RESUMO
AIM: The aim of the present study was to evaluate and compare the wound-healing process following osteotomies performed with either conventional rotary burs or piezoelectric surgery in a rabbit model. METHODS: Two types of osteotomy window defects of the nasal cavities were prepared on the nasal bone of 16 adult New Zealand white rabbits with either a conventional rotary bur or piezo surgery. The defects were covered with a resorbable membrane. Four animals were killed at 1, 2, 3, and 5 weeks after the surgical procedure, respectively. Histological and morphometric evaluations were performed to assess the volumetric density of various tissue components: the blood clot, vascularized structures, provisional matrix, osteoid, mineralized bone, bone debris, residual tissue, and old bone. RESULTS: Significantly more bone debris was found at 1 week in the conventionally-prepared defects compared to the piezo surgically-prepared defects. At 2 and 3 weeks, a newly-formed hard tissue bridge, mainly composed of woven bone, was seen; however, no statistically-significant differences were observed. At 5 weeks, the defects were completely filled with newly-formed bone. CONCLUSION: The defects prepared by piezo surgery showed a significantly decreased proportion of bone debris at 1 week, compared to conventional rotary bur defect.
Assuntos
Cavidade Nasal/cirurgia , Osteotomia/instrumentação , Piezocirurgia/instrumentação , Implantes Absorvíveis , Animais , Coagulação Sanguínea/fisiologia , Densidade Óssea/fisiologia , Matriz Óssea/patologia , Calcificação Fisiológica/fisiologia , Membranas Artificiais , Modelos Animais , Osso Nasal/irrigação sanguínea , Osso Nasal/patologia , Osso Nasal/cirurgia , Cavidade Nasal/irrigação sanguínea , Cavidade Nasal/patologia , Osteoblastos/patologia , Osteoclastos/patologia , Osteogênese/fisiologia , Projetos Piloto , Coelhos , Levantamento do Assoalho do Seio Maxilar/instrumentação , Cicatrização/fisiologiaRESUMO
Primary intraosseous venous malformations are rare benign tumors that account for approximately 1% of all primary osseous tumors. They are rarely found in the midface. The authors report a case of an intraosseous venous malformation in a 28-year-old woman who presented with a bony lesion in the nasal bone. Treatment involved surgical excision via open rhinoplasty. Histopathology indicated an intraosseous venous malformation. 16 months postoperatively, there was no evidence of recurrence, the functional and cosmetic results were good, and the patient was satisfied with the treatment outcome.
Assuntos
Osso Nasal/irrigação sanguínea , Procedimentos de Cirurgia Plástica/métodos , Malformações Vasculares/cirurgia , Adulto , Cartilagem/transplante , Estética , Fascia Lata/transplante , Feminino , Humanos , Osteotomia , Satisfação do Paciente , Rinoplastia/métodos , Retalhos Cirúrgicos , Tomografia Computadorizada por Raios X , Resultado do TratamentoRESUMO
Vomeronasal tissues from four male gnotobiotic calves were prepared for transmission and scanning electron microscopy. Features described include: non-myelinated nerves in the non-neurosensory lamina propria, capillaries in the base of the neurosensory epithelium, sustentacular cells with microvilli 22-26 micron long, neurosensory cells with numerous apical vesicles, cells with cytoplasmic projections containing dense bundles of filaments, and brush cells. The structurally well developed bovine vomeronasal organ is similar in other respects to that reported for a number of other mammals.
