RESUMO
The intentions of this study were to characterize the macroscopic, microscopic, and structural aspects of a plasma-sprayed implant and to thoroughly investigate bone tissue response after its implantation in sheep. Therefore, we used scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, X-ray diffraction, and energy-dispersive X-ray analyses. Assessment of the biomaterial prior to implantation showed a coating with irregular outlines and varying thickness, mainly consisting of hydroxyapatite (HA) covering a rough metallic implant core. Six months after insertion of the HA-coated Ti-6A1-4V implant, neither mechanical failure of the coating-substrate interface nor a significant loss of coating thickness was evident. However, an occasional lack of HA coating and phagocytosis of HA particles were noted. More generally, the implant was surrounded by well-mineralized bone investing the smallest cavities of the plasma-sprayed layer. Newly formed microcrystals with size, shape, and structure similar to those of bone apatite crystals were growing directly at the coating surface. These results suggest that the bone-bonding behavior of the considered grooved implant should provide satisfactory osseointegration and be suitable for fixed prostheses.
Assuntos
Materiais Biocompatíveis , Osso e Ossos/ultraestrutura , Durapatita , Animais , Osso e Ossos/efeitos dos fármacos , Microscopia Eletrônica de Varredura , OvinosRESUMO
Orofaciodigital syndrome I is a syndrome, which affects the maxillofacial region. Abnormally developed vestibular frenulum, cleft tongue, asymmetric cleft palate, pseudocleft of the upper lip and hypoplasia of the nasal cartilages are some of the other features. There are some malformations in foot and hand fingers and also mild mental deficiency is present. OFD I syndrome follows an chi-linked dominant mode of transmission trait limited to females and lethal in males. Because of the esthetic and functional manifestations in the maxillofacial region, the syndrome has great importance for pediatric dentistry.
Assuntos
Síndromes Orofaciodigitais/patologia , Criança , Diagnóstico Diferencial , Feminino , Genes Dominantes , Ligação Genética , Humanos , Freio Labial/anormalidades , Freio Lingual/anormalidades , Má Oclusão , Mandíbula/anormalidades , Síndromes Orofaciodigitais/classificação , Síndromes Orofaciodigitais/genética , Palato/anormalidades , Linhagem , Língua/anormalidades , Cromossomo XRESUMO
Williams syndrome is a rare syndrome. It usually can be diagnosed first in dental clinics because of the typical oral and facial features of the syndrome. The aim of this article is to report this 8 year old Turkish boy with Williams syndrome, and to revise the dental features of these special patients and the dental treatment procedures that can be followed for these patients.
