13 research outputs found
Остеопластика альвеолярной части нижней челюсти комбинированными костными трансплантатами
Introduction. There are various osteoplasty methods aimed at managing the challenge of jaw atrophy. When the scope of the osteoplasty is extensive it is not always possible to prepare an appropriate amount of bone tissue without additional surgeries. In some cases there is a lack of intraoral bone tissue sources for this kind of operations. Using extraoral sources of bone tissue is not always justified; it is invasive and patients take longer to recover and return to work. Using alternative sources of bone biomaterials might help establish a less invasive osteoplasty protocol.Goal. To demonstrate the efficiency of alveolar ridge osteoplasty with the application of laminar technique and using various combinations of autograft and allograft tissues.Materials and methods. To achieve the goal set we have examined and treated fourteen patients (N=14) surgically. All patients presented a clinical picture of severe atrophy in dentoalveolar segments 3 and 4, knife-edged ridge, Cawood and Howell class IV–V. Depending on the combination of autograft and allograft biomaterials patients were split into three study groups and one control group.Results and discussion. Positive outcomes for the treatment administered were observed in 13 out of 14 patients. Complications were determined by the lack of soft tissue, exposure of the graft or its suppuration. All the patients in all the groups underwent a control CT which confirmed the bone tissue growth at the area of the augmentation performed.Conclusion. Using the bone biomaterial allograft in combination with autograft bone makes it possible to get good clinical results in all the groups observed. This method may be a method of choice eliminating the additional invasive procedure of bone transplant harvesting; it does, however, require further, more detailed research.Введение. Существуют различные методики остеопластики, решающие проблему атрофии челюстей. При больших объемах костной пластики не всегда удается произвести взятие должного объема костной ткани без дополнительных хирургических вмешательств, а в некоторых случаях встречается и недостаток внутриротовых источников костной ткани для выполнения данных операций. Использование внеротовых источников костной ткани не всегда оправдано и несет большую инвазию, после которой пациенты временно теряют трудоспособность. Использование альтернативных источников костных биоматериалов могло бы способствовать реализации менее инвазивного протокола остеопластики.Цель. Показать эффективность остеопластики альвеолярного гребня с использованием ламинарной техники и применением различных комбинаций аутогенных и аллогенных трансплантатов.Материалы и методы. Для решения поставленной цели исследования нами было обследовано и проведено хирургическое лечение пациентов (N = 14), у всех пациентов клинически в 3-м и 4-м зубочелюстных сегментах наблюдается выраженная атрофия, саблевидный гребень, 4–5-й класс по Cawood&Howell. В зависимости от сочетания аутотрансплантатов и аллогенных биоматериалов в тех или иных вариациях пациенты разделены на 3 основных и 1 контрольную группы.Результаты и обсуждение. Положительный результат проведенного лечения наблюдался у 13 пациентов из 14. Осложнения были связаны с недостатком мягких тканей, оголением трансплантата или его нагноением. Пациентам всех групп была сделана контрольная КТ, которая показала увеличение объема костной ткани в области аугментации.Заключение. Использование аллогенных костных биоматериалов в комбинации с аутокостью позволяет добиться хороших клинических результатов во всех группах наблюдения. Данный метод может являться методом выбора и исключает дополнительную инвазивную процедуру взятия костного трансплантата, однако требует дальнейшего более подробного изучения
Alveolar Mandible Osteoplasty with Combined Bone Transplants
Introduction. There are various osteoplasty methods aimed at managing the challenge of jaw atrophy. When the scope of the osteoplasty is extensive it is not always possible to prepare an appropriate amount of bone tissue without additional surgeries. In some cases there is a lack of intraoral bone tissue sources for this kind of operations. Using extraoral sources of bone tissue is not always justified; it is invasive and patients take longer to recover and return to work. Using alternative sources of bone biomaterials might help establish a less invasive osteoplasty protocol.Goal. To demonstrate the efficiency of alveolar ridge osteoplasty with the application of laminar technique and using various combinations of autograft and allograft tissues.Materials and methods. To achieve the goal set we have examined and treated fourteen patients (N=14) surgically. All patients presented a clinical picture of severe atrophy in dentoalveolar segments 3 and 4, knife-edged ridge, Cawood and Howell class IV–V. Depending on the combination of autograft and allograft biomaterials patients were split into three study groups and one control group.Results and discussion. Positive outcomes for the treatment administered were observed in 13 out of 14 patients. Complications were determined by the lack of soft tissue, exposure of the graft or its suppuration. All the patients in all the groups underwent a control CT which confirmed the bone tissue growth at the area of the augmentation performed.Conclusion. Using the bone biomaterial allograft in combination with autograft bone makes it possible to get good clinical results in all the groups observed. This method may be a method of choice eliminating the additional invasive procedure of bone transplant harvesting; it does, however, require further, more detailed research
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Tree-ring Reconstruction of Bark Beetle Disturbances in the Picea schrenkiana Fisch. et Mey. Forests of Southeast Kazakhstan
Ips hauseri Reitter is the most important bark beetle on Picea schrenkiana in southeast Kazakhstan, but its biology, ecology, and outbreak dynamics are poorly known. We dendrochronologically reconstructed a 200-year history of disturbances in the Kazakh Tien Shan P. schrenkiana forests. Only localized, low-severity bark beetle events occurred during the reconstructed period, indicating that extensive high-severity bark beetle outbreaks have not occurred historically in the Tien Shan spruce forest, unlike bark beetle outbreaks in spruce forests in North America, Europe, and Russia. Disturbance frequency doubled after about 1965, probably due to warming climate. Results, combined with the failure of an outbreak to fully develop after blowdown events associated with hurricane-force windstorms in 2011, indicate that prolonged drought may be necessary to sustain I. hauseri outbreaks, or that year-to-year variation in the Tien Shan weather prevents outbreak development. I. hauseri is probably less aggressive than I. typographus, at least on their natural hosts within their natural ranges.FST Award of the Science Committee of Ministry of Education and Science, Republic of Kazakhstan [055, 309]; NSF BCS-Archaeology and Archaeometry [1122359]Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
An Approximate Analytical Solution of the Problem of Fluid Filtration in the Multilayer Porous Medium
Mark Alexandrovich Krasnosel'skii, (April 27, 1920 - February 13, 1997)
On February 13, 1997, the world famous mathematician, Mark Alexandrovich Krasnosel'skii, died unexpectedly. This article gives a brief overview
of his life and research