RESUMO
BACKGROUND AND OBJECTIVES: The aim of this study was to evaluate the effect of radiotherapy on the osseointegration of dental implants in the tibia and the action of platelet-rich plasma (PRP) as an adjuvant therapy. MATERIAL AND METHODS: A total of 18 rabbits received two implants in each tibial epiphysis, totalizing 72 implants. The control group (group I) was composed by six rabbits and did not receive radiotherapy. The test groups (II and III) received a single dose of 1727 cGy. Group II was composed by six irradiated animals and group III by six animals that received irradiation and PRP during implant placement. The implant success rate, the bone-implant contact (BIC), and the bone volume were analyzed. RESULTS: There was no osseointegration in four of the implants, three in group II and one in group III. Total BIC was significantly higher in group I, when compared to the other groups. There was a significant difference of osteoid BIC only between irradiated animals (group II, 8.5%; group III, 4.7%; p = 0.001). On the other hand, the mineralized BIC was significantly higher in group I. Furthermore, group II had a lower mineralized BIC than group III (p = 0.002). Bone volume was higher in the control group (41.3%), followed by group III (33.4%) and II (25.1%), with differences between groups I and II (p = 0.001) and groups II and III (p = 0.022). CONCLUSIONS: The present study showed that both the bone volume and BIC were higher in the control group. However, the failure rates of the implants were low in both irradiated groups. The PRP was a positive adjuvant in the osseointegration process.
Assuntos
Implantes Dentários , Osseointegração/efeitos da radiação , Tíbia/efeitos da radiação , Animais , Implantação Dentária Endóssea/métodos , Falha de Restauração Dentária , Masculino , Coelhos , Tíbia/cirurgia , TitânioAssuntos
Hepatopatias Parasitárias/cirurgia , Derivação Portossistêmica Cirúrgica , Esquistossomose/cirurgia , Esplenopatias/cirurgia , Derivação Esplenorrenal Cirúrgica , Adolescente , Adulto , Criança , Varizes Esofágicas e Gástricas/prevenção & controle , Humanos , Hipertensão Portal/cirurgia , Pessoa de Meia-Idade , Complicações Pós-OperatóriasRESUMO
Os autores apresentam os resultados de 74 pacientes portadores de hipertensao porta esquistossomotica sobmetidos a anastomose esplenorrenal seletiva com indicacao profilatica. Houve 2 0bitos (2,7%) e 3 casos de trombose da anastomose (4,05%). O controle endoscopico pos-operatorio das varizes em 40 casos mostrou ausencia em 14 (35%) e reducao em 23, ou seja 57,5%. Em face dos resultados, consideram valida a cirurgia profilatica na forma hepatosplenica da esquistossomose mansonica