RESUMO
We used scanning electron microscopy to study and compare the histologic and ultrastructural aspects of the mucosa of the anterior portion of the septum (APS) and the anterior portion of the inferior concha (APINC) in 10 healthy adults and 10 cadavers. We found that (1) in most cases, the types of epithelium were generally the same in both areas--pseudostratified cylindrical ciliated epithelium with goblet cells (respiratory epithelium), stratified cuboidal epithelium, and stratified squamous nonkeratinized epithelium; (2) the APINC had more respiratory epithelium than the APS; (3) the APS had more squamous epithelium than the APINC; (4) the basement membrane of the APINC was thicker than that of the APS; (5) moderate chronic inflammatory infiltrate was more common in the APINC, and mild infiltrate was more common in the APS; and (6) the APINC had more mucous glands and the APS had more serous glands.
Assuntos
Septo Nasal/patologia , Septo Nasal/ultraestrutura , Conchas Nasais/patologia , Conchas Nasais/ultraestrutura , Adolescente , Adulto , Idoso , Epitélio/ultraestrutura , Humanos , Pessoa de Meia-Idade , Neoplasias Nasais/ultraestrutura , Lesões Pré-Cancerosas/ultraestruturaRESUMO
A estrutura óssea bonina, tanto na condição de tecido cortical como medular, viabiliza através de processo termo-químico a obtenção de material mineral rico em cálcio e fósforo com características funcionais plenemente adequadas para sua aplicação como enxerto reabsorvível e condutor para reparações de defeitos ósseos. A implantação de cilindros deste material em tíbia de coelho com posterior análise histológica por microscopia de luz, eletrônica e fluorescência, comprovam a integração biocompatível com a matriz óssea original e o estímulo condutor na neoformação tecidual rico em atividade celular para a reparação óssea do leito receptor
Assuntos
Animais , Bovinos , Osso e Ossos/química , Materiais Biocompatíveis/análise , Microscopia , TransplantesRESUMO
The bilaminar zone (BZ) in the human temporomandibular joint (TMJ) of toothed adults (GI) and toothless, elderly humans (GII) were analysed using light and scanning electron microscopy (SEM). In both groups the BZ consists of an upper and a lower stratum of connective tissue separated by a vascularized middle region. The superior stratum contains bundles of collagen fibres disposed in different directions. The fibres are fairly thick and transversely oriented immediately posterior to the TMJ disc. The initial part of the inferior stratum contains curved bundles of collagen fibres oriented anterio-posteriorly. From the middle to the posterior part of the inferior stratum, the fibres are right-aligned in GI and clearly sinuous in nature in GII. In both groups, the middle and posterior portions of the middle region are distinguished by the presence of vessels and vascular spaces. Loosely arranged connective and adipose tissues are also evident. The vascular spaces are wider in GII than in GI. The predominance of type I collagen fibres is clear in all regions of the BZ in both groups. The elastic fibres lie parallel to the collagen fibres in both groups and they are thicker and more abundant in GI, apparently decreasing in GII.
Assuntos
Envelhecimento/patologia , Articulação Temporomandibular/anatomia & histologia , Tecido Adiposo/anatomia & histologia , Tecido Adiposo/ultraestrutura , Adulto , Idoso , Idoso de 80 Anos ou mais , Compostos Azo , Colágeno/classificação , Colágeno/ultraestrutura , Corantes , Tecido Conjuntivo/anatomia & histologia , Tecido Conjuntivo/irrigação sanguínea , Tecido Conjuntivo/ultraestrutura , Dentição , Tecido Elástico/anatomia & histologia , Tecido Elástico/ultraestrutura , Feminino , Humanos , Masculino , Microscopia Eletrônica de Varredura , Microscopia de Polarização , Pessoa de Meia-Idade , Boca Edêntula/patologia , Fenazinas , Articulação Temporomandibular/irrigação sanguínea , Articulação Temporomandibular/ultraestrutura , Disco da Articulação Temporomandibular/anatomia & histologia , Disco da Articulação Temporomandibular/ultraestruturaRESUMO
The bilaminar zone (BZ) in the human temporomandibular joint (TMJ) of toothed adults (GI) and toothless, elderly humans (GII) were analysed using light and scanning electron microscopy (SEM). In both groups the BZ consists of an upper and a lower stratum of connective tissue separated by a vascularized middle region. The superior stratum contains bundles of collagem fibres disposed in diferent directions. The fibres are fairly thick and transversely oriented immediately posterior to the TMJ disc. The initial part of the inferior stratum contains curved bundles of collagem fibres oriented anterio-posteriorly. From the middle to the posterior part of the inferior stratum, the fibres are right-aligned in GI and clearly sinuous in nature in GII. In both groups, the middle and posterior portions of the middle region are distinguished by the presence of vessels and vascular spaces. Loosely arranged conective and adipose tissues are also evident. The vascular spaces are wider in GII than in GI. The predominance of type I collagen fibres is clear in all regions of the BZ in both groups. The elastic fibres lie parallel to the collagen fibres in both groups and they are thicker and more abundant in GI, apparently decreasing in GII
Assuntos
Articulação TemporomandibularRESUMO
The microvascular system arrangement of the palatine mucosa in young rabbits was studied using vascular corrosion casts. Specimens were obtained by injecting low viscosity resin. Superficial microvessels were observed mainly by scanning electron microscopy (SEM). The blood microvessels showed differing features in the areas considered palatine rugae, inter-rugal areas and posterior region of the palatine raphe. Larger vessels were noted in deeper layers. Several capillary loops were distributed all over the palatine rugal surface. In spite of being a young animal, the rabbit's palatine mucosa demonstrated a complex angioarchitecture.
Assuntos
Capilares/ultraestrutura , Microcirculação/ultraestrutura , Mucosa Bucal/irrigação sanguínea , Palato/irrigação sanguínea , Coelhos/anatomia & histologia , Animais , Feminino , Processamento de Imagem Assistida por Computador , Masculino , Microscopia Eletrônica de Varredura , Mucosa Bucal/ultraestrutura , Palato/ultraestruturaRESUMO
The three-dimensional architecture of the vascular network of the nasal septum of the gerbil rat was studied using the corrosive resin cast technique. The angioarchitecture of the nasal septum observed with scanning electron microscopy (SEM) showed that a vascular network is disposed in the lamina propria. The capillaries, arterioles, venules and arteries were closely observed in different areas of the nasal septum mucosa.
Assuntos
Capilares/ultraestrutura , Gerbillinae/anatomia & histologia , Microcirculação/ultraestrutura , Mucosa Nasal/irrigação sanguínea , Septo Nasal/irrigação sanguínea , Animais , Artérias/ultraestrutura , Arteríolas/ultraestrutura , Molde por Corrosão , Feminino , Masculino , Microscopia Eletrônica de Varredura , Vênulas/ultraestruturaRESUMO
The biocompability of the polyurethane resin of the castor bean (Ricinus vulgaris) was studied following its insertion into the alveolar bone of dogs, after extraction of their premolar teeth. The resin was left to polymerise in the dental alveolus. Excess of material due to polymerisation was removed and polishing was employed to smooth and adapt the occlusal surface to the margins of the alveolar bone. This allowed a perfect suture of the mucosa together with the periosteum. The resin remained in the dental alveolus for 90 days. It was observed that the polyurethane was replaced by osteoid and bone tissues and no immune or inflammatory reactions were detected. There has been work on and discussion about the use of the polyurethane in grafts, prostheses and orthoses. Attention was paid to all the surgical steps, in particular the preservation of the periosteal integrity. Further research is being followed in our Department in order to test the biocompatibility of the material presented in this paper when used together with metallic or ceramic implants.
Assuntos
Regeneração Óssea , Substitutos Ósseos , Mandíbula/cirurgia , Plantas Tóxicas , Poliuretanos , Ricinus communis , Animais , Cães , Mandíbula/fisiologia , Dente Molar , Extração DentáriaRESUMO
The primary (connective tissue papillae) and secondary projections of the subepithelial connective tissue of the lamina propria were studied in the hard palate of normal (control group), and in protein-deficient pups (experimental group) obtained through maternal protein deprivation during pregnancy and lactation. At birth, the primary projections in the control group are more developed in width whereas in the experimental group they are thin with a crest-like shape. On day 7 of lactation, the primary projections are abundant, well developed and regularly arranged in the control group. They are few in number and are irregular in shape and disposition in the experimental group. The secondary projections are located posterior to the primary ones in the control group and are intercalated with them in the experimental group. On day 21 of lactation, the characteristic foliate aspect of the primary projections are noted in the control group. In the experimental group they remain thin with a crest-like aspect.
Assuntos
Tecido Conjuntivo/ultraestrutura , Mucosa Bucal/ultraestrutura , Palato/ultraestrutura , Complicações na Gravidez , Efeitos Tardios da Exposição Pré-Natal , Desnutrição Proteico-Calórica , Animais , Tecido Conjuntivo/patologia , Feminino , Lactação , Microscopia Eletrônica de Varredura , Mucosa Bucal/patologia , Palato/patologia , Gravidez , Desnutrição Proteico-Calórica/embriologia , Desnutrição Proteico-Calórica/patologia , Ratos , Ratos Wistar , Valores de ReferênciaRESUMO
In orofacial implantology there are many types of implants for the different systems. Among these is the implant surface type, e.g., a screw type, cylindrical and laminar. Furthermore, the implants are different in their dimensions, their metal composition, their surface condition, such as smooth, grit or layered surfaces and in their methods of application. Two different self-tapping implants, one smooth and the other grit-blasted, are screwed into the bone, and another one with a plasma of titanium coating, which is also in a screw form but with greater spaces between the screw threads are compared. The greatest amount of bone deposition in the bone/implant interface was encountered in the latter one, the smooth surfaced implant being in second place. All of these systems can alter the implant healing process and to demonstrate this, we injected bone markers in the rabbits over different periods of time so as to observe the different areas of bone deposition in the tibias where the implants had been inserted. The bone tracers used were Alizarin, Calcein and Xylenol-orange. The amount of deposition was calculated by using the method of surface morphometry.
Assuntos
Desenvolvimento Ósseo , Calcificação Fisiológica , Implantes Dentários , Tíbia/citologia , Animais , Antraquinonas , Fluoresceínas , Corantes Fluorescentes , Fenóis , Coelhos , Sulfóxidos , Fatores de Tempo , Titânio , Cicatrização , XilenosRESUMO
The three-dimensional architecture of the vascular network of the rat's lingual papillae has been studied employing the corrosive resin cast technique. The casts of the microvasculature of these types of papillae (the small conical filiform, true filiform, fungiform and vallate papillae) have been observed under scanning electron microscopy (SEM). The microvascular arrangements of the filiform papillae consist of well-defined simple or twisted capillary loops. The fungiform papillae have a cylindrical form with a central hole, and the capillary network gives shape to the whole papilla. Finally, the capillary bed of the oval-shaped vallate papilla with its characteristic network and small hairpin-like loops was also examined.