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1.
Chinese Journal of Reparative and Reconstructive Surgery ; (12): 526-532, 2023.
Article in Chinese | WPRIM | ID: wpr-981626

ABSTRACT

OBJECTIVE@#To review the research progress of bone graft resorption after Latarjet procedure for the treatment of recurrent anterior shoulder dislocation, and provide a guide for further research on bone graft resorption.@*METHODS@#The relevant literature in recent years was extensively reviewed. The pathogenesis, classification, risk factors, clinical function impact, and management of bone graft resorption after Latarjet procedure for the treatment of recurrent anterior shoulder dislocation were summarized.@*RESULTS@#Bone graft resorption is the common complication after Latarjet procedure for the treatment of recurrent anterior shoulder dislocation. Stress shielding and poor blood supply may contribute to the occurrence of bone graft resorption. The absence of significant preoperative glenoid bone loss, open procedure, earlier graft healing may to be the risk factors for bone graft resorption. Various assessment methods and classification systems are used to evaluate the region and severity of bone graft resorption. Partial resorption may be considered as a natural glenoid remodeling process after the surgery, but severe and complete resorption is proved to be one of the reasons for failed procedures and there is no effective measure to prevent it, except for accepting revision surgery.@*CONCLUSION@#The pathogenesis, risk factors, clinical function impact of bone graft resorption after Latarjet procedure for the treatment of recurrent anterior shoulder dislocation has not been fully elucidated and there is a lack of effective management strategies, so further clinical and basic researches are needed.


Subject(s)
Humans , Shoulder Joint/surgery , Shoulder Dislocation/surgery , Joint Instability/surgery , Bone Resorption/pathology , Bone Transplantation , Recurrence
2.
Chinese Medical Journal ; (24): 1642-1652, 2023.
Article in English | WPRIM | ID: wpr-980931

ABSTRACT

Cellular immune responses as well as generalized and periarticular bone loss are the key pathogenic features of rheumatoid arthritis (RA). Under the pathological conditions of RA, dysregulated inflammation and immune processes tightly interact with skeletal system, resulting in pathological bone damage via inhibition of bone formation or induction of bone resorption. Single-cell omics technologies are revolutionary tools in the field of modern biological research.They enable the display of the state and function of cells in various environments from a single-cell resolution, thus making it conducive to identify the dysregulated molecular mechanisms of bone destruction in RA as well as the discovery of potential therapeutic targets and biomarkers. Here, we summarize the latest findings of single-cell omics technologies in osteoimmunology research in RA. These results suggest that single-cell omics have made significant contributions to transcriptomics and dynamics of specific cells involved in bone remodeling, providing a new direction for our understanding of cellular heterogeneity in the study of osteoimmunology in RA.


Subject(s)
Humans , Osteoclasts/physiology , Arthritis, Rheumatoid/pathology , Inflammation/pathology , Bone and Bones/pathology , Bone Resorption/pathology
3.
Natal; s.n; 18 maio 2021. 54 p. tab, ilus, graf.
Thesis in Portuguese | LILACS, BBO | ID: biblio-1537220

ABSTRACT

Foi proposito desse trabalho analisar a eficiência na manutenção óssea alveolar após extração dentária pelo biomateral xenógeno (Hemospon®) por meio de imagens tomográficas pré e pósoperatórias de 1 mês e 18 meses de acompanhamento. Trata-se de um estudo clínico controlado, randomizado e cego, onde foram realizadas 18 exodontias, e os alvéolos dentários tratados foram selecionados de forma randomizada e divididos em dois grupos. O grupo 1, grupo teste (G1) foi inserido esponja de colágeno xenógena (porco) e o grupo controle (G2), foi mantido apenas o coágulo sanguíneo local. Os alvéolos foram analisados nos sentidos horizontais e verticais e os resultados foram avaliados através dos testes de Wilcoxon e Mann-Whitney, assumindo uma significância estatística de p<0,05. Além das análises tomográficas os pacientes foram acompanhados diariamente na primeira semana para verificar se os tecidos locais apresentavam possíveis complicações, como a presença de infecção, fistulas e dor persistente. Os resultados iniciais (1 mês) constataram que numa análise em conjunto avaliando altura (p<,0,863), comprimento total (p<1,000) e espessura total do alvéolo (p<0,222), não foram observadas diferenças significativas entre os grupos teste e controle, respectivamente. Na análise de 18 meses, observa-se diferença estatística (p < 0,05) em relação a espessura total do alvéolo, porém em relação ao comprimento total do alvéolo e a altura alveolar não foram observados diferenças estatisticamente significativas (p = 0,36; p = 0,674 ­ respectivamente). Quando de compara-se o G1 em momentos diferentes 1 mês e 18 meses em relação as variáveis observa-se diferenças estatísticas significativas no comprimento total do alvéolo e na espessura (p<0,05), porém não houve signicancia em relação à altura do alvéolo (p=0,575). Analisando em separado cada variável em relação aos grupos G1 e G2 não houve diferença estatística numa análise após 18 meses (p = 0,773 ­ altura alveolar e espessura alveolar; p = 1 ­ comprimento total do alvéolo). Durante o acompanhamento clínico em ambos os grupos não houve diferença no padrão do processo de reparo tecidual, sendo possível reabilitação oral dos pacientes. Mediante os dados preliminares apresentados, a pesquisa demonstrou que os alvéolos tratados com esponja de colágeno porcina (Hemospon®) tiveram perdas ósseas menores, principalmente em relação a espessura, podendo-se inferir que há indícios de uma manutenção alveolar com o uso do biomaterial, podendo ser um biomaterial em potencial e de baixo custo para preservação alveolar, sem aumentar os índices de complicações, porém sugere-se uma análise de uma amostra maior para uma melhor análise estatística (AU).


The purpose of this work was to analyze the efficiency of alveolar bone maintenance after tooth extraction by xenogenous biomaterial (Hemospon®) by means of pre and postoperative tomographic images of 1 month and 18 months of follow-up. This is a controlled, randomized, blinded, clinical study, in which 18 extractions were performed, and the treated dental alveolo were randomly select and devided into two groups. Group 1 test group (G1) a xenogen collagen sponge (pig) was inserted and the control grouop (G2), only the local blood clot was maintained. The alveoli were analyzed in the horizontal and vertical directions and the results were evaluated using the Wilcoxon and Mann ­ Whitney tests assumig a statistical significance of p<0,05. In addition to tomographic analyzes, patients were followed up daily in the first week to check whether local tissues had possible complications such as the presence of infection fistulas and persistent pain. The initial results (1 month) found that in a joint analysis evaluanting height (p<0,863) total length (p<1,00) and total thickness of the socket (p<0,222), no significant differences were observed between the test groups and control respectively. When G1 is compared at different times 1 month and 18 months in relation to the variables there are statistically significant differences in the total length of the alveolus and in the thickness (p<0,05) but there was no significance in relation to the height of the alveolus (p = 0,575). Analyzing each variable separately in relation to groups G1 and G2 there was no statistical difference in an analysis after 18 months (p=0,773 ­ alveolar height and alveolar thickness; p = 1 ­ total alveolar length). During clinical follow-up in both groups there was no difference in the pattern of the tissue repair process with patients oral rehabilitation being possible. Through the preliminary data presented the research demonstrated that the alveoli treated with porcine collagen sponge (Hemospon®) had smaller bone losses mainly in relation to thickness and it can be inferred that there are signs of alveolar maintenance with the use of biomaterial it can be a potential and low-cost biomaterial for alveolar preservation without increasing the complication rates however an analysis of a larger sample is suggested for a better statistical analysis (AU).


Subject(s)
Humans , Male , Female , Biocompatible Materials , Bone Resorption/pathology , Bone Remodeling , Tooth Socket , Tomography, X-Ray Computed/instrumentation , Statistics, Nonparametric
4.
Int. j. morphol ; 38(1): 129-134, Feb. 2020. tab, graf
Article in English | LILACS | ID: biblio-1056410

ABSTRACT

Menopause complications such as cardiovascular and bone diseases represent a major public health concern. We sought to determine whether a high-fat diet (HFD) can augment ovariectomy-induced bone resorption in a rat model of menopause possibly via the upregulation of the inflammatory biomarkers and dyslipidemia. Rats were either ovariectomized and fed a standard laboratory chow (model group) or were ovariectomized and fed with a HFD for 15 weeks before being sacrificed. Ovariectomy significantly (p<0.05) increased body weight, dyslipidemia, insulin resistance, pro-inflammatory cytokines tumor necrosis factor-a (TNF-α) and interleukin-6 (IL-6), and biomarker of bone resorption, nuclear factor-kB (NF-kB), which were augmented by feeding animals with a HFD. This was confirmed through immunohistochemical study, where ovariectomy induced expression of p65/NF-kB protein in tibia bone sections of the model group, which were augmented by HFD. HFD augments ovariectomy-induced bone resorption through increased inflammatory biomarkers and NF-kB in rats.


Las complicaciones de la menopausia, como las enfermedades cardiovasculares y óseas, representan un importante problema de salud pública. Intentamos determinar si una dieta alta en grasas (HFD) puede aumentar la resorción ósea inducida por ovariectomía en un modelo de menopausia en ratas, a través de la regulación positiva de los biomarcadores inflamatorios y la dislipidemia. Las ratas fueron ovariectomizadas y alimentadas con una comida estándar de laboratorio (grupo modelo) o fueron ovariectomizadas y alimentadas con un HFD durante 15 semanas antes de ser sacrificadas. La ovariectomía aumentó significativamente (p <0,05) el peso corporal, dislipidemia, resistencia a la insulina, citocinas proinflamatorias, factor de necrosis tumoral a (TNF-α) e interleucina-6 (IL-6), y el biomarcador de resorción ósea, factor nuclear-kB (NF-kB), que se aumentaron alimentando animales con un HFD. Esto se confirmó a través del estudio inmunohistoquímico, donde la ovariectomía indujo la expresión de la proteína p65 / NF-kB en secciones de hueso de tibia del grupo modelo, que fueron aumentadas por HFD. HFD aumenta la resorción ósea inducida por ovariectomía a través del aumento de biomarcadores inflamatorios y NF-kB en ratas.


Subject(s)
Animals , Female , Rats , Bone Resorption/pathology , Diet, High-Fat/adverse effects , Triglycerides/analysis , Bone Resorption/etiology , Insulin Resistance , Menopause , Ovariectomy/adverse effects , Rats, Wistar , Disease Models, Animal , Dyslipidemias/complications
5.
Biol. Res ; 50: 28, 2017. tab, graf
Article in English | LILACS | ID: biblio-950879

ABSTRACT

BACKGROUND: The Tridax procumbens extracts (TPE) are known for their ethno-medicinal properties to increase osteogenic functioning in mesenchymal stem cells. Recently, we found that the T. procumbens flavonoids (TPF) significantly suppressed the RANKL-induced osteoclasts differentiation and bone resorption. The TPF also promoted osteoblasts differentiation and bone formation demonstrated by increasing bone formation markers in cultured mouse primary osteoblasts. However, the effects of the TPF on in vivo bone formation remain unclear. In this study, we investigated the effects of the TPF on in vivo bone formation, injected the TPF (20 mg/kg) twice a day in the low calcium diet mice and killed them after 21 day. Radiographic and histomorphometric analyses were performed on the dissected bones to determine the anabolic effects of the TPF. RESULTS: Bone mineral density and bone mineral content of the TPF-treated mice were significantly increased compared to the control mice. Bone formation-related indices like osteoblast number, osteoblast surface, bone volume, mineralizing surface, mineral apposition rate and bone formation rate were significantly increased in the TPF-treated mice compared to the control mice. CONCLUSION: Our findings point towards the stimulation of bone formation by TPF, suggested that the TPF could be a potential natural anabolic agent to treat patients with bone loss-associated diseases such as osteoporosis.


Subject(s)
Animals , Male , Mice , Rats , Osteogenesis/drug effects , Flavonoids/pharmacology , Bone Resorption/drug therapy , Plant Extracts/pharmacology , Bone Density/drug effects , Cell Differentiation/drug effects , Asteraceae/chemistry , Osteoblasts/cytology , Osteoblasts/drug effects , Flavonoids/isolation & purification , Bone Resorption/pathology , Mice, Inbred C57BL
6.
Dental press j. orthod. (Impr.) ; 21(2): 45-50, Mar.-Apr. 2016. tab
Article in English | LILACS | ID: lil-782946

ABSTRACT

ABSTRACT Introduction: Osteoclasts and osteoblasts are responsible for regulating bone homeostasis during which the trace element zinc has been shown to exert a cumulative effect on bone mass by stimulating osteoblastic bone formation and inhibiting osteoclastic bone resorption. Objective: The aim of the present study was to investigate the effects of zinc (Zn) on orthodontic tooth movement (OTM) in a rat model. Material and Methods: A total of 44 male Wistar rats were divided into four groups of 11 animals each and received 0, 1.5, 20 and 50 ppm Zn in distilled water for 60 days. In the last 21 days of the study, nickel-titanium closed coil springs were ligated between maxillary right incisors and first molars of all rats, and tooth movement was measured at the end of this period. Histological analysis of hematoxylin/eosin slides was performed to assess root resorption lacunae, osteoclast number and periodontal ligament (PDL) width. Results: Mean OTM was calculated as 51.8, 49.1, 35.5 and 45 µm in the 0, 1.5, 20 and 50 ppm zinc-receiving groups, respectively. There were no significant differences in neither OTM nor histological parameters among the study groups (p > 0.05). Conclusion: According to the results obtained in the current investigation, increase in supplementary zinc up to 50 ppm does not affect the rate of OTM neither bone and root resorption in rats.


RESUMO Introdução: os osteoclastos e os osteoblastos são responsáveis por regular a homeostase óssea, processo no qual o oligoelemento zinco tem demonstrado exercer um efeito cumulativo sobre a massa óssea, estimulando a formação óssea osteoblástica e inibindo a reabsorção óssea osteoclástica. Objetivo: o objetivo do presente estudo foi investigar os efeitos do zinco (Zn) sobre a movimentação dentária ortodôntica (MDO) em ratos. Métodos: um total de 44 ratos Wistar machos foi dividido em quatro grupos de 11 animais cada, os quais receberam 0; 1,5; 20 e 50ppm de zinco diluído em água destilada, durante 60 dias. Nos últimos 21 dias do estudo, molas helicoidais fechadas de níquel-titânio foram instaladas entre os incisivos direitos e os primeiros molares superiores de todos os ratos, e a movimentação dentária foi medida ao final desse período. Foi realizada análise histológica de cortes corados por hematoxilina-eosina, para avaliar as lacunas de reabsorção radicular, o número de osteoclastos e a espessura do ligamento periodontal. Resultados: as médias da MDO foram estimadas em 51,8; 49,1; 35,5 e 45µm no grupos que receberam, respectivamente, 0; 1,5; 20 e 50ppm de zinco. Não houve diferença significativa entre os grupos experimentais, nem quanto à MDO, nem quanto aos parâmetros histológicos (p > 0,05). Conclusão: segundo os resultados obtidos na presente investigação, verificou-se que um aumento na dose de suplementação com zinco para 50ppm não afeta nem o índice de MDO, nem a reabsorção óssea ou radicular em ratos.


Subject(s)
Animals , Male , Rats , Osteoblasts/drug effects , Tooth Movement Techniques/methods , Zinc/administration & dosage , Bone Resorption/prevention & control , Osteoblasts/pathology , Periodontal Ligament/drug effects , Periodontal Ligament/pathology , Bone Resorption/pathology , Rats, Wistar , Dose-Response Relationship, Drug
7.
Araçatuba; s.n; 2015. 50 p. tab, ilus.
Thesis in Portuguese | LILACS, BBO | ID: biblio-870069

ABSTRACT

Os adesivos a base de cianoacrilato são utilizados em cirurgia oral e maxilofacial para fechamento de feridas cirúrgicas, comunicação buco-sinusal, reparo de fissura labial e osteosíntese do esqueleto craniofacial. O objetivo deste trabalho foi comparar três métodos de fixação (etil-cianoacrilato, n-butil-cianoacrilato ou parafuso de titânio) do enxerto ósseo autógeno (EOA) em bloco. Foram realizadas ostectomias bilaterais na região parietal em trinta coelhos com uma trefina de 6mm para obtenção do EOA. Os EOA em bloco obtidos foram fixados com etil-cianoacrilato (Grupo I), n-butil-cianoacrilato (Grupo II) ou parafuso de titânio (Grupo III). Os animais foram sacrificados nos períodos de cinco, quinze, trinta, sessenta e cento e vinte dias, sendo obtidas amostras da região do EOA. As peças foram processadas em laboratório de acordo com o método histotécnico de rotina e coradas com hematoxilina e eosina. Os eventos histológicos avaliados foram: infiltrado inflamatório, reabsorção do adesivo e neoformação e reabsorção óssea. Os resultados dos eventos celulares foram submetidos ao teste de Kruskal-Wallis, seguido pelo teste de Dunn para determinar as diferenças entre os grupos (p < 0.05). A análise qualitativa ordinal mostrou a presença de infiltrado inflamatório e reabsorção óssea mais significativos nos grupos I e II, principalmente nos períodos iniciais. O infiltrado inflamatório observado no grupo controle foi discreto (p<0.05). O processo de reabsorção do adesivo foi semelhante, não havendo diferença estatística (p>0.05). No período de 120 dias, foi possível observar adesivo na interface EOA-leito receptor. A neoformação óssea foi mais intensa no grupo controle e no período de 120 dias, o EOA em bloco estava totalmente incorporado ao leito receptor. Nos grupos I e II, observou-se neoformação óssea menos intensa em relação ao grupo III (p<0.05). O parafuso de titânio foi o melhor método de fixação do EOA em bloco. Entretanto, os adesivos etil e...


Cyanoacrylates are used in oral and maxillofacial surgery for closure of surgical wounds, oroantral communication, cleft lip repair, and osteosynthesis of the craniofacial skeleton. The aim of this study was compare three fixation methods (ethyl-cyanoacrylate, n-butyl cyanoacrylate or titanium screw) of autogenous onlay bone graft (AOBG). Bilateral ostectomies were made in the parietal region in thirty rabbits using a 6-mm-diameter trephine. The AOBG was fixed with ethyl-cyanoacrylate (Group I), n-butyl cyanoacrylate (Group II) or titanium screw (Group III - control). The animals were sacrificed at five, fifteen, thirty, sixty, and one hundred and twenty days, and the samples were obtained from AOBG region. The processing was done in accordance with the method histotechnical and stained with hematoxylin and eosin. The evaluated histological events were: inflammatory infiltrate, adhesive resorption and bone formation and bone resorption. The results of cellular events were subjected to the Kruskal-Wallis test followed by Dunn’s test to determine differences between groups (p <0.05). The qualitative numerical analysis showed the presence of inflammatory infiltrate and significant bone resorption in groups I and II, especially in the early periods. The inflammatory infiltrate seen in the control group was discrete (p <0.05). The adhesive reabsorption process was similar, with no statistical difference (p> 0.05). After 120 days, we observed residual adhesive between AOBG and host bed. Newly formed bone was more intense in the control group and, at period 120 days the AOBG was completely incorporated into the host bed. In groups I and II, bone formation was less intense in group III (p<0.05 ). The titanium screw was the best method of fixation of the AOBG. However, adhesives ethyl and n-butyl cyanoacrylate are viable alternative to fixation from AOBG.


Subject(s)
Animals , Rabbits , Tissue Adhesives/therapeutic use , Cyanoacrylates/therapeutic use , Fracture Fixation/methods , Bone Remodeling/physiology , Titanium/therapeutic use , Bone Transplantation/methods , Bone Resorption/pathology
8.
Dental press j. orthod. (Impr.) ; 19(6): 93-98, Nov-Dec/2014. tab, graf
Article in English | LILACS | ID: lil-732433

ABSTRACT

OBJECTIVE: This study aimed to assess tissue changes during orthodontic movement after binge-pattern ethanol 20% exposure. METHODS: Male Wistar rats (n = 54) were divided into two groups. The control group (CG) received 0.9% saline solution, while the experimental group (EG) received 20% ethanol in 0.9% saline solution (3 g/kg/day). On the 30th day, a force of 25 cN was applied with a nickel-titanium closed coil spring to move the maxillary right first molar mesially. The groups were further divided into three subgroups (2, 14 and 28 days). Tartrate-resistant acid phosphatase and picrosirius were used to assess bone resorption and neoformation, respectively. Data were compared by two-way ANOVA, Tukey's HSD, Games-Howell and chi-square test. Significance level was set at 5%. RESULTS: There was a decrease in the number of osteoclasts in EG at day 28. The percentage of collagen showed no interaction between group and time. CONCLUSION: Binge-pattern 20% ethanol promoted less bone resorption at the end of tooth movement, thereby suggesting delay in tooth movement. .


OBJETIVO: objetivou-se avaliar as alterações teciduais decorrentes da administração de etanol a 20% no padrão binge, durante o movimento ortodôntico. MÉTODOS: foram utilizados ratos Wistar machos (n = 54), divididos em dois grupos, sendo Grupo Controle (GC), com administração de soro fisiológico a 0,9%; e Grupo e Experimental (GE), com administração de etanol a 20% em soro fisiológico a 0,9%, no volume de 3g/kg/dia. Após o 30º dia de administração, foi aplicada força de 25cN com mola fechada de níquel-titânio para mover o primeiro molar superior direito para mesial. Os grupos foram subdivididos nos subgrupos 2, 14 e 28 dias, correspondendo ao número de dias de movimentação dentária. Utilizou-se as colorações de fosfatase ácida-tartarato resistente e picrosírius para avaliar reabsorção óssea e neoformação óssea, respectivamente. Os dados foram comparados por ANOVA a dois critérios, Tukey HSD e Games-Howell, ao nível de significância de 5%. RESULTADOS: verificou-se diminuição no número de osteoclastos no GE II no 28º dia. A percentagem de colágeno não demonstrou alteração na interação grupo x tempo. CONCLUSÕES: o etanol no padrão binge a 20% promoveu menor reabsorção óssea no final da movimentação dentária, sugerindo atraso na movimentação dentária. .


Subject(s)
Animals , Male , Rats , Binge Drinking/complications , Tooth Movement Techniques/methods , Azo Compounds , Acid Phosphatase/analysis , Alveolar Process/pathology , Bone Resorption/pathology , Bone Resorption/physiopathology , Cell Count , Coloring Agents , Collagen Type I/analysis , Dental Alloys/chemistry , Isoenzymes/analysis , Molar/pathology , Nickel/chemistry , Orthodontic Wires , Osteoclasts/pathology , Osteogenesis/physiology , Periodontal Ligament/pathology , Random Allocation , Rats, Wistar , Time Factors , Titanium/chemistry , Tooth Movement Techniques/instrumentation
9.
Dental press j. orthod. (Impr.) ; 19(2): 96-107, Mar-Apr/2014. tab, graf
Article in English | LILACS | ID: lil-714625

ABSTRACT

Introduction: Nicotine is harmful to angiogenesis, osteogenesis and synthesis of collagen. Objective: The aim of this study was to investigate the effect of nicotine on bone remodeling during orthodontic movement in rats. Methods: Eighty male Wistar rats were randomly divided into three groups: Group C (control), group CM (with orthodontic movement) and group NM (nicotine with orthodontic movement) groups. The animals comprising groups C and CM received 0.9% saline solution while group NM received nicotine solution (2 mg/kg). A nickel-titanium closed-coil spring was used to induce tooth movement. The animals were euthanized and tissue specimens were processed histologically. We quantified blood vessels, Howship's lacunae and osteoclast-like cells present in the tension and compression areas of periodontal ligaments. The extent of bone formation was evaluated under polarized light to determine the percentage of immature/mature collagen. Results: We observed lower blood vessel densities in the NM group in comparison to the CM group, three (p < 0.001) and seven (p < 0.05) days after force application. Osteoclast-like cells and Howship's lacunae in the NM group presented lower levels of expression in comparison to the CM group, with significant differences on day 7 (p < 0.05 for both variables) and day 14 (p < 0.05 for osteoclast-like cells and p < 0.01 for Howship's lacunae). The percentage of immature collagen increased in the NM group in comparison to the CM group with a statistically significant difference on day 3 (p < 0.05), day 7 (p < 0.001), day 14 (p < 0.001) and day 21 (p < 0.001). Conclusions: Nicotine affects bone remodeling during orthodontic movement, reducing angiogenesis, osteoclast-like cells and Howship's lacunae, thereby delaying the collagen maturation process in developed bone matrix. .


Introdução: a nicotina apresenta efeito prejudicial sobre a angiogênese, osteogênese e síntese de colágeno. Objetivo: investigar a ação da nicotina sobre a remodelação óssea durante o movimento dentário induzido em ratos. Métodos: oitenta ratos machos Wistar foram divididos em três grupos: grupo C (sem indução de movimento dentário e sem a ação da nicotina - controle); grupo CM (indução de movimento dentário) e grupo NM (indução de movimento dentário associado à ação da nicotina). Os animais dos grupos C e CM receberam solução salina a 0,9% e os animais do grupo NM receberam nicotina (solução PA a 98% diluída em solução salina a 0,9% estéril) por via subcutânea (2mg/kg). Após a eutanásia dos animais, com 3, 7, 14 e 21 dias de uso da mola ortodôntica, os espécimes teciduais foram processados histologicamente e quantificou-se o número de vasos sanguíneos, lacunas de Howship e células osteoclásticas nos lados de tração e compressão do ligamento periodontal. A neoformação óssea foi avaliada por meio de luz polarizada, para determinar a porcentagem de colágeno maduro e imaturo. Resultados: observou-se que a quantidade de vasos sanguíneos diminuiu no grupo NM, quando comparado ao grupo CM, nos períodos de três (p < 0,001) e sete (p < 0,05) dias. Quanto às células osteoclásticas e lacunas de Howship, o grupo NM apresentou menores níveis de expressão em relação ao grupo CM, com diferença estatisticamente significativa nos períodos de 7 e 14 dias. A porcentagem de colágeno imaturo apresentou-se aumentada no grupo NM, quando comparado ao grupo CM, em todos os períodos analisados, com diferença e...


Subject(s)
Animals , Male , Rats , Alveolar Process/drug effects , Bone Remodeling/drug effects , Nicotine/pharmacology , Periodontal Ligament/drug effects , Tooth Movement Techniques , Alveolar Process/blood supply , Bone Resorption/pathology , Collagen/drug effects , Dental Alloys/chemistry , Dental Cementum/blood supply , Dental Cementum/drug effects , Molar/blood supply , Molar/drug effects , Neovascularization, Physiologic/drug effects , Nickel/chemistry , Orthodontic Wires , Osteoclasts/drug effects , Osteogenesis/drug effects , Periodontal Ligament/blood supply , Random Allocation , Rats, Wistar , Stress, Mechanical , Time Factors , Titanium/chemistry , Tooth Movement Techniques/instrumentation , Tooth Root/blood supply , Tooth Root/drug effects
10.
Full dent. sci ; 4(15): 434-437, June 18, 2013. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-850876

ABSTRACT

A Implantodontia vem evoluindo rapidamente buscando novas técnicas com a finalidade de tornar o implante uma opção mais segura e previsível dentro da Odontologia. Dentre as técnicas, está a instalação imediata de implantes em alvéolos de dentes recém-extraídos. Diversos estudos mostraram que a implantação imediata pode prover um índice de sucesso para osseointegração similar àquele obtido com implantes colocados em sítios com osso maduro, de 92,7% a 98%, apresentando como principais vantagens a estética, pela manutenção da crista óssea alveolar, manutenção dos tecidos gengivais, pela diminuição da reabsorção óssea do alvéolo dentário, menor custo e tempo de tratamento e a eliminação do segundo estágio cirúrgico. Esse artigo relata um caso que foi realizado a exodontia atraumática do elemento 22 com instalação imediata de um implante de corpo único Active Pilar® (Serson Implantes de 3,4 X 13 mm de comprimento), seguido da confecção de provisório imediato


Implantology is evolving rapidly, trying new techniques with the aim of making the implant more secure and predictable in Dentistry. Immediate installation of implants in the alveoli of freshly extracted teeth is one of these techniques. Several studies have shown that immediate placement can result on a successfull rate of osseointegration, similar to that obtained with implants placed insites with mature bone (92.7% to 98%). Its main advantages are aesthetics, maintenance of alveolar bone crest, maintenance of gingival tissues and decreased bone resorption of tooth socket, lower cost and shorter period of treatment, and the elimination of the second stage of treatment. This article reports a case in which it was held an atraumatic tooth extraction of element 22 with immediate installation of a single active implant body (Pilar®-Serson implantsof 3,4X 13 mm in length), followed by the manufacture immediate provisional


Subject(s)
Humans , Female , Surgery, Oral/methods , Surgery, Oral , Immediate Dental Implant Loading , /methods , Dental Implants/methods , Dental Implants , Bone Resorption/diagnosis , Bone Resorption/pathology , Radiography, Dental/methods , Radiography, Dental
11.
Int. j. morphol ; 30(3): 1023-1028, Sept. 2012. ilus
Article in English | LILACS | ID: lil-665519

ABSTRACT

The aim of this research was to evaluate the risk factors related to condylar resorption (CR) after orthognathic surgery. Was realized a systematic review with a search of the literature performed in the electronic databases PubMed, MedLine, Ovid, Cochrane Library for current evidence in the world literature as conducted, and relevant articles were selected in according to inclusion and exclusion criteria and the findings were compared. Eight papers, (follow-up 12 months to 69 months) were including. A sample of 2567 patient with mandible or bi maxillary surgery with an age range from 14 to 46 year old was observed. In 137 patients (5.3 percent) CR was observed , with a 97.6 percent (122) female. CR was related to 118 cases with mandibular deficiencies with high mandibular plane (advancement surgery). CR were present principally in bi maxillary surgery with a 103 cases (75.2 percent) and only two papers show any analysis to the relation with TMJ dysfunction. Current evidence in CR is poor but supports those female patients with mandibular deficiency and high mandibular plane angle submitted to bi maxillary surgery with change in occlusal plane (counterclockwise) are associated with condylar resorption after orthognathic surgery...


El objetivo de esta investigación fue evaluar los factores de riesgo asociados a reabsorción condilar (RC) posterior a cirugía ortognática. Fue realizada una revisión sistemática con una búsqueda de la literatura realizada en bases de dato electrónicos como PubMed, MedLine, Ovid, Cochrane Library buscando actual evidencia en la literatura mundial; artículos relevantes fueron seleccionados según los criterios de inclusión y exclusión, comparando sus resultados. Ocho artículos (tiempo de seguimiento de 12 a 69 meses) fueron incluidos. Se observó una muestra de 2567 pacientes con cirugía mandibular o bimaxilar con una edad de entre 14 y 46 años. En 137 pacientes (5,3 por ciento) se observó reabsorción condilar, siendo el 97,6 por ciento (122 casos) de sexo femenino. La RC fue observada n 118 casos de deficiencia mandibular con un plano mandibular alto (cirugía de avance mandibular). La RC estuvo presente principalmente en cirugías bimaxilares con 103 casos afectados (75,2 por ciento) y solo dos artículos evidenciaron análisis previo de disfunción de ATM. Actualmente la evidencia en RC es limitada pero fundamenta que mujeres con deficiencia mandibular y alto plano mandibular sometidas a cirugía bimaxilar con alteración del plano oclusal (giro horario) son asociadas a la reabsorción condilar después de la cirugía ortognática...


Subject(s)
Humans , Mandibular Condyle , Orthognathic Surgical Procedures/adverse effects , Bone Resorption/etiology , Bone Resorption/pathology , Risk Factors , Temporomandibular Joint Dysfunction Syndrome/etiology , Temporomandibular Joint Dysfunction Syndrome/pathology
12.
J. appl. oral sci ; 20(3): 340-346, May-June 2012. ilus
Article in English | LILACS | ID: lil-643731

ABSTRACT

OBJECTIVES: The Mikania laevigata extract (MLE) (popularly known in Brazil as "guaco") possesses anti-inflammatory properties. In the present study we tested the effects of MLE in a periodontitis experimental model in rats. We also investigated possible mechanisms underlying such effects. MATERIAL AND METHODS: Periodontal disease was induced by a ligature placed around the mandibular first molars of each animal. Male Wistar rats were divided into 4 groups: non-ligated animals treated with vehicle; non-ligated animals treated with MLE (10 mg/kg, daily); ligature-induced animals treated with vehicle and ligature-induced animals treated with MLE (10 mg/kg, daily). Thirty days after the induction of periodontal disease, the animals were euthanized and mandibles and gingival tissues removed for further analysis. RESULTS: Morphometric analysis of alveolar bone loss demonstrated that MLE-treated animals presented a decreased alveolar bone loss and a lower expression of the activator of nuclear factor-κB ligand (RANKL) measured by immunohistochemistry. Moreover, gingival tissues from the MLE-treated group showed decreased neutrophil migration myeloperoxidase (MPO) assay. CONCLUSIONS: These results indicate that MLE may be useful to control bone resorption during progression of experimental periodontitis in rats.


Subject(s)
Animals , Male , Rats , Anti-Inflammatory Agents/pharmacology , Bone Resorption/drug therapy , Mikania/chemistry , Periodontitis/drug therapy , Plant Extracts/pharmacology , RANK Ligand/drug effects , Anti-Inflammatory Agents/therapeutic use , Bone Resorption/metabolism , Bone Resorption/pathology , Disease Models, Animal , Disease Progression , Plant Leaves , Periodontitis/pathology , Plant Extracts/therapeutic use , RANK Ligand/metabolism , Rats, Wistar , Time Factors , Treatment Outcome
13.
Article in English | IMSEAR | ID: sea-140169

ABSTRACT

The objective of any prosthodontic service is to restore the patient to normal function, contour, esthetics, speech, and health. An optimum denture stability is difficult to achieve in conventional complete dentures. This problem is more magnified in mandibular dentures. The design of prostheses to replace lost teeth and resorbed ridges is largely determined by the position and amount of morphological change in the denture-bearing area of the jaws. A neutral zone may be defined as the space where, during function, the forces of the lips and cheeks pressing inward neutralize the forces of the tongue pressing outward. The neutral zone concept implies acquired muscle control, especially by tongue, lips, and cheeks toward the denture stability. Advocates of the neutral zone concept agree that a lack of favorable leverage is observed when teeth are positioned directly over the ridge. By employing the neutral zone concept, the dislodging muscle energy can easily become a retentive and stabilizing force.


Subject(s)
Aged , Bone Resorption/pathology , Centric Relation , Cheek/physiology , Deglutition/physiology , Dental Impression Technique , Dental Occlusion , Denture Bases , Denture Design , Denture Retention , Esthetics, Dental , Humans , Jaw Relation Record , Jaw, Edentulous/rehabilitation , Lip/physiology , Male , Mandible/pathology , Patient Care Planning , Speech/physiology , Tongue/physiology , Vertical Dimension
14.
J. appl. oral sci ; 19(5): 500-504, Sept.-Oct. 2011. ilus, tab
Article in English | LILACS | ID: lil-600840

ABSTRACT

OBJECTIVE: This study evaluated experimentally-induced periapical bone loss sites using digital radiographic and histopathologic parameters. MATERIAL AND METHODS: Twenty-seven Wistar rats were submitted to coronal opening of their mandibular right first molars. They were radiographed at 2, 15 and 30 days after the operative procedure by two digital radiographic storage phosphor plates (Digora®). The images were analyzed by creating a region of interest at the periapical region of each tooth (ImageJ) and registering the corresponding pixel values. After the sacrifice, the specimens were submitted to microscopic analysis in order to confirm the pulpal and periapical status of the tooth. RESULTS: There was significant statistically difference between the control and test sides in all the experimental periods regarding the pixel values (two-way ANOVA; p<0.05). CONCLUSIONS: The microscopic analysis proved that a periapical disease development occurred during the experimental periods with an evolution from pulpal necrosis to periapical bone resorption.


Subject(s)
Animals , Rats , Bone Resorption , Dental Pulp Necrosis , Periapical Diseases , Bone Resorption/pathology , Bone Resorption , Dental Pulp Necrosis/pathology , Dental Pulp Necrosis , Periapical Diseases/pathology , Periapical Diseases , Radiographic Image Enhancement , Rats, Wistar , Radiography, Dental, Digital/methods , Time Factors
15.
Natal, RN; s.n; 20110808. 114 p. (BR).
Thesis in Portuguese | LILACS, BBO | ID: lil-602584

ABSTRACT

A doença períodontal é uma infecção oral iniciada por periodonlopatógenos que desencadeiam a resposta imune culminando com a destruição tecidual. Essa destruição é mediada pelo hospedeiro através da indução da produção e ativação de enzimas lííicas, citocinas e da estimulação da osteoclastogênese. O objetivo deste estudo foi comparar a expressão imuno-histoquímica dos fatores envolvidos na reabsorção óssea, RANKL (Ligante do Receptor Ativador do Fator Nuclear kappa B), OPG (Osteoprotegerina) e TNF-a (Fator de Necrose Tmnoral Alfa) entre a gengiva clinicamente saudável, a gengivite e a periodontite crônica, corretacionando-os com os parâmetros clínicos periodontais. A amostra consistiu de 83 casos, sendo 12 de gengivas clinicamente saudáveis. 42 de gengivite e 29 de periodontite, oriundos de 74 pacientes adolescentes e adultos com idade média de 35 anos, sem alterações sistêmicas e não fumantes, predominantemente do sexo feminino e da raça parda. Não houve diferença estatisticamente significativa para expressão do anticorpo anti-RANKL (p=0,58t) e da razão RANK.L/OPG (p=Ü,334) quando se comparou as três condições clínicas, mas o anti-OPG e anti-TNF-a mostraram diferenças estatisticamente significativas entre os tipos de lesão (p=0,001 epO.001, respectivamente), revelando maior imunoexpressão na periodontite. Nos casos de periodontite, a variável perda de inserção clínica (P1C) mostrou diferença estatisticamente significativa e correlação positiva, respectivamente, com a imunomarcação dos anticorpos anti-RANKL (p=0,002; p=0,00! e r=0,642), anti-OPG (p=0,018; p=Ü,014 e 1=0,451), anti-TNF-a (p=0,032; p=0,0t4 e r=0,453) e com a razão percentual de RANKL/OPG {p=0,018; p=0,002 e r=0,544). A mobilidade dentária (MB) apresentou diferença estatisticamente significativa somente com a imunoexpressão do anti-RANKL (p=G,Q26). e a profundidade de sondagem (PS) apresentou correlação positiva com o anti-RANKL (p=0.028 e r=0.4G9), ambos nos casos de periodontite...


Subject(s)
Humans , Male , Female , Adolescent , Adult , Cytokines , Periodontal Diseases/diagnosis , Periodontal Diseases/etiology , NF-kappa B , Osteoprotegerin , Receptor Activator of Nuclear Factor-kappa B , Bone Resorption/pathology , Immunohistochemistry , Statistics, Nonparametric
16.
Natal; s.n; 2011. 113 p. (BR).
Thesis in Portuguese | LILACS, BBO | ID: lil-605603

ABSTRACT

A doença períodontal é uma infecção oral iniciada por periodonlopatógenos que desencadeiam a resposta imune culminando com a destruição tecidual. Essa destruição é mediada pelo hospedeiro através da indução da produção e ativação de enzimas lííicas, citocinas e da estimulação da osteoclastogênese. O objetivo deste estudo foi comparar a expressão imuno-histoquímica dos fatores envolvidos na reabsorção óssea, RANKL (Ligante do Receptor Ativador do Fator Nuclear kappa B), OPG (Osteoprotegerina) e TNF-a (Fator de Necrose Tmnoral Alfa) entre a gengiva clinicamente saudável, a gengivite e a periodontite crônica, corretacionando-os com os parâmetros clínicos periodontais. A amostra consistiu de 83 casos, sendo 12 de gengivas clinicamente saudáveis. 42 de gengivite e 29 de periodontite, oriundos de 74 pacientes adolescentes e adultos com idade média de 35 anos, sem alterações sistêmicas e não fumantes, predominantemente do sexo feminino e da raça parda. Não houve diferença estatisticamente significativa para expressão do anticorpo anti-RANKL (p=0,58t) e da razão RANK.L/OPG (p=Ü,334) quando se comparou as três condições clínicas, mas o anti-OPG e anti-TNF-a mostraram diferenças estatisticamente significativas entre os tipos de lesão (p=0,001 epO.001, respectivamente), revelando maior imunoexpressão na periodontite. Nos casos de periodontite, a variável perda de inserção clínica (P1C) mostrou diferença estatisticamente significativa e correlação positiva, respectivamente, com a imunomarcação dos anticorpos anti-RANKL (p=0,002; p=0,00! e r=0,642), anti-OPG (p=0,018; p=Ü,014 e 1=0,451), anti-TNF-a (p=0,032; p=0,0t4 e r=0,453) e com a razão percentual de RANKL/OPG {p=0,018; p=0,002 e r=0,544)...


Periodontal disease is an mfection initiated by oral periodontal pathogens tliat Trigger an immune response culminating in tissue destruction, This destruction is mediated by tine host by inducing the production and activation oflytic en/.ynies, cytokines and the stimiilalion of osteoclastogenesis. The aim of this shidy was to compare the imnujnohistochemical expression of factors involved in boné resorption, RANKL (Ligand Receptor Activator of Nuclear Factor kappa B), OPG (Osteoprotegerin) and TNF-tx (tumor necrosis factor alpha) between the gingival healthy, gingivitis and chronic periodontitis and correlate them with clinica! parameíers. The sampie consisted of 83 cases and 12 ciinicalíy heaithy gums, 42 gingivitis and 29 periodontitis, from 74 adoiescent and adult patients with a mean age of 35 years, without systemic changes and non-smokers, predominantly fema!e and race brown. There was no statistically significant difference for the expression of anti-RANKL {p = 0.581) and RANKL / OPG ratio (p = 0.334) when comparing the three conditions, but the anti-OPG and anti-TNF-a showed statistically significam between the types of injury (p = 0.001 and p <0.0017 respectively), showing greatest expression in periodontitis. In cases of periodontitis. the variable clinicai attachtnent loss (P1C) was statistically significant and positive correlation, respectively, with immunostainingof anti-RANKL {p = 0.002, p = 0.0ÓI and r = 0.642), anti-OPG (p = 0.018, p = 0.014 and r = 0.451), ami-TNF-a (p = 0.032, p = 0.014 and r = 0.453) and the percentage ratio of RANKL / OPG (p = 0.018, p = 0.002 and r = 0.544)...


Subject(s)
Humans , Male , Female , Adolescent , Adult , Cytokines , Periodontal Diseases/etiology , Immunohistochemistry , Osteoprotegerin , Receptor Activator of Nuclear Factor-kappa B , Bone Resorption/pathology , Statistics, Nonparametric
17.
Rev. venez. cir. ortop. traumatol ; 42(2): 29-38, dic. 2010. ilus, tab
Article in Spanish | LILACS | ID: lil-592399

ABSTRACT

Se realizó un estudio observacional descriptivo en 43 caderas intervenidas por artroplastia total no cementada en el Hospital Universitario de Los Andes entre Enero de 2007 y Agosto de 2009, para determinar la correlación existente entre los índices corticodiafisario (ICD), corticometafisario (ICM) y la relación canal-cálcar (CC) preoperatorios con la pérdida ósea periprotésica evaluada mediante densitometría ósea (DEXA) postoperatoria en las zonas de Gruen. Se incluyó igualmente como variable interviniente el uso del ácido zoledrónico en dosis de 5 mg postoperatorios en 24 de los casos para determinar su asociación al aumento de la densidad mineral ósea periprotésica. Se obtuvo correlación entre el índice corticometafisario y la densidad mineral ósea en las zonas 1 y 7 de Gruen, y entre la relación canal-cálcar y la densidad mineral ósea en la zona 2 de Gruen. Por otra parte, el uso del ácido zoledrónico mostró aumento de la densidad mineral ósea en la zona 1 de Gruen.


This is a descriptive observational study of 43 hips which underwent uncemented total arthroplasty at Los Andes University Hospital since January 2007 to August 2009, to determinate correlation among preoperatory corticodiaphysary index (CDI), corticometaphysary index (CMI) and canal to calcar ratio (CCR) with periprosthetic bone loss evaluated through postoperatory bone densitometry (DEXA) in the seven Gruen´s zones. Use of postoperatory 5 mg of zoledronic acid in 24 cases was included as intervening variant to determinate its association with increase in periprosthetic bone mineral density. Correlation was obtained between corticometaphysary index and bone mineral density in Gruen´s zones 1 and 7, and canal to calcar ratio and bone mineral density in Gruen´s zone 2. Besides, it was show increased bone mineral density in Gruen´s zone 1, in patients who received zoledronic acid.


Subject(s)
Humans , Male , Female , Arthroplasty, Replacement, Hip/methods , Densitometry/methods , Diaphyses/pathology , Osteoarthritis, Hip/surgery , Osteoarthritis, Hip/diagnosis , Osteoporosis/diagnosis , Bone Resorption/pathology
18.
Bauru; s.n; 2010. 186 p. ilus, tab, graf.
Thesis in Portuguese | LILACS, BBO | ID: lil-599157

ABSTRACT

A preservação da arquitetura óssea alveolar, durante o processo de reparo do alvéolo dentário após exodontias, é um grande desafio clínico. É esperado que 40 a 60% do volume ósseo alveolar inicial sejam perdidos nos primeiros seis meses. O OsteoScaf é um novo substituto ósseo, desenvolvido pela Universidade de Toronto e representa uma alternativa promissora para a manutenção da integridade óssea alveolar nesse cenário. Esse material é uma matriz tridimensional trifásica reabsorvível e osteocondutiva, composta por ácido polilático-co-glicólico e duas fases de fosfato de cálcio reabsorvível. Com o objetivo de avaliar se o OsteoScaf poderia reduzir a perda óssea durante a fase de reparação/remodelação alveolar após a exodontia, quando comparado com o controle (apenas coágulo sanguíneo), foram implantados cilindros desse material (com duas porosidades diferentes - poros grandes e poros pequenos) em alvéolos de dentes anteriores superiores humanos, imediatamente após a exodontia. Dez pacientes (32 alvéolos) fizeram parte deste estudo, onde 16 alveólos receberam o implante de OsteoScaf e 16 foram usados como controle. Foram feitas tomografias computadorizadas de feixe cônico (TCFC) imediatamente após a exodontia e também aos 120 dias pós-operatóro, quando foram realizadas biópsias ósseas analisadas por microtomografia computadorizada (microTC) e microscopia. A análise quantitativa das microTCs mostraram mais trabéculas ósseas e menor espaço entre elas, com OsteoScaf de poros menores. A análise quantitativa das TCFC indicou menor perda óssea no grupo experimental, principalmente o OsteoScafTM de poros maiores. A avaliação qualitativa dos cortes histológicos mostrou neoformação óssea justaposta ao material, demonstrando sua natureza osteocondutiva. Nossas observações mostraram que o OsteoScaf (de poros pequenos ou grandes) reduziu a perda óssea alveolar durante o processo de reparação/remodelação óssea pós-exodôntica, aos 120 dias de...


Preserving alveolar bone architecture during socket healing is a significant clinical challenge. It is expected that 40% to 60% of the initial alveolar bone volume will be lost up to 6 months after tooth extraction. OsteoScaf is a novel bone substitute material developed at the University of Toronto and represents a promising alternative for maintaining alveolar bone integrity in this clinical scenario. It is a resorbable, osteoconductive, 3-phase composite scaffold comprising poly(lactide-co-glycolide) and 2 osteoclast-resorbable calcium phosphate phases. Our hypothesis was that OsteoScaf lithomorphs (10x3mm cylinders), placed in fresh extraction sockets, would reduce post-extraction bone loss compared to sockets with coagulum alone (control). Thus, we placed OsteoScaf (of two different porosities small and large pores) in fresh extraction sockets of maxillary anterior teeth in humans. A total of 10 patients (32 sockets) were included in the study, of which 16 sockets were grafted with OsteoScaf and 16 were used as control. Cone Beam Computer Tomography (CBCT) was performed both immediately following extraction and also at 120 days postoperatively, at which time biopsy samples were also harvested for micro computer tomography (µCT) and histological analyses. Quantitative analysis of the µCT showed more bone trabeculae and smaller trabecular separation in the experimental group than control, specifically with small pore scaffolds. In addition, quantitative analysis of CBCT showed less bone resorption in the OsteoScafTM groups, especially with the large pore scaffolds. Qualitative histological analysis showed new bone tissue in direct apposition to the scaffold demonstrating its osteoconductive nature. Our observations showed that the OsteoScafTM groups (small and large pores) reduced alveolar bone loss after 120 days of socket healing in humans. Grants: CAPES (Brazil) and TRT (Canada).


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Tooth Socket/physiology , Bone Matrix , Bone Resorption/pathology , Bone Substitutes/therapeutic use , Analysis of Variance , Cone-Beam Computed Tomography , Surgery, Oral , Bone Transplantation/physiology
20.
Rev. bras. otorrinolaringol ; 73(1): 123-127, jan.-fev. 2007.
Article in Portuguese | LILACS | ID: lil-449717

ABSTRACT

O colesteatoma adquirido da orelha média causa erosão óssea, com altas taxas de morbidade e mortalidade. O TNF-alfa (TNF-alfa) lambda uma das principais citocinas envolvidas neste processo. OBJETIVO: Avaliar o papel do TNF-alfa na reabsorsão óssea e a ação dele no colesteatoma. MATERIAL E MÉTODOS: Foi realizado um levantamento e uma revisão crítica da literatura. RESULTADOS: Todos os autores estudados concordam com a importância do TNF-alfa no processo de reabsorção óssea presente no colesteatoma e com o grau de destruição observado. Diferentes trabalhos demonstraram que o TNF-alfa é capaz de provocar erosão óssea, através de diferentes vias de ação. Ele pode estimular a diferenciação e a maturação dos osteoclastos ou, ainda, agir na matriz óssea expondo-a à ação dos osteoclastos. Existe a possibilidade de inibir a ação do TNF-alfa, diminuindo seus efeitos e prevenindo a perda óssea em doenças como a artrite reumatóide. Não existe, entretanto, trabalhos específicos em colesteatoma. Não existe consenso sobre a sua localização. Estas diferenças, provavelmente, ocorrem devido à distribuição dos receptores. CONCLUSÃO: O TNF-alfa, presente no colesteatoma promove a reabsorsão óssea, juntamente com outras citocinas (RANKL e IL-1), estando relacionado com a presença de complicações.


Cholesteatoma may cause bone erosion, with high morbidity and mortality rates. Tumor Necrosis Factor -Alpha (TNF-a) is one of the main cytokines involved in this process. Our goal was to evaluate the role of TNF-a in Bone Resorption and its effect on cholesteatoma. MATERIAL AND METHODS: analysis and critical literature review. RESULTS: Different studies have demonstrated that TNF-a is capable of causing bone erosion. It may stimulate the differentiation and maturation of osteoclasts or it may act on the bone matrix, exposing it to the action of the osteoclasts. It is possible to inhibit TNF-a, reducing its effects and prevent bone loss in illnesses such as rheumatoid arthritis,and there has been no specific investigation regarding cholesteatomas. All studies agree on the importance of TNF-a in the bone resorption process present in cholesteatomas, and on the degree of destruction observed; however, there is no consensus as to its location. These differences are probably due to receptor site. CONCLUSION: TNF-a, present in cholesteatomas, promotes bone resorption, along with other cytokines (RANKL and IL-1) related to complications.


Subject(s)
Humans , Bone Resorption/metabolism , Cholesteatoma, Middle Ear/metabolism , Tumor Necrosis Factor-alpha/metabolism , Bone Resorption/pathology , Cholesteatoma, Middle Ear/pathology
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