Greison Rabelo de Oliveira

Bacterial adhesion and colonization differences between zirconia and titanium implant abutments: an in vivo human study

Purpose Several parameters have been described for determining the success or failure of dental implants. The surface properties of transgingival implant components have had a great impact on the long-term success of dental implants. The purpose of this study was to compare the tendency of two periodontal pathogens to adhere to and colonize zirconia abutments and titanium alloys both in hard surfaces and soft tissues. Methods Twelve patients participated in this study. Three months after implant placement, the abutments were connected. Five weeks following the abutment connections, the abutments were removed, probing depth measurements were recorded, and gingival biopsies were performed. The abutments and gingival biopsies taken from the buccal gingiva were analyzed using real-time polymerase chain reaction to compare the DNA copy numbers of Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and total bacteria. The surface free energy of the abutments was calculated using the sessile water drop method before replacement. Data analyses used the Mann Whitney U-test, and P-values below 0.05 find statistical significance. Results The present study showed no statistically significant differences between the DNA copy numbers of A. actinomycetemcomitans, P. gingivalis, and total bacteria for both the titanium and zirconia abutments and the biopsies taken from their buccal gingiva. The differences between the free surface energy of the abutments had no influence on the microbiological findings. Conclusions Zirconia surfaces have comparable properties to titanium alloy surfaces and may be suitable and safe materials for the long-term success of dental implants.

Maxillary Sinus Floor Augmentation Using Blood Without Graft Material. Preliminary Results in 10 Patients

PURPOSE The maxillary sinus lift is recognized and stable, and there have been different innovations to optimize the technique. The aim of this study was to investigate the maxillary sinus lift technique with the use of a blood clot and without the use of a bone graft. MATERIALS AND METHODS Ten patients were recruited for a unilateral sinus lift; patients without sinus pathology or other contraindication were selected. The maxillary sinus was accessed conventionally under local anesthesia followed by an osteotomy and a 1-cm(2) bony window access. The sinus membrane was detached and the window was repositioned above and stabilized with a 12- or 14-mm osteosynthesis screw introduced through the alveolar ridge. Dental implants were installed in the second surgical stage. Standardized panoramic radiographic checks were performed at every stage. RESULTS Seven completely edentulous patients and 3 partially dentate patients were treated surgically. From the first to the second surgery, a bone gain of 2.37 mm was obtained, although loss of bone height was observed in 1 completely edentulous patient. In 7 patients, it was not possible to install the implants owing to insufficient bone height or inadequate bone quality. CONCLUSION The protocol used in this investigation failed in the bone increase required for implant installation.

Bifosfonatos asociado a osteonecrosis de los maxilares: Revisión de la literatura

Los bifosfonatos son una familia de drogas usadas comunmente en el tratamiento de alteraciones oseas causadas principalmente por tumores malignos y osteoporosis. En el ano 2003 fue relatado el primer caso de osteonecrosis de los maxilares asociado al uso de bifosfonatos. Esta condicion patologica presenta un mal pronostico y una incidencia creciente. El objetivo de este articulo es orientar a los cirujanos dentistas sobre los factores causales y formas de tratamiento de dicha alteracion.

Prevalência de fraturas mandibulares no serviço de residência em cirurgia bucomaxilofacial do Hospital Universitário do Oeste do Paraná

Objetivo: A mandibula apresenta um alto indice de acometimento nos traumatismos de face. Tais fraturas podem levar a grandes prejuizos esteticos, funcionais e financeiros e suas caracteristicas epidemiologicas tem sofrido alteracoes em diversas localidades. O objetivo, portanto, e tracar o perfil dos pacientes com fratura mandibular atendidos no Hospital Universitario do Oeste do Parana (HUOP), Cascavel (PR), Brasil, dando enfoque em sua etiologia, relacao faixa etaria/genero e regiao anatomica acometida. Material e metodos: Foi realizado um estudo retrospectivo dos pacientes diagnosticados com fraturas mandibulares atendidos pela especialidade no HUOP no periodo de junho de 2007 a junho de 2013 por meio da analise de prontuarios e de exames de imagem. Os dados de ano de ocorrencia do traumatismo, faixa etaria, genero, etiologia e regiao anatomica acometida foram coletados em uma ficha clinica especifica e analisados a partir da distribuicao de frequencia. Resultados: Dos 785 pacientes com traumatismo maxilofacial atendidos no periodo do estudo, 204 (25,98%) apresentaram algum tipo de fratura mandibular. A faixa etaria variou de 2 a 75 anos, proporcao homem/mulher de aproximadamente 4:1. As principais etiologias foram os acidentes de trânsito (59,31%), agressoes (16,18%) e ferimentos por arma de fogo (10,29%). As regioes anatomicas mais acometidas foram a parassinfise (27,73%), condilo (26,4%) e ângulo mandibular (13,86%). Conclusao: A incidencia e causas de fraturas mandibulares refletem o padrao de traumatismo facial de uma comunidade e, portanto, podem auxiliar no desenvolvimento de medidas preventivas, principalmente em relacao a maior fiscalizacao de trânsito e controle da criminalidade.