Bioinspired Synthesis of (-)-PF-1018.

The combination of electrocyclizations and cycloadditions accounts for the formation of a range of fascinating natural products. Cascades consisting of 8π electrocyclizations followed by a 6π electrocyclization and a cycloaddition are relatively common. We now report the synthesis of the tetramic acid PF-1018 through an 8π electrocyclization, the product of which is immediately intercepted by a Diels-Alder cycloaddition. The success of this pericyclic cascade was critically dependent on the substitution pattern of the starting polyene and could be rationalized through DFT calculations. The completion of the synthesis required the instalment of a trisubstituted double bond by radical deoxygenation. An unexpected side product formed through 4-exo-trig radical cyclization could be recycled through an unprecedented triflation/fragmentation.

Injectable platelet rich fibrin: cell content, morphological, and protein characterization.

OBJECTIVES: The aim of the present study was to evaluate the blood cell content, morphological aspects, gene expression of type I collagen, and release of growth factors on an injectable platelet rich fibrin (i-PRF). MATERIALS AND METHODS: Blood samples were collected from 15 volunteers to prepare i-PRF samples. Peripheral blood was used as a control group. Blood clot and i-PRF samples were cultured for 10 days. The supernatant of the samples was collected for ELISA immunoassay quantification of PDGF and VEGF growth factors over periods of 1, 8, 24, 72, and 240 h. I-PRF and blood clot samples were biologically characterized using histological and immunohistochemistry analysis for IL-10, osteocalcin, and TGF-ß. Scanning electron microscopy (SEM) was used to inspect the fibrin network and distribution of blood platelets and leukocytes. Reverse transcriptase polymerase chain reaction (RT-PCR) method was used to evaluate gene expression for type I collagen. RESULTS: A higher concentration of platelets and lymphocytes was recorded in i-PRF than in peripheral blood (p < 0.05). The release of VEGF was higher in blood clot samples (1933 ± 704) than that for i-PRF (852 ± 376; p < 0.001). Immunohistochemistry showed upregulation of TGF-B, IL-10, and osteocalcin in the i-PRF group. RT-PCR showed increased type I collagen gene expression in i-PRF (p < 0.05). SEM images revealed agglomeration of platelets in some regions, while a fibrin networking was noticeable in the entire i-PRF sample. CONCLUSIONS: Injectable platelet rich fibrin becomes a good approach for soft and mineralized tissue healing considering the formation of a three-dimensional fibrin network embedding platelets, leukocytes, type I collagen, osteocalcin, and growth factors. Indeed, the injectable platelet rich fibrin can be indicated in several medical applications regarding bioactivity, simplied technique, and flowable mixing with other biomaterials. CLINICAL RELEVANCE: Morphological, cell, and protein characterization of platelet rich fibrin provides a better understanding of the clinical effects and improvement of clinical guidelines for several medical applications. Once well physicochemical and biologically characterized, the use of an injectable platelet rich fibrin can be extended to other applications in the field of orthopedics, periodontics, and implant dentistry on the repairing process of both soft and mineralized tissues.

Fibrina rica em plaquetas injetável (I-PRF): caracterização celular, morfológica e proteica / Injectable platelet-rich fibrin (I-PRF): cellular, morphological and protein characterization

Estudos experimentais demonstram o efeito da fibrina rica em plaquetas (PRF) nas técnicas de regeneração tecidual otimizando o processo de reparo; podendo ser utilizada na forma líquida (i-PRF). O objetivo dessa pesquisa foi determinar a composição celular do i-PRF, caracterizar sua morfologia a nível microscópico, investigar a expressão de proteínas envolvidas no processo de reparo e avaliar sua interação com um material biocerâmico a partir de um modelo in vitro. Materiais e métodos: Foram colhidas amostras sanguíneas de 15 voluntários humanos para comparação dos constituintes celulares entre o i-PRF e o sangue periférico. Amostras de i-PRF e de coágulos sanguíneos foram cultivadas in vitro durante 10 dias. O sobrenadante das amostras foi colhido nos intervalos 1h, 8h, 24h, 3 dias e 10 dias para quantificação dos fatores de crescimento PDGF-AB e VEGF por ELISA. Amostras foram tratadas histologicamente para caracterização morfológica e submetidas à marcação imuno-histoquímica para as proteínas IL-10, OC e TGF-ß. Investigou-se a expressão gênica do fator de transcrição Colágeno tipo 1. Foram preparadas amostras do i-PRF misturadas com cerâmica bioativa granulada (HA/ß-TCP) para avaliação da interação entre esses compostos através MEV. Resultados: Observou-se maior concentração de leucócitos (8.124 ± 1.419) e plaquetas (3.96x105 ± 0.72) no i-PRF em comparação ao sangue periférico (p <0.001), com uma maior proporção de linfócitos (60%) no i-PRF. Maiores níveis de VEGF foram liberados a partir do coágulo sanguíneo (1933 ± 704) em relação ao i-PRF (852 ± 376; p <0.001). Não foram observadas diferenças entre os níveis de PDGF-AB. Ensaio imuno-histoquímico demonstrou imunomarcação para TGF-ß, IL-10 e Osteocalcina no grupo i-PRF. Análises por RT-PCR demonstraram aumento da expressão de Colágeno tipo 1 no grupo do i-PRF. Microscopicamente observou-se a formação de grandes aglomerados de plaquetas e fibrina e uma rede de fibrina em distribuição tridimensional espacial com a presença de linfócitos distribuídos de forma homogênea. As imagens por MEV apresentaram boa integração entre os grânulos de cerâmica e a malha de fibrina formada pelo i-PRF. Conclusões: Análises morfológicas revelaram que o processo de produção do i-PRF resulta em uma rede tridimensional de fibrina a qual incorpora plaquetas, leucócitos, colágeno tipo I, osteocalcina e fatores de crescimento. Assim, o i-PRF torna-se uma boa abordagem como um material líquido para ser associado a outros biomateriais (AU).

One of the great challenges of clinical research is the development of new biomaterials that aid in tissue regeneration and accelerate the healing process. Experimental studies demonstrate the effect of platelet rich fibrin (PRF) on tissue regeneration techniques thereby optimizing the repair process, and can also be used in liquid form (i-PRF). The objective of this research was to determine the cellular composition of i-PRF, to characterize its morphology at a microscopic level, to investigate the expression of proteins involved in the repair process and to evaluate its interaction with a bioceramic material from an in vitro model. Materials and methods: Blood samples were collected from 15 human volunteers to compare the cellular constituents between i-PRF and peripheral blood. I-PRF and blood clot samples were cultured in vitro for 10 days. The supernatant of the samples was collected at intervals of 1h, 8h, 24h, 3 days and 10 days for quantification of PDGF-AB and VEGF growth factors by ELISA. Samples were histologically treated for morphological characterization and submitted to the immunohistochemical methodology for the labeling of IL-10, OC and TGF-ß proteins. The gene expression of collagen transcription factor type 1 was investigated. I-PRF samples mixed with granular bioactive ceramics (HA/ß-TCP) were prepared to evaluate the interaction between these compounds through SEM. Results: A higher concentration of leukocytes (8.124 ± 1.419) and platelets (3.96x105 ± 0.72) in i-PRF compared to peripheral blood (p <0.001) was observed, with a higher proportion of lymphocytes (60%) in i-PRF. Higher levels of VEGF were released from the blood clot (1933 ± 704) compared to i-PRF (852 ± 376; p <0.001); no differences were observed between PDGF-AB levels. Immunohistochemical assay demonstrated expression for TGF-ß, IL-10 and Osteocalcin in the i-PRF group. RT-PCR analysis showed increased expression of collagen type 1 in the i-PRF group. The formation of large platelets, fibrin clusters and a fibrin network in a three-dimensional spatial and homogeneous distribution were observed microscopically. SEM images showed good integration between the ceramic granules and the fibrin mesh formed by i-PRF. Conclusions: Morphological analyses revealed that the slow polymerization of i-PRF results in a three-dimensional fibrin network embedding platelets, leukocytes, type I collagen, osteocalcin, and growth factors. Thus, i-PRF becomes a good approach as an injectable material to be associated with other biomaterials (AU).

Aumento horizontal de rebordo utilizando osso xenógeno, L-PRF e membrana D-PTFE com reforço de titânio / Horizontal alveolar ridge augmentation using xenogeneic bone, L-PRF and titanium-reinforced d-PTFE barrier

O objetivo deste trabalho é descrever uma técnica cirúrgica de regeneração óssea guiada (ROG) para aumento horizontal de rebordo, na qual foram utilizados membrana de PTFE associado ao L-PRF e enxerto ósseo particulado, em conjunto com o I-PRF. A ROG tem como finalidade recuperar as estruturas ósseas perdidas após a remodelação tecidual decorrente de exodontias. A utilização de membranas de d-PTFE permite a manutenção do espaço para a maturação do enxerto ósseo. O L-PRF atua como fonte de fatores de crescimento e leucócitos, estimulando simultaneamente, e de forma sincronizada, a neoformação óssea e a maturação do tecido gengival. A técnica descrita é mais uma alternativa disponível como opção para reconstrução de rebordos alveolares atróficos.

The aim of this article is to describe a surgical technique of guided bone regeneration (GBR) for horizontal alveolar ridge augmentation in which PTFE barriers are used in association with L-PRF and particulated bone graft associated to I-PRF. The objective of GBR is reconstructing missed bone structures after tissue remodelling due to teeth removal. The use of d-PTFE barrier allows space maintenance for bone graft maturation. L-PRF acts as source of growth factor and leukocytes stimulating synchronized and simultaneous bone neoformation and gingival tissue maturation. The described technique is another available alternative as an option to restore atrophic alveolar ridge.

Efeitos da azilsartana sobre a doença periodontal em um modelo experimental com ratos wistar / Effects of azilsartan on periodontal disease in an experimental model in Wistar rats

As doenças periodontais possuem alta prevalência na população mundial e manifestam-se, principalmente, em duas entidades distintas, a saber: a gengivite induzida pela placa bacteriana e a periodontite. A periodontite é uma doença inflamatória crônica caracterizada pela destruição em vários níveis do osso alveolar, fibras colágenas e do cemento, é considerada importante causa de perda dentária em adultos. Estudos experimentais recentes demonstram o efeito anti-inflamatório e antirreabsortivo dos fármacos anti-hipertensivos da classe dos bloqueadores dos receptores de angiotensina II sobre a doença periodontal. O objetivo desse estudo foi avaliar os efeitos da azilsartana (AZT) um potente inibidor dos receptores de angiotensina II que apresenta efeitos adversos mínimos, sobre a perda óssea alveolar, inflamação, expressão das metaloproteinases da matriz (MMP), ligante do receptor do fator nuclear kapa B (RANKL), receptor ativador do fator nuclear kapa B (RANK), osteoprotegerina (OPG), ciclooxigenase-2 (COX-2), Interleucina 10, Interleucina 1β, TNF-α, glutationa (GSH) e catepsina K no modelo de doença periodontal induzida por ligadura em ratos.

Foram utilizados 100 ratos wistar sendo divididos randomicamente em 5 grupos com 20 ratos cada: (1) não foi induzida a doença periodontal, água destilada, (2) indução da doença periodontal, água destilada; (3) indução da doença periodontal, AZT 1 mg/kg; (4) indução da doença periodontal, AZT 5 mg/kg; e (5) indução da doença periodontal, AZT 10 mg/kg. Todos os grupos foram tratados com água destilada ou AZT por 10 dias. Os tecidos periodontais foram submetidos às análises morfométrica, histopatológica e imunohistoquímica para detecção de MMP-2, MMP-9, RANKL, RANK, OPG e catepsina K. Níveis de IL-1β, IL-10, TNF-α foram determinados por ELISA e níveis de mieloperoxidase(MPO) e glutationa(GSH) por espectrofotoscopia de UV visível. O tratamento com AZT 5 mg/kg reduziu o MPO (p <0.05) e IL-1β (p <0.05), elevou os níveis de IL-10 (p <0.05), reduziu a expressão de MMP-2, MMP-9, RANK, RANKL, catepsina K, e elevou a expressão de OPG. Os achados revelam que a AZT na dosagem 5mg/kg apresenta ação anti-inflamatória na doença periodontal induzida por ligadura reduzindo a perda óssea alveolar, diminuindo os níveis de citocinas pró-inflamatórias e elevando a expressão de agentes anti-inflamatórios. (AU)

Periodontal diseases, highly prevalent disease in worldwide population, manifest primarily in two distinct entities: plaque-induced gingivitis and periodontitis. Periodontitis is a chronic inflammatory disease characterized of different levels of collagen, cementum, and alveolar bone destruction. Recent experimental studies demonstrated anti-inflammatory and antirreabsortive effect of antihypertensive agents of the angiotensin II receptor blockers class on periodontal disease. The aim of this study was to evaluate the effects of azilsartan (AZT), a potent inhibitor of the angiotensin II receptor which has minimal adverse effects on bone loss, inflammation, and the expression of matrix metallo proteinases (MMPs), receptor activator of nuclear factor kB ligand (RANKL), receptor activator of nuclear factor kB (RANK), osteoprotegerin (OPG), cyclooxygenase-2 (COX-2), and cathepsin K in periodontal tissue in a rat model of ligature-induced periodontitis. Male Wistar albino rats were randomly divided into 5 groups of 20 rats each: (1) nonligated, water; (2) ligated, water; (3) ligated, 1 mg/kg AZT; (4) ligated, 5 mg/kg AZT; and (5) ligated, 10 mg/kg AZT. All groups were treated with water or AZT for 10 days. Periodontal tissues were analyzed by morphometric exam, histopathology and immunohistochemical detection of MMP-2, MMP-9, COX-2, RANKL, RANK, OPG, and cathepsin K. Levels of IL-1b, IL-10, TNF-a, myeloperoxidase (MPO), and glutathione (GSH) were determined by ELISA. Treatment with 5 mg/kg AZT resulted in reduced MPO (p˂0.05) and IL-1b (p˂0.05) levels and increased in Il-10 levels (p˂0.05). It was observed a reduced expression of MMP-2, MMP-9, COX-2, RANK, RANKL, cathepsin K, and a increased expression of OPG in the animals subjected to experimental periodontitis and threated with AZT (5 mg/kg). Conclusions: These findings suggest an anti-inflammatory and anti-reabsortive effects of AZT on ligature-induced periodontitis in rats. (AU)

Shifts in subsistence type and its impact on the human skull's morphological integration.

OBJECTIVE: Here we evaluate morphological integration patterns and magnitudes in different skull regions to detect if shifts in morphological integration are correlated to the appearance of more processed (softer) diets. METHODS: To do so, three transitional populations were analyzed, including samples from groups that inhabited the same geographical region and for which the evidence shows that major changes occurred in their subsistence mode. Ninety three-dimensional landmarks were digitized on 357 skulls and used as the raw data to develop geometric morphometric analyses. The landmark coordinates were divided into several different regions of biomechanical interest, following a three-level hierarchically nested scheme: the whole skull, further subdivided into neurocranium (divided into the vault and basicranium), the facial (divided into the lower and upper facial), and the masticatory apparatus (divided into alveolar, temporal, and temporo-mandibular joint). RESULTS: Our results indicate that the morphological integration and variability patterns significantly vary across skull regions but are maintained across the transitions. The alveolar border and the lower facial are the regions manifesting greater value of morphological integration and variability, while the upper facial, the temporo-mandibular joint, and the basicranium are highly integrated and poorly variable. CONCLUSIONS: The transition to softer diets increased morphological variation across cranial regions that are more exposed to masticatory strains effects.

Azilsartan reduced TNF-α and IL-1ß levels, increased IL-10 levels and upregulated VEGF, FGF, KGF, and TGF-α in an oral mucositis model.

Oral mucositis (OM) is a common complication of treatments for head and neck cancer, particularly radiotherapy with or without chemotherapy. OM is characterised by oral erythema, ulceration, and pain. The aim of this study was to evaluate the effect of azilsartan (AZT), an angiotensin II receptor antagonist, on 5-fluorouracil (5-FU)-induced oral mucositis (OM) in Syrian hamsters. OM was induced by the intraperitoneal administration of 5-FU on experimental days 1 (60 mg/Kg) and 2 (40 mg/Kg). Animals were pretreated with oral AZT (1, 5, or 10 mg/kg) or vehicle 30 min before 5-FU injection and daily until day 10. Experimental treatment protocols were approved by the Animal Ethics Committee Use/CEUA (Number 28/2012) of the UFRN. Macroscopic analysis and cheek pouch samples were removed for histopathologic analysis. Myeloperoxidase (MPO), Malonyldialdehyde (MDA), interleukin-1 beta (IL-1ß), interleukin-10 (IL-10), and tumour necrosis factor-alpha (TNF-α) were analysed by Enzyme Linked Immuno Sorbent Assay (ELISA). Vascular endothelial growth factor (VEGF), fibroblast growth factor (FGF), keratinocyte growth factor (KGF), and transforming growth factor (TGF)-α were measured by immunohistochemistry. Analysis of variance followed by Bonferroni's test was used to calculate the means of intergroup differences (p ≤ 0.05). Treatment with 1 mg/kg AZT reduced levels MPO (p<0.01), MDA (p<0.5) and histological inflammatory cell infiltration, and increased the presence of granulation tissue. AZT treatment at 1 mg/kg reduced the TNF-α (p<0.05) and IL-1ß (p<0.05) levels, increased the cheek pouch levels of IL-10 (p<0.01), and upregulated VEGF, FGF, KGF, and TGF-α. Administration of AZT at higher doses (5 and 10 mg/kg) did not significantly reverse the OM. AZT at a dose of 1 mg/kg prevented the mucosal damage and inflammation associated with 5-FU-induced OM, increasing granulation and tissue repair.

Azilsartan increases levels of IL-10, down-regulates MMP-2, MMP-9, RANKL/RANK, Cathepsin K and up-regulates OPG in an experimental periodontitis model.

AIMS: The aim of this study was to evaluate the effects of azilsartan (AZT) on bone loss, inflammation, and the expression of matrix metallo proteinases (MMPs), receptor activator of nuclear factor κB ligand (RANKL), receptor activator of nuclear factor κB (RANK), osteoprotegerin (OPG), cyclooxygenase-2 (COX-2), and cathepsin K in periodontal tissue in a rat model of ligature-induced periodontitis. MATERIALS AND METHODS: Male Wistar albino rats were randomly divided into 5 groups of 10 rats each: (1) nonligated, water; (2) ligated, water; (3) ligated, 1 mg/kg AZT; (4) ligated, 5 mg/kg AZT; and (5) ligated, 10 mg/kg AZT. All groups were treated with saline or AZT for 10 days. Periodontal tissues were analyzed by histopathology and immunohistochemical detection of MMP-2, MMP-9, COX-2, RANKL, RANK, OPG, and cathepsin K. Levels of IL-1ß, IL-10, TNF-α, myeloperoxidase (MPO), and glutathione (GSH) were determined by ELISA. RESULTS: Treatment with 5 mg/kg AZT resulted in reduced MPO (p<0.05) and IL-1ß (p<0.05), increased levels of IL-10 (p<0.05), and reduced expression of MMP-2, MMP-9, COX-2, RANK, RANKL, cathepsin K, and increased expression of OPG. CONCLUSIONS: These findings reveal that AZT increases anti-inflammatory cytokines and GSH and decreases bone loss in ligature-induced periodontitis in rats.

Enxerto de conjuntivo em implantes imediatos na região anterior / Connective graft in immediate implants in the anterior region - literature review

A evolução da Implantodontia está relacionada com o restabelecimento dos aspectos funcionais e estéticos dos pacientes que apresentam ausências dentárias, principalmente em regiões anteriores superiores. A devolução ou preservação da estética dos pacientes reabilitados com implantes dentários têm permitido o emprego de novas abordagens cirúrgicas, e a sua avaliação ajuda a determinar o comportamento dos tecidos peri-implantares. Desta forma, este artigo teve o objetivo de apresentar uma revisão de literatura referente ao uso do enxerto de tecido conjuntivo, associado a implantes imediatos na região estética, e discutir suas indicações e previsibilidade. De acordo com os estudos analisados, sugere-se que o uso de implantes imediatos em região anterior, associado à colocação do enxerto de tecido conjuntivo subepitelial, pode melhorar o aspecto estético da região anterior superior. Desta forma, esta pode ser uma opção de tratamento para reabilitação daqueles casos em que a função e a estética devem ser priorizadas.

Previsibilidade do recobrimento radicular de recessão gengival classe III de Miller – uma revisão de literatura / Predictability of root coverage of Miller Class III gingival recessions- Review of the literature

As recessões gengivais têm sido consideradas um dos principais objetivos da terapia cirúrgica periodontal com a intenção de atingir a cobertura completa da raiz. Diversas modalidades de tratamento têm sido desenvolvidas, mas poucas técnicas podem obter a cobertura total da raiz em uma recessão gengival classe III de Miller. A solução para o recobrimento de superfícies radiculares expostas a este nível envolve a realização de um procedimento cirúrgico bem executado e por um grau de previsibilidade ainda mais crítico. Diante do exposto, o objetivo deste artigo foi avaliar, por meio de uma revisão de literatura, a previsibilidade e taxas de recobrimento radicular em recessões gengivais Classe III. Os resultados dos estudos mais recentes revelaram que as taxas de sucesso de recobrimento radicular têm aumentado, próximo a 80%, semelhante às técnicas para recessões Classes I e II. Apesar dos poucos estudos disponíveis, tem havido uma modificação na indicação dos procedimentos de recobrimento radicular, modifcação da previsibilidade da sua utilização e melhora dos resultados alcançados. Torna-se uma abordagem disponível ao tratamento das recessões gengivais com perda de inserção interdental

Gingival recessions have been considered one of the main goals of periodontal surgical therapy in attempt to achieve full root coverage. Several treatment modalities have been developed, but few techniques can achieve full root coverage in a Miller class III gingival recession. The solution for the covering of exposed root surfaces at this level involves a well performed surgical procedure and a predictability even more critical. According to this, the aim of this paper was to evaluate, through a literature review, the predictability and rates for root coverage in Miller Class III gingival recessions. The results of recent studies have shown that the success rate has increased root coverage percentage, close to 80%, similar to techniques for Classes I and II gingival recessions. Despite the few studies available, there has been a change in the indication for root coverage procedures as well as the predictability of its use and the results achieved have increased. It becomes an available approach for the treatment of gingival recessions with interdental attachment loss

Avaliação do tecido peri-implantar comparando as técnicas com retalho e sem retalho: revisão da literatura / Evaluation of peri-implant tissue comparing techniques with flap and flapless: literature review

Na tentativa de preservação dos tecidos mole e duro, a implantodontia tem optado por uma abordagem cirúrgica sem retalho (técnica flapless). Essa técnica minimamente invasiva destaca-se por suas vantagens como menor sangramento durante a cirurgia, menor tempo cirúrgico e melhor pós-operatório para o paciente. Diante disto, o objetivo desta revisão de literatura é trazer informações sobre o comportamento dos tecidos Peri-implantares nas reabilitações implantossuportadas bem como comparar as técnicas cirúrgicas com e sem retalho. Realizou-se uma busca na base de dados Pubmed/Medline e foram incluídos na revisão estudos clínicos controlados que apresentaram relevância clínica publicados no período de 2008 a 2013. De acordo com os resultados, pode-se observar que a técnica sem retalho proporciona a manutenção da mucosa peri-implantar ao redor dos implantes. Entretanto, não existe diferença significativa quanto à perda óssea entre as técnicas estudadas. Além disso, ambas apresentaram previsibilidade nos resultados do tratamento com implantes. Pode-se concluir que não existem estudos clínicos controlados em longo prazo suficientes quanto à utilização da técnica flapless, entratanto, os resultados em curto prazo sugerem que é uma técnica previsível

In an attempt to preserve the soft and hard tissues, implant dentistry has opted for a flapless surgical approach (flapless technique). This minimally invasive technique is distinguished by its advantages such as less bleeding during surgery, shorter operative time and best postoperative for the patient. Hence, the purpose of this literature review is to provide information about the behavior of the peri-implant tissues in implant restorations and to compare surgical techniques with and without flaps. A search was conducted in the database PubMed/Medline and controlled clinical trials that showed clinical relevance published in the period 2008-2013 were included in this review. According to the results, it could be observed that the flapless surgical approach provides maintenance of the peri-implant mucosa around implants. However, no significant difference in bone loss between techniques was also observed. Besides that, both techniques, with or without flaps, showed predictability in the results of implant treatment. It can be concluded that there are not enough controlled clinical studies regarding the long term use of flapless technique. However, short term results suggest that it is a predictable technique

Progression of non-cavitated lesions in dentin through a nonsurgical approach: a preliminary 12-month clinical observation.

OBJECTIVE: Considering the minimally invasive approach to dentistry, the scientific community has focused on non-invasive treatments for caries lesions. The aim of this study was to evaluate the efficacy of a nonsurgical approach to arrest occlusal non-cavitated dentin lesions through glass ionomer sealing. METHODS: In this controlled clinical trial, 51 teeth with clinically non-cavitated occlusal caries radiographically located beneath the enamel-dentine junction (radiolucent area) were selected among patients presenting a moderate to high risk of caries. The teeth were randomly divided into two groups: an experimental group receiving an application of Vidrion-R (SS White) glass ionomer and a control group not submitted to any clinical intervention. Caries progression was monitored by clinical and radiographic examination at 4-monthly intervals over a period of one year. In addition, marginal integrity of the sealant was evaluated in the experimental group. RESULTS: Clinical examination showed no statistical difference between the groups (P=.13). On the other hand, sealed teeth presented lower caries progression when analyzed by radiographic examination (P=.004). CONCLUSION: A glass ionomer sealant over non-cavitated occlusal caries lesions in dentin may not be sufficiently effective in arresting their progression.