RESUMO
Many cases demonstrating the oral manifestations of Langerhans cell histiocytosis (LCH) have been reported; however, tooth development in jaw lesions has rarely been mentioned. This paper reports the case of a 3-year-old Japanese girl with LCH suffering from multiple osteolytic lesions of the skull and jaw bones. She was referred to our paediatric clinic because of swelling of the mucogingival folds in the upper and lower primary molar regions. The patient responded well to steroid therapy and the osteolytic lesions resolved. There was an accompanying development of permanent tooth germs included in the lesions. Langerhans cell histiocytosis in children usually has a long-term clinical course and paediatric dentists should be involved with oral health care for affected patients.
Assuntos
Histiocitose de Células de Langerhans/fisiopatologia , Doenças Mandibulares/fisiopatologia , Doenças Maxilares/fisiopatologia , Odontogênese/fisiologia , Dente Pré-Molar/fisiopatologia , Pré-Escolar , Feminino , Seguimentos , Humanos , Dente Molar/fisiopatologia , Osteólise/fisiopatologia , Germe de Dente/fisiopatologiaRESUMO
PURPOSE: Aging is clinically related to tooth eruption; however, there are no known studies that have elucidated the relationship. We examined whether tooth eruption would occur normally in a mature subject. MATERIALS AND METHODS: Using vascularized composite tissue mandibular transplantation, we extracted portions of immature mandibles including the tooth germs from young beagle dogs and placed them into unrelated immature and mature beagle dogs. We then examined eruption of the lower first molar in the grafted mandibular bone and compared the results clinically, radiographically, and histologically. RESULTS: Normal tooth eruption was observed in the transplanted mandibles in the young dogs. In the mature dogs, eruption from the gingiva was delayed, whereas that from alveolar bone occurred normally in the transplanted mandibles. Further, the whole crown was covered with a cap of gingival tissue in the mature dogs, although this cap was not gingival overgrowth. CONCLUSIONS: Tooth eruption is influenced by some unknown factors related to aging. Apparently, apoptosis did not occur in the connective tissues between the reduced enamel epithelia and oral epithelia that overlay the teeth in the mature subjects.
Assuntos
Envelhecimento/fisiologia , Mandíbula/transplante , Erupção Dentária/fisiologia , Germe de Dente/transplante , Processo Alveolar/patologia , Processo Alveolar/fisiopatologia , Animais , Cães , Órgão do Esmalte/patologia , Órgão do Esmalte/fisiopatologia , Epitélio/patologia , Epitélio/fisiopatologia , Gengiva/patologia , Gengiva/fisiopatologia , Mandíbula/patologia , Dente Molar/patologia , Dente Molar/fisiopatologia , Odontogênese/fisiologia , Tomografia Computadorizada por Raios X , Germe de Dente/patologia , Germe de Dente/fisiopatologia , Dente Decíduo/fisiopatologia , Dente Decíduo/transplante , Transplante HomólogoRESUMO
BACKGROUND: Odontoma-like structures are formed in the jaw bone of osteopetrotic (op/op) mice, which have a congenital deficiency in osteoclastic differentiation due to the absence of functional macrophage colony-stimulating factor (M-CSF). METHODS: To clarify the histopathogenesis of tooth malformation and odontoma-like structures, a 2-year postnatal process of development of the op/op mandibular incisor was examined radiologically and histologically. At the same time, extracellular matrix (ECM) remodeling around tooth germs was analyzed immunohistochemically. RESULTS: Abnormal forms of op/op tooth germ were noticeable even at 3 days after birth on a radiogram. Histologically, op/op mice were clearly distinguished by the disappearance of dental follicular space at 3 days. With aging, bone trabeculae, which were not remodeled, penetrated into op/op tooth germs and divided them into several daughter germs, which were recognized as odontomas. In mandibular incisor bodies, the immature ECM components, such as heparan sulfate proteoglycan and tenascin, were preserved diffusely in the dental papilla/pulp, which indicates that maturation of the stroma does not take place in op/op mandibular incisors. CONCLUSION: The observation suggests that the disturbed morphogenesis of op/op tooth germs is functionally explained by the disordered immunolocalization of ECM molecules, and that the dental follicular space is essential for normal tooth development because it prevents bone penetration into the tooth germs.
Assuntos
Fator Estimulador de Colônias de Macrófagos/deficiência , Neoplasias Mandibulares/etiologia , Odontoma/etiologia , Osteopetrose/fisiopatologia , Erupção Dentária , Germe de Dente/anormalidades , Germe de Dente/fisiopatologia , Animais , Anticorpos Monoclonais , Remodelação Óssea , Diferenciação Celular , Matriz Extracelular/patologia , Proteínas da Matriz Extracelular/análise , Técnicas Imunoenzimáticas , Incisivo/anormalidades , Incisivo/fisiopatologia , Fator Estimulador de Colônias de Macrófagos/genética , Neoplasias Mandibulares/diagnóstico por imagem , Camundongos , Camundongos Mutantes , Odontogênese , Odontoma/diagnóstico por imagem , Osteoclastos/patologia , Osteopetrose/complicações , Osteopetrose/congênito , Osteopetrose/genética , Osteopetrose/patologia , Radiografia , Anormalidades Dentárias/complicações , Erupção Dentária/genética , Erupção Dentária/fisiologiaRESUMO
BACKGROUND: Incisor tooth germs of osteopetrotic (op/op) mice are known to fail to erupt, but form odontomas in their root apices instead, due to invasion of alveolar bone trabeculae into the tooth germs. The purpose of this study is to determine if the tooth developmental failures in op/op mice are intrinsic or secondarily arise as a result of the defective bone metabolism due to lack of macrophage colony-stimulating factor (M-CSF). METHODS: We isolated mandibular first molar tooth germs from normal and op/op mice and cultured them under conditions with or without bone tissues which had been formed around tooth germs. RESULTS: Tooth germs from normal mice, cultured for a week, showed almost the same developmental features as those of mice with the corresponding age. They were surrounded with dental follicular tissues and were never invaded by bone trabeculae. On the other hand, op/op tooth germs cultured in the presence of bone components were invaded by alveolar bone trabeculae around tooth germs in the same manner as shown in vivo. When cultured without bone, they developed without any interruptions. CONCLUSIONS: These findings indicated that op/op tooth germs had potential for normal development and that their abnormal development was a secondary phenomenon caused by lack of bone remodeling in the early phase of odontogenesis.
Assuntos
Fator Estimulador de Colônias de Macrófagos/deficiência , Odontogênese/fisiologia , Osteopetrose/complicações , Osteopetrose/fisiopatologia , Germe de Dente/fisiopatologia , Animais , Remodelação Óssea , Células Cultivadas , Neoplasias Mandibulares/etiologia , Camundongos , Camundongos Mutantes , Dente Molar/anormalidades , Dente Molar/fisiopatologia , Odontoma/etiologia , Técnicas de Cultura de Órgãos , Osteopetrose/congênito , Anormalidades Dentárias/etiologia , Erupção Dentária , Germe de Dente/anormalidadesRESUMO
PURPOSE: The purpose of this study was to observe developing teeth in a lengthened mandible after distraction. MATERIAL: Ten mongrel dogs with deciduous dentitions were used. METHODS: A corticotomy was carefully made around a tooth bud and the external distractor (Orthofix M-100) was connected. After a 5-day latent period, distraction was started at a rate of 0.75 mm per day for 10 consecutive days. Then, the lower jaw was stabilized by an external fixation to allow ossification. While the operation was performed on the left side (Distraction group), the contralateral side was studied for comparison (Control). In addition, a corticotomy, artificial fracture and external fixation were carried out to confirm the influence of the operation (Fracture group). Then macroscopic, radiographic and histological evaluations were carried out. RESULTS: In the Distraction group, the space between the wall of the dental follicle and the crown expanded as distraction began. The end of the calcified root became wider and irregular during the distraction period, and finally, the apex closed. In the Fracture group, the teeth erupted although slight alterations of the root shape were observed in association with the operation period. CONCLUSION: The root became irregular, but the teeth erupted within the distraction area.
Assuntos
Mandíbula/cirurgia , Odontogênese/fisiologia , Osteogênese por Distração , Germe de Dente/fisiopatologia , Animais , Saco Dentário/diagnóstico por imagem , Saco Dentário/patologia , Saco Dentário/fisiopatologia , Cães , Fixadores Externos , Fixação de Fratura/instrumentação , Mandíbula/diagnóstico por imagem , Mandíbula/patologia , Fraturas Mandibulares/diagnóstico por imagem , Fraturas Mandibulares/fisiopatologia , Osteogênese , Osteogênese por Distração/instrumentação , Osteogênese por Distração/métodos , Osteotomia/métodos , Radiografia , Ápice Dentário/diagnóstico por imagem , Ápice Dentário/patologia , Ápice Dentário/fisiopatologia , Calcificação de Dente/fisiologia , Coroa do Dente/diagnóstico por imagem , Coroa do Dente/patologia , Coroa do Dente/fisiopatologia , Erupção Dentária/fisiologia , Germe de Dente/patologia , Raiz Dentária/diagnóstico por imagem , Raiz Dentária/patologia , Raiz Dentária/fisiopatologiaRESUMO
Esta entidad patológica de la cavidad oral del niño es una alteración poco conocida en el ámbito odontológico, no obstante haber sido descripta hace más de treinta años por el odontólogo guatemalteco Dr. O Menéndez, el cual la observó en niños nativos de su país. Pocos años después, el Dr. Serrano reportó muchos casos de esta afección bucal visto en niños aborígenes ecuatorianos
Assuntos
Humanos , Pré-Escolar , Criança , Dente Decíduo , Perda de Dente/fisiopatologia , Raiz Dentária/patologia , Reabsorção da Raiz/fisiopatologia , Germe de Dente/fisiopatologia , Traumatismos Dentários/terapia , Equador/epidemiologia , Guatemala/epidemiologiaRESUMO
Intrusion injuries of the primary dentition are highly associated with developmental disturbances of their successor teeth. The age of the child at the time of injury, the direction and severity of the intrusion, and the presence of alveolar bone fracture are important variables influencing the effect of primary tooth intrusion on the developing permanent germ. The developmental defects of the permanent successor tooth range from mild alteration in enamel mineralization to severe sequestration of the developing germ. This article will review the developmental anomalies of the permanent incisors induced by intrusion injuries of their predecessors.
Assuntos
Incisivo/lesões , Avulsão Dentária/complicações , Dente Decíduo/lesões , Fatores Etários , Processo Alveolar/lesões , Criança , Pré-Escolar , Esmalte Dentário/fisiopatologia , Hipoplasia do Esmalte Dentário/etiologia , Humanos , Incisivo/anormalidades , Lactente , Fraturas Maxilomandibulares/complicações , Odontogênese/fisiologia , Odontoma/etiologia , Avulsão Dentária/classificação , Calcificação de Dente/fisiologia , Coroa do Dente/anormalidades , Descoloração de Dente/etiologia , Erupção Dentária/fisiologia , Germe de Dente/fisiopatologia , Raiz Dentária/anormalidadesRESUMO
Investigation was performed on the effects of removing the inferior alveolar neurovascular structures on the permanent dentition and mandibular growth. Five puppies with erupted deciduous teeth had the inferior alveolar neurovascular structures removed unilaterally. When the test animals were 28 weeks old, examination revealed that the deciduous teeth on the side operated had exfoliated but permanent teeth did not replace them. On the other hand, the permanent teeth on the side not operated on replaced the exfoliated deciduous teeth. After a second period of 28 weeks, the germs of the permanent teeth on the side operated on were still buried in the mandibular bone, and the permanent teeth on the side not operated on erupted normally. Mandibular measurements demonstrated that translative and transformative growth and developmental processes were normal in both the sides operated on and the sides not operated on.
Assuntos
Mandíbula/crescimento & desenvolvimento , Nervo Mandibular/fisiologia , Erupção Dentária/fisiologia , Animais , Vasos Sanguíneos/fisiologia , Cães , Mandíbula/anatomia & histologia , Mandíbula/irrigação sanguínea , Nervo Mandibular/cirurgia , Esfoliação de Dente/fisiopatologia , Germe de Dente/fisiopatologia , Dente Decíduo , Dente não Erupcionado/fisiopatologiaRESUMO
The osteopetrotic op/op rats suffered from a complete failure of tooth eruption in association with a reduced bone resorption. An unresorbed occlusal bone overlaid the germs which remained embedded in bone. The process of prefunctional eruption in limited growing teeth depends on the resorption of the alveolar bone covering the germs. The aim of this study was to investigate the effects of hematopoïetic grafts in newborn op/op rats on the process of prefunctional eruption. Fifteen op/op treated rats were used for radiographic, microradiographic and histologic examinations. After transfusion of bone marrow cells, we observed the restoration of bone resorption and a delayed eruption of the molars. The incisors never erupted. They developed odontome-like tumors near their apices. These results confirm the dependence of tooth eruption on bone resorption.
Assuntos
Transplante de Medula Óssea , Doenças Maxilomandibulares/fisiopatologia , Osteopetrose/fisiopatologia , Germe de Dente/fisiopatologia , Dente Impactado/fisiopatologia , Animais , Reabsorção Óssea/fisiopatologia , Incisivo/patologia , Neoplasias Maxilomandibulares/patologia , Dente Molar/fisiopatologia , Odontogênese , Odontoma/patologia , Osteopetrose/cirurgia , Ratos , Ratos Endogâmicos , Ratos Mutantes , Erupção DentáriaAssuntos
Dente/patologia , Abrasão Dentária/etiologia , Anormalidades Dentárias/classificação , Anormalidades Dentárias/etiologia , Cárie Dentária/classificação , Cárie Dentária/diagnóstico , Cárie Dentária/etiologia , Cárie Dentária , Dens in Dente/etiologia , Dente Supranumerário/etiologia , Germe de Dente/fisiopatologiaAssuntos
Dente/patologia , Abrasão Dentária/etiologia , Anormalidades Dentárias/classificação , Anormalidades Dentárias/etiologia , Cárie Dentária/classificação , Cárie Dentária/diagnóstico , Cárie Dentária/etiologia , Cárie Dentária , Dens in Dente/patologia , Dente Supranumerário/etiologia , Germe de Dente/fisiopatologiaRESUMO
Os autores, através da descriçäo de um caso de dilaceraçäo dental de um incisivo central superior, repöem o germem do dente dilacerado em uma posiçäo normal e acompanham o caso até a completa formaçäo apical