named A, B, C, D, and E. The analyses included metallography, scanning electron microscopy with a microanalysis system (SEM-EDS) and, finally, an image analyzer. Implamed and Master Screw showed smaller grain sizes. In micrographies, they all showed peaks of titanium, carbon, and oxygen. Implamed showed iron, sodium, magnesium, silicon, potassium, and calcium inclusions. All samples showed good finishing. Variations observed would not be enough to interfere with osseointegration but metal inclusions should be studied in greater detail in order to assess its effects in the long run.
Tratamiento quirúrgico de Fracturas mandibulares en pacientes pediátricos: Revisión Bibliográfica
Mu?ante-Cárdenas,José; Olate,Sergio; Jaimes,Miguel; Gonzales del Castillo,Erick; De Albergaria-Barbosa,José Ricardo;
Acta Odontológica Venezolana , 2009,
Abstract: the facial fractures in children show important characteristics about their prevalence, diagnosis and treatment, which differentiate them from fractures in adults. for these reasons, children trauma should be a subject of special attention to due the anatomical, physiological and psychological considerations of the patient′s age. the children jaw fractures that show little displacements can be treat in a conservative way, while those that show greater displacements and interfering with the function should be treated similarly to that in adults, this is with open reduction and stabilization, using some devices such as plaques, steel wires, screws and titanium plaques or through resorbable osteosynthesis systems. these different systems show indications, advantages and disadvantages, which must be considered in order to choose the most suitable treatment
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