RESUMO
This work aimed to analyze clinically and histologically the allogen bone graft behavior at 6 and 9 months. A leukoderm, female, 55 years old patient sought dental care for oral rehabilitation with dental implants and implant supported fixed prosthesis in the maxilla. Bilateral sinus lifting procedure were performed in a same patient, the analysis were made after 6 and 9 months, respectively. At 6 months, there was lack of a better bone remodeling in the region, associated to the presence of fibrous connective tissue within the collected tissue, showing us that this is not the best stage of tissue maturation to place dental implants. The 9 months period showed an improvement, with a more organized bone tissue surrounding particles of homogenous bone, what possibly had increased implant stability at the time of surgery. There is no doubt about the increase of clinical applications of FFBA, but there are no studies available regarding the standardization of time to load implants inserted in allografts. So papers with long-term monitoring are necessary to eliminate questions that still remain to be answered.
El objetivo fue analizar clínica e histológicamente el injerto óseo alógeno a los 6 y 9 meses. Una paciente sexo femenino, leucoderma de 55 años de edad consultó por atención odontológica para la rehabilitación oral con implantes y prótesis fija implanto soportada en el maxilar. Procedimientos de elevación del seno maxilar bilateralmente fueron realizados en la misma paciente, y se hicieron los análisis después del sexto y noveno mes, respectivamente. Al sexto mes, se observó una remodelación ósea deficiente de la región asociada a la presencia de tejido conectivo fibroso en el tejido analizado, demostrando que no era la mejor etapa de maduración óseo para instalar los implantes. Al noveno mes se observo una mejora, con un tejido óseo mas organizado rodeando partículas de hueso homogéneo, el cual posiblemente incrementaría la estabilidad del implante en el momento de la cirugía. No hay dudas respecto del incremento de aplicaciones clínicas del FFBA, pero no hay estudios capaces de estandarizar el tiempo de carga de los implantes instalados sobre aloinjertos. Investigaciones con seguimientos a largo plazo son necesarios para eliminar las preguntas que aun se mantienen sin respuesta.
RESUMO
A fim de satisfazer os objetivos ideais da Implantodontia, os tecidos duros e moles precisam apresentar volume e qualidade ideais. Enxertos ósseos autógenos são previsíveis e proporcionam a mais eficiente estrutura para os implantes osseointegrados, entretanto, a morbidade cirúrgica é grande. A utilização de osso fresco congelado torna-se uma alternativa em estudo para substituição dos enxertos autógenos em reconstruções de rebordos atróficos prevendo a instalação de implantes. O objetivo deste trabalho foi análise clínica e histológica de enxerto ósseo autógeno e osso alógeno utilizados na técnica de elevação do assoalho de seio maxilar, em um mesmo paciente, em sítios diferentes. Segundo a análise histológica, não houve diferença de neoformação entre as duas amostras.
To satisfy ideal objectives of the dental implants, hard and soft tissues need to present sufficient bone quantity and quality. Autogenous bone grafts are predictable and provide the most efficient structure for osseointegrated implants; however, significant surgical morbidity has been demonstrated. The use of fresh frozen bone becomes an alternative in the study for replacement of the autogenous grafts to reconstruct atrophic ridges for further implant placement. The objective of this case is to report clinical and histological examination of autogenous and allogenic bone grafts used in the technique of maxillary sinus lifting for the same patient at different sites. According to histological analysis after seven months, no differences in neoformati on were observed between both sites.