نتایج جستجو برای: resorption
تعداد نتایج: 12129 فیلتر نتایج به سال:
Responses of plant nutrient resorption to phosphorus addition in freshwater marsh of Northeast China
Anthropogenic activities have increased phosphorus (P) inputs to most aquatic and terrestrial ecosystems. However, the relationship between plant nutrient resorption and P availability is still unclear, and much less is known about the underlying mechanisms. Here, we used a multi-level P addition experiment (0, 1.2, 4.8, and 9.6 g P m(-2) year(-1)) to assess the effect of P enrichment on nutrie...
During orthodontic treatment, root resorption can occur unexplainably. No clear distinction has been made between resorption located within specific regions and resorption occurring generally in the dentition. The purpose is to present cases with idiopathic (of unknown origin) root resorption occurring regionally. Two cases of female patients, 26 and 28 years old, referred with aggressive root ...
Idiopathic condylar resorption almost exclusively affects women. Its exact etiology and pathogenesis remain unclear. It has been associated with rheumatoid arthritis, temporomandibular joint internal derangement, condylar fractures, connective tissue or autoimmune diseases, orthodontic treatment, and orthognathic surgery. In most cases, however, there is no identifiable precipitating event, hen...
Sulfate is an important nutrient and enzyme cofactor. Blood sulfate depressed for individuals with autism, partly due to poor resorption in the kidney. We model kidney nephron using simple mathematics examine flowrates, concentrations along length of proximal tubule. Three math experiments are performed our model. Assuming constant resorption, NaS1 transport protein density examined.
objectives: the purpose of this study was to evaluate whether intra-canal application of controlled direct electric current (dec) could accelerate the amount of orthodontic tooth movement (otm) in young adult mixed breed dogs. methods: fourth premolars of both jaws of five young adult mixed breed dogs were divided into two groups of control and experimental groups. orthodontic force was applied...
Internal root resorption is a relatively unusual resorption that begins in the root canal and destroys surrounding dental hard tissues. Multinuclear Odontoclastic cells are responsible for the resorption, which can grow and may perforate the root if left untreated. Internal root resorption is usually asymptomatic, but sinus tract usually forms in case of perforated type of internal resorption. ...
OBJECTIVES To investigate root resorption after 6 months of active orthodontic treatment and its relation to possible risk factors. MATERIALS AND METHODS Ninety-seven patients (10-18 years) with a Class I malocclusion and crowding treated with fixed appliance and premolar extractions were examined with cone beam computed tomography before and after 6 months of active treatment. The exposure c...
The purpose of the study was to characterize root surface alterations in orthodontically moved teeth. Thirty-six 40-50-day-old male Wistar rats were used. The maxillary right first molar was mesialized by means of a fixed appliance, exerting 50 g of force upon insertion. One, 2 and 4 days after force application the animals were sacrificed (nine animals per observation period) and block section...
Osteopontin (OPN) was expressed in murine wild-type osteoclasts, localized to the basolateral, clear zone, and ruffled border membranes, and deposited in the resorption pits during bone resorption. The lack of OPN secretion into the resorption bay of avian osteoclasts may be a component of their functional resorption deficiency in vitro. Osteoclasts deficient in OPN were hypomotile and exhibite...
Root resorption is loss of dental hard tissue as a result of clastic activities. The dental hard tissue of permanent teeth does not normally undergo resorption, except in cases of inflammation or trauma. However, there are rare cases of tooth resorption of an unknown cause, known as "idiopathic root resorption." This report would discuss a rare case of multiple idiopathic resorption in the perm...
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