The purpose of this study was to verify through mechanical tests of push out the strength adhesiv... more The purpose of this study was to verify through mechanical tests of push out the strength adhesive bonding between the intra-root teeth of cattle and pins of carbon fiber (Reforpost/Angelus) and if there was any difference between the cervical, and apical average, using two adhesive systems (Variolink II/Ivoclar and Cement Post/Angelus). Twelve uni-root teeth were selected, randomly divided into two groups: Group 1 (Variolink II), Group 2 (Cement Post). The roots were split across three discs of 2.0mm in thickness, called cervical thirds, middle and apical. Through analysis of variance (Anova p = 0,224) there was no statistically significant difference between the thirds.
Manipulation of implant surface characteristics constitutes a promising strategy for improving ce... more Manipulation of implant surface characteristics constitutes a promising strategy for improving cell growth and tissue response on a variety of materials with different surface topographies. Mesenchymal progenitor cells with a capacity to respond to titanium surface stimuli and differentiate into osteoblasts were used to perform comparative tests between two different implant topographies, including their functional interaction with pre-osteoblasts directly seeded onto the implants. Functional analysis of nanostructured implant surfaces was performed by in vitro assay analysis. The machined surface of titanium implants (mach group) was used as a control and compared with a nanoparticle HA activated surface implant (nano group), developed by the deposition of pure crystalline hydroxyapatite. Cell culture on the nano group surface resulted in higher cell adhesion and cultured osteoblast viability compared with the mach group. Scanning electron microscope (SEM) images revealed a stable ...
O estudo objetivou identificar os fatores favorecedores e os comprometedores da qualidade do ensi... more O estudo objetivou identificar os fatores favorecedores e os comprometedores da qualidade do ensino do curso de graduação em Odontologia da Universidade Federal Fluminense. Trata-se de uma pesquisa exploratória realizada em duas etapas distintas, porém com enfoque integrado. As percepções dos professores e dos alunos foram coletadas por meio de questionários. Para a análise dos dados utilizou-se a Análise de Conteúdo, a estatística descritiva e inferencial. Verificou-se que, na visão acadêmica dos segmentos estudados, o principal fator favorecedor foi qualidade do corpo docente e comprometimento. Já em relação aos comprometedores foram apontados como principais: falta de componentes tais como: competência, motivação, assiduidade, comprometimento e comportamento democrático, por parte de alguns professores; falta de integração e interdisciplinaridade entre as disciplinas; programas curriculares tradicionais, antigos e deficientes. PALAVRAS-CHAVE: Ensino de Odontologia. Qualidade do e...
This study measured the maximum angulation between 2 implants allowed by the internal walls of th... more This study measured the maximum angulation between 2 implants allowed by the internal walls of the component in screw-retained multiple prostheses using rotational abutment-type components. Thirty specimens of 3 different brands (Conexão; Neodent; and SIN), consisting of titanium rotational abutments connected to external hexagon abutment analogs with standard platforms, were divided into 3 groups. The specimens were internally filled with polyester resin, screw retained, torque, and sectioned to assess the space existing between the internal wall of the rotational abutment component, edge, and vertex of the hexagon. The measurements were performed using 3-dimensional equipment. When the implant hexagons were oriented edge-to-edge, groups 1, 2, and 3 presented 40.75, 45.00, and 31.89 degrees, respectively. Vertex-to-vertex hexagon orientation showed 9.79, 18.18, and 3.27 degrees for groups 1, 2, and 3, respectively. The maximum mean angulation in the mesio/distal direction between the 2 implants with hexagon-oriented vertex-to-vertex is 10.41 degrees, and hexagon-oriented edge-to-edge is 39.54 degrees. This study suggests guidelines for positioning external hexagon implants for interference-free screw-retained multiple prostheses using rotational abutment-type components.
Wolters Kluwer Health may email you for journal alerts and information, but is committed to maint... more Wolters Kluwer Health may email you for journal alerts and information, but is committed to maintaining your privacy and will not share your personal information without your express consent. For more information, please refer to our Privacy Policy. ... Skip Navigation Links Home > ...
Objective : To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and th... more Objective : To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and the BMP4 gene (rs17563) with nonsyndromic oral clefts. Design : A hospital-based case-control study was conducted with nonsyndromic oral clefts cases and unaffected controls. Cleft type and tooth agenesis data were collected by clinical examination and confirmed through medical records. Risk factors were obtained through a questionnaire. Genotyping of the selected polymorphisms for TGFB3 and BMP4 were carried out by real-time polymerase chain reaction using the Taqman assay method from a genomic DNA isolated from buccal epithelial cells of all individuals. Setting : The case group was ascertained through a public reference hospital of oral cleft rehabilitation in Rio de Janeiro, Brazil. The noncleft group consisted of unrelated subjects, with no history of oral cleft in the family, recruited at the Dental Clinic at the Federal University of Rio de Janeiro, Brazil. Participants : A total of 833 unrelated individuals (450 control individuals and 383 cases with nonsyndromic oral clefts). Results : No significant association in relation to genotype or allele distributions for TGFB3 polymorphism was found between oral cleft subgroups and the control group. For BMP4, there were significant differences in the genotype frequencies between the oral cleft and control groups (P = .0007). Regarding cleft type, there were statistically significant differences between the cleft lip and control groups (P = .00009). Conclusion : Our findings provide preliminary evidence suggesting that the risk of nonsyndromic oral clefts may be influenced by variation in the BMP4 gene.
To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and the BMP4 gene ... more To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and the BMP4 gene (rs17563) with isolated human tooth agenesis. One hundred and seventy-five unrelated individuals (125 control individuals without tooth agenesis and 50 cases with tooth agenesis) were evaluated using a case-control design. The participants of the study were recruited through the Dental School of the Federal University of Rio de Janeiro, Brazil. Genotyping of the selected polymorphisms for TGFB3 (48 individuals with tooth agenesis and 125 control cases) and BMP4 (46 individuals with tooth agenesis and 88 control cases) were carried out by real-time PCR using the Taqman assay method from a genomic DNA isolated from buccal epithelial cells of all individuals. Significant statistical differences were found for genotype frequencies between tooth agenesis and TGFB3 control samples (p = 0.026). In addition, significant differences were also observed for allele and genotype frequencies between unilateral tooth agenesis and TGFB3 control samples (p = 0.014 and 0.004 for allele and genotype frequencies, respectively). For BMP4, genotype distribution had a statistically significant difference between groups (p = 0.047). The GG genotype of BMP4 was more frequent in individuals with three or more missing teeth than in the control group (p < 0.0001). These results indicate that polymorphisms in the TGFB3 gene and in BMP4 genes contribute to tooth agenesis. Nonetheless, the extents to which this polymorphism may actually contribute to the tooth agenesis status should be clarified.
To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626), and the BMP4 gene... more To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626), and the BMP4 gene (rs17563) with dental caries in two different groups (noncleft group and oral cleft group) from a cleft center located at Rio de Janeiro, Brazil. A total of 486 unrelated children and adolescents with or without caries were evaluated using a cohort design. Data on oral health habits was obtained through a questionnaire and caries data was collected by clinical examination. Genotyping of the selected polymorphisms for TGFB3 and BMP4 were carried out by real-time PCR using the TaqMan assay method from a genomic DNA isolated from buccal epithelial cells of all children and adolescents. No association was found between BMP4 polymorphism and caries among individuals from both groups. For TGFB3 polymorphism, significant differences were observed for allele and genotype frequencies between caries free and caries affected individuals in oral cleft group (p = 0.013 and 0.006 for allele and genot...
The purpose of this study was to verify through mechanical tests of push out the strength adhesiv... more The purpose of this study was to verify through mechanical tests of push out the strength adhesive bonding between the intra-root teeth of cattle and pins of carbon fiber (Reforpost/Angelus) and if there was any difference between the cervical, and apical average, using two adhesive systems (Variolink II/Ivoclar and Cement Post/Angelus). Twelve uni-root teeth were selected, randomly divided into two groups: Group 1 (Variolink II), Group 2 (Cement Post). The roots were split across three discs of 2.0mm in thickness, called cervical thirds, middle and apical. Through analysis of variance (Anova p = 0,224) there was no statistically significant difference between the thirds.
Manipulation of implant surface characteristics constitutes a promising strategy for improving ce... more Manipulation of implant surface characteristics constitutes a promising strategy for improving cell growth and tissue response on a variety of materials with different surface topographies. Mesenchymal progenitor cells with a capacity to respond to titanium surface stimuli and differentiate into osteoblasts were used to perform comparative tests between two different implant topographies, including their functional interaction with pre-osteoblasts directly seeded onto the implants. Functional analysis of nanostructured implant surfaces was performed by in vitro assay analysis. The machined surface of titanium implants (mach group) was used as a control and compared with a nanoparticle HA activated surface implant (nano group), developed by the deposition of pure crystalline hydroxyapatite. Cell culture on the nano group surface resulted in higher cell adhesion and cultured osteoblast viability compared with the mach group. Scanning electron microscope (SEM) images revealed a stable ...
O estudo objetivou identificar os fatores favorecedores e os comprometedores da qualidade do ensi... more O estudo objetivou identificar os fatores favorecedores e os comprometedores da qualidade do ensino do curso de graduação em Odontologia da Universidade Federal Fluminense. Trata-se de uma pesquisa exploratória realizada em duas etapas distintas, porém com enfoque integrado. As percepções dos professores e dos alunos foram coletadas por meio de questionários. Para a análise dos dados utilizou-se a Análise de Conteúdo, a estatística descritiva e inferencial. Verificou-se que, na visão acadêmica dos segmentos estudados, o principal fator favorecedor foi qualidade do corpo docente e comprometimento. Já em relação aos comprometedores foram apontados como principais: falta de componentes tais como: competência, motivação, assiduidade, comprometimento e comportamento democrático, por parte de alguns professores; falta de integração e interdisciplinaridade entre as disciplinas; programas curriculares tradicionais, antigos e deficientes. PALAVRAS-CHAVE: Ensino de Odontologia. Qualidade do e...
This study measured the maximum angulation between 2 implants allowed by the internal walls of th... more This study measured the maximum angulation between 2 implants allowed by the internal walls of the component in screw-retained multiple prostheses using rotational abutment-type components. Thirty specimens of 3 different brands (Conexão; Neodent; and SIN), consisting of titanium rotational abutments connected to external hexagon abutment analogs with standard platforms, were divided into 3 groups. The specimens were internally filled with polyester resin, screw retained, torque, and sectioned to assess the space existing between the internal wall of the rotational abutment component, edge, and vertex of the hexagon. The measurements were performed using 3-dimensional equipment. When the implant hexagons were oriented edge-to-edge, groups 1, 2, and 3 presented 40.75, 45.00, and 31.89 degrees, respectively. Vertex-to-vertex hexagon orientation showed 9.79, 18.18, and 3.27 degrees for groups 1, 2, and 3, respectively. The maximum mean angulation in the mesio/distal direction between the 2 implants with hexagon-oriented vertex-to-vertex is 10.41 degrees, and hexagon-oriented edge-to-edge is 39.54 degrees. This study suggests guidelines for positioning external hexagon implants for interference-free screw-retained multiple prostheses using rotational abutment-type components.
Wolters Kluwer Health may email you for journal alerts and information, but is committed to maint... more Wolters Kluwer Health may email you for journal alerts and information, but is committed to maintaining your privacy and will not share your personal information without your express consent. For more information, please refer to our Privacy Policy. ... Skip Navigation Links Home > ...
Objective : To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and th... more Objective : To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and the BMP4 gene (rs17563) with nonsyndromic oral clefts. Design : A hospital-based case-control study was conducted with nonsyndromic oral clefts cases and unaffected controls. Cleft type and tooth agenesis data were collected by clinical examination and confirmed through medical records. Risk factors were obtained through a questionnaire. Genotyping of the selected polymorphisms for TGFB3 and BMP4 were carried out by real-time polymerase chain reaction using the Taqman assay method from a genomic DNA isolated from buccal epithelial cells of all individuals. Setting : The case group was ascertained through a public reference hospital of oral cleft rehabilitation in Rio de Janeiro, Brazil. The noncleft group consisted of unrelated subjects, with no history of oral cleft in the family, recruited at the Dental Clinic at the Federal University of Rio de Janeiro, Brazil. Participants : A total of 833 unrelated individuals (450 control individuals and 383 cases with nonsyndromic oral clefts). Results : No significant association in relation to genotype or allele distributions for TGFB3 polymorphism was found between oral cleft subgroups and the control group. For BMP4, there were significant differences in the genotype frequencies between the oral cleft and control groups (P = .0007). Regarding cleft type, there were statistically significant differences between the cleft lip and control groups (P = .00009). Conclusion : Our findings provide preliminary evidence suggesting that the risk of nonsyndromic oral clefts may be influenced by variation in the BMP4 gene.
To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and the BMP4 gene ... more To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626) and the BMP4 gene (rs17563) with isolated human tooth agenesis. One hundred and seventy-five unrelated individuals (125 control individuals without tooth agenesis and 50 cases with tooth agenesis) were evaluated using a case-control design. The participants of the study were recruited through the Dental School of the Federal University of Rio de Janeiro, Brazil. Genotyping of the selected polymorphisms for TGFB3 (48 individuals with tooth agenesis and 125 control cases) and BMP4 (46 individuals with tooth agenesis and 88 control cases) were carried out by real-time PCR using the Taqman assay method from a genomic DNA isolated from buccal epithelial cells of all individuals. Significant statistical differences were found for genotype frequencies between tooth agenesis and TGFB3 control samples (p = 0.026). In addition, significant differences were also observed for allele and genotype frequencies between unilateral tooth agenesis and TGFB3 control samples (p = 0.014 and 0.004 for allele and genotype frequencies, respectively). For BMP4, genotype distribution had a statistically significant difference between groups (p = 0.047). The GG genotype of BMP4 was more frequent in individuals with three or more missing teeth than in the control group (p < 0.0001). These results indicate that polymorphisms in the TGFB3 gene and in BMP4 genes contribute to tooth agenesis. Nonetheless, the extents to which this polymorphism may actually contribute to the tooth agenesis status should be clarified.
To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626), and the BMP4 gene... more To evaluate the association of the polymorphisms in the TGFB3 gene (rs2268626), and the BMP4 gene (rs17563) with dental caries in two different groups (noncleft group and oral cleft group) from a cleft center located at Rio de Janeiro, Brazil. A total of 486 unrelated children and adolescents with or without caries were evaluated using a cohort design. Data on oral health habits was obtained through a questionnaire and caries data was collected by clinical examination. Genotyping of the selected polymorphisms for TGFB3 and BMP4 were carried out by real-time PCR using the TaqMan assay method from a genomic DNA isolated from buccal epithelial cells of all children and adolescents. No association was found between BMP4 polymorphism and caries among individuals from both groups. For TGFB3 polymorphism, significant differences were observed for allele and genotype frequencies between caries free and caries affected individuals in oral cleft group (p = 0.013 and 0.006 for allele and genot...
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Papers by Cresus Vinicius Depes Gouvêa