ABSTRACT
Objetivo: este estudo retrospectivo avaliou o índice de sucesso de restaurações implantossuportadas de função imediata, com fixações zigomáticas associadas aos implantes convencionais. Material e métodos: foram avaliadas as fichas clínicas de todos os pacientes atendidos na clínica particular dos autores. Os critérios de inclusão foram: edentulismo total ou parcial de maxila, com indicação de extração dos dentes remanescentes; saúde geral compatível; ausência de hábitos parafuncionais; capacidade física para a manutenção e higienização das próteses; seios maxilares saudáveis; ausência de enxertia óssea prévia; procedimentos cirúrgicos e protéticos pelo mesmo cirurgião e protesista. Após exame prévio e confecção do guia cirúrgico, os pacientes foram operados com a técnica preconizada por Stella e Warner, 2000. Os controles foram realizados após dez, 30, 60 dias e, posteriormente, a cada seis meses para avaliação dos implantes, da higiene oral, da condição da prótese e da oclusão. Resultados: 12 pacientes com maxilas atróficas foram incluídos no estudo, sendo oito mulheres (66,7%) e quatro homens (33,3%). A idade dos pacientes variou entre 41 e 73 anos, com média de 56,5. Foram instalados 22 implantes zigomáticos e 38 implantes convencionais.As próteses foram instaladas e ajustadas de 24 a 36 horas após o procedimento cirúrgico. Ao longo das avaliações, os pacientes apresentaram ausência de infecção peri-implantar e poucas complicações compatíveis com o procedimento realizado (três cirúrgicas, seis protéticas). Conclusão: nos limites desse estudo observacional, longitudinal e retrospectivo com implantes zigomáticos, pôde-se concluir que todos os implantes avaliados estavam nos critérios de sobrevivência e de sucesso no período de observação.
Objective: this retrospective study evaluated the success index of immediate implant-supported restorations with zygomatic fi xations associated to conventional implants. Material and methods: the clinical records of all treated patients at the author´s clinics were evaluated. The inclusion criteria were as follows: partial or total maxillary edentulism, indications for tooth extraction, adequate general health, lack of parafunctional habits, capacity for good oral hygiene, healthy maxillary sinuses, lack of previous bone grafting, surgical and prosthetic procedures made by the same practitioner. After previous examining and surgical guide fabrication, all surgeries were performed according the Stella and Warner´s technique (2000). Follow-ups were made at 10, 30, 60 days, and each six months for implant, occlusal, and oral hygiene related conditions. Results: 12 patients with atrophic maxillae were included, being 8 women (66.7%) and 4 men (33.3%). Patient´s age varied from 41 to 73 years-old (mean 56,5 years). Twenty-two zygomatic and 38 conventional implants were, installed. All prostheses were delivered at 24 or 36 hours after the surgical procedure. No peri-implant infections were observed, and a few complications (3 surgical, 6 prosthodontic) were seen. Conclusion: within the limits of this observational, longitudinal, and retrospective study with zygomatic implants, all installed fixtures fit the survival criteria over the studied period.
Subject(s)
Humans , Dental Implantation, Endosseous , Osseointegration , ZygomaABSTRACT
La oseointegración se ha optimizado favorablemente en los últimos años y tecnologías variadas se han aplicado para mejorar esta condición. El objetivo de esta investigación fue conocer la relación entre la aplicación de cargas eléctricas y su capacidad de mejorar la oseointegración en un modelo animal. 16 conejos de raza New Zealand, de 3 a 6 meses, fueron divididos en dos grupos. En ambos se realizo la instalación de 4 implantes de titanio especialmente diseñados para esta investigación, dos en cada tibia, utilizando técnicas de compresión. En el grupo experimental se aplico cargas eléctricas a nivel de extremidades inferiores durante 30 minutos por día mientras duraba el tiempo previo a la eutanasia de los animales realizada finalmente a los 21 y 42 días, momento en el cual fue realizada la prueba de torque de retiro con un torquímetro manual; posteriormente, los bloque con los implantes fueron retirados y se procesaron con técnicas histológicas de rutina para la tinción de Hematoxilina y Eosina; se realizo una observación descriptiva mediante microscopia óptica y los resultados numéricos fueron analizados con el análisis de varianza y posteriormente utilizando el test F con un nivel de significancia de 5%. Los resultados mostraron diferencias significativas en el torque de retiro de implantes a los 21 días y a los 42 días; no se observaron diferencias significativas entre el grupo control y el grupo experimental; histológicamente, no se observaron diferencias en el patrón de osificación, la disposición de elementos u otras condiciones histológicas de la reparación. Se puede concluir que la administración de cargas eléctricas en este modelo experimental no contribuye a la formación de tejido óseo perimplantar.
Osseointegration has been optimized in the last years; differents technologies has been applied to improve this condition. The aim of this research is to understand the relationship between the application of electric charges and their ability to improve osseointegration in an animal model. Sixteen New Zealand white male rabbits, 3 to 6 months of age, were divided into two groups. In both was inserted a 4 titanium implants designed for this research, two on each tibia; compression techniques was conducted for to install the implant. In the experimental group electric charges at the level of lower limbs was applied for 30 minutes per day; the euthanasia of the animals was performed at 21 and 42 days, at which time was obtained the measurement of the retirement torque with a manual torque wrench; subsequently, the blocks with implants were removed and processed with routine histological techniques with hematoxylin and eosin; a descriptive observation was performed by optical microscopy and the numerical results were analyzed by analysis of variance and then using the F test with a significance level of 5%. The results showed significant differences in removal torque of implants at 21 and 42 days; no significant differences between the control group and the experimental group were observed; Histologically, no differences in elements disposition or other histological repair conditions were observed. It can be concluded that the administration of electric charges in this experimental model does not contribute to the formation of perimplant bone tissue.