Thesis (Ph. D.)--University of Alabama at Birmingham, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1992.

Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains v, 61 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 50-56).

Thesis (M.S.)--West Virginia University, 2010. / Title from document title page. Document formatted into pages; contains vi, 41 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 37-41).

Made available in DSpace on 2014-06-11T19:32:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-09-05Bitstream added on 2014-06-13T21:04:26Z : No. of bitstreams: 1 caneva_m_dr_araca.pdf: 5420643 bytes, checksum: 2a88c9a9a85203bfd0cd8f4fd62affa4 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Objetivo: avaliar a influência da instalação de implantes em alvéolos imediatamente após a extração do elemento dental na regeneração dos tecidos peri-implantares com implantes de diferentes configurações Material e métodos: Nos alvéolos distais dos quartos pré-molares mandibulares de cães, imediatamente após as extrações das raízes dentais, foram instalados implantes cilíndricos com 3,3 mm de diâmetro (grupo controle) e implantes cônicos com 5,0 mm de diâmetro (grupo teste). Foram avaliados histologicamente a regeneração dos tecidos duros e moles peri-implantares após 4 meses do procedimento cirúrgico. Resultados: Todos os implantes apresentaram-se osseointegrados ao tecido ósseo maduro mineralizado. A crista óssea alveolar sofreu reabsorção tanto no grupo teste como controle. A superfície óssea vestibular dos implantes do grupo teste (cônico; 3,6 mm) apresentou maior grau de reabsorção em comparação ao grupo controle (cilíndrico; 1,6 mm). As dimensões dos tecidos moles apresentaram-se semelhantes em ambos os grupos. No entanto, em relação ao ombro do implante, a mucosa peri-implantar localizou-se mais apicalmente no grupo teste em relação ao grupo controle. Conclusão: Este estudo confirmou que a distância entre a superfície do implante e o contorno externo da crista óssea alveolar vestibular influenciou no grau de reabsorção da tábua óssea vestibular. Conseqüentemente, em relação ao ombro do implante, a mucosa peri-implantar será estabelecida em um nível mais apical, se a distância entre a superfície do implante e o contorno externo da crista óssea alveolar for menor / Aim: the aim of the present experiment was to study the influence of implant installation into sockets immediately after tooth extraction on the healing periimplant tissues with implants of various configurations. Material & methods: Transmucosal cylindrical 3.3mm in diameter implants in the control sites, and conical 5.0mm in diameter in the test sites, were installed into the distal socket of the forth mandibular premolars in dogs immediately after tooth extraction. After 4 months, the hard and soft tissue healing was evaluated histologically. Results: All implants were integrated in mineralized mature bone. Both at the test and control sites, the alveolar crest underwent resorption. The buccal bony surface at the implant of the test sites (conical; 3.6mm) was more resorbed compared to the control sites (cylindrical; 1.6mm). The soft tissue dimensions were similar in both groups. However, in relation to the implant shoulder, the periimplant mucosa was located more apically at the test compared to the control sites. Conclusion:The present study confirmed that the distance between the implant surface and the outer contour of the buccal alveolar bony crest influenced the degree of resorption of the buccal bone plate. Consequently, in relation to the implant shoulder, the peri-implant mucosa will be established at a more apical level if the distance between the implant surface and the outer contour of the alveolar crest is small

Made available in DSpace on 2014-06-11T19:28:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2000-04-17Bitstream added on 2014-06-13T20:17:45Z : No. of bitstreams: 1 shibli_ja_me_arafo.pdf: 739694 bytes, checksum: 57c9b17fc168fc0329fc6f5001a03672 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / A microbiota presente na peri-implantite induzida por ligadura, em diferentes superfícies de implantes osseointegrados, foi analisada em 6 cães adultos machos. 36 implantes osseointegrados (9 Ticp: titânio comercialmente puro; 9 TPS: titânio plasma spray; 9 HA: hidroxiapatita; 9 superfícies tratadas com ácidos) foram inseridos e distribuídos igualmente 3 meses após exodontia de todos os pré-molares inferiores. Após um período de 3 meses de osseointegração, os implantes receberam os cicatrizadores. Decorridos 45 dias de cicatrização, amostras peri-implantares foram colhida, utilizando pontas de papel, no período 0 e após a colocação de ligaduras com fio de algodão, nos períodos 20, 40 e 60 dias. A contagem total de microrganismos (CTM) e a proporação de A. actinomycetemcomitans, Bacteroides forsythus, P. gingivalis, P. intermedia, Campylobacter sp, Capnocytophaga sp., Fusobacterium sp., Peptostreptococcus micros, bastonetes anaeróbios Gram-negativos, Streptococcus beta-hemolíticos, Eikenella corrodens e Candida sp. foram analisadas. Não houve diferença da CTM entre as diferentes superfícies (p>0,05). A Pg não foi detectada no tempo 0; nos tempos 20 e 40 foi detectada em 12 implantes (4 Ticp, 4 HA, 2 TPS e 1 Sup. Trat. com ácidos) e no período 60 dias, em 9 (2 Ticp, 3 HA, 2 TPS e 1 Sup. Trat. com ácidos), tendo menor afinidade à superfície tratada com ácidos. Pi foi detectada em 5 implantes (2 Ticp, 2 HA e 1 Sup. Trat. com ácidos) no período 0 e em 100% dos implantes nos demais períodos. Fusobacterium sp. foi detectado em todos os períodos, tendo uma maior afinidade à HA. Streptococcus beta-hemolíticos foi detectado em 6 implantes (3 Ticp, 1 TPS e 2 HA) no período 0 e 30, 26 e 24 implantes respectivamente nos períodos 20, 40 e 60. Campylobacter sp. e Candida sp. foram detectadas em baixas proporções. Os demais microrganismos não... . / The microbiota associated with ligature-induced peri-implantitis, in different dental implants surfaces, was investigated by cultivation on enriched non-selective and various selective solid media, in 6 mongrel dogs. 36 dental implants (9 Ticp: titanium commercially pure; 9 TPS: titanium plasma spray; 9 HA: hidroxiapatite; 9 surfaces acid-etched) were placed in a similar distribution in all dogs 3 months after extraction of all premolars in mandible. Following a healing period of 3 months, healing abutments were installed and 45 days after cotton ligatures were placed and oral-cleaning procedures abolished for 2 months to induce vertical bone loss of about 40%. Microbial samples were with paper points on day of ligature placement and after 20, 40 and 60 days. The total number of cultivable bacteria and proportions of A. actinomycetemcomitans, Bacteroides forsythus, P. gingivalis, P. intermediate, Campylobacter sp., Capnocytophaga sp., Fusobacterium sp., Peptostreptococcus micros, Enteric Gram-negative rods, beta-hemolytic Streptococcus, Eikenella corrodens and Candida sp. were analyzed. No significant microbiological differences were observed among the different surfaces (p>0,05). Pg was not detected in the time 0; already in the times 20 and 40 were detected in 12 dental implants (4 Ticp, 4 HA, 2 TPS and 1 acid-etched surface) and in the period 60 days, in 9(2 Ticp, 3 HA, 2 TPS and 1 acid-etched surface), tends smaller affinity to eh surface with acids-etched surface. Pi was detected in 5 implants (2 Ticp, 2 HA and 1 acid-etched surface) in the period 0 and in 100% of implants in other periods. Fusobacterium sp. was detected in all the periods, tends a larger affinity to HA. Beta-hemolytic Streptococcus was detected in 6 implants (3 Ticp, 1 TPS and 2 HA) in the period 0 and 30, 26 and 24... (Complete abstract, click electronic address below).

Orientador: Jose Ricardo de Albergaria Barbosa / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-11T23:04:29Z (GMT). No. of bitstreams: 1 Perez_MiguelAngelJaimes_M.pdf: 6909101 bytes, checksum: 41413f644c388e8bd46795ab371670ee (MD5) Previous issue date: 2008 / Resumo: Este estudo teve como objetivo analisar a influência do desenho dos implantes endósseos na distribuição de tensões geradas nos modelos fotoelásticos após aplicação de cargas verticais e oblíquas a 7,5N, em quatro marcas comerciais de implantes endósseos. Foram selecionados doze implantes, divididos em quatro grupos: I.) Máster Conect Cônico1 4,3 x 13 mm; II.)Titamax Ti Medular2 3,75 x 13 mm; III.) Colosso3 RC 4,0 x 13mm; IV.) Bicon Uncoated Implant4 3,5 x 11mm, cada grupo contendo 3 implantes da mesma marca comercial. Através da Microscopia Eletrônica de Varredura foi analisado o desenho estrutural dos implantes. Para a análise da distribuição de tensão foram confeccionados oito modelos em resina fotoelástica com dimensões de 40 mm x 10 mm de base e 30 mm de comprimento. Dois implantes para cada grupo foram posicionados e fixados no interior dos modelos fotoelásticos. Uma vez verificada a ausência de tensões nos oito modelos foram iniciados os ensaios. Quatro modelos dos diferentes grupos receberam cargas verticais e quatro receberam cargas oblíquas de 7,5N. Por meio do polariscópio circular pertencente ao laboratório de Materiais Dentários e Prótese da USP-Riberão Preto, foi possível visualizar as franjas de tensões geradas nos modelos. Cada seqüência foi fotografada, sendo mantida a mesma distância focal em todos os ensaios. Os resultados obtidos foram analisados por grupos. O Grupo I, implante de hexágono interno longo com porção cervical polida, topo das roscas arredondadas, passos das roscas contínuas, espirais angulados e configuração cônica, apresentou concentração das tensões na região apical, quando submetida à carga vertical e oblíqua. O Grupo II, implante de hexágono externo, porção cervical polida, topo das roscas em forma de "v", passos das roscas contínuos, espirais anguladas e configuração cilíndrica, apresentou distribuição das tensões na região apical, médio e cervical do implante quando submetida à carga vertical e oblíqua. O Grupo III, implante com hexágono interno, porção cervical polida, topo das roscas em forma cônica, passos das roscas contínuos, espirais anguladas e configuração cilíndrica, apresentou distribuição das tensões nas regiões apical, médio e cervical do implante após aplicação de carga vertical e oblíqua. O Grupo IV, implante com sistema cone morse, ombro cervical inclinado, platô ou barbatanas, topo do platô quadradas, passos do platô descontinuais, e configuração cilíndrica, distribuiu as tensões nas regiões apical, médio e cervical do implante após aplicação de carga vertical e oblíqua. Baseado nos resultados obtidos e dentro da metodologia deste estudo conclui-se que: O grupo I, de configuração cônica concentrou a distribuição das tensões em região apical. Os grupo II, III e IV, de configuração cilíndrica, distribuíram as tensões com intensidade e localização similares nos terços apical médio e cervical. O presente estudo evidenciou haver diferenças na distribuição das cargas de um tipo de implante para outro, levando acreditar que essas diferenças possam ter relação com o desenho das roscas e platô. / Abstract: The meaning of this study was analyze on 4 dental implants brands the influence of its thread design on tensions distribution generated thru photoelastic models, after applying a 7.5N load on vertical and oblique directions. Twelve implants, organized in four groups had been selected: I.) Máster Conect Cônico1 4.3 x 13 mm; II.) Titamax Ti Medular2 3.75 x 13 mm; III.) 4,0 Colosso3 RC x 13mm; IV.) Bicon Uncoated Implant4 3.5 x 11mm, being in each group, three dental implants of the same commercial brand. The structural designs of the implants were analyzed with Electronic Microscopy Sweepings. For the tension distribution analysis, eight models had been confectioned in photoelastic resin with 40mm x 10mm base dimensions and 30 mm of length. Two implants of each group had been located and fixed in the interior of photoelastic models. Once verified the absence of tensions in the eight models the analysis were started. Four models of the different groups had received 7.5N load on vertical and four received this same load on oblique direction. By means of the circular polariscope developed in the Dental Materials and Prostheses laboratory the Ribeirão Preto Dental School (USP/RP), it was possible to visualize the tensions fringes generated in the models. Each sequence was photographed, being kept the same focal distance in all the assays. The gotten results had been analyzed by groups. Group I., implants with long internal hexagon and polishing cervical portion, top of rounded off threads, angled steps of continuous threads, spirals and conical configuration, presented tensions concentration on the apical region, when submitted to the vertical and oblique load. Group II, implants with external hexagon, polishing cervical portion, top of threads in form of v, angled steps of continuous threads, spirals and cylindrical configuration, presented tensions distribution on the apical, medial and cervical regions of the dental implants, when submitted to the vertical and oblique load. Group III., implants with internal hexagon, polishing cervical portion, top of threads in conical form, steps of threads continuous, spirals angled and cylindrical configuration, presented tensions distribution on the apical, medial and cervical regions . Group IV, implants with cone morse system, inclined cervical shoulder, square shaped threads, fin or plateau, angled plateau steps discontinuous, and cylindrical configuration, distributed the tensions on the apical, medial and cervical regions after the application of vertical and oblique loads. Based in the results gotten and respecting the limitations of this study it can be concluding that: Group I. with conical configuration, the tension distributions is concentrated on the apical region. Groups II, III and IV, with cylindrical configuration, had distributed the tensions with similar intensity and localization on the apical, medial and cervical regions. In the present study it is evidenced to have differences in the distribution of loads on the dental implants analyzed, being not evident that these differences have relation with the threads design. / Mestrado / Cirurgia e Traumatologia Buco-Maxilo-Faciais / Mestre em Clínica Odontológica

Magister Scientiae Dentium - MSc(Dent) / This study analyzed the dental surgical implant therapy in the past 5 years at Tygerberg Oral Health Centre, UWC Dental School, Cape Town, South Africa. The findings of this study serve as a guideline for the estimation of the prevalence in this dental hospital. The importance of this study was to aid in the establishment of the formalized electronic database for dental implant therapy. The data generated will form a foundational basis for future studies that may be conducted in the field of implantology.

Magister Scientiae Dentium - MSc(Dent) / Purpose This study analyzed the dental surgical implant therapy in the past 5 years at Tygerberg Oral Health Centre, UWC Dental School, Cape Town, South Africa. The findings of this study serve as a guideline for the estimation of the prevalence in this dental hospital. The importance of this study was to aid in the establishment of the formalized electronic database for dental implant therapy. The data generated will form a foundational basis for future studies that may be conducted in the field of implantology. Methodology A retrospective cross-sectional study was conducted at the Tygerberg Oral Health Centre. The data was collected from the implant dental records for the years 2012-2017. Variables measured included the patient demographics such as age, gender, an implant placed by type, length, width, and anatomical location. Frequencies and means of data were generated using IBM SPSS v20.

MDent, Faculty of Health Sciences, University of the Witwatersrand / PURPOSE The purpose of this in vitro investigation was to determine the effect of using either gold or titanium retaining screws on preload in the dental implant body-abutment complex. This preload is of vital importance for the long term success of the dental implant complex. Inadequate preload results in either loosening or fracture of the retaining screw, and is the most commonly occurring mechanical complication in implant supported/retained prostheses. Similar complications occur when excessive preload is applied to the retaining screws. These complications can result in unscheduled visits with costly and time consuming repairs for the clinician and patient. Routine maintenance protocols for implant supported prostheses range from biannually to five year visits to the dentist. Maintenance visits involve removal of the prosthesis facilitating cleaning of both the implant and prosthesis and inspection of retaining screws . This study sought to gain insight into changes in preload generation after repeated torque application to gold and titanium screws and to observe whether gold or titanium generated better preload. A maintenance protocol would be suggested if any observable pattern was noted. MATERIALS AND METHODS The test setup consisted of an implant body, a cylindrical transmucosal abutment and the retaining screws (gold or titanium). The implant body was anchored using a load cell. Transmucosal abutments were attached to the implant body using either a gold or titanium v retaining screw. A torque gauge was used to apply torque of 20Ncm, 32Ncm and 40Ncm to the retaining screws. This was undertaken to investigate the effect of gold or titanium on preload generated. The effect of applying torque beyond manufacturers recommended 32Ncm was carried out to see if greater preloads could be achieved. All components were from the Southern Implant system. RESULTS Gold retaining screws were found to achieve consistently higher preload values than titanium retaining screws. Preload values were not significantly different from the first to the tenth torque cycle. Titanium screws showed more consistent preload values, albeit lower than those of gold retaining screws. However due to possible galling of the internal thread of the implant body by titanium screws, gold screws remain the retaining screw of choice. Maintenance protocols suggest replacing retaining screws every 20 years. After ten torque cycles were applied to each screw there was an insignificant change in preload generated in both titanium and gold screws. This study was therefore inconclusive with regards to maintenance protocols. CONCLUSION Within the limitations of this study, gold retaining screws generated better preload than titanium. Torque application beyond manufacturers’ recommendations resulted in a more stable implant complex. Further investigation into repeated torque application to retaining screws is required, to determine ideal maintenance protocols.