Letteratura scientifica selezionata sul tema "Alveolar process"
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Articoli di riviste sul tema "Alveolar process"
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Niedzielska, Iwona, Daniel Ciapiński, Michał Bąk e Damian Niedzielski. "The Assessment of the Usefulness of Platelet-Rich Fibrin in the Healing Process Bone Resorption". Coatings 12, n. 2 (14 febbraio 2022): 247. http://dx.doi.org/10.3390/coatings12020247.
Testo completoAbstract (sommario):
The main subject of this research was the use of PRF in dental surgery aimed at preventing changes in alveolar height and width after tooth extraction. Due to the large growth factor content, it seems to be particularly useful in bone loss management starting from the simplest loss occurring after tooth extraction through loss resulting from tooth resection ending with loss caused by large bone cysts. The study was performed on 50 patients. The extraction of two maxillary or mandibular homonymous teeth was carried out in each patient, where PRF was placed in one alveolus while the other alveolus was left empty. Then, the alveoli were surgically managed with a split flap technique. On the extraction day, after 10 days, and after 6 months, the alveolar process was measured, soft tissues healing was assessed, and imaging examinations were analyzed. It was proved that the healing of soft tissues in the PRF group was better. In the PRF group after 6 months from surgery, the newly formed bone had higher grayscale values in volumetric tomography (CBCT). Moreover, the reduced atrophy of the alveolar process at the site of the extracted tooth was proved in this study.
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MISZTAL-KUNECKA, ANNA, ANNA ŁOJSZCZYK e STANISŁAW DZIMIRA. "Evaluation of post-extraction alveolar regeneration time in advanced periodontal disease employing novel hydroxyapatitepolymeric (FlexiOss®Vet) in dogs." Medycyna Weterynaryjna 80, n. 04 (2024): 6867–2024. http://dx.doi.org/10.21521/mw.6867.
Testo completoAbstract (sommario):
The purpose of the study was to demonstrate bone regeneration and the time of formation of new alveolar bone based on implanted FlexiOss®Vet bone substitute material. The study attempted to determine the time taken to fill bone defects with newly formed osseous bone compared to alveoli with a standard method of filling the post-extraction alveolus with a collagen sponge. The study was conducted on a group of 12 dogs with advanced periodontal disease (stage IV) in which polymeric hydroxyapatite bone substitute material (FlexiOss®Vet) was implanted into alveoli on the right side, and collagen sponge was implanted into alveoli on the left side in the same patient. The patients underwent macroscopic inspection and X-ray examination at different periods of regeneration after the procedure. On the right side, macroscopically, the alveoli showed features of marked enlargement, and on X-ray examination they gave opacity to X-rays and there was no clear border between the alveolus and alveolar bone. On the left side, the alveoli were clearly penetrable to X-rays, and hollow alveoli filled mainly with connective tissue were observed. The study also showed a significant reduction in bone healing time in alveoli with implants compared to self-healing alveoli. These results suggest that the implanted material is significantly beneficial in the process of bone regeneration in large bone defects in dogs and notably shortens the process of bone regeneration after tooth extractions. It is presumed that this could reflect a model for the treatment of large bone defects in not only the maxilla and mandible, but also long bones, and that it could be a model for alveolar healing in humans.
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Sukaedi, Sukaedi, e Eha Djulaeha. "Treatment of sharp mandibular alveolar process with hybrid prosthesis". Dental Journal (Majalah Kedokteran Gigi) 43, n. 3 (1 settembre 2010): 136. http://dx.doi.org/10.20473/j.djmkg.v43.i3.p136-140.
Testo completoAbstract (sommario):
Background: Losing posterior teeth for a long time would occasionally lead to the sharpening of alveolar process. The removable partial denture usually have problems when used during mastication, because of the pressure on the mucosa under the alveolar ridge. Purpose: The purpose of this case report was to manage patients with sharp mandibular alveolar process by wearing hybrid prosthesis with extra coronal precision attachment retention and soft liner on the surface base beneath the removable partial denture. Case: A 76 years old woman visited the Prosthodontic Clinic Faculty of Dentistry Airlangga University. The patient had a long span bridge on the upper jaw and a free end acrylic removable partial denture on the lower jaw. She was having problems with mastication. The patient did not wear her lower denture because of the discomfort with it during mastication. Hence, she would like to replace it with a new removable partial denture. Case management: The patient was treated by wearing a hybrid prosthesis with extra coronal precision attachment on the lower jaw. Soft liner was applied on the surface of the removable partial denture. Hybrid prosthesis is a complex denture consisting of removable partial denture and fixed bridge. Conclusion: It concluded that after restoration, the patient had no problems with sharp alveolar process with her new denture, and she was able to masticate well.Latar belakang: Kehilangan geligi posterior dapat menimbulkan processus alveolaris tajam. Gigi tiruan sebagian lepasan mempunyai masalah selama pengunyahan karena adanya tekanan di mukosa di bawah alveolar ridge. Tujuan: Tujuan laporan kasus ini adalah untuk menjelaskan cara menangani pasien yang mempunyai prosesus alveolaris yang tajam di rahang bawah dengan dibuatkan protesis hybrid dengan daya tahan extra coronal precision attachment dan soft liner di permukaan bawah basis gigi tiruan sebagian lepasan. Kasus: Pasien wanita berumur 76 tahun datang di klinik Prostodosia Fakultas Kedokteran Gigi Universitas Airlangga. Pasien memakai gigi tiruan lekat rentang panjang di rahang atas dan gigi tiruan sebagian lepasan akrilik free end di rahang bawah, pasien mengalami masalah waktu mengunyah. Pasien tidak memakai gigitiruan lepasan rahang bawahnya karena tidak nyaman dipakai, dan pasien menginginkan pembuatan gigi tiruan lepasan rahang bawah yang baru. Tatalaksana kasus: Pada pasien ini dilakukan pembuatan Hybrid Prosthesis dengan daya tahan berupa extra coronal attachment di rahang bawah dan penggunaan bahan pelapis lunak yang diaplikasikan pada basis gigi tiruan lepasan nya. Hybrid prosthesis adalah gigi tiruan himpunan yang terdiri dari gigi tiruan lepasan dan gigi tiruan lekat. Kesimpulan: Hasil perawatan menunjukkan setelah mengganti gigi tiruan dengan gigi tiruan sebagian lepasan yang baru, pasien tidak mempunyai masalah dengan gigi tiruan yang baru akibat processus alveolaris yang tajam dan pasien dapat mengunyah dengan baik.
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Аkbarov, Avzal, Jamshid Tulyaganov e Nigora Ziyadullaeva. "DIAGNOSTIC ULTRASOUND CHOOSEOPERA OF THE ALVEOLAR PROCESS, MANDIBLE AND MAXILLA". UZBEK MEDICAL JOURNAL 5, n. 1 (30 maggio 2020): 28–33. http://dx.doi.org/10.26739/2181-0664-2020-5-4.
Testo completoAbstract (sommario):
Dental implantation is an established scientifically grounded method of treating patients with partial and complete loss of teeth. However, the dentist-implantologist often faces the problem of bone tissue regeneration after inflammatory, traumatic diseases and carrying out extraction interventions that lead to its deficiency. Physiological regeneration often does not provide the required volume of new bone. A local bone deficiency makes it difficult to carry out dental implantation
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Ankem, Prasanth Babu, Karuna Sri Vaddi, Supriya Botlagunta, Sai Urmila Talupuru, Nagamalleswari Yamani e Divya Sahithi Ankem. "Gross Anatomical Studies on Facial Bones of the Skull of Indian Mongoose (Herpestes javanicus)". Journal of Advances in Biology & Biotechnology 27, n. 6 (6 maggio 2024): 72–81. http://dx.doi.org/10.9734/jabb/2024/v27i6867.
Testo completoAbstract (sommario):
Maxillae were the principal bones of the upper jaw and carry the upper cheek teeth. The lateral surface of the body just above the upper 3rd or 4th cheek tooth infra orbital foramen is present; the alveolar socket for the canine tooth is located at the junction of the alveolar border of the maxilla and premaxilla. The palatine surface bears an anterior palatine foramen. The alveolar sockets for the last molar tooth were opened into the temporal fossa. Incisive bones showed three alveolar sockets for the upper incisors. The Palatine process was a thin plate that forms the rostral part of the hard palate. Nasal bones do not make any articulation with the maxilla bone. The frontal extremities of the nasal bones are blunt, and two bones together fit into the groove formed by the two frontal bones. The rostral extremities of two bones were free for muscular attachment. Lacrimal bones were articulated dorsally with the orbital plate of the frontal bones, ventrally with the palatine process of the maxilla, rostrally with the caudal border of the maxilla, and caudally with the perpendicular part of the palatine bones. The facial surface extends very little, or not at all, beyond the orbital margin. The orbital surface was small and quadrilateral in outline. Lacrimal Bulla was absent. Zygomatic bones were placed between the lacrimal and maxilla rostrally. The temporal process was long, strongly curved, and forms the bulk of the bone. Between the horizontal and vertical parts of the palatine bones forms the posterior 3/4th of the nasal cavity. The rostral extremity of the pterygoid bones were articulated with the palatine bones, and the posterior extremities were free and carried by the by the hamulus. The rostral extremity of the vomer bone has almost reached the body of the incisive bone. The ventral turbinate is larger than the dorsal one. Two halves of the mandibles were not fused completely. The body presents three alveoli for the lower incisors and one alveolus for the canine tooth. It has six alveoli for the lower cheek teeth. The 5th alveolus was larger than the remaining ones and carries a carnassial tooth.
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Boymuradov, Shukhrat. "Management of maxillary alveolar process fractures". Medical and Health Science Journal 6 (4 aprile 2011): 105–7. http://dx.doi.org/10.15208/mhsj.2010.118.
Testo completo
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Pichelmayer, Margit, Rudolf Mossböck e Helmut Droschl. "Maxillary Segmental Distraction in a Patient with Bilateral Cleft Lip and Alveolus with Subsequent Tooth Transplantation: A Preliminary Case Report". Cleft Palate-Craniofacial Journal 45, n. 4 (luglio 2008): 446–51. http://dx.doi.org/10.1597/07-118.1.
Testo completoAbstract (sommario):
Segmental distraction osteogenesis in the maxillary alveolar process makes it possible to close alveolar clefts in patients with cleft lip and alveolus successfully. Dental spaces occurring in the lateral segment can subsequently be fully closed by transplanting teeth into this area. This new method of treatment is advantageous for patients with broad clefts and multiple missing teeth in the maxilla.
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Bassi, Alessandra, e Izabel Christine Seara. "A produção das fricativas alveolar, ápico-alveolar e palato-alveolar em coda silábica no PB e no PE". Letras de Hoje 52, n. 1 (21 giugno 2017): 77. http://dx.doi.org/10.15448/1984-7726.2017.1.25336.
Testo completoAbstract (sommario):
Neste estudo, são investigadas características acústico-articulatórias da fricativaalveolar [s, z], ápico-alveolar [s, z] e palato-alveolar [S, Z] do português brasileiro e do português europeu, em coda silábica, em dados de informantes nativos de Florianópolis‑SC/BR, Rio de Janeiro-RJ/BR, Erechim-RS/BR, Lisboa/PT, Granjal-Viseu/PT e São Jorge-Açores/PT. É analisada a distribuição das fricativas em coda silábica nos falares das localidades anteriormente citadas, uma vez que é de senso comum que, no português brasileiro, ocorra apenas fricativas alveolares ou palato-alveolares. Os parâmetros investigados foram os picos espectrais das fricativas em questão em confronto com o nível de escolaridade dos informantes. Com base nos resultados, pode-se concluir que o fator escolaridade baixa associado à análise dos valores dos picos espectrais dos segmentos fricativos produzidos no português brasileiro e no português europeu foi crucial para estabelecer uma ligação entre a realização dessas fricativas com o processo de colonização dos pontos geográficos analisados nesta pesquisa.********************************************************************The production of the alveolar, apico-alveolar and post-alveolar fricatives in syllabic coda of BP and EPAbstract: In this study, the acoustic-articulatory characteristics of the alveolar [s, z], apicoalveolar [s, z] and post-alveolar [S, Z] fricatives in syllabic coda of Brazilian and European Portuguese were investigated. Data were supplied by native informants from Florianópolis- SC/BR, Rio de Janeiro-RJ/BR, Erechim-RS/BR, Lisboa/PT, Granjal-Viseu/PT and São Jorge- Azores/PT. Since it is common sense that in Brazilian Portuguese only alveolar or post-alveolar fricatives occur, the distribution of fricatives in syllabic coda in speech samples from the places aforementioned was analyzed. The spectral peaks of the fricatives in relation to informants’ schooling level were the investigated parameters. Based on the present findings, the relation between low schooling and the analysis of spectral peak values of the fricative segments produced in Brazilian and European Portuguese was found crucial for the establishment of alink between the production of these fricatives and the colonization process of the geographic regions included in this research.Keywords: Fricatives; Syllabic coda; Acoustic analysis
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Masna, Z. "GENDER FEATURES OF THE ALVEOLAR PROCESS OF THE UPPER JAW". Clinical anatomy and operative surgery 19, n. 4 (26 novembre 2020): 10–14. http://dx.doi.org/10.24061/1727-0847.19.4.2020.44.
Testo completoAbstract (sommario):
The individual face shape, the ratio of its proportions, the articulation capabilities of each person to a significant extent depend on the characteristics of occlusion and occlusion, in turn, are determined by the size, shape and ratio of dental, alveolar and basal arches. Two of them - alveolar and basal - pass at the corresponding levels of the alveolar areas of the jaws, which means that it is almost impossible to correct them, therefore they play the role of landmarks for setting the dental arch during dental prosthetics. A full-fledged aesthetic and functional restoration of the maxillofacial region after prosthetics largely depends on the dentist taking into account the individual morphological characteristics of the jaws, their cellular areas and specifically the morphometric parameters of the collar and basal arches. In order to determine the possible variants of the shape of the alveolar and basal arches of the upper jaw and the patterns of their ratio during the routine dental examination, 55 people (27 men and 28 women) aged 21-60 years with preserved maxillary dentition were examined. It has been established that the alveolar and basal arches of the upper jaw can have the shape of five geometric shapes: an oval, a semicircle, an ellipse, a trapezoid or a square. In this case, the shape of the collar and basal arches can coincide or be combined in various combinations. The analysis of the obtained results showed that in men the alveolar arch most often had the shape of an oval (70%), in women - an oval or semicircle (43%, respectively). With the aim of possible variants of the alveolar and basal arches form determination and peculiarities of their correlation 55 individuals (27 men and 28 women) in age of 21-60 years with the preserved teeth row were examined during planned dental examination. All examined were patients of the “Dental clinic of dr. Dakhno” (Kyiv). Computer tomographic investigation was made to these patients according to medical indications, scanning was made parallely to the occlusal plane. Image reconstruction was conducted with the use of highly dimentional bone algorithm. Alveolar and basal arch form of the upper jaw were determined on the images. It was established that alveolar and basal arches of the upper jaw can have a form of five geometrical figures: oval, semicircle, ellipse, trapeze or square. Form of the alveolar and basal arches can match or can combine in different combinations. Received results analysis testified that alveolar arch has a form of the oval in men and oval or semicircle – in women. Basal arch in men also most frequently has a form of oval, less often – semicircle, square and trapeze. In women basal arch more often has a form of trapeze or semicircle, less often – oval or square. In men alveolar and basal arches form matched in 41% of cases, in women – only in 31% of cases among total amount of all examined individuals. Most often alveolar and basal arches matched in the form of oval and semicircle, only in one case arches of the trapeze form matched in man, in woman – square form. Maxillary alveolar and basal arches form variants analysis let to determine areas, where distance between alveolar crests was maximal. Most variable this index was in individuals with the oval form of the alveolar arch on the level of 16-26, 17-27 or 18-28 teeth. Peculiarities of the alveolar and basal arches form of the alveolar process of the upper jaw in male and female individuals are characterized with expressed individual variability. These peculiarities consideration during dental prosthesis let avoid series of complications connected with the pressure redistribution on the osseous tissue of the jaws during articulation.
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Saffar, Jean-Louis, Jean-Jacques Lasfargues e Marc Cherruau. "Alveolar bone and the alveolar process: the socket that is never stable". Periodontology 2000 13, n. 1 (febbraio 1997): 76–90. http://dx.doi.org/10.1111/j.1600-0757.1997.tb00096.x.
Testo completoTesi sul tema "Alveolar process"
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Rodrigues, Thaís da Silveira [UNESP]. "Avaliação da dinâmica do processo de reparo alveolar utilizando fluorocromos". Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/88934.
Testo completoAbstract (sommario):
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Diversas metodologias têm sido empregadas no estudo do processo de reparo alveolar. Em razão disso, o propósito deste trabalho é apresentar uma metodologia que possibilite a utilização dos fluorocromos como forma de análise do processo de reparo alveolar. Para tanto, 5 ratos tiveram o incisivo central superior direito extraído. Aos 6 dias foi injetada a calceína, aos 15 dias a alizarina e aos 21 dias a oxitetraciclina. Após 35 dias esses animais foram sacrificados. Obtidas as peças, foi analisado o terço médio do alvéolo. Observou-se predominância de calceína junto à parede lingual, grande quantidade de marcação com alizarina e a marcação da oxitetraciclina em menor quantidade, mostrando que houve menor taxa de mineralização óssea. Este trabalho foi capaz de mostrar a dinâmica do processo de reparo alveolar de forma clara e bastante ilustrativa, além de ser de fácil reprodução e apresentar um custo relativamente baixo.
Several methods have been employed in the study of the alveolar repair process. For this reason, the aim of this study is to present a methodology that allows the use of fluorochromes in the analysis of this process. Thus, 5 rats had their upper right central incisors extracted. At day 6 calcein was injected, at day 15 alizarin was injected, and at day 21, oxytetracycline was injected. After 35 days the animals were euthanized. After the samples were obtained, the middle third of the socket was analyzed. Predominance of calcein was observed next to the lingual wall. A great amount of alizarin staining and a smaller amount of oxytetracycline staining were also observed, showing that there was a smaller rate of bone mineralization. This study was able to show the dynamics of the socket repair process in a clear and illustrative manner, besides being easy to reproduce and relatively inexpensive.
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Rodrigues, Thaís da Silveira. "Avaliação da dinâmica do processo de reparo alveolar utilizando fluorocromos /". Araçatuba : [s.n.], 2005. http://hdl.handle.net/11449/88934.
Testo completoAbstract (sommario):
Resumo: Diversas metodologias têm sido empregadas no estudo do processo de reparo alveolar. Em razão disso, o propósito deste trabalho é apresentar uma metodologia que possibilite a utilização dos fluorocromos como forma de análise do processo de reparo alveolar. Para tanto, 5 ratos tiveram o incisivo central superior direito extraído. Aos 6 dias foi injetada a calceína, aos 15 dias a alizarina e aos 21 dias a oxitetraciclina. Após 35 dias esses animais foram sacrificados. Obtidas as peças, foi analisado o terço médio do alvéolo. Observou-se predominância de calceína junto à parede lingual, grande quantidade de marcação com alizarina e a marcação da oxitetraciclina em menor quantidade, mostrando que houve menor taxa de mineralização óssea. Este trabalho foi capaz de mostrar a dinâmica do processo de reparo alveolar de forma clara e bastante ilustrativa, além de ser de fácil reprodução e apresentar um custo relativamente baixo.Abstract: Several methods have been employed in the study of the alveolar repair process. For this reason, the aim of this study is to present a methodology that allows the use of fluorochromes in the analysis of this process. Thus, 5 rats had their upper right central incisors extracted. At day 6 calcein was injected, at day 15 alizarin was injected, and at day 21, oxytetracycline was injected. After 35 days the animals were euthanized. After the samples were obtained, the middle third of the socket was analyzed. Predominance of calcein was observed next to the lingual wall. A great amount of alizarin staining and a smaller amount of oxytetracycline staining were also observed, showing that there was a smaller rate of bone mineralization. This study was able to show the dynamics of the socket repair process in a clear and illustrative manner, besides being easy to reproduce and relatively inexpensive.
Orientador: Wilson Roberto Poi
Coorientador: Roberta Okamoto
Banca: Ana Maria Pires Soubhia
Banca: Luiz Antônio Salata
Mestre
3
Wong, John David. "Alveolar Osteitis: A Review". Thesis, The University of Sydney, 1993. http://hdl.handle.net/2123/4843.
Testo completo
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Lucato, Adriana Simoni. "Avaliação da morfologia do processo alveolar da sinfise mandibular e da posição do incisivo inferior, na maloclusão classe II, divisão 1". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287930.
Testo completoAbstract (sommario):
Orientador: Maria Beatriz Borges de Araujo MagnaniTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O presente trabalho se propôs comparar e correlacionar a morfologia do processo alveolar da sínfise mandibular com a posição do incisivo inferior, nos padrões mesofaciais e dolicofacias em indivíduos com maloclusão Classe II, divisão 1. Com essa finalidade foram utilizadas 40 telerradiografias, obtidas em norma lateral, todas do mesmo centro radiológico, de jovens leucodermas, brasileiros, de ambos os sexos, com idade média de 12 anos e 2 meses, não submetidos a tratamento ortodôntico prévio a essa pesquisa. A amostra foi dividida em quatro grupos conforme o sexo e o tipo facial, sendo 20 do sexo feminino e 20 do masculino; 20 do padrão mesofacial e 20 do padrão dolicofacial. Foram avaliadas grandezas que indicaram a morfologia do processo alveolar da sínfise mandibular: LSM, L1/2SM, ApII-CV, ApII-CL e LSMAp e que indicaram a posição do incisivo inferior: 1.NB, IMPA, FMIA, assim como a discrepância cefalométrica de Tweed. Os dados obtidos foram submetidos à avaliação do erro do método a qual evidenciou a calibração do pesquisador. A análise estatística dos objetivos foi realizada empregando-se o teste t-Student aos dados das médias aritméticas das grandezas avaliadas nos padrões faciais e em ambos os sexos. As correlações entre as grandezas de avaliação da morfologia do processo alveolar com as de posição do incisivo inferior foram avaliadas empregando-se o índice de correlação de Pearson. Os resultados obtidos considerando um nível de significância de 0,05 (p<0,05), evidenciaram significância estatística as grandezas LSMAp e IMPA, resultando em maior largura do processo alveolar na região do ápice radicular do incisivo inferior no padrão mesofacial, com média de 11,97mm e maior vestibularização do incisivo inferior também no padrão mesofacial, com valor médio de 97,83 graus. Não ocorreu dimorfismo sexual. Nos padrões faciais avaliados e em ambos os sexos ocorreram uma correlação positiva entre a largura do processo alveolar e a vestibularização do incisivo inferior, mais evidente no sexo masculino. Em relação à discrepância cefalométrica de Tweed, para ambos os padrões faciais a discrepância foi negativa e não existiu diferença significante entre os padrões
Abstract: The aim of this study was to compare and correlate symphysis alveolar process to lower incisor position in individuals Class II, division 1 malocclusion, mesofacial and dolichofacial patterns. Fourty standardized lateral cephalograms were taken at the same radiographic center, from brazilian leucoderm youngsters, from both genders, mean age of 12 years and 2 months, who had not been undergone to any orthodontic treatment before this research. The sample consisted of four groups, divided equally according to the gender and facial pattern. Symphysis alveolar process morphology was evaluated by: LSM, L1/2SM, ApII-CV, ApII-CL and LSMAp and the lower incisor position was evaluated by: 1.NB, IMPA, FMIA, and Tweed¿s cephalometric discrepancy. The error of the method was calculated and has not shown statistically significant differences, evidencing the standartization of the method. Student¿s t test was used to compare the groups and the Pearson¿s correlation test was applied to analyze the correlation between symphysis alveolar process morphology and the lower incisor position, in both genders and facial patterns. LSMAp and IMPA showed statistically significant differences between facial patterns, where a narrower alveolar process (x = 11,97mm) and more labially tipped incisors (x = 97,83) (p<0,05) were found in mesofacial pattern. Sexual dimorphism was not observed. Positive correlation between alveolar process width and proinclination of lower incisor was observed in both facial patterns, more evident on the male group. Tweed¿s cephalometric discrepancy was negative in both facial patterns, with no statistically significant differences between patterns
Doutorado
Ortodontia
Doutor em Radiologia Odontológica
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Almeida, Júnior Paulo. "Influência de três hemostáticos tópicos no processo de reparo em feridas de extração dental : análise histológica e histométrica em ratos /". Araçatuba, 2004. http://hdl.handle.net/11449/88932.
Testo completoAbstract (sommario):
Orientador: Osvaldo Magro FilhoBanca: Élio Hitoshi Shinohara
Banca: Celso Koogi Sonoda
Resumo: A hemorragia após extração dental constitui-se em uma das complicações mais freqüentes na prática da cirurgia oral. Devido à dificuldade para se exercer manobras como pinçamentos e ligaduras de vasos neste tipo de hemorragias, existe a possibilidade do preenchimento do alvéolo com materiais hemostáticos de ação tópica. O propósito deste estudo foi analisar a influência de três hemostáticos tópicos (Hemostop®, Pro Tape® e ViscoStat®) na cronologia do processo de reparo em feridas de extração dental por meio de uma análise histológica e histométrica. Para tanto foram utilizados 60 ratos (Wistar) machos divididos em quatro grupos de 15 animais cada. Todos os animais foram submetidos à extração do incisivo central superior direito, seguido ou não da colocação de agente hemostático entre o terço médio e apical do alvéolo dental, e posterior sutura com fio reabsorvível. Em grupos de cinco, os animais foram sacrificados aos 7, 14 e 28 dias pós-operatórios por inalação excessiva de éter sulfúrico. Suas maxilas foram separadas, fixadas em formalina, descalcificadas em EDTA e incluídas em parafina. Foram realizados cortes de 6 æm de espessura e corados com Hematoxilina e Eosina, e Tricrômio de Masson. Após a análise histológica, em microscópio óptico; e histometria óssea, com o software ImageLab, os resultados foram submetidos ao teste não-paramétrico de Kruskal-Wallis. Pela metodologia aplicada foi possível concluir que: 1) houve atraso na cronologia do processo de reparo alveolar em todos os grupos tratados; 2) os materiais analisados provocaram intensa reação inflamatória no tecido adjacente; 3) em todos os períodos estudados (7, 14 e 28 dias), a análise histométrica revelou maior neoformação óssea nos animais do grupo 1 (controle). No entanto, a análise estatística constatou diferença significante (p<0,05) somente no 70 dia,...(Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The hemorrhage after dental extraction is one of the most frequent complications in practice of the oral surgery. Due to the difficulty to exercise maneuvers as arrestty and ligature of blood vessel in this type of hemorrhages, exists the possibility of the filling of the alveolus with hemostatics materials of topical action. The purpose of this study was to analyze the influence of three topical hemostatics (Hemostop®, Pro Tape® and ViscoStat®) in the chronology of the repair process in wounds of dental extraction through a histologic and histometric analysis. For such, 60 male's rats (Wistar) were used divided in four groups of 15 animals each. All the animals were submitted to the extraction of the right superior central incisor, followed or not of the placement of hemostatics agent among the medium and apical third of the dental alveolus, and subsequent suture with reabsorble filament. In groups of five, the animals were sacrificed to the 7, 14 and 28 postoperative days by excessive inhalation of sulfuric ether. Your maxillaries were separate, fixed in formalin solution, decalcified in EDTA and included in paraffin. Cuts of 6 æm of thickness were accomplished and stained with hematoxylin and eosin, and Masson's trichromic. After the histologic analysis, in optical microscope; and histometric bony, with the software ImageLab, the results were submitted to the no-parametric test of Kruskal-Wallis. For the applied methodology it was possible conclude that: 1) there was delay in the chronology of the alveolar repair process in all the treated groups; 2) the analyzed materials instigated a intense inflammatory reaction in the adjacent tissue; 3) in all the studied periods (7, 14 and 28 days), the histometric analysis revealed larger bony neoformation in the animals of the group 1 (control group)...(Complete abstract click electronic access below)
Mestre
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Jabbari, Fatemeh. "Reconstruction of the alveolar process in cleft patients". Doctoral thesis, Uppsala universitet, Käkkirurgi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-282020.
Testo completoAbstract (sommario):
Background. The treatment of patients born with cleft lip and palate has been gradually modified over the years as the surgical procedures have developed and improved. Multidisciplinary team care has evolved and provided improved care with enhanced results. Clefts in the alveolus can be reconstructed by alveolar bone grafting or by periosteoplasty. The main goal is to repair and close the alveolar cleft and create a continuous alveolar processes so that the teeth can erupt. Aims. This thesis has several aims: to investigate the impact of dental status and initial cleft width on the outcome of Secondary alveolar bone grafting (SABG) in patients born with unilateral cleft lip and palate (UCLP) at the 10-year follow-up (Studies I and II); to compare the outcomes of primary periosteoplasty (PPP) with those of SABG in patients born with unilateral cleft lip and alveolus (CLA) (Study III); to evaluate clinical and radiographic conditions and identify factors important for the final treatment outcomes after SABG ( Study IV); to evaluate two radiographic methods, i.e. occlusal radiographs and cone beam tomography (CBCT)) for assessing alveolar bone height ( study IV). Results. In UCLP patients, SABG achieved excellent results in terms of bone height; tended to reduce with time, correlated with dental status and dental restoration factors. Occlusal radiographs correspond well with the CBCT, for evaluating alveolar bone height in cleft area. The width of the initial cleft does not seem to affect the success of SABG. Finally, patients with CLA treated with PPP at the time of lip repair have inferior bone formation outcomes in the cleft area compared with patients treated with SABG at the time of mixed dentition. Conclusion. Poor dental status and malpositioning negatively affect the long-term survival of bone in the alveolar cleft. The initial cleft width affects certain dental status factors. In adults with UCLP, the alveolar bone height in the cleft was correlated to the presence of gingival inflammation and restorations at 20 years follow-up. Specially designed maintenance therapy is beneficial, after complex dental restorations in the cleft area. SABG is preferred to PPP for the reconstruction of alveolar clefts.
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Crout, Richard Morrow. "Timing of alveolar cleft bone grafting in maxillary alveolar cleft defects". Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1446.
Testo completo
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Luvizuto, Eloá Rodrigues. "Co-localização de OPG e RANKL durante o processo de reparo alveolar em ratas ovariectomizadas tratadas com estrógeno ou com raloxifeno /". Araçatuba, 2007. http://hdl.handle.net/11449/89169.
Testo completoAbstract (sommario):
Resumo: Objetivos: Avaliar a interferência da ovariectomia (OVX) e seu tratamento com estrógeno (E2) ou com raloxifeno (RLX) no balanço entre RANKL/OPG na cronologia do processo de reparo alveolar em diferentes períodos (7, 14, 21 e 42 dias) através da imunofluorescência por co-localização e análise histomorfométrica. Materiais e Métodos: Os grupos estudados foram: sham, OVX, OVX+E2, OVX+RLX. Após obtenção dos cortes histológicos corados em hematoxilina e eosina e as reações de co-localização por imunofluorescência de RANKL/OPG, os resultados foram avaliados quantitativamente. Resultados:Aos 7 dias: menor neoformação de trabéculas ósseas,o grupo OVX+RLX apresentou menor valor médio. O grupo OVX apresentou o maior turnover ósseo representado pelas co-localizações de OPG e RANKL. Aos 14 dias o grupo OVX+RLX apresentou menor formação óssea. O grupo sham apresentou intensa atividade celular representada pela alta imunorreatividade à OPG e RANKL observada nas células. Aos 21 dias os grupos experimentais apresentaram maiores níveis de ossificação; não apresentaram diferença estatística. O grupo OVX apresentou o menor turnover ósseo. Aos 42 dias houve diferença estatística na quantidade de formação óssea entre o grupo sham comparado aos demais grupos (p<0,05) e o grupo OVX apresentou o maior turnover ósseo. Conclusão: A ovariectomia atrasou o processo de reparo alveolar e alterou o turnover ósseo. A reposição do estrógeno e o tratamento com raloxifeno melhoraram as respostas, mas não restabeleceram completamente os valores da histometria e da colocalização do grupo sham.Abstract: Objectives: To evaluate the influence of the ovariectomy (OVX), and its treatments with estrogen (E2) or with raloxifene (RLX) on the RANKL/OPG balance during the periods in the chronology of the alveolar wound healing process (7, 14, 21 end 42 pos operative days) in female rats by means of immunocolocalization and histomorphometric analysis. Methods: The studied groups were: sham, OVX, OVX with E2 replacement, OVX with (RLX) treatment. After obtaining the histological tissue pieces colored in hematoxilin and eosin and the immunocolocalization reaction for RANKL and OPG, the results were quantitatively evaluated. Results: At 7 days, was observed lesser neoformed trabeculae bone, the smaller medium value was observed to the OVX+RLX group. The OPG and RANKL immunocolocalization showed larger bone tunover to OVX group. At 14 days there was a larger quantity of neoformed trabeculae bone, the smaller medium value was observed to the OVX+RLX group, the sham group presented an intense cellular activity. At 21 days the experimental groups had a greater ossification levels; no statistical significance was observed. The OVX group had the lowest bone turnover. At 42 days there were statistically differences on the quantity of ossification within sham group compared to the other groups (p<0.05). The OVX group showed the largest bone turnover. Conclusions: Ovariectomy delays the alveolar wound healing process and interferes with the bone turnover. The E2 replacement and the RLX treatment improved the healing but not enough to reach histomorphometric and immunocolocalization valours of the sham group.
Orientador: Roberta Okamoto
Coorientador: Rita Cássia Menegati Dornelles
Banca: Wilson roberto Poi
Banca: Teresa Lucia Lamano Carvalho
Mestre
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Sverzut, Alexander Tadeu 1975. "Avaliação do comportamento clinico e radiografico do cimento de fosfato de calcio como material de preenchimento em cirurgia de elevação do assoalho seio maxilar". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288776.
Testo completoAbstract (sommario):
Orientador: Roger William Fernandes MoreiraTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-11T21:39:41Z (GMT). No. of bitstreams: 1 Sverzut_AlexanderTadeu_D.pdf: 3638330 bytes, checksum: 2872619a12beea0b990ef76ba0cc731a (MD5) Previous issue date: 2008
Resumo: A instalação de implantes na região posterior da maxila várias vezes é confrontada com processos alveolares reabsorvidos, resultantes de uma combinação da pneumatização do seio maxilar, dos efeitos da doença periodontal, e do processo de reabsorção óssea fisiológica resultante da falta de estímulo funcional que sucede as exodontias. A elevação do assoalho do seio maxilar vem sendo praticada desde 1980 com o objetivo de aumentar a altura óssea nessa região para uma reabilitação protética suportada por implantes, e para tal vem sendo utilizados vários materiais de preenchimento. O presente estudo teve como objetivo avaliar clinica e radiograficamente o comportamento do Cimento de Fosfato de Cálcio (CFC) utilizado como material de preenchimento em cirurgias de elevação de seio maxilar. Foram operados 10 pacientes não-fumantes e sem alterações sistêmicas, que necessitavam de enxerto em seio maxilar para futura colocação de implantes osseointegráveis. Após um período que variou de 9 a 16 meses, foi realizada avaliação clínica da área enxertada e biópsia com broca trefina de 2mm de diâmetro, em região adjacente ao eixo do implante a ser inserido. Clinicamente, pôde-se observar que não houve reabsorção/substituição do material por osso, o material ainda encontrava-se presente e bem compacto, porém com extremamente friável. Foi possível na macroscopia visualizar no espécime o osso nascente e sua interface com o material. Apesar de nenhum paciente ter tido complicações pós-operatórias e o material ter apresentado características totalmente biocompatíveis, não foi possível a colocação de nenhum implante nos sítios com o material, devido a não formação óssea e sua facilidade em sofrer friabilidade. Foi possível concluir que o cimento de fosfato de cálcio não promove neoformação ósseas quando utilizado como material de preenchimento para elevações de assoalho de seio maxilar visando à reabilitação com implantes dentários e que a radiografia panorâmica não é um método confiável para avaliar o possível ganho ósseo com o emprego do biomaterial.
Abstract: Implant placement in the posterior maxilla is frequently challenged by resorbed alveolar processes due to a combination of maxillary sinus pneumatization, the effects of periodontal disease and the physiological bone resorption following tooth extractions. The sinus floor augmentation surgery has been performed since 1980 with the purpose of increasing bone height in this region, allowing implant-supported prosthetic rehabilitation. In the literature a various materials are used for fulfilling in the maxillary sinus litf. The present study aimed evaluate radiography and clinically the calcium phosphate cement (CFC) used as material of fulfilling in sinus lift surgery. Ten non-smoking and systemically healthy patients who needed maxillary sinus grafting for the placement of dental implants were operated. In a second surgical intervention, After a period that various of 9 the 16 months, the implant placement was preceded by clinical evaluation and biopsy of the lateral sinus wall using with a 2 mm diameter trefine bur, in the region of the bone wall created in the sinus lift procedure. Clinically, it could be observed that substitution/resorbable of the material for bone did not have, the material still met present and well compact. It was possible to visualize clearly in the specimen the native bone and its interface with the material. Although no patient to have had postoperative complications and the material to have presented biocompatible characteristics, was not possible the placement of the dental implants, which had not the new bone formation. According the methodology applied was possible to conclude that the calcium phosphate cement does not promote new bone formation when used as material of fulfilling sinus lift surgeries aiming the placement of dental implant rehabilitation and that the panoramic x-ray is not a greatest method to evaluate the possible osseous grow with the biomaterial.
Doutorado
Cirurgia e Traumatologia Buco-Maxilo-Faciais
Doutor em Clínica Odontológica
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Bonato, Rafaela Carolina Soares. "Avaliação de marcador biológico salivar para o padrão ósseo alveolar em pacientes obesas mórbidas". Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-07012015-102835/.
Testo completoAbstract (sommario):
O tecido adiposo pode regular o metabolismo ósseo e estar envolvido na fisiopatologia da osteoporose. O presente estudo teve como objetivo verificar a condição periodontal e o padrão ósseo alveolar por meio de índices radiomorfométricos da panorâmica e medidas lineares realizadas em radiografias periapicais, além da análise da leptina como biomarcador em pacientes obesas mórbidas. A amostra foi constituída por 60 mulheres na faixa etária de 20 a 35 anos, sendo divididas em 2 grupos: Grupo Experimental (GE-Obesas de Grau III, IMC >40Kg/m2) e Grupo Controle (GC- Eutróficas, IMC 18,5 a 24,99Kg/m2). Foram avaliadas 30 obesas e 30 eutróficas. Para avaliação antropométrica foi utilizado o IMC e medida da relação cintura-quadril. A condição periodontal destas pacientes foi avaliada por meio de índice de placa de Turesky, profundidade de sondagem, índice de sangramento gengival, nível de inserção clínica e presença de cálculo. O padrão ósseo foi avaliado por meio de análise radiográfica: 2 periapicais da região posterior inferior (direita e esquerda) por meio da técnica do paralelismo, sendo avaliado o padrão trabecular através da escala visual de Lindh e a perda óssea por meio distância da junção cemento-esmalte à crista óssea; e análise da radiografia panorâmica através dos índices radiomorfométricos. A dosagem da leptina salivar foi realizada por meio do ELISA. Foi aplicado o questionário OHIP-14 sobre o impacto das condições bucais na qualidade de vida. Teste t de Student e o Qui-quadrado foram adotados para comparação entre grupos (p<0,05). Entre as pacientes examinadas, foi observado maior índice de placa, de sangramento gengival (ISG) e presença de cálculo em obesas (p<0,05). Além de maior prevalência de sítios com profundidade de sondagem de 3mm e 4mm no grupo das obesas (p<0,05). A perda óssea alveolar foi maior em obesas, porém não foi significativa (p>0,05). Porém, foi significativa em relação ao padrão trabecular, sendo que as obesas apresentaram espaços medulares maiores, denotando osso de menor densidade (p<0,05). Quanto aos índices radiomorfométricos, ambos os grupos apresentaram valores dentro da normalidade. A concentração de leptina salivar foi maior nas obesas (p<0,05). As obesas apresentaram maior impacto da saúde bucal na qualidade de vida, especialmente no domínio de limitação física (p<0,05). Conclui-se que as pacientes obesas apresentaram condição periodontal mais grave, com maior índice de placa, maior profundidade de sondagem, sangramento à sondagem e presença de cálculo. As obesas apresentaram também maior perda óssea e padrão trabecular esparso. Além de maiores concentrações de leptina salivar.Adipose tissue may adjust bone metabolism and can be involved in the pathophysiology of osteoporosis. This study aims to evaluate the periodontal conditions, the bone alveolar pattern through panoramic radiomorphometric indexes and linear measurements on periapical radiographs, as well as analysis of leptin as a biomarker in morbidly obese subjects. The sample consists of 60 women aged 20-35 years, divided into two groups: experimental group (EG- obesity level III, BMI> 40Kg/m2) and control group (CG-eutrophic, BMI 18.5 and 24.99 kg/m2). The sample consists of 30 obese and 30 normal weight. Anthropometric measures were using the BMI and haist-to-hip ratio. The periodontal status was assessed through Turesky´s plaque index, probing depth, gingival bleeding index, clinical attachment level and presence of dental calculus. Bone pattern was evaluated by radiographs: 2 periapicals lower posterior (left and right) through parallel technique, evaluated the trabecular pattern trough visual scale by Lindh and measured linear distances between cement-enamel junction to alveolar crest; and panoramic analysis by radiomorphometric indexes; and measured of salivary leptin by ELISA. The OHIP- 14 questionnaire was applied on the impact of oral conditions on the quality of life. Student´s \"t\" test and Chi-square were adopted for comparison between groups (p <0.05). Among the subjects examined, there was a greater plaque index, gingival bleeding (GI) and presence of calculus in obese (p <0.05). In addition, higher prevalence of sites with probing depth 3mm e 4mm in the obese group (p < 0.05). The alveolar bone loss was greater in obese group, however there was no significant difference to the control group (p>0.05). There was significant difference relative to the trabecular pattern, and obese women had greater marrow spaces, suggesting lower bone density than eutrophic (p < 0.05). Regarding radiomorphometric indexes, both groups showed values within the normal range. The salivary leptin concentration was higher in obese (p <0.05). The obese women had a higher impact of oral health on the quality of life, especially to the physical limitation domain. It is concluded, the periodontal condition was more severe in obese patients with a higher plaque index, probing depth greater, bleeding on probing and presence of calculus. The obese women also had greater bone loss and trabecular pattern sparse. Well as higher concentrations of salivary leptina.
Libri sul tema "Alveolar process"
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Bolin, Anders. Proximal alveolar bone loss in a longitudinal radiographic investigation. Stockholm: [publisher not identified], 1986.
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Gerhard, Pfeifer, e International Symposium on Craniofacial Anomalies and Clefts of Lip, Alveolus, and Palate, (4th : 1987 : Hamburg, Germany), a cura di. Craniofacial abnormalities and clefts of the lip, alveolus, and palate: Interdisciplinary teamwork : principles of treatment, long term results : 4th Hamburg international symposium. Stuttgart: Thieme, 1990.
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Dibart, Serge, e Jean-Pierre Dibart. Practical osseous surgery in periodontics and implant dentistry. Chichester, West Sussex, UK: Wiley-Blackwell, 2011.
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Jensen, Ole T. Alveolar Distraction Osteogenesis. Quintessence Publishing (IL), 2002.
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Stevens, Mark Gregory. Augmentation of murine alveolar macrophage functions by gamma interferon and indomethacin. 1988, 1988.
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Mandibular alveolar bone mass, structure and thickness in relation to skeletal bone density in dentate women. Göteborg: Department of Orthodontics, Faculty of Odontology, The Sahlgrenska Academy at Göteborg University, 2005.
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Pfeifer. Craniofacial Abnormalities and Clefts of the Lip, Alveolus and Palate. Thieme Medical Publishers, 1991.
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Craniofacial abnormalities and clefts of the lip, alveolus, and palate: Interdisciplinary teamwork : principles of treatment, long term results /4th Hamburg international symposium. Stuttgart: Thieme, 1991.
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Dibart, Serge, e Jean-Pierre Dibart. Practical Osseous Surgery in Periodontics and Implant Dentistry. Wiley & Sons, Incorporated, John, 2011.
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Dibart, Serge, e Jean-Pierre Dibart. Practical Osseous Surgery in Periodontics and Implant Dentistry. Wiley & Sons, Incorporated, John, 2011.
Cerca il testo completoCapitoli di libri sul tema "Alveolar process"
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Filippi, Andreas, e Yango Pohl. "Injuries to the Teeth and the Alveolar Process". In Oral and maxillofacial surgery, 317–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-66844-3_10.
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Kaya, Ilhan, Anand P. Santhanam, Kye-sung Lee, Panomsak Meemon, Nicolene Papp e Jannick P. Rolland. "A Physics-Based Modeling and Real-Time Simulation of Biomechanical Diffusion Process Through Optical Imaged Alveolar Tissues on Graphical Processing Units". In Recent Advances in the 3D Physiological Human, 149–62. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-565-9_10.
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"Alveolar process". In Clinical Head and Neck Anatomy for Surgeons, 110–19. CRC Press, 2015. http://dx.doi.org/10.1201/b19589-15.
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Awasthi, Maj. "Alveolar Process". In Manual for Dental Hygienist, 67. Jaypee Brothers Medical Publishers (P) Ltd., 2018. http://dx.doi.org/10.5005/jp/books/14199_12.
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"Alveolar Process Exostosis". In Specialty Imaging: Temporomandibular Joint, 570–71. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-323-37704-1.50109-1.
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Narayanaswamy, Krishna. "The Alveolar Process". In Review of Clinical Periodontology, 21. Jaypee Brothers Medical Publishers (P) Ltd., 2007. http://dx.doi.org/10.5005/jp/books/10733_4.
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Gupta, Priya, e Vinita Boloor. "Chapter-03 Alveolar Process". In Essential Quick Review: Periodontics, 15–20. Jaypee Brothers Medical Publishers (P) Ltd., 2016. http://dx.doi.org/10.5005/jp/books/12903_4.
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Tal, Haim, Zvi Artzi, Roni Kolerman, Ilan Beitlitum e Gal Goshe. "Augmentation and Preservation of the Alveolar Process and Alveolar Ridge of Bone". In Bone Regeneration. InTech, 2012. http://dx.doi.org/10.5772/33839.
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"Developmental fields in the cranium and alveolar process". In Etiology-Based Dental and Craniofacial Diagnostics, 37–45. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118912089.ch3.
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Robinson, Chapman. "Idiopathic interstitial pneumonias". In Oxford Handbook of Respiratory Medicine, a cura di Stephen J. Chapman, Grace V. Robinson, Rahul Shrimanker, Chris D. Turnbull e John M. Wrightson, 317–36. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198837114.003.0031.
Testo completoAbstract (sommario):
The idiopathic interstitial pneumonias (IIPs) comprise a group of diffuse lung diseases of unknown aetiology that primarily involve the pulmonary interstitium—the area between the alveolar epithelium and capillary endothelium, as well as the septal and bronchovascular tissues that make up the fibrous framework of the lung. These primarily interstitial processes, however, frequently also involve the airways, vasculature, and alveolar airspaces. The underlying pathological process is one of varying degrees of inflammation and fibrosis.
Atti di convegni sul tema "Alveolar process"
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Gaver, Donald P., Melissa A. Krueger e Samir N. Ghadiali. "The Influence of Surfactant Physicochemical Properties on Pulmonary Interfacial Flow Analogues". In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0218.
Testo completoAbstract (sommario):
Abstract Many of the lung’s mechanical properties are influenced by pulmonary surfactant physicochemical characteristics. Pulmonary surfactant is a complex lipid-protein mixture formed in the type II alveolar cells and secreted into the alveolar subphase [1]. These substances reduce the surface tension at the air-liquid interface of the lining fluid that coats the interior of the lung. At sufficiently high concentrations, pulmonary surfactant reduces the surface tension to near zero and. in the process, stabilizes the alveoli and small airways [2–4].
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Benintendi, Steven W., James B. Grotberg e David Halpern. "Cycle-Induced Flow and Transport in a Model of Alveolar Liquid Lining". In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2066.
Testo completoAbstract (sommario):
Abstract A simplified model of alveolar liquid lining dynamics is developed using a stretchable two-dimensional slot and an insoluble surfactant. Using lubrication theory, a coupled set of evolution equations is derived that describes the film height and interfacial surfactant distribution during the oscillation cycle. This system is solved asymptotically in the limit of small stretching amplitudes. The unsteady flow field is characterized by vortices at the end positions of the oscillation cycle. The cycle-averaged flow field also contains vortical structures, whose number and size vary over parameter space. For large molecular species, like proteins and surfactants, the bulk Peclet numbers can be large, indicating the importance of this liquid layer in the transport process. This may have an impact on the effectiveness and optimization of several medical treatment modalities. Also, since the liquid lining covers many cells within an alveolus, the predicted flow/transport patterns can allow a communication pathway among cells of the same alveolus.
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Kulish, Vladimir V., José L. Lage, Connie C. W. Hsia e Robert L. Johnson. "Red Blood Cell Distribution Effect on Lung Diffusing Capacity: A Macroscopic Analysis". In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2228.
Testo completoAbstract (sommario):
Abstract A novel mathematical model derived from fundamental engineering principles for simulating the spatial and temporal gas diffusion process within the alveolar region of the lung was presented recently by Koulich et al. [1]. The model depends on a physical property of the alveolar region termed effective diffusivity, function of the diffusivity, solubility, and interface geometry of each alveolar constituent. Unfortunately, the direct determination of the effective diffusivity of the alveolar region is impractical because of the difficulty in describing the internal geometry of each alveolar constituent. However, the transient solution of the macroscopic model can be used in conjunction with the lung diffusing capacity (measured in laboratory via the single-breath technique) to determine the effective diffusivity of the alveolar region. With the effective diffusivity known, the three-dimensional effects of red blood cell distribution on the lung diffusing capacity can be predicted via numerical simulations. The results, obtained for normal (random), uniform, center-cluster, corner-cluster, and several chain-like distributions, unveil a strong relationship between the type of cell distribution and the lung diffusing capacity.
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Chhabra, Sudhaker, e Ajay K. Prasad. "Effect of Geometric and Dynamic Parameters on Fluid Flow and Particle Dispersion in Human Lung Acini". In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-204757.
Testo completoAbstract (sommario):
Breathing, defined as the exchange of gases between the respiratory system and the environment, is an essential process for life. The human respiratory system can be divided into three parts: (i) nose, mouth, and nasopharynx, (ii) trachea, and (iii) lungs. The human lung can be further subdivided into conducting airways which are non-alveolated and comprise the upper part of lung, and the acini which consist of flexible, alveolated airways and are responsible for gas exchange [1]. The alveoli collectively provide a large surface area (∼70 m2) for efficient gas exchange [1]; oxygen diffuses into the blood through the alveolar epithelium, whereas carbon dioxide diffuses in the opposite direction from the blood to the lung.
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Moreira, João Victor Aguiar, Isabela Maria Bernardes Goulart, Diogo Fernandes dos Santos, Isabella Sabião Borges, Pedro Otávio Rego de Aguiar, Thaciany Soares Ferreira, Leonardo Peixoto Garcia et al. "Bilateral diaphragmatic eventration and alveolar hypoventilation in congenital myotonic dystrophy". In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.533.
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Context: Congenital myotonic dystrophy (CMD) is a subtype of type 1 myotonic dystrophy presented in the neonatal period associated with a 16–40% mortality rate. CMD cause significant morbidity and mortality and often require intensive intervention at birth because of hypotonia, respiratory failure and feeding difficulties. It can cause respiratory problems including ineffective cough, recurrent pulmonary infections, orthopnea, dyspnea, poor sleep, apnea and snoring. However, there are few descriptions about diaphragmatic impairment in CMD. We present a baby who had bilateral diaphragmatic eventration associated with CMD. Case report: A term outborn female baby with normal birth weight, delivered by cesarean presenting hypotonia and breathing difficulty since birth. There was no history of meconium aspiration syndrome and aspiration pneumonia. Neurological examination showed a severe hypotonia, eyelid ptosis, oral motor weakness and suction inability, without contractures. Chest X-rays confirmed the bilateral diaphragmatic paralysis. Electroneuromyography confirmed a marked myopathic involvement with frequent myotonic discharges. The mother presented clinical and electrical myotonic phenomena. The baby started mechanical ventilation as was not maintaining saturation on head box oxygen. After surgical repair the baby started on non-invasive respiratory support with improvement of ventilatory conditions. Conclusion: Diaphragmatic eventration is a congenital condition where the muscle maintains its normal costal attachments but is significantly elevated with limited motility. Clinical manifestations vary to life-threatening respiratory distress. Bilateral congenital diaphragmatic eventration is rarer and has more guarded prognosis. Early diaphragmatic plication enhances weaning process and may prevent or minimize the morbidity. Infants with CMD should be monitored for diaphragmatic impairment.
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Hassanipour, Fatemeh, e Jose´ Lage. "Enhanced Mini-Channel Forced Convection With Encapsulated Phase-Change Particles". In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56037.
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In this study we propose a new cooling concept using encapsulated phase-change particles flowing in a parallel-plate mini-channel. This novel concept is inspired by the gas exchange process in alveolar capillaries, where red blood cells (RBCs) flow with blood plasma, yielding very high gas transfer efficiency. Another important characteristic of alveolar capillary blood flow, which is related to the high efficiency of the lungs, is the snug fitting of the RBCs into the capillary. Hence, we conjecture that using particles similar to RBCs, i.e. with diameter similar to the spacing between the parallel plates, is likely to lead to high heat transfer efficiency as well. We report here experimental results of preliminary tests performed with octadecane paraffin (C18H38), a phase-change material, encapsulated in a thin melamine shell, flowing with water through a heated parallel-plate channel test module. We measured the temperature distribution along the heated surface of the channel for various water flow rates, with and without particles, and varying the number of particles. Results are reported in terms of the channel heated surface average temperature and the average Nusselt number.
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KOTH, Valesca, Gabriel RUBENSAM, Bernardo Ottoni Braga BARREIRO, Thaynã Spencer STEIN e Karen CHERUBINI. "TOTAL CONTENT OF CALCIUM AND PHOSPHORUS IN SERUM OF WISTAR RATS BY AN OPTIMIZED METHOD OF ICP-MS". In SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE. DR. D. SCIENTIFIC CONSULTING, 2022. http://dx.doi.org/10.48141/sbjchem.21scon.27_abstract_koth.pdf.
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In the Odontology field, the modeling process of alveolar bone has been a topic of investigation for the last years since the lost bone after tooth extraction can preclude aesthetic and function. In this practice, the volume of the tissue to be modeled depends on, among other factors, the serum levels of calcium and phosphorus, and it is of interest to monitor these elements to better understand the mechanism of tissue regeneration. These elements are routinely analyzed for clinical purposes, as serum constituents, by UV-VIS spectrophotometry after chromogenic reactions for each metal with different reagents. Depending on the analytical demands and work objectives, it is necessary to have methods based on technologies that allow multi-element quantification in a single experiment. In this context, ICP-MS has been considered a powerful tool for rapid multi-element analysis due to its high selectivity and sensitivity. However, it has been reported that samples with high content of salts and proteins, such as serum samples, cause matrix-induced interferences due to weak sample preparation and the presence of polyatomic ions. The present study aimed to identify and mitigate matrix effects in rat serum samples during the simultaneous quantification of calcium and phosphate using ICP-MS and evaluate its capability of differentiating element levels from Wistar rats subjected to tooth extraction with and without alveolar bone grafting. In addition, the optimized method can be used for more comprehensive mineralomics studies related to the bone modeling process in future studies.
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Neto, Eclésio Batista de Oliveira, Anne Oliveira Gama e João Carlos de Melo Araújo. "ACHADOS PATOLÓGICOS NOS CASOS DE COVID-19: UMA REVISÃO SISTEMÁTICA". In I Congresso Brasileiro de Estudos Patológicos On-line. Revista Multidisciplinar em Saúde, 2022. http://dx.doi.org/10.51161/conbesp/27.
Testo completoAbstract (sommario):
Introdução: O COVID-19, assim como o SARS e o MERS, é causado por um tipo de coronavírus responsável por pneumonia. Apesar das semelhanças com as outras pneumonias virais, existem particularidades nos achados patológicos, como infiltrados mononucleares intersticiais e células sinciciais multinucleadas, afetando, principalmente, o trato respiratório. Os exames patológicos, obtidos através de autópsia, têm contribuído para aumentar o conhecimento sobre essa infecção. Objetivo: Revisar os achados histopatológicos relacionados ao Covid-19. Material e métodos: Foi realizada uma revisão bibliográfica na base de dados PUBMED com os descritores "Pathology, Clinical" e " Sars-cov-2”, com o operador AND. Os critérios de inclusão foram (1) textos completos condizentes com o tema e objetivos do trabalho; (2) em inglês, espanhol e português; (3) publicados nos últimos 2 anos. Foram encontrados 18 estudos, após a aplicação dos critérios de inclusão e exclusão, foram utilizados 6 estudos. Resultados: Os artigos descrevem os principais achados patológicos nas amostras de tecidos retiradas dos pulmões. O vírus infecta o parênquima pulmonar, e ao se multiplicar, destrói as células hospedeiras, dando início ao processo de necrose nos alvéolos pulmonares através de lesões difusas, caracterizadas por hiperplasia dos pneumócitos do tipo II, acarretando citomegalia e cariomegalia. Ademais, é possível uma expansão das paredes e septos alveolares devido à proliferação fibroblástica. O processo de degeneração hialina é evidente, pois o material necrótico e fibroso se deposita nos septos, apresentando-se ao microscópio com um aspecto eosinofílico e hialino, constituindo membranas hialinas. O processo patológico inflamatório é representado por: exsudatos proteicos nos espaços alveolares, grandes glóbulos proteicos espalhados, fibrina intra-alveolar com presença de células inflamatórias (células mononucleares e gigantes multinucleadas). E, foram observadas células nos espaços intra-alveolares com citoplasma granular e anfifílico, com presença de núcleos proeminentes, demonstrando uma invasão leucocitária, sendo indicados por numerosos macrófagos CD68, alguns linfócitos CD45 que são encontrados, principalmente, no espaço intersticial, e uma grande quantidade de neutrófilos. A alteração vascular pode se apresentar com a formação de trombos. Conclusão: As características histológicas observadas no tecido pulmonar, demonstraram achados comuns de pneumonias virais, e específicos como: dano alveolar difuso bilateral com exsudatos de fibromixóide celular e infiltrados inflamatórios mononucleares intersticiais.
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Small, Laura, e Fatemeh Hassanipour. "Phase Change Material Particulate Flow Through a Rectangular Channel: Effect of Parachute-Shaped Particles on the Heat Transfer". In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58158.
Testo completoAbstract (sommario):
This study presents numerical simulations of forced convection with parachute-shaped encapsulated phase-change material particles in water, flowing through a square cross-section duct with top and bottom iso-flux surfaces. The system is inspired by the gas exchange process in the alveolar capillaries between the red blood cells (RBC) and the lung tissue. The numerical model was developed for the motion of elongated encapsulated phase change particles along a channel in a particulate flow where particle diameters are comparable with the channel height. Results of the heat transfer enhancement for the parachute-shaped particles are compared with the circular particles. Results reveal that the key role in heat transfer enhancement is the snugness movement of the particles and the parachute-shaped geometry yields small changes in heat transfer coefficient when compared to the circular ones. The effects of various parameters including particle diameter and volume-fraction, as well as fluid speed, on the heat transfer coefficient is investigated and reported in this paper.
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Mayer, A., J. Czerwinski e M. Kasper. "Nanosize Metal Oxide Particle Emissions From Diesel- and Petrol-Engines". In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60045.
Testo completoAbstract (sommario):
All internal combustion piston engines emit nanoparticles. Part of them are soot particles as a results of incomplete combustion of fuels, or lube oil. Another part are metal particles, most probably oxides, commonly called ash. A major source of metal particles is engine wear and corrosion. The lube oil reentraines these abraded particles into the combustion zone. There they are partially vaporized and ultrafine oxide particles formed through nucleation [1]. Other sources are metallic additives to the lube oil, or the fuel, and debris from the catalytic coatings in the exhaust-gas after-treatment. The formation process results in extremely fine particles, typically smaller than 50 nm. Thus they can intrude through the alveolar membranes directly into the human organism and can even penetrate the cell nucleus [5]. The consequent health risk necessitates a careful investigation of these emissions and effective curtailment. Substantial information is available on Diesel engine particulate emissions, [2, 3, 4] but there are almost no results for SI engines reported. Beside an example of metal oxide particles from a Diesel engine, [2], the present paper shows some preliminary results of particle mass and nanoparticle emissions of SI engines. Four SI engines were investigated: two older and two newer engines, comprising two car engines and two motorbikes. The tests were done on standard transient driving cycles, and steady-state at constant 50 km/h and idling because prior to this study high concentrations of ash were observed with Diesels during idling, [2]. All tests were done with particle samples collected from the CVS tunnel, during long operating periods, to have sufficient material for analyzing. At the steady-state points, the particle size spectra were measured and based on this the source as “ash” postulated. The results show that the older engines emit high concentrations of both soot and ash particles. The size distribution is bimodal for soot and ash particles. The newer engines’ emission results are less uniform and the concentrations are lower, as expected. Altogether, the concentrations of these ash particles in the exhaust gas of Diesel and SI-engines can be so high, that more detailed investigations are requiredy.
Rapporti di organizzazioni sul tema "Alveolar process"
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Parusheva, Sadeta, Dimitar Metodiev, Hodor Fakih, Tzvetana Boshnakova e Boyko Georgiev. Histomorphological Study of Regenerative Processes in Post-extraction Alveolar Sockets after Application of a Combined Preservation Method. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, agosto 2021. http://dx.doi.org/10.7546/crabs.2021.08.17.
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