RESUMO
Low levels of X-ray exposure of mouse palatal epithelial cell cultures resulted in increased numbers of chromosomal aberrations. At the lowest level used (IR), aberrations occurred of the type produced by two breaks such as chromatid exchanges, dicentrics, and metacentrics.
Assuntos
Aberrações Cromossômicas , Cromossomos/efeitos da radiação , Epitélio/ultraestrutura , Palato/ultraestrutura , Animais , Células Cultivadas , Camundongos , Mucosa Bucal/ultraestrutura , Doses de Radiação , Raios XRESUMO
Twenty-four orthodontists were asked to provide a treatment plan for a series of six cases of malocclusion. In certain types of cases there was high or total agreement on treatment planning whether or not a cephalometric radiograph and analysis was available. In view of these findings, it may be appropriate for orthodontists to reassess their routine use of cephalograms.
Assuntos
Cefalometria , Má Oclusão/terapia , Planejamento de Assistência ao Paciente , Humanos , Má Oclusão/diagnóstico , Extração SeriadaRESUMO
A number of base metal and low gold-content alloys were evaluated in hamster cheek pouches for biocompatibility. No adverse weight changes and no abnormal behavioral patterns were noted in any of the test groups over the 14-day period of the study. Gross examination of the cheek pouches containing the alloys was no different from that of the controls. None of the alloys tested showed significant adverse histopathologic reactions. The recorded changes in incidences and degree of response were essentially no different from those of the negative control material.
Assuntos
Materiais Biocompatíveis , Ligas Dentárias , Ligas de Ouro , Animais , Cricetinae , Feminino , Mesocricetus , Mucosa Bucal/anatomia & histologia , Mucosa Bucal/cirurgiaRESUMO
During the last one-third of their gestational period, lathyritic rats incorporate significantly lower amounts of Sr85 as revealed by whole body counting techniques. This difference was maximum at term. The study provides evidence for lathyritic disturbance in the initial phases of mineralization of hard tissue matrices.
Assuntos
Colágeno/metabolismo , Doenças Fetais/metabolismo , Latirismo/metabolismo , Radioisótopos de Estrôncio , Animais , Desenvolvimento Ósseo , Calcificação Fisiológica , Feminino , Doenças Fetais/fisiopatologia , Idade Gestacional , Latirismo/fisiopatologia , Masculino , Gravidez , RatosRESUMO
The requirements of endosteal dental implants are unique and stringent. The materials currently applied to implantation do not offer convincing evidence of satisfying these needs. This preliminary study reports on attempts at developing materials which would aid in obtaining a mucosal seal to maintain the integrity of the osseous, periosteal, and submucosal compartments from the oral environment and the attachment to bone as related to stress distribution. The materials that were under study were ceramic bonded to base metals and Dacron.
