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Previous issue date: 2014-03-31 / Previous biomechanical studies show a great stress concentration at the distal region of implants adjacent to the cantilever in fixed implant-supported complete dentures (FISCD). Thus, it is necessary to evaluate the marginal bone levels in this region by means of intraoral radiographs. The objectives of this study were: 1) to develop a specific methodological approach for the radiographic evaluation of marginal bone loss (MBL) around the most distal implants adjacent to prosthetic cantilever in FISCD, 2) to investigate possible correlation between MBL, cantilever extension and mesio-distal inclination of the distal implants. Seven patients with 10 FICSD (n=20 implants) were accompanied during one year at the clinics of Faculty of Dentistry of PUCRS. Measurements of the cantilever extension of the metallic infrastructures were carried out during the prosthetic rehabilitation. The mesio-distal inclinations of the implants relative to the occlusal plane were defined through the cone beam computer tomography (CBCT). Intra-oral digital radiographs were obtained by customized positioning devices following delivery of the prostheses (baseline) and one year after the delivery. Cantilever extension, inclination and MBL of the distal implants were analyzed descriptively and inferentially: the correlation between MBL, cantilever extension and inclination of the implants were evaluated by Spearman‟s correlation coefficient with significance level of 5%. The mean values and their variability were; cantilever extension 9,80? 3,69 mm, distal inclination 2,50 (1,00; 10,50) degrees, mesial inclination -3,00(-5,00; -1,00) degrees, mesial MBL -0,08 (-0,28; 0,05) mm and distal MBL -0,04(-0,35; 0,09) mm. No statistical correlation was detected neither between MBL and cantilever extension nor between MBL and inclination of the distal implants. The proposed radiographic and methodological technique used in this study was reliable and reproducible. The findings of MBL after 1 year of follow-up were in accordance with the literature. / Estudos biomec?nicos anteriores mostram que h? uma maior concentra??o de for?as na regi?o distal dos implantes adjacentes ao cantilever prot?tico em Pr?teses Totais Fixas Implantossuportadas (PTFIs), o que leva ? necessidade de avalia??o ?ssea periimplantar nessa regi?o com radiografias intra-orais. Os objetivos deste trabalho foram o desenvolvimento de uma metodologia espec?fica para avaliar radiograficamente a perda ?ssea linear em implantes mais distais, adjacentes ao cantilever prot?tico em PTFIs e investigar sua poss?vel correla??o com extens?o de cantilever e inclina??o m?sio-distal do implante. Foram acompanhados sete pacientes com 10 PTFIs (N=20 implantes) durante um ano, nas cl?nicas da Faculdade de Odontologia da PUCRS. A medi??o da extens?o de cantilever prot?tico na infraestrutura met?lica foi realizada durante o tratamento. A inclina??o m?sio-distal dos implantes foi adquirida atrav?s de Tomografia computadorizada Cone Beam (CBCT) considerando o plano oclusal como refer?ncia. Foram realizadas radiografias intra-orais digitais, utilizando posicionadores customizados, ap?s a entrega da pr?tese (baseline) e no acompanhamento de um ano. Extens?o de cantilever, inclina??o dos implantes e perda ?ssea foram analisados de forma descritiva e inferencial; a correla??o entre perda ?ssea, extens?o de cantilever e inclina??o do implante foi efetuada com coeficiente de correla??o de Spearman ao n?vel de signific?ncia de 5%. Os valores m?dios e sua variabilidade foram: extens?o de cantilever 9,80? 3,69 mm, Inclina??o Distal 2,50 (1,00; 10,50) graus, Inclina??o Mesial -3,00 (-5,00; -1,00) graus e perda ?ssea M -0,08 (-0,28; 0,05) mm e perda ?ssea D -0,04 (-0,35; 0,09) mm. N?o houve correla??o estat?stica nem entre perda ?ssea marginal e extens?o de cantilever prot?tico nem entre perda ?ssea marginal inclina??o dos implantes mais distais. Este trabalho demonstrou que a t?cnica de obten??o e an?lise das imagens radiogr?ficas ? confi?vel e reprodut?vel. Os achados de perda ?ssea em um ano est?o de acordo com a literatura.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1254 |
| Date | 31 March 2014 |
| Creators | Camargo, Bernardo Alievi |
| Contributors | Shinkai, Rosemary Sadami Arai |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, BR, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 600, 4673435736271820140 |
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