RESUMO
The histologic examination of dental implants retrieved from humans provides a unique opportunity to evaluate the bone-implant interface. This case report presents a clinical, radiographic, and histologic evaluation of a cylindrical hydroxyapatite- (HA) coated implant retrieved from the posterior maxillary area of a patient after 9 years after placement. The implant had been placed in conjunction with a subantral augmentation procedure with HA as the graft material. Clinical examination revealed an immobile implant with no sign of pathosis. Radiographic examination indicated close proximity of the bone to the implant surface without evidence of radiolucency. Histologically, because of tissue destruction during implant retrieval, only the apical portion of the implant was available for examination under light microscopy, and it appeared to be integrated with the surrounding bone; 45.9% of the surface of the implant had close bone apposition at the interface. There was no evidence of dissolution of the HA coating and the bone appeared to be in immediate contact with the coating. Residual graft particles were present and in close proximity with the implant surface. These observations suggest that the subantral augmentation procedure performed simultaneously with the placement of an HA-coated implant with HA as the graft material apparently resulted in osseointegration between the implant and the surrounding bone. The implant was maintained without complication for 9 years.
Assuntos
Aumento do Rebordo Alveolar/métodos , Materiais Revestidos Biocompatíveis , Implantes Dentários , Durapatita , Maxila/patologia , Seio Maxilar/patologia , Substitutos Ósseos/uso terapêutico , Planejamento de Prótese Dentária , Durapatita/uso terapêutico , Feminino , Seguimentos , Humanos , Processamento de Imagem Assistida por Computador , Maxila/diagnóstico por imagem , Maxila/cirurgia , Seio Maxilar/diagnóstico por imagem , Seio Maxilar/cirurgia , Pessoa de Meia-Idade , Osseointegração , Radiografia , Propriedades de SuperfícieRESUMO
The uses of cytokine growth factors in soft tissue applications has been reported on. The scientific background and various processing techniques to prepare the autologous materials are reviewed here. An ongoing research project to study grafting of the maxillary sinus for bone regeneration and implant site preparation with the growth factor Platelet Rich Plasma is outlined.
Assuntos
Perda do Osso Alveolar/cirurgia , Transplante Ósseo/métodos , Seio Maxilar/cirurgia , Procedimentos Cirúrgicos Pré-Protéticos Bucais/métodos , Transfusão de Plaquetas/métodos , Transfusão de Sangue Autóloga , Cloreto de Cálcio , Centrifugação , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Plasma , Transfusão de Plaquetas/instrumentação , Fator de Crescimento Derivado de Plaquetas/administração & dosagem , TrombinaRESUMO
This article describes a technique for fabricating a provisional screw-retained restoration for immediate loading of single implants. Until immediate loading of single implants becomes a well-documented treatment modality, this technique should be used cautiously.
Assuntos
Resinas Acrílicas , Dente Suporte , Implantes Dentários para Um Único Dente , Stents , Idoso , Coroas , Implantação Dentária Endóssea/instrumentação , Implantação Dentária Endóssea/métodos , Planejamento de Prótese Dentária , Restauração Dentária Temporária , Feminino , Humanos , Mandíbula/cirurgiaRESUMO
This article presents a histologic evaluation of three hydroxyapatite (HA)-coated root-form implants retrieved from humans after being in function for 3.5 to 11 years. If the coronal portion, where bone loss was observed clinically and radiographically, is excluded, all implants appeared to be well osseointegrated, with intimate contact between the surrounding bone and the coating. There was no sign of resorption or dissolution of the HA coating. The coating had a uniform thickness (50 microm) equal to the thickness originally provided by the manufacturer In the few areas where there was no bone contact, the HA coating appeared to line the implant with no sign of dissolution. The few detached particles had tight contact with the bone, demonstrating the biocompatibility of the HA. The observations from the three reported cases suggest that the HA coating of dental implants may not be susceptible to resorption or dissolution under long-term function.
Assuntos
Materiais Revestidos Biocompatíveis , Implantes Dentários para Um Único Dente , Durapatita , Maxila/patologia , Raiz Dentária , Adulto , Perda do Osso Alveolar/diagnóstico por imagem , Materiais Biocompatíveis/química , Remodelação Óssea , Reabsorção Óssea/diagnóstico por imagem , Materiais Revestidos Biocompatíveis/química , Falha de Restauração Dentária , Remoção de Dispositivo , Durapatita/química , Feminino , Seguimentos , Humanos , Masculino , Maxila/diagnóstico por imagem , Maxila/cirurgia , Microscopia de Polarização , Pessoa de Meia-Idade , Osseointegração , Radiografia Interproximal , Radiografia Panorâmica , Solubilidade , Propriedades de SuperfícieRESUMO
This case report presents a clinical, radiographic, and histologic evaluation of 2 non-adjacent, hydroxyapatite-coated, root-form implants retrieved from the maxillary canine area of a patient after 7 years in function. Clinical examination revealed immobile implants with no sign of pathosis. Radiographic examination indicated close proximity of the bone to the implant surface without evidence of radiolucency. Histologically, the 2 implants appeared to be well integrated with the surrounding bone; 84% of the surface of the first implant and 79% of the surface of the second implant had close bone apposition at the interface. There was no evidence of dissolution of the hydroxyapatite coating. The bone appeared to be in immediate contact with the coating. These observations suggest that a particular hydroxyapatite coating on root-form implants can resist degradation during long-term function.
