Autotrasplante de caninos superiores incluidos. Resultados tras 18 años de experiencia / Autotransplantation of upper embedded canines. Result obtained during our 18 years of experience

Se presentan los resultados obtenidos tras 18 años de experiencia en autotrasplante de caninos superiores incluidos. Se explican en detalle las indicaciones, técnica quirúrgica y resultados, concluyendo que a la vista de éstos, la manipulación quirúrgica de caninos retenidos sanos tiene un alto porcentaje de éxito a largo plazo

We present the result obtained during our 18 years of experience in autotransplantation of upper canines. Detailed explanation is given regarding the surgical indications, techniques indications, tecniques an results, In view of this, a conclusion is reached regarding the high, long-term sucess rate of surgical manipulation of embedded, healthy canines

Muscle arrangement in the initial portion of the canaliculi lacrimalis / Disposición de los músculos en la porción inicial de los canaliculi lacrimalis

The vertical portion of the canaliculi lacrimalis is surrounded by a muscular framework with the morphology of a sphincter. This framework is built from three different components: a first component of vertical direction placed in front, laterally and dorsally to the vertical portion of the canaliculi, which proceeds from the external face of the os lacrimale and belongs to the pars lacrimalis (pars lacrimalis, fasciculus coronalis); a second component of transversal-lateral direction, which derives from the crista lacrimalis posterior and belongs to the pars lacrimalis (pars lacrimalis, fasciculus caudalis); and a third component of transversal-medial direction, which proceeds from the ligamentum palpebrale laterale and belongs to the pars ciliaris of the musculus orbicularis oculi. The synchronized contraction of these muscular fibres performs a collapsible function on the initial portion of the canaliculi lacrimalis (AU)

La porción vertical de los conductos lagrimales está rodeada por una red muscular que tiene la morfología de un esfínter. Esta red está construida por tres componentes distintos: un primer componente de dirección vertical, localizado delante, lateralmente y dorsalmente a la porción vertical de los conductos, la cual pasa desde la cara exterior del hueso lagrimal y pertenece a la porción lagrimal (porción lagrimal, fascículo coronal); un segundo componente con una dirección transversal-lateral, que deriva de la cresta lagrimal posterior y que pertenece a la porción lagrimal (porción lagrimal, fascículo caudal); y un tercer componente con dirección transversal-medial, que surge del ligamento palpebral lateral y que pertenece a la porción ciliar del músculo orbicular de los ojos. La contracción sincronizada de estas fibras musculares lleva a cabo una función abatible sobre la porción inicial de los conductos lagrimales (AU)

Influence of osteoporosis on osseointegration: an experimental study / Influencia de la osteoporosis en la oseointegración: estudio experimental

The purpose of the present study was to evaluate the quality of osseointegration in osteoporotic animals, receiving implants with hydroxyapatite coating. Wistar rats. aged 20 weeks were used. Two groups, control and experimental, were established. The second group was subjected to bilateral ovariectomy to induce osteoporosis. Both groups received intramedullary implants in one of their femora at the age of 36 weeks, the other femur remaining without implant, 12 weeks later, all the animals were sacrificed. Densitometric, histological and morphometric analyses were performed. All the results confirmed a poorer bone response to the implant in the osteoporotic group. However, the bone mineral density and morphometrical values for the implanted osteoporotic group were higher than those observed for the osteoporotic group without the implant, suggesting that the implant stimulates new bone formation and slows down the process of osteoporosis (AU)

El objetivo de este estudio ha sido evaluar la calidad de oseointegración en animales osteoporóticos que recibieron implantes con un revestimiento de hidroxiapatita. Se utilizaron ratas de la cepa Wistar, de una edad de 20 semanas. Se establecieron dos grupos: el control y el experimental. Para inducir la osteoporosis, los animales del segundo grupo fueron sometidos a ovariectomía bilateral. Simultáneamente, ambos grupos recibieron implantes intramedulares en uno de sus fémures a la edad de 36 semanas, quedando el otro fémur sin implante. A las 12 semanas fueron sacrificados todos los animales. Se llevaron a cabo análisis densitométricos, histológicos y morfométricos. Todos los resultados confirmaron una peor respuesta ósea al implante en el grupo de animales osteoporóticos. No obstante, los valores respecto a la densidad mineral del hueso así como los morfométricos encontrados en los animales del grupo osteoporótico eran más altos que aquellos observados en el caso del grupo osteoporótico sin implantes, sugiriendo que el implante estimula la formación de hueso nuevo y que ralentiza el proceso de osteoporosis (AU)

Behavior of rabbit dental tissues in heterospecific association with embryonic quail ectoderm.

The behavior of dental tissues from the rabbit, Oryctolagus cuniculus, in association with epithelium from the quail, Coturnix coturnix japonica, has been examined. Adult and embryo rabbits were employed in this study. Dental papillae from teeth at the cap stage from rabbit embryos and dental pulp from adult rabbits were isolated surgically and recombined with skin ectoderm from 72-hour-old quail embryos. The recombined tissues were cultured for 48 hours on semi-solid medium and subsequently removed and placed on chorio-allantoic membranes of 7-day-old chick embryos. Control cultures (dental pulp, dental papillae, and quail ectoderm) showed regression, atrophy, or differentiation according to the phenotype of the tissue. After 8 days in explant culture, heterologous recombinants composed of dental papillae and flank skin ectoderm from quail embryos developed differentiated chimeric tooth structures. It was unclear whether or not enamel was being secreted. The fact that the interactions between the enamel epithelium and the dental papillae are reciprocal is well known. The differentiation of odontoblasts can only occur in the presence of an enamel organ. Thus, the quail epithelium must have been induced to become an enamel organ, the lack of enamel proteins notwithstanding. Apical pulp and root pulp from adult rabbits plus quail ectoderm showed a high degree of regression and atrophy. At around 15 days of gestation, the rabbit dental papillae at the cap stage have already acquired odontogenic potential. By contrast, under the same experimental conditions, the dental pulp from continuous-growth teeth from adult rabbits did not show odontogenic potential.(ABSTRACT TRUNCATED AT 250 WORDS)

Functional anatomy of the human saccus lacrimalis.

The relations between the saccus lacrimalis and different portions of the musculus orbicularis oculi were studied in orbital regions of human fetuses sectioned into numbered series. No insertions of the pars lacrimalis or Horner's muscle on the saccus were found. These muscular fibres pass along the dorsal wall of the saccus and are separated from it by the reflex tendon of the ligamentum palpebrale mediale. The only muscular fibres that insert on the saccus are those that approach the anterior face of the saccus and the fornix. The fibres that insert on the anterior face proceed from the deep bundles of the pars preseptalis of the lower eyelids, and those that insert on the fornix derive from the deep bundles of the pars preseptalis of the upper eyelid.

Somatostatin content and binding in small intestinal mucosa from fed, fasted, and refed rabbits.

The present study is an investigation of the effects of 12- to 96-hours' starvation and 96-hours' starvation plus 48-hours' refeeding on both somatostatin-like immunoreactivity (SLI) and cytosolic somatostatin binding sites in rabbit small intestinal mucosa. The SLI concentration increased after 24 h in duodenal and jejunal mucosa, but not in ileal mucosa, and reached its highest value after 96 h of fasting. The number of specific high and low-affinity somatostatin binding sites, but not their affinity, decreased with the duration of fasting in the same gut segments, refeeding of fasted animals resulted in a return to normal control values for small intestine mucosal SLI and somatostatin binding.

[Radius of the curvature of the femur in the sagittal plane]. / Radius der Curvatur des Femur in der Sagittalebene.

The degree of anterior curvature was measured on 30 cadaveric human femora, of unknown age and sex, by a spherometer. The mean anterior curvature radius was (1381.28 +/- 118.63) mm with a considerable interspecimen variation, the maximal value was 3262.66 mm and the minimal 695.54 mm.

[Biometry of the tibia]. / Biometrie der Tibia.

This study investigates the relations between 67 tibia parameters. For this investigation, 30 human tibia of unknown sex and age were examined from the bone collection of the Department of Anatomy of the University of Alcalá de Henares (Madrid). Many tibia parameter relationship were established, which were correlated through statistical analysis. 3 groups of parameters correlations were established: antero-posterior diameters of the diaphysis; perimeters of the diaphysis and width of the proximal extremity of the bone. The authors present the statistical values of all the measurements, which are of great anthropological interest.

Effects of fasting and refeeding on somatostatin concentration and binding to cytosol from rabbit gastric mucosa.

Somatostatin like immunoreactivity and the density of somatostatin binding sites were measured in stomach (fundus and antrum) from either fed, 12 to 96 hours fasted, or 96 hours fasted plus 48 hours refed rabbits. The somatostatin concentration increased in fundic and antral mucosa after 24 h and reached its highest value after 96 h of fasting. The number of specific somatostatin binding sites with high and low affinity decreased with the duration of fasting. Refeeding of fasted animals resulted in a normalisation to control values of gastric mucosal somatostatin and somatostatin binding.

Estudio arquitectural morfo-funcional de la válvula ileo-cecal en el feto y en el recién nacido / Morfo-functional architectural study of the ileocecal valve in fetus and newborn

Se ha realizado un estudio de la ordenación morfo-funcional de la válvula ileo-cecal, a través de la vida fetal, a partir de las 9-10 semanas hasta el recién nacido. Para ello se han utilizado 25 fetos de distintos tamaños comprendidos entre una longitud de 50 mms. y 300 mms. y 10 piezas de recién nacidos. La fijación de dichas piezas se realizó en formol al 10%. Se cortaron las piezas fetales a 15 micras y a 15 y 20 micras las del recién nacido. Las tinciones utilizadas fueron: tricrómico de MASSON, azan, hematoxilina-eosina, orceína y resorcina-fucsina KERNECHKROT. Entre los hechos más significativos que observamos en el desarrollo valvular, la ordenación muscular tanto a nivel de los labios como de sus prolongaciones frenulares se integran en un sistema helicoidal único, respondiendo al tipo de construcción pilórica que DIDIO defiende en sus trabajos del adulto

A study of the nutrient foramina in human long bones.

The present study analyzed the location and number of the diaphysial nutrient foramina in six long bones of adult human skeletons of unknown age and sex from a statistical view point. The diaphysial nutrient foramina in the humerus, are located at between 50 and 65% of the total length; in the radius and ulna, at between 25 and 50%; in the femur, at between 25 and 58%; in the tibia, at between 30 and 40%; and in the fibula at between 35 and 67%, i.e. the middle third of the bone. Also studied were the anatomical position and number of the diaphysial nutrient foramina in each bone.