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At least 667 records · Page 37Linked to original sources
PubMed1991

Lymphatic valves of the rat pancreas.

The detailed structure of pancreatic lymphatic valves in rats was examined in an attempt to identify ultrastructural features that could be correlated with the ability of these delicate structures to withstand retrograde flow. Sprague-Dawley rats were perfusion-fixed and the pancreas processed for light and electron microscopy. Lymphatic vessels were identified by their typical appearance coupled with the presence of valves within their lumen. These valves were consistently formed of cuspid leaflets joined to the lymphatic wall at the bases and sides enclosing valvular pockets or sinuses between cusp and wall. Each cusp or leaflet consisted of two simple squamous endothelial layers separated by a connective tissue core and thus appeared, at first sight, as a simple infolding of the lymphatic vessel lining with its underlying connective tissue. However, certain differences were seen. Frequently the free margins of the cusps, instead of being smooth as might be expected, exhibited endothelial extensions or processes which were arranged in such a way that they could interdigitate with similar extensions on the opposing cusps and thus aid in closure of the valves. A striking difference between the endothelial lining of the vessel and that of the cusp was the presence of a distinct and almost continuous basal lamina underlying the endothelial cells which lined the surface of the cusp facing the valve pocket. The opposing surface of the cusp, which faced the central lumen was similar to the typical lining of lymphatics in showing little or no basal lamina.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1991

[Aortic insufficiency and septal hypertrophy in a boy with Down's syndrome].

A 9-year-old boy with Down's syndrome and aortic regurgitation. In this patient bicuspid aortic valve and rheumatic fever could not be proved. On echocardiography, basal septal hypertrophy with significantly protrusion into the left ventricular outflow tract was observed. It could explain the aortic regurgitation by ejection flow eccentrically directed to right coronary cuspid, causing a jet lesion.

Aortic Valve Insufficiency↗
PubMed1991

Osseointegrated implants in the oral habilitation of a boy with ectodermal dysplasia: a case report.

The most characteristic oral feature in ectodermal dysplasia is hypodontia. Children and adolescents suffering from ectodermal dysplasia often need extensive and complicated prosthetic treatment. The development of techniques for osseointegrated implants offers new possibilities for the oral habilitation of these children. This paper describes the oral habilitation of a boy with severe ectodermal dysplasia and where Brånemark osseointegrated implants have been used as part of the treatment. The patient was seen at the dental department at the age of 1.5 years. Two conically-shaped upper incisors were at that time the only teeth that had erupted. The treatment was planned in a multidisciplinary odontological group involving paediatric dentistry, orthodontics, prosthodontics, oral surgery and maxillofacial radiology. At the age of 3 years it was verified that the boy had four primary teeth (53, 51, 61, 63) and four permanent teeth (16, 11, 21, 26). There were no teeth in the lower jaw. The alveolar ridges in the edentulous areas were low or missing. During the period 3-6 years of age the boy used an upper partial denture adapted to allow the mesial drift of the 16 and 26 teeth. At the age of 6 years, two Brånemark implants were inserted in the lower front-cuspid region. A specially designed overdenture for the lower jaw was constructed. The overdenture was retained in contact with the male attachments by two cuffs of heat-polymerized resilient silicone. Over the next 4 years the dentures were modified due to the eruption of permanent teeth and growth. However, only minor corrections were necessary concerning the retention system of the lower denture. The implants are well osseointegrated and stable and allow the boy to use a lower denture without any complications.

Anodontia↗
PubMedDate not supplied

[Distalization of molars with magnets: biomechanical considerations].

Repelling magnets have recently been proposed to move maxillary molars distally. Although the technique presents some clinical indications, the biomechanics of tooth movement with magnets has not been clearly investigated. The results of the Author's experience suggest that the repelling magnets mainly generate a tipping movement of the crowns on the sagittal plane. The distal-tipping of the molars represents almost 50% of the total effect, the mesial tipping of the bicuspids-cuspids-incisors constitutes the remaining 50%. Also, on the horizontal plane, the force generated by the magnets tends to rotate the crowns of the molars palatally.

Adolescent↗
PubMedDate not supplied

[Deep bite correction in adult patients].

Excessive occlusal force caused by deep bite is an etiology of alveolar bone resorption as well as premature loss of permanent teeth. Deep bite correction in adult patients should comprise of intrusion and/or proclination of anterior teeth in order to prevent skeletal alteration and relapse. The objective of the article was to present indication and mechanics of intrusion and proclination of anterior teeth with a case report of the patient who had a problem of masticatory system especially temporomandibular joint, cuspid protection system and deep bite.

Adult↗
PubMed1991

Effects of warm air-drying on intra-pulpal temperature.

This study was designed to determine what effects different warm air-drying conditions have on the intra-pulpal temperature (IPT), with or without chamber preparation and with or without an acid-etching treatment of the enamel. Four human maxillary centrals and four cuspids had lingual access openings prepared to accommodate a thermal sensor probe. Half of the specimens received a labial chamber preparation and half were acid-etched. All specimens were stored in water at 37 degrees C prior to testing. Labial aspects were positioned at 2 cm and 6 cm from the nozzle of a 500W hair dryer and IPTs were recorded after 15, 30, 45, and 60-second exposures. Exposure times for the acid-etched samples were modified to 10 seconds at 2 cm and 15 seconds at 6 cm. Results showed that for unetched teeth, increases in the IPT were greater at the 2 cm/15-second exposure (a 10.4-12.0 degrees C increase) than at the 6 cm/15-second exposure (a 3.9-6.6 degrees C increase). Even greater temperature changes were seen as the exposure times were increased to 30, 45, and 60 seconds. When the teeth were acid-etched, IPT rises of 5.6-10.1 degrees C and 5.8-8.7 degrees C were measured at 2 cm/10 seconds and at 6 cm/15 seconds, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Acid Etching, Dental↗
PubMed1991

Heterogeneity of the myocardium. Function of the left and right ventricle under normal and pathological conditions.

A number of important differences can be found between the left ventricle (LV) and right ventricle (RV) of the heart under physiological conditions. In anatomy, the most important is probably the architecture of the atrioventricular valve and its annulus. The LV has a mitral valve (with two cusps) and a firm annulus, while the RV has a tricuspid valve with a greater total area, but relatively small cuspid areas, and an elastic annulus. The difference in the blood supply is important. Owing to high intramural pressure, the coronary flow in the wall of the LV occurs only during the diastole; in the RV it is limited only in the presence of a significant increase in intracavitary pressure. The LV myocardium is functionally "accustomed" to short-term marked changes in the systolic load (in extreme static exercise the arterial pressure rises for a short time to three times the normal value), while the RV is adapted to changes in the diastolic load (marked filling changes associated with deep breathing, for instance). The difference in the response to a long-term volume load is difficult to evaluate: between a defect of the interatrial septum and aortic insufficiency there are too many differences. A long-term pressure load seems to be tolerated better by the right ventricle: patients with severe pulmonary stenosis and a pressure six times higher than the physiological value have lived 25 years and patients with isolated corrected L-transposition of the great arteries can reach 35 years without any signs of impaired RV function.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1991

[The clinico-radiological assessment of dental anomalies with real and apparent numerical defects].

Dental anomalies involving real shortfall in the number of teeth (agenesis) or apparent deficiency (impaction) have been studied in a population sample including 700 national servicemen aged between 19 and 26, in the period April-August 1989. The study was carried out by means of careful objective examination and the systematic performance of orthopantomography showed that 5.14% of the population examined is affected by dental agenesis. The tooth most often involved in agenesis is the lateral maxillary incisor followed by the third mandibular molar, the second mandibular premolar and the second maxillary premolar. As regards apparent agenesis, the upper and lower wisdom teeth were the most frequently involved in physiological or pathological bone impaction (this event occurs in almost 50% of third molars). The maxillary cuspid is also impacted with some frequency. The data obtained were compared with those in the world literature.

Adult↗
PubMed1991

[Treatment of gingival recession with a coronally repositioned flap].

The treatment of an exposed root surface may be indicated for an aesthetic improvement of a gingival recession. The surgical technic depends on the type of the recession, the quality and the quantity of the keratinized gingiva apically or laterally from the recession. The purpose of this study is to evaluate the minimal quantity of keratinized gingiva necessary to obtain a root coverage. 10 recessions on maxillary cuspids were treated with coronally repositioned flap. Less than 3 mm of keratinized gingiva was present apically to the exposed root surface. All patients received oral hygiene instructions, plaque control and scaling and root planing. Gingival recession, width of keratinized gingiva and loss of attachment were measured at the time of surgery and three months postoperatively. The mean recession was 5.20 mm (+/- SE = 0.36) prior to treatment and the keratinized gingiva was 1.70 mm (+/- 0.16) high at T0. The mean gain of root coverage was 3.43 mm (+/- 0.29) at three months post-operatively. At T0 and 3 months post-operatively, the measures of recessions showed a statistically difference confirming the validity of the technic. The absence of correlation between initial height of keratinized gingiva and the coverage result (r = 0.05) indicates that initial width of keratinized gingiva does not affect the coverage results.

Epithelial Attachment↗
PubMed1991

[Two cases of cardiac injuries due to nonpenetrating trauma of the chest].

Successful repair of nonpenetrating traumatic cardiac injury is uncommon. Two cases of nonpenetrating traumatic cardiac injuries from accident are reported. Case 1. Seventy eight year old man with shock was admitted to Iida City Hospital four hours after getting a bruise by a wood block on the anterior chest wall. Soon after his arrival ultrasonic cardiography was performed because of a doubt of cardiac trauma. And it revealed cardiac tamponade. Then the emergency operation was performed. After pericardial effusion was drained, rupture on the out-flow tract of the right ventricle was found and was successfully repaired without the aid of cardiopulmonary bypass. Case 2. Sixty five year old man with left heart failure was admitted to Iida City Hospital four months after getting a bruise on left chest and back from falling. Chest and back pain was reduced three weeks after the accident, however, shortness of breath was getting worse. Ultrasonic cardiography and aortography showed aortic regurgitation. Under cardiopulmonary bypass aortic valve replacement was performed. His aortic regurgitation was caused by perforation of non-coronary cuspid due to accident. Ultrasonic cardiography is useful to make a diagnosis of nonpenetrating traumatic cardiac injury. It is necessary to operate as soon as possible in cardiac rupture, and to select valve replacement for aortic regurgitation.

Accidents↗
PubMed1990

Cross-sectional study to evaluate variations in attached gingiva and gingival sulcus in the three periods of dentition.

The dimensional differences of the attached gingiva and gingival sulcus in the primary, mixed and permanent dentition were studied clinically in normal gingivae of 382 children, aged 4-15 years. The depth of the gingival sulcus and the width of keratinized gingiva were also measured. Shallow gingival sulcus was observed in the primary dentition as compared to that in permanent dentition. However, in the mixed dentition deeper sulcus was observed around the newly erupted teeth. This was attributed to deeper penetration of the instrument, at the time of eruption. The widest zone of attached gingiva was observed in maxillary and mandibular incisors, decreasing gradually over the cuspids and first premolars (first primary molars), and again attached gingiva increased in second premolars (second primary molars) and first and second permanent molars. The width of attached gingiva in case of newly erupted permanent teeth (mixed dentition) was narrower in the corresponding primary teeth. This was due to an increase in the gingival sulcus depth. The attached gingiva increased in width with age. This was related to a concomitant reduction in sulcus depth.

Adolescent↗
PubMed1990

[Application of composite resin inlays to deciduous molars--a clinical observation of the resin onlay].

Although composite resin has been used as an aesthetic restorative material, wear and fracture of the resin of fracture of the tooth structure are likely to occur when the size of the dental cavities are large. In addition to the lack of the aesthetic value, clinical results of prefabricated metal crown revealed several problems which were caused by the wear of the metal and the ill-adaptation of the cervical margin. In the present study, 50 devitalized deciduous molars were treated with composite resin onlays which were designed to cover the entire occlusal surface of the deciduous molar, and the clinical results were evaluated for a 6 month period. Additionally, for the purpose of simplification of the laboratory process for making resin onlays, ready-made occlusal shells were fabricated. The variety of the prepared shell size consisted of 7 sizes for the first deciduous molar, 9 sizes for the upper second deciduous molar and 10 sizes for the lower deciduous molar. The following results were obtained. 1) A partial resin fracture at the peripheral area of the mesio-buccal cuspid was found in five cases out of 50. 2) A glossy appearance on the surface of the onlay which was created by coated unfilled resin disappeared after 6 months of observation. 3) In relation to the resin onlay, when the antagonistic tooth was restored with prefabricated metal crowns, holes were made by attrition on all the crowns within a 3-4 month period.(ABSTRACT TRUNCATED AT 250 WORDS)

Child↗
PubMed1990

[Statistical studies on numerical anomalies of teeth in children using orthopantomograms. Hyperdontia].

Statistical studies on numerical anomalies of teeth using orthopanthomograms had been attempted. In this paper, hyperdontia had been researched using 4009 orthopanthomograms of pedodontic patients. The tested were following: Male: Age 2-5 1036, 6-11 905, 12-22 Total 1963 Female: Age 2-5 1032, 6-11 985, 12-29 Total 2046 respectively. And 119 hyperdontia cases (143 teeth -1 tooth: 95 cases, 2 teeth: 24 cases) were found. Male: 84 cases 104 teeth (1 tooth: 64 cases, 2 teeth: 20 cases) Female: 35 cases 39 teeth (1 tooth: 31 cases, 2 teeth: 4 cases). Form supplemental teeth (normal form) deciduous teeth 4 teeth (4 anteriors containing 2-3 C in a case.) permanent teeth 32 teeth (anteriors: 28, premolars: 4) supernumerary teeth (abnormal form) deciduous cuspid like, conical 97 teeth (upper incisors) queer form 10 teeth (upper anteriors) Eruption line normal 85 teeth inversive 46 teeth horizontal 12 teeth Depth in alveolus Hyperdontia are classified in following: 1. in the alveolus deeper than permanent dentition in deciduous teeth period type I 1.7% in permanent teeth period type I' 23.5% 2. in the same depth of permanent dentition in deciduous teeth period type II 24.4% in permanent teeth period type V 9.2% 3. in the depth between permanent dentition and deciduous dentition type III 38.7% 4. in the deciduous dentition type IV 3.4% Type I, Type I', and Type III (total 63.9%) possibly belong to different teeth generation from deciduous and permanent teeth.

Child↗
PubMed1990

[Relationship between transversal joint guidance and buccal curve morphology].

The relationship between the morphology of the curvature of laterotrusion facets and tooth-guided tracings of the mediotrusive condyle path was studied in 20 probands with normal function. The varying inclinations of the dominant laterotrusion facets in cuspid-protected or group-guided occlusion has no bearing on the angle of the mediotrusive paths relative to the horizontal plane. The morphology of the buccal curve allows no predictions as to the direction of the mediotrusive path curvature. Only the movements of the idling condyle were influenced by the type of occlusal guidance. In lateral excursive movements of the mandible with the teeth in contact group-guidance frequently resulted in an upward movement of the laterotrusive condyle and thus to a compression of the intraarticular soft tissues. Although valid conclusions regarding any type of interdependence are impossible unless we are able to measure real tooth and joint movements simultaneously, the results of our study contradict other hypotheses at any rate.

Dental Occlusion, Balanced↗
PubMed1990

[Influence of functional therapy on the gingival recession in patients with wedge shaped defects. A 2.5-year longitudinal study of the etiology of periodontal atrophy].

In 20 patients a free way space of greater than or equal to 1.0 mm and a cuspid protected guidance was formed. A previous study has shown, that prematurity and defective contacts reduce the free way space step by step and induce an artificial clenching. The front teeth was relieved in intercuspal position. The increase sof gingival recessions at the upper jaw was over five times significant slighter in treated patients than one in the 22 men of the control group. There was no significant, differences in the lower jaw. The recessions are represented as a sequence of a chronic biomechanical overloading.

Adult↗
PubMed1988

[Microrelief of the internal surface of the thoracic duct in dogs (based on scanning electron microscopy data)].

The investigation has been performed on 17 mature dogs. With the aim to investigate the internal surface of the thoracic duct, the methods of scanning electron microscopy of native, impregnated and corrosive preparations have been used. The analysis of the scannograms obtained demonstrates that the valves of the thoracic ducts are mainly bicuspid, have a typical infundibular form, their cuspides are fused, forming a mesentery-like fold on the duct wall. It plays the main role in ensuring unilateral transport of lymph. The microrelief of the thoracic duct endothelium possesses a rather complex organization. The following relief formations are distinguished in endotheliocytes: 1. nuclei-containing eminence, 2. marginal processes, 3. separate microvilli. The dependence of the microrelief on arrangement of endothelial cells in the valvular area or intervalvular fragments is noted. This is also concerned orientation of endotheliocytes; therefore, predominance of stretched endotheliocytes of the postvalvular fragment can be connected with demonstration of viscous friction force in the lymph stream, that produces deforming and orienting influence on the endotheliocytes.

Animals↗
PubMed1989

[Clinical studies on 16 cases of odontoma in children].

16 cases of odontoma (male: 12, female: 4) in young patients from 1 year 2 months to 14 years of age at the Pedodontic Clinic of Niigata University Dental Hospital in a recent 9 year period were investigated clinically. As for the pathologic histology, 12 cases were of the compound type, 2 were of the complex type, 1 was of the intermediate type between compound and complex, and 1 was of ameloblastic fibro-odontoma type. 9 cases occurred in the maxilla, 7 cases occurred in the mandible. Most of the compound type were observed in the area of the maxillary incisors and cuspids, and the complex type cases were noted in the anterior part of the maxilla. In many cases, there were clinical symptoms such as retarded eruption. Some cases of odontoma in children were small in scale and showed a low degree of calcification. Therefore they showed a tendency not to be found out at radiography, and it is difficult to diagnose them as odontoma. By finding odontoma prematurely and removing it in time, the retarded eruption teeth were able to erupt spontaneously or to be guided to a normal position.

Child↗
PubMed1989

[The question of root resorption. Is the risk of root resorption related to the typology of the face?].

The mechanisms involved in root resorption are of the same nature than those leading to bone resorption. The state of calcification and the local conditions in the microenvironment are responsible for the different responses of alveolar bone and root with regard to calcified matrix resorption. Root resorption is commonly observed in association with impacted cuspids, acute chronical trauma, inflammatory or idiopathic conditions. Root resorption is more frequent in females and is independent on facial typology or orthodontic technique. Critical conditions to root integrity are often associated with heavy forces and periodontal ligament disruption. Root anatomy may also be a predisposing factor to resorption. Systematic radiological examination is the only way to control the onset of a root resorption process in orthodontic therapy.

Cephalometry↗