Academic literature on the topic 'Mandibular condylar cartilage'
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Journal articles on the topic "Mandibular condylar cartilage"
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Yokota, T., H. Shimokawa, S. Shibata, K. Itoh, Y. Baba, K. Ohya, K. Ohyama, and S. Suzuki. "Insulin-like Growth Factor I Regulates Apoptosis in Condylar Cartilage." Journal of Dental Research 87, no. 2 (February 2008): 159–63. http://dx.doi.org/10.1177/154405910808700216.
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Endogenous insulin-like growth factor-I (IGF-I) is known to affect the growth and development of condylar cartilage. However, the critical effect of IGF-I on cell survival is still unknown. We hypothesized that endogenous IGF-I could regulate the survival of cells of the mandibular condylar cartilage. Mandibular condyles dissected from 12-day-old rats were cultured for 1, 3, and 5 days in medium containing antisense oligodeoxynucleotide (AS-ODN) for IGF-I. Real-time RT-PCR analysis showed that the levels of IGF-I and IGF binding protein (IGFBP)3 mRNAs in the AS-ODN group were significantly decreased. After 3 days’ culture, the number of necrotic cells was observed in the undifferentiated mesenchymal cell layer. These cells were TUNEL-positive and confirmed to be apoptotic by electron microscopic observation. Immunoblotting revealed that expression of cleaved caspase3 was increased with AS-ODN. These results may suggest that the cells in the undifferentiated mesenchymal cell layer of the mandibular condyle require IGF-I for survival.
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Tang, G. H., A. B. M. Rabie, and U. Hägg. "Indian Hedgehog: A Mechanotransduction Mediator in Condylar Cartilage." Journal of Dental Research 83, no. 5 (May 2004): 434–38. http://dx.doi.org/10.1177/154405910408300516.
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Indian hedgehog (Ihh) is a critical mediator transducing mechanical signals to stimulate chondrocyte proliferation. To clarify the cellular signal transduction pathway that senses and converts mechanical signals into tissue growth in mandibular condyle, we evaluated Ihh expression and its relation to the kinetics of replicating mesenchymal cells in condylar cartilage during natural growth and mandibular advancement. Thirty-five-day-old Sprague-Dawley rats were fitted with functional appliances. Experimental animals with matched controls were doubly labeled with iododeoxyuridine and bromodeoxyuridine so that we could evaluate the cycles of the proliferative mesenchymal cells. Mandibular advancement triggered Ihh expression in condylar cartilage. A higher level of Ihh expression coincided with the increase of the replicating mesenchymal cells’ population and the shortening of the turnover time. These findings suggested that Ihh acts as a mediator of mechanotransduction that converts mechanical signals resulting from anterior mandibular displacement to stimulate cellular proliferation in condylar cartilage.
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Sá, Milena Peixoto Nogueira de, Jacqueline Nelisis Zanoni, Carlos Luiz Fernandes de Salles, Fabrício Dias de Souza, Uhana Seifert Guimarães Suga, and Raquel Sano Suga Terada. "Morphometric evaluation of condylar cartilage of growing rats in response to mandibular retractive forces." Dental Press Journal of Orthodontics 18, no. 4 (August 2013): 113–19. http://dx.doi.org/10.1590/s2176-94512013000400016.
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INTRODUCTION: The mandibular condylar surface is made up of four layers, i.e., an external layer composed of dense connective tissue, followed by a layer of undifferentiated cells, hyaline cartilage and bone. Few studies have demonstrated the behavior of the condylar cartilage when the mandible is positioned posteriorly, as in treatments for correcting functional Class III malocclusion. OBJECTIVE: The aim of this study was to assess the morphologic and histological aspects of rat condyles in response to posterior positioning of the mandible. METHODS: Thirty five-week-old male Wistar rats were selected and randomly divided into two groups: A control group (C) and an experimental group (E) which received devices for inducing mandibular retrusion. The animals were euthanized at time intervals of 7, 21 and 30 days after the experiment had began. For histological analysis, total condylar thickness was measured, including the proliferative, hyaline and hypertrophic layers, as well as each layer separately, totaling 30 measurements for each parameter of each animal. RESULTS: The greatest difference in cartilage thickness was observed in 21 days, although different levels were observed in the other periods. Group E showed an increase of 39.46% in the total layer, reflected by increases in the thickness of the hypertrophic (42.24%), hyaline (46.92%) and proliferative (17.70%) layers. CONCLUSIONS: Posteriorly repositioning the mandible produced a series of histological and morphological responses in the condyle, suggesting condylar and mandibular adaptation in rats.
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Oyonarte, Rodrigo, Mariana Zárate, and Francisco Rodriguez. "Low-Intensity Pulsed Ultrasound Stimulation of Condylar Growth in Rats." Angle Orthodontist 79, no. 5 (September 1, 2009): 964–70. http://dx.doi.org/10.2319/080708-414.1.
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Abstract Objective: To test the hypothesis that low-intensity pulsed ultrasound (LIPUS) stimulation does not histologically affect the growth of mandibular condylar cartilage. Materials and Methods: Thirty-five 20-day-old Sprague-Dawley rats were assigned to experimental and control groups. Experimental rats were stimulated with LIPUS in the temporomandibular joint (TMJ) region unilaterally, for 10 or 20 minutes for 20 days. After euthanasia, histological specimens were analyzed qualitatively and histomorphometrically at the anterior and posterior aspects of the mandibular condyle, including the condylar cartilage and the area and perimeter of subchondral bony trabeculae. Results: LIPUS stimulation may alter the histological arrangement of the condylar bone and cartilage, showing qualitative differences on specimens treated for 10 or 20 minutes daily compared with controls. Cartilaginous layer thickness was not affected by LIPUS stimulation to a significant level, but was modified at the relative layer thickness within the cartilage at the anterior aspect of the condyle (P < .05). At the subchondral bone level, 20-minute stimulation significantly increases trabecular perimeter (P = .01). Conclusions: LIPUS application may affect mandibular growth pattern in rats acting at the cartilage and bone level. The effect of LIPUS on the growing condyle is expressed through a variation in trabecular shape and perimeter. A greater response is achieved when stimulated for 20 minutes instead of 10 minutes daily.
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Lyros, Ioannis, Despoina Perrea, Konstantinos Tosios, Nikolaos Nikitakis, Ioannis A. Tsolakis, Efstratios Ferdianakis, Eleni Fora, et al. "Histological and Biochemical Analysis after Posterior Mandibular Displacement in Rats." Veterinary Sciences 9, no. 11 (November 10, 2022): 625. http://dx.doi.org/10.3390/vetsci9110625.
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The present study aimed to investigate any biochemical and histological changes of the rat condyle and mandible in animals that had sustained mandibular growth restriction. Seventy-two male Wistar rats were divided into two equal groups, experimental and control. Each group consisted of three equal subgroups. The animals were sacrificed 30, 60, and 90 days after the start of the experiment. Blood samples were collected from the eye, and the osteoprotegerin (OPG), Receptor Activator of Nuclear Factor Kappa B Ligand (RANKL), and Macrophage Colony-Stimulating factor (MCSF)concentrations were measured by using enzyme-linked immunosorbent assay (ELISA) kits. A histological analysis was performed on the mandibular condyles. The blood serum values of OPG, RANKL, and MCSF did not exhibit any statistically significant difference between groups or subgroups. However, significant histological changes became evident after a histomorphometric condylar examination was performed. The Bone Surface/Total Surface ratio appeared reduced in the anterior and posterior regions of the condyle. In addition, the Posterior Condylar Cartilage Thickness was measured and determined to be significantly diminished. The present intervention that employed orthodontic/orthopedic devices did not prove to have any significant effect on the circulating proteins under study. Posterior displacement of the mandible may culminate only in local histological alterations in condylar cartilage thickness and its osseous microarchitecture.
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Tang, G. H., and A. B. M. Rabie. "Runx2 Regulates Endochondral Ossification in Condyle during Mandibular Advancement." Journal of Dental Research 84, no. 2 (February 2005): 166–71. http://dx.doi.org/10.1177/154405910508400211.
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Runx2 is a transcription factor prerequisite for chondrocyte maturation and osteoblast differentiation. We tested the hypothesis that Runx2 is responsible for signaling chondrocyte maturation and endochondral ossification in the condyle during mandibular advancement. Fifty 35-day-old Sprague-Dawley rats were fitted with functional appliances for 3, 7, 14, 21, and 30 days. Experimental animals with 50 matched controls were labeled with bromodeoxyuridine for evaluation of the invasion of chondroclasts and osteoblasts into condylar cartilage. Mandibular advancement elicited Runx2 expression in condylar cartilage, and subsequently led to an expansion of type X collagen domain in the hypertrophic layer. Stronger Runx2 mRNA signals in subchondral bone corresponded with the increase in the recruitment of osteoblasts and chondroclasts, which preceded the increase of new bone formation in the condyle. Thus, Runx2 mediates chondrocyte terminal maturation and endochondral ossification in the mandibular condyle in response to mandibular advancement.
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Xiao, Fang, Hidetaka Hayashi, Tadashi Fujita, Maya Shirakura, Yuji Tsuka, Eri Fujii, Kazuo Tanne, and Kotaro Tanimoto. "Role of articular disc in cartilaginous growth of the mandible in rats." APOS Trends in Orthodontics 7 (February 1, 2017): 29–34. http://dx.doi.org/10.4103/2321-1407.199176.
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Displacement of the temporomandibular joint (TMJ) disc causes a lateral shift of the mandible and less-developed and/or distally located mandible unilaterally and bilaterally, respectively, if occurred in growing individuals. The purpose of this study was to evaluate mandibular condylar growth in growing rats after TMJ discectomy and to explore a certain significant role of articular disc in the TMJ in mandibular or cartilaginous growth. Eighteen 4-week-old Wistar strain male rats were divided into two groups with nine in each group, i.e., rats with TMJ discectomy (discectomy group) and only sham operation (control group). Four weeks after initiating the experiment, morphometric analyses of the mandible were performed using a rat and mouse cephalometer and micro-computed tomography. Then, the mandibular condyles were subjected to histomorphometric analyses. Condylar and mandibular growth was reduced significantly in the discectomy group than in the control group. In the discectomy group, the condyle also became flatter and smaller. In addition, the 4-layer structure of condylar cartilage was unclear with thicker fibrous and thinner lower hypertrophic layers in the discectomy group when compared to the controls. It is shown that resection of the articular disc substantially affects condylar and mandibular growth in terms of the cartilaginous growth, suggesting that TMJ disc is indispensable for maintaining normal growth of the condyle and mandible, leading to optimal development of the TMJ and the entire mandible.
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Shen, G., and M. Ali Darendeliler. "The Adaptive Remodeling of Condylar Cartilage— A Transition from Chondrogenesis to Osteogenesis." Journal of Dental Research 84, no. 8 (August 2005): 691–99. http://dx.doi.org/10.1177/154405910508400802.
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Mandibular condylar cartilage is categorized as articular cartilage but markedly distinguishes itself in many biological aspects, such as its embryonic origin, ontogenetic development, post-natal growth mode, and histological structures. The most marked uniqueness of condylar cartilage lies in its capability of adaptive remodeling in response to external stimuli during or after natural growth. The adaptation of condylar cartilage to mandibular forward positioning constitutes the fundamental rationale for orthodontic functional therapy, which partially contributes to the correction of jaw discrepancies by achieving mandibular growth modification. The adaptive remodeling of condylar cartilage proceeds with the biomolecular pathway initiating from chondrogenesis and finalizing with osteogenesis. During condylar adaptation, chondrogenesis is activated when the external stimuli, e.g., condylar repositioning, generate the differentiation of mesenchymal cells in the articular layer of cartilage into chondrocytes, which proliferate and then progressively mature into hypertrophic cells. The expression of regulatory growth factors, which govern and control phenotypic conversions of chondrocytes during chondrogenesis, increases during adaptive remodeling to enhance the transition from chondrogenesis into osteogenesis, a process in which hypertrophic chondrocytes and matrices degrade and are replaced by bone. The transition is also sustained by increased neovascularization, which brings in osteoblasts that finally result in new bone formation beneath the degraded cartilage.
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Tanaka, E., E. Yamano, D. A. Dalla-Bona, M. Watanabe, T. Inubushi, M. Shirakura, R. Sano, K. Takahashi, T. van Eijden, and K. Tanne. "Dynamic Compressive Properties of the Mandibular Condylar Cartilage." Journal of Dental Research 85, no. 6 (June 2006): 571–75. http://dx.doi.org/10.1177/154405910608500618.
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The mandibular condylar cartilage plays an important role as a stress absorber during function. However, relatively little information is available on its dynamic properties under compression. We hypothesized that these properties are region-specific and depend on loading frequency. To characterize the viscoelastic properties of the condylar cartilage, we performed dynamic indentation tests over a wide range of loading frequencies. Ten porcine mandibular condyles were used; the articular surface was divided into 4 regions, anteromedial, anterolateral, posteromedial, and posterolateral. The dynamic complex, storage, and loss moduli increased with frequency, and these values were the highest in the anteromedial region. Loss tangent decreased with frequency from 0.68 to 0.17, but a regional difference was not found. The present results suggest that the dynamic compressive modulus is region-specific and is dependent on the loading frequency, which might have important implications for the transmission of load in the temporomandibular joint.
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Rabie, A. B. M., G. H. Tang, H. Xiong, and U. Hägg. "PTHrP Regulates Chondrocyte Maturation in Condylar Cartilage." Journal of Dental Research 82, no. 8 (August 2003): 627–31. http://dx.doi.org/10.1177/154405910308200811.
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PTHrP is a key factor regulating the pace of endochondral ossification during skeletal development. Mandibular advancement solicits a cascade of molecular responses in condylar cartilage. However, the pace of cellular maturation and its effects on condylar growth are still unknown. The purpose of this study was to evaluate the pattern of expression of PTHrP and correlate it to cellular dynamics of chondrocytes in condylar cartilage during natural growth and mandibular advancement. We fitted 35-day-old Sprague-Dawley rats with functional appliances. Experimental animals with matched controls were labeled with bromodeoxyuridine 3 days before their death, so that mesenchymal cell differentiation could be traced. Mandibular advancement increased the number of differentiated chondroblasts and subsequently increased the cartilage volume. Higher levels of PTHrP expression in experimental animals coincided with the slowing of chondrocyte hypertrophy. Thus, mandibular advancement promoted mesenchymal cell differentiation and triggered PTHrP expression, which retarded their further maturation to allow for more growth.
Dissertations / Theses on the topic "Mandibular condylar cartilage"
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Girdler, N. M. "The role of mandibular condylar cartilage in articular cartilage repair." Thesis, King's College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309110.
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Ramirez, German Omar. "Influence of growth hormone and incisor disocclusion on mandibular condylar cartilage /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16371.pdf.
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Basudan, Aishah Mohammed A. "Zone-specific gene expression of mandibular condylar cartilage : biological implications of regional differences." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2015. http://hdl.handle.net/10722/211127.
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Mandibular condylar cartilage (MCC) consists of fibrous (F), proliferative (P), mature (M) and hypertrophic (H) zones, and exhibits distinctive biological features in physiology and function. Accordingly, the genetic regulation of MCC is expected to be different from other articular cartilages. Combined lasercapture microdissection (LCM) and microarray analysis (MAA) approach allows large-scale screening of zone-specific gene expressions. A few investigators have attempted to apply this approach on different cartilages, but not on MCC yet. Therefore, this study aimed to: 1) optimize an LCM protocol for isolating homogenous cell populations from MCC zones; 2) perform a zone-specific comprehensive gene expression analysis for MCC using LCM & MAA; and 3) find a set of genes, following the validation of MAA data using in-vivo and invitro quantitative reverse transcription-polymerase chain reaction (qRT-PCR), which could potentially distinguish MCC zones from each other and from articular chondrocytes.
MCC and femoral condylar cartilage (FCC) specimens were harvested from normal 5-week-old SD rats, and formalin-fixed sections and cryosections were compared histologically. LCM samples for five groups (FCC and four MCC zones) were prepared, and then RNAs were extracted and evaluated for integrity. For MAA experiment, LCM samples were amplified before microarray hybridization. MAA data were analyzed using GeneSpring software. cDNA from unamplified LCM-RNA samples were also prepared for the five groups for in-vivo qRT-PCR validation of 48 genes selected from MAA data, 10 of which were additionally validated by cultivating ATDC5 cells and extracting RNA at different time points for in-vitro qRT-PCR validation.
Factors enhancing tissue visualization, LCM efficiency, LCM specificity, and RNA yield and integrity were optimized in the suggested LCM protocol. At a 2-fold change, 8353 (26.86%) transcripts were differentially expressed among the MCC zones and FCC. Subsequent data mining allowed the creation of seven subsets of 127 genes. Forty-eight genes were selected for validation based on their signal intensities, clustering classification, and gene ontology. In-vivo and in-vitro qRT-PCR showed high consistency with the MAA data. Results revealed robust gene expression differences among MCC zones, and between articular chondrocytes and MCC cells. The F & P zones could be characterized by upregulation of Crabp1, Dpt, Fndc1, Aspn, Tnmd, Bcl11b, Angptl1, Col14a1, and downregulation of Mug1, Foxa2, Lect1, and Matn3. Opposite modulation of the same genes may characterize M & H zones. In addition, unizonal distinct profiles were also identified; upregulated Igfbp6, Igha, Hils1, and Ptgds genes might be considered as potential markers for F, P, M, and H zones, respectively.
In conclusion, this study sets up an LCM protocol that enables isolating homogenous zone-specific cell populations from the MCC, and obtaining highquality RNAs for subsequent gene expression analysis. Comprehensive gene profiling has been successfully achieved with high fidelity; using minute RNA amounts via the LCM & MAA combined approach. The MCC cells clearly exhibit distinguishable phenotypes from the articular chondrocytes, and a set of genes has been determined as potential unizonal/bizonal markers to identify MCC zones. Generating accurate regional data enhances our understanding of MCC biology and provides invaluable insights for tissue-engineering and cellbased therapeutic strategies.published_or_final_version
Dentistry
Doctoral
Doctor of Philosophy
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Song, Yang. "Identification of the novel genes during endochondral ossification in the mandibular condylar cartilage." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43085568.
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Song, Yang, and 宋揚. "Identification of the novel genes during endochondral ossification in the mandibular condylar cartilage." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085568.
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Bryndahl, Fredrik. "Temporomandibular joint disk displacement and subsequent adverse mandibular growth : a radiographic, histologic and biomolecular experimental study." Doctoral thesis, Umeå : Oral and Maxillofacial Radiology, Umeå University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1624.
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Farias, Neto Arcelino 1983. "Influência de alterações oclusais na articulação temporomandibular e crescimento mandibular = estudo em modelo animal." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290520.
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Orientador: Célia Marisa Rizzatti BarbosaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-18T16:04:07Z (GMT). No. of bitstreams: 1 FariasNeto_Arcelino_D.pdf: 1895628 bytes, checksum: 3d9e789620307fdbeaffe939bf75437e (MD5) Previous issue date: 2011
Resumo: A cartilagem articular do côndilo mandibular é responsável pelo crescimento ósseo endocondral durante o desenvolvimento mandibular. Ela depende do funcionamento adequado da articulação temporomandibular (ATM) para sua diferenciação e maturação. Trabalhos demonstram que a manipulação funcional da mandíbula foi capaz de alterar a dinâmica fisiológica dessa cartilagem. Nesse sentido, a protrusão diminuiria a ação de cargas sobre o côndilo mandibular, estimulando o crescimento endocondral, e de forma inversa, a retrusão aumentaria a pressão sobre a cartilagem, inibindo o crescimento. Essas técnicas têm sido utilizadas com relativo sucesso na ortopedia facial com o intuito de corrigir discrepâncias maxilo-mandibulares. Entretanto, alguns quadros patológicos presentes nas ATMs podem alterar o seu desenvolvimento normal. Um dos fatores etiológicos que pode ser associado à presença de alterações no côndilo mandibular é a oclusão dental. A hipótese formulada é de que a presença de instabilidade ortopédica causada por um fator oclusal durante a fase de desenvolvimento pode levar à deficiência do crescimento mandibular e alterações intra-articulares. Assim, este trabalho teve por objetivo avaliar, em modelo animal, alterações da oclusão dental sobre o crescimento mandibular e tecidos intra-articulares. O estudo foi randomizado e cego. Foram utilizadas 40 ratas Wistar com 5 semanas de idade divididas aleatoriamente em 4 grupos com o mesmo número de animais: controle, com interferência oclusal, com ausência dos molares inferiores unilateral e com ausência dos molares inferiores bilateral. Os animais foram acompanhados por 8 semanas, período que correspondeu a sua fase de maturação óssea. Após esse período, os animais foram sacrificados e realizou-se tomografia computadorizada de feixe cônico (Cone beam) de suas cabeças para construção de protótipos de biomodelos, sobre os quais foram mensurados o comprimento da mandíbula, a altura do ramo mandibular e distância intercondilar. Em seguida, as articulações temporomandibulares foram cuidadosamente preparadas para análise imunohistoquímica dos níveis de colágeno tipo II, Fator de Crescimento Endotelial Vascular, e Interleucina 1? na cartilagem condilar. Os dados foram submetidos a análise estatística através do Software SPSS versão 17.0. As médias entre os grupos foram comparadas através do One-way Anova, enquanto as diferenças entre os lados da mandíbula foram avaliadas através do teste t de Student (?=0.05). A partir da análise dos resultados, observou-se que alterações oclusais podem afetar o desenvolvimento do osso mandibular, bem como alterar a expressão de Colágeno tipo II, Fator de Crescimento Endotelial Vascular e Interleucina 1? na cartilagem condilar. Diante do exposto, conclui-se que a oclusão dentária é capaz de interferir na dinâmica dos tecidos intra-articulares, sendo um fator importante durante o desenvolvimento craniofacial
Abstract: The condylar cartilage regulates the endochondral ossification during mandibular development. Mechanical stimulus in the temporomandibular joint (TMJ) plays an important role in cell proliferation and differentiation of mandibular condyle. Studies have shown that functional mandibular displacement can affect TMJ cartilage dynamics. Mandibular advancement induces profound metabolic changes in the condyle and enhances growth. In contrast, mandibular retraction reduces growth. The overall picture emerging from the data is that unloading of the condyle increases growth, while loading reduces it. Therefore, dental occlusion could be one of the factors associated with the alteration of the TMJ growth. The hypothesis is that orthopedic instability caused by occlusal factors present during TMJ development can affect mandibular growth and intra-articular tissue. Thus, the purpose of this study was to evaluate the influence of dental occlusion on mandibular growth and intra-articular tissue in Wistar rats. The study was randomized and blinded. Forty 5 weeks old female Wistar rats composed the sample. The animals were randomly allocated to four groups with the same number of rats: (1) control, (2) occlusal appliance for functional posterior displacement of the mandible, (3) unilateral mandibular tooth extraction, (4) bilateral mandibular tooth extraction. The rats were sacrificed after 8 weeks, when they had achieved skeletal maturity. Immediately after death, the heads were fixed in 10% paraformaldehyde, and cone beam CT scan images were taken using the Classic I-CAT (Imaging Sciences International, Hatfield, PA, USA). The 3-dimensional images of rats' skulls were exported in multifile Digital Imaging and Communications in Medicine (DICOM) format, and acrylic rapid-prototyped templates of the mandibles were constructed for measurement of mandibular growth. Immunostaining was used for the detection of type II collagen, vascular endothelial growth factor (VEGF) and interleukin-1?. The data were processed with SPSS software (V 17.0 for Windows, SPSS Inc, Chicago, IL, USA). Differences among the groups were analyzed by one-way ANOVA (Tukey test as post-hoc test), while differences between sides were analyzed by non-paired Student's t test. Shapiro-Wilk and Levene tests were used to observe normality and variance homogeneity, respectively. Confidence level was set at 5%. The results of this study showed that dental occlusion is an important factor for the integrity of intra-articular tissues and to the healthy craniofacial development, emphasizing the importance of early treatment to normalize occlusion and create appropriate conditions for normal craniofacial development
Doutorado
Protese Dental
Doutor em Clínica Odontológica
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Ng, Fu-shan Andrew. "Factors regulating cartilage cell differentiation and maturation in mandibular condyle /." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31942593.
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Ng, Fu-shan Andrew, and 伍富山. "Factors regulating cartilage cell differentiation and maturation in mandibular condyle." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B45012246.
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Artuzi, Felipe Ernesto. "Influência da condilotomia sobre a articulação temporomandibular de coelhos com osteoartrite quimicamente induzida." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/56460.
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Introdução: A osteoartrite (OA) é caracterizada como sendo uma doença degenerativa das articulações, apresentando uma reação inflamatória de baixo grau. Dependendo da severidade da osteoartrite, os tratamentos podem ser cirúrgicos ou não cirúrgicos. A condilotomia é uma opção de técnica cirúrgica sem interposição articular, em que se realiza uma fratura guiada, a partir de uma osteotomia oblíqua no processo condilar da mandíbula. Após a cirurgia, o côndilo assume uma posição mais anterior e inferior, com recaptura do disco, possibilitando funcionalidade articular e processo de reparo. Proposição: O objetivo do presente trabalho foi avaliar os efeitos da condilotomia nas estruturas teciduais do côndilo da articulação temporomandibular de coelhos portadores de osteoartrite quimicamente induzida. Materiais e métodos: Foram utilizados dois grupos de animais com degeneração de articulação temporomandibular (ATM) quimicamente induzida. O grupo controle (n=15) acompanhou o grupo teste conforme os tempos de morte dos animais. O grupo teste (n=15) foi submetido à fratura cirúrgica guiada do côndilo mandibular, após 40 dias a partir da indução da doença. A análise histológica da superfície do côndilo mandibular foi realizada considerando-se a severidade da osteoartrite, por meio do escore proposto por Pritzker et al. (2006). Realizou-se a quantificação de colágeno tipo I na camada da cartilagem articular por meio da coloração de Picrossírius, sob efeito de luz polarizada. Os animais foram mortos nos tempos de 20, 40 e 60 dias após a cirurgia. Resultados: A severidade da osteoartrite observada na articulação temporomandibular dos animais do grupo teste no tempo de 60 dias foi comparativamente menor em relação ao grupo teste no tempo de 20 dias e ao grupo controle no tempo de 60 dias. Observou-se um grau maior na severidade da OA no grupo teste de 20 dias em comparação ao grupo controle no mesmo tempo avaliado. A quantidade de colágeno tipo I na camada de cartilagem do grupo controle foi menor em relação ao grupo teste, principalmente na região anterior do côndilo mandibular no grupo controle de 60 dias. Conclusão: A condilotomia é uma técnica cirúrgica eficaz na redução da severidade da osteoartrite quimicamente provocada na superfície condilar da ATM de coelhos. O colágeno tipo III, predominante na camada de cartilagem das articulações com osteoartrite, foi substituído por colágeno tipo I, após a realização da condilotomia.Background: Osteoarthritis (OA) is a degenerative joint disease, associated with low-grade inflammation. Treatment involves non-surgical and surgical options, depending on the severity of OA. Condylotomy is an alternative procedure that does not require articular interposition, in which an oblique osteotomy of the mandibular condyle is performed to guide the fracture. After surgery, the condyle shifts to an anterior-inferior position, with disk recapture, allowing joint functionality and repair process. Purpose: This study aimed to evaluate the effects of condylotomy on tissue structures of the temporomandibular joint (TMJ) condyle in rabbits with chemically induced OA. Materials and methods: Animals with chemically induced temporomandibular joint (TMJ) degeneration were divided into two groups: control group (n=15), which followed the experimental group as for the time points when deaths occurred; and experimental group (n=15), which underwent surgical fracture guided by osteotomy of the mandibular condyle 40 days after disease induction. Histological analysis of the articular surface of the mandibular condyle was performed considering the severity of OA, using the grading system proposed by Pritzker et al. (2006). The Picrosirius-polarization method was used to quantify type I collagen in the articular cartilage. The animals were killed 20, 40 and 60 days after surgery. Results: The severity of OA in the TMJ of experimental animals at day 60 was comparatively lower than that of experimental animals at day 20 and controls at day 60. Experimental animals showed a higher OA severity grade than controls at day 20. The amount of type I collagen in the articular cartilage of control animals was lower than that of experimental animals, especially in the anterior region of the mandibular condyle of controls at day 60. Conclusion: Condylotomy is an effective surgical technique for reducing the severity of chemically induced OA in the condylar surface of the rabbit TMJ. Type III collagen, which predominates in osteoarthritic articular cartilage, was replaced by type I collagen after condylotomy was performed.
Books on the topic "Mandibular condylar cartilage"
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Growth of the costochondral junction and its potential applicability for the reconstruction of the mandibular condyle. Turku: Turun yliopisto, 1993.
Find full textBook chapters on the topic "Mandibular condylar cartilage"
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Athanasiou, Kyriacos A., Alejandro A. Almarza, Michael S. Detamore, and Kerem N. Kalpakci. "Cartilage of the Mandibular Condyle." In Tissue Engineering of Temporomandibular Joint Cartilage, 41–45. Cham: Springer International Publishing, 2009. http://dx.doi.org/10.1007/978-3-031-02577-8_3.
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Takeshita, Nobuo, Takashi Murakami, Tomohiro Fukunaga, Koichi Hiratsuka, Yoshimitsu Abiko, Takashi Yamashiro, and Teruko Takano-Yamamoto. "Expression of Ten-m/Odz3 in the Fibrous Layer of Mandibular Condylar Cartilage and the Early Stage of Chondrogenic Differentiation of ATDC5 Cells." In Interface Oral Health Science 2011, 102–3. Tokyo: Springer Japan, 2012. http://dx.doi.org/10.1007/978-4-431-54070-0_20.
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Cortez, S., J. L. Alves, and A. Completo. "Influence of porosity and cell density on tissue engineering of mandibular condylar cartilage." In Biodental Engineering IV, 101–5. CRC Press, 2017. http://dx.doi.org/10.1201/9781315164892-22.
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Cortez, S., S. Cortez, J. L. Alves, and A. Completo. "Effects of dynamic compression on cells in tissue engineering of mandibular condylar cartilage." In Biodental Engineering IV, 107–10. CRC Press, 2017. http://dx.doi.org/10.1201/9781315164892-23.
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Atkinson, Martin E. "The temporomandibular joints, muscles of mastication, and the infratemporal and pterygopalatine fossae." In Anatomy for Dental Students. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199234462.003.0033.
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It is essential that dental students and practitioners understand the structure and function of the temporomandibular joints and the muscles of mastication and other muscle groups that move them. The infratemporal fossa and pterygopalatine fossa are deep to the mandible and its related muscles; many of the nerves and blood vessels supplying the structures of the mouth run through or close to these areas, therefore, knowledge of the anatomy of these regions and their contents is essential for understanding the dental region. The temporomandibular joints (TMJ) are the only freely movable articulations in the skull together with the joints between the ossicles of the middle ear; they are all synovial joints. The muscles of mastication move the TMJ and the suprahyoid and infrahyoid muscles also play a significant role in jaw movements. The articular surfaces of the squamous temporal bone and of the condylar head (condyle) of the mandible form each temporomandibular joint. These surfaces have been briefly described in Chapter 22 on the skull and Figure 24.1A indicates their shape. The concave mandibular fossa is the posterior articulating surface of each squamous temporal bone and houses the mandibular condyle at rest. The condyle is translated forwards on to the convex articular eminence anterior to the mandibular fossa during jaw movements. The articular surfaces of temporomandibular joints are atypical; they covered by fibrocartilage (mostly collagen with some chondrocytes) instead of hyaline cartilage found in most other synovial joints. Figures 24.1B and 24.1C show the capsule and ligaments associated with the TMJ. The tough, fibrous capsule is attached above to the anterior lip of the squamotympanic fissure and to the squamous bone around the margin of the upper articular surface and below to the neck of the mandible a short distance below the limit of the lower articular surface. The capsule is slack between the articular disc and the squamous bone, but much tighter between the disc and the neck of the mandible. Part of the lateral pterygoid muscle is inserted into the anterior surface of the capsule. As in other synovial joints, the non-load-bearing internal surfaces of the joint are covered with synovial membrane.
Conference papers on the topic "Mandibular condylar cartilage"
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Hagandora, Catherine K., and Alejandro J. Almarza. "A Comparison of the Mechanical Properties of the Goat Temporomandibular Joint Disc to the Mandibular Condylar Cartilage in Unconfined Compression." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53173.
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The temporomandibular joint (TMJ) is a synovial, bilateral joint formed by the articulation of the condyle of the mandible and the articular eminence and glenoid fossa of the temporal bone. The articulating tissues of the joint include the TMJ disc and the mandibular condylar cartilage (MCC). It is estimated that 10 million Americans are affected by TMJ disorders (TMDs), a term encompassing a variety of conditions which result in positional or structural abnormalities in the joint. [1] Characterization of the properties of the articulating tissues of the joint is a necessary prequel to understanding the process of pathogenesis as well as tissue engineering suitable constructs for replacement of damaged joint fibrocartilage. Furthermore, the current literature lacks a one-to-one comparison of the regional compressive behavior of the goat MCC to the TMJ disc.