16 research outputs found

    Influence of examiners’ experience on the reproducibility of different gold standard techniques and histological criteria for validation of the diagnosis of occlusal caries lesions

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    The aims of this study were to evaluate the influence (1) of the examiner experience and (2) three histological classification criteria on the reproducibility of two gold standard techniques (non-dye or dye) for validation of the diagnosis of occlusal caries. This study comprised a sample of 210 digital images of 105 permanent teeth (105 rhodamine B dyed and 105 dyefree hemisections) and six examiners. Images were evaluated on a laptop computer and categorised according to three different histological classification criteria (proposed by Ekstrand, Lussi or Downer) and repeated in order to allow reproducibility calculation. For data analysis, the six participants were divided into two groups: G1: examiners with previous experience in histological evaluation and G2: examiners with no experience in histological evaluation. Statistical significance was set at 0.05. Results. The mean intraexaminer reproducibility values in G1 were higher than G2 in all variables. Intra-examiner reproducibility was lower for the dye-free technique in both groups. The mean values of inter-examiner reproducibility in G1 ranged from 0.60 to 0.68, and in G2 values ranged from 0.34 to 0.69. Conclusion. It can be concluded that: (1) the examiners’ experience seems to influence the reproducibility of the two gold standard techniques studied and reproducibility tends to be lower when the dye-free technique is used, and (2) the histological classification criterion does not appear to influence the reproducibility for validation of the diagnosis of occlusal caries

    Influence of isolation technique on the survival of resin-modified glass-ionomer restorations in primary molars : a 9-months randomized controlled trial

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    Objective: To compare the survival of occlusal and occlusal-proximal restorations performed with resinmodified glass-ionomer cement (RMGIC) in deciduous molars using rubber dam and cotton rolls isolation. Material and Methods: Ninety-two patients were included and 200 deciduous molars with cavitated occlusal or occlusoproximal dentin caries lesions were randomized into two groups: cotton rolls (n = 100) and rubber dam (n = 100) and RMGIC restorations were placed. At baseline and in the follow-up visit, presence, severity and activity of caries lesions were registered. Two independent, blinded examiners evaluated the treated teeth clinically using the USPHS criteria and radiographically after 9 months. Descriptive analysis, survival curve (log-rank test) and Cox regression were performed to assess risk factors related to failure. Results: Out of the 179 teeth (92 cotton rolls group and 87 rubber dam group) evaluated at 9-month follow-up period. No lesion progression was observed radiographically. The overall treatment success rate was 85.47% (83.47% for cotton rolls and 87.35 rubber dam group). No significant difference between isolation methods was observed in the log-rank test (p = 0.16). Cox regression showed no risk factors related to failure. Conclusion: No difference was found in the survival of occlusal and occlusalproximal restorations performed with RMGIC in deciduous molars using a rubber dam and cotton rolls isolation after a 9-month follow-up period

    Desempenho do DIAGNODent Pen na detecção e no monitoramento de lesÔes artificiais de cårie não cavitadas em superfícies lisas

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    Este trabalho teve como objetivo avaliar o desempenho da fluorescĂȘncia a laser (DIAGNOdent pen, Kavo, Alemanha) na detecção e no monitoramento de lesĂ”es de cĂĄrie nĂŁo cavitadas induzidas artificialmente. Foram utilizados 52 blocos de esmalte de dentes bovinos, os quais foram submetidos a dois ciclos de desmineralização utilizando cepas de S. mutans, L. casei e A. naeslundii. Cada espĂ©cie foi cultivada em ĂĄgar sangue por 48 horas. Recipientes com 30 ml de TSB com 0,5% de sacarose e 0,4 ppm de flĂșor receberam 10ml cada do inĂłculo multiespĂ©cie. Esses recipientes receberam os blocos e foram incubados por 48 horas. ApĂłs esta etapa os blocos foram adicionados individualmente a tubos contendo NaCl a 0,9% cada e agitados por 30 segundos. ApĂłs cada ciclo de desmineralização, os blocos tiveram suas superfĂ­cies submetidas ao sistema de espectroscopia RAMAN. Antes e apĂłs cada ciclo de desmineralização os blocos foram submetidos Ă s medidas de microdureza superficial (Knoop) e de fluorescĂȘncia a laser foram realizadas. Os valores mĂ©dios de microdureza (±DP) foram 319,3 ± 21,5 (inicial), 80,5 ± 31,9 (1Âș ciclo) e 39,8 ± 12,7 (2Âș ciclo), com diferença estatisticamente significante entre os trĂȘs perĂ­odos. (teste t; p<0,01). Os valores de fluorescĂȘncia foram 4,3 ± 1,5 (inicial), 7,5 ± 9,4 (1Âș ciclo) e 7,1 ± 7,1 (2Âș ciclo), diferindo os perĂ­odos inicial e 1Âș ciclo (teste t; p=0,014). NĂŁo foi observada correlação (Coeficiente de Pearson) entre as medidas de fluorescĂȘncia e a variação da microdureza (ΔKHN) nos trĂȘs perĂ­odos de avaliação. Pode-se concluir que a fluorescĂȘncia a laser foi efetiva em detectar a primeira desmineralização dos blocos de esmalte, porĂ©m nĂŁo foi efetiva em monitorar sua progressĂŁo apĂłs dois ciclos de desmineralização.The aim of this study was to evaluate the performance of a laser fluorescence device (DIAGNOdent pen, Kavo, Germany) to detect and to monitor the progression of caries-like lesions on smooth surfaces. Fifty-two bovine enamel blocks were submitted to two cycles of caries lesion induction using S. mutans, L. casei and A. naeslundii. Before and after each cycle, enamel blocks were analyzed under RAMAN espectroscopy, knoop superficial microhardness and laser fluorescence. Average values of superficial microhardness (±SD) were 319,3 ± 21,5 (baseline), 80,5 ± 31,9 (1Âș cycle) e 39,8 ± 12,7 (2Âș cycle) and statistical significant difference was found among all periods (t test; p<0,01). Fluorescence values were 4,3 ± 1,5 (baseline), 7,5 ± 9,4 (1Âș cycle) e 7,1 ± 7,1 (2Âș cycle), with difference between baseline and 1Âș cycle (t test; p=0,014). Any correlation (Pearson) was observed between fluorescence and superficial microhardness values. It can be concluded that laser fluorescence was effective in detecting the first demineralization on the enamel blocks, however the method did not show any effect in monitoring lesions progression after two cycles of demineralization

    Selamento de lesÔes cariosas proximais em molares decíduos com infiltrante resinoso : estudo clínico controlado de boca dividida

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    O objetivo deste estudo clĂ­nico controlado de boca dividida foi avaliar longitudinalmente a progressĂŁo radiogrĂĄfica de lesĂ”es de cĂĄrie em superfĂ­cies proximais de molares decĂ­duos apĂłs o selamento com infiltrante resinoso em crianças de 3 a 8 anos. Foram incluĂ­dos neste estudo 16 pacientes que possuĂ­am no mĂ­nimo duas lesĂ”es em superfĂ­cie proximal de molares decĂ­duos, com imagem radiogrĂĄfica atĂ© o terço externo de dentina. As lesĂ”es foram alocadas de forma aleatĂłria em dois grupos: teste (infiltrante resinoso) e controle (sem infiltrante). Os pacientes foram avaliados clinicamente quanto a presença de placa visĂ­vel (IPV), sangramento gengival (ISG) e exame visual de cĂĄrie. Radiografias digitais interproximais foram realizadas em todos os pacientes, de ambas as lesĂ”es. Todos os pacientes receberam tratamento para a atividade de cĂĄrie que consistiu em aconselhamento dietĂ©tico, instrução de higiene bucal incluindo fio dental e quatro aplicaçÔes tĂłpicas de flĂșor. Ao final de 3 meses de acompanhamento os exames foram repetidos e as radiografias digitais foram comparadas utilizando a imagem original e dois filtros de tratamento de imagem a fim de observar presença ou ausĂȘncia de progressĂŁo radiogrĂĄfica das lesĂ”es dos grupos teste e controle. Em um total de 16 pacientes (64 radiografias digitais usando cada filtro) nĂŁo foi observada diferença estatisticamente significante entre os grupos teste e controle (teste McNemar, p=1,00), apesar de ter sido observada uma tendĂȘncia de progressĂŁo das lesĂ”es em ambos os grupos. Diferenças significativas (teste Wilcoxon, p=0,01) foram observadas entre IPV inicial (30,5 ±22,0) e final (14,0 ± 7,5) e entre ISG inicial (13,5 ±18,5) e final (2,8 ± 3,4). NĂŁo foi observada relação significante entre IPV, ISG e risco Ă  carie com a progressĂŁo radiogrĂĄfica das lesĂ”es (Teste Mann Whitney, p>0,05). Este estudo mostrou que nĂŁo houve diferença significante na progressĂŁo de lesĂ”es de cĂĄrie em superfĂ­cies proximais seladas com infiltrante resinoso comparadas com tratamento placebo no perĂ­odo de tempo avaliado.The prevalence of proximal caries lesions in primary molars is high in many countries. This split-mouth placebo-controlled randomized clinical trial aimed to assess the progression of early proximal caries lesions on primary molars after resin infiltration. Sixteen children aged 3 to 8 years old took part of this study. Participants had to have at least two proximal lesions radiographically extending to enamel or outer dentine. Visual examination was performed after tooth separation. Digital bitewing radiographs were taken, visual plaque (VPI) and gingival bleeding indexes (GBI) were recorded and visual examination of caries was performed (baseline assessments). Proximal lesions were randomly allocated to two groups: resin infiltration (test) and no infiltration (control). All patients received 4-week topical fluoride application, dietary counseling, toothbrushing and flossing instructions. After a 3 months follow-up period, baseline assessments of all patients were repeated and digital radiographs were taken. Original digital images and enhanced images, using two different filters, were compared aiming the observation of lesion progression in both test and control groups. Evaluation of digital radiographs of the 16 children (64 digital images for each filter) showed no statistical significant differences (McNemar test, p=1,00) when test and control groups were compared. However, a tendency of lesion progression could be observed in both groups. Significant differences (Wilcoxon t-test, p=0.01) were observed for VPI between baseline (30.5 ±22.0) and follow-up (14.0 ±7.5) and for GBI at baseline (13.5 ±18.5) and follow-up (2.8 ± 3.4). No significant relation between lesion progression and VPI, GBI and caries experience was observed (Mann Whitney Test, p>0.05). This study showed no significant differences in the progression of resin infiltrated proximal caries lesions compared to the placebo treatment in this follow-up period

    Selamento de lesÔes cariosas proximais em molares decíduos com infiltrante resinoso : estudo clínico controlado de boca dividida

    No full text
    O objetivo deste estudo clĂ­nico controlado de boca dividida foi avaliar longitudinalmente a progressĂŁo radiogrĂĄfica de lesĂ”es de cĂĄrie em superfĂ­cies proximais de molares decĂ­duos apĂłs o selamento com infiltrante resinoso em crianças de 3 a 8 anos. Foram incluĂ­dos neste estudo 16 pacientes que possuĂ­am no mĂ­nimo duas lesĂ”es em superfĂ­cie proximal de molares decĂ­duos, com imagem radiogrĂĄfica atĂ© o terço externo de dentina. As lesĂ”es foram alocadas de forma aleatĂłria em dois grupos: teste (infiltrante resinoso) e controle (sem infiltrante). Os pacientes foram avaliados clinicamente quanto a presença de placa visĂ­vel (IPV), sangramento gengival (ISG) e exame visual de cĂĄrie. Radiografias digitais interproximais foram realizadas em todos os pacientes, de ambas as lesĂ”es. Todos os pacientes receberam tratamento para a atividade de cĂĄrie que consistiu em aconselhamento dietĂ©tico, instrução de higiene bucal incluindo fio dental e quatro aplicaçÔes tĂłpicas de flĂșor. Ao final de 3 meses de acompanhamento os exames foram repetidos e as radiografias digitais foram comparadas utilizando a imagem original e dois filtros de tratamento de imagem a fim de observar presença ou ausĂȘncia de progressĂŁo radiogrĂĄfica das lesĂ”es dos grupos teste e controle. Em um total de 16 pacientes (64 radiografias digitais usando cada filtro) nĂŁo foi observada diferença estatisticamente significante entre os grupos teste e controle (teste McNemar, p=1,00), apesar de ter sido observada uma tendĂȘncia de progressĂŁo das lesĂ”es em ambos os grupos. Diferenças significativas (teste Wilcoxon, p=0,01) foram observadas entre IPV inicial (30,5 ±22,0) e final (14,0 ± 7,5) e entre ISG inicial (13,5 ±18,5) e final (2,8 ± 3,4). NĂŁo foi observada relação significante entre IPV, ISG e risco Ă  carie com a progressĂŁo radiogrĂĄfica das lesĂ”es (Teste Mann Whitney, p>0,05). Este estudo mostrou que nĂŁo houve diferença significante na progressĂŁo de lesĂ”es de cĂĄrie em superfĂ­cies proximais seladas com infiltrante resinoso comparadas com tratamento placebo no perĂ­odo de tempo avaliado.The prevalence of proximal caries lesions in primary molars is high in many countries. This split-mouth placebo-controlled randomized clinical trial aimed to assess the progression of early proximal caries lesions on primary molars after resin infiltration. Sixteen children aged 3 to 8 years old took part of this study. Participants had to have at least two proximal lesions radiographically extending to enamel or outer dentine. Visual examination was performed after tooth separation. Digital bitewing radiographs were taken, visual plaque (VPI) and gingival bleeding indexes (GBI) were recorded and visual examination of caries was performed (baseline assessments). Proximal lesions were randomly allocated to two groups: resin infiltration (test) and no infiltration (control). All patients received 4-week topical fluoride application, dietary counseling, toothbrushing and flossing instructions. After a 3 months follow-up period, baseline assessments of all patients were repeated and digital radiographs were taken. Original digital images and enhanced images, using two different filters, were compared aiming the observation of lesion progression in both test and control groups. Evaluation of digital radiographs of the 16 children (64 digital images for each filter) showed no statistical significant differences (McNemar test, p=1,00) when test and control groups were compared. However, a tendency of lesion progression could be observed in both groups. Significant differences (Wilcoxon t-test, p=0.01) were observed for VPI between baseline (30.5 ±22.0) and follow-up (14.0 ±7.5) and for GBI at baseline (13.5 ±18.5) and follow-up (2.8 ± 3.4). No significant relation between lesion progression and VPI, GBI and caries experience was observed (Mann Whitney Test, p>0.05). This study showed no significant differences in the progression of resin infiltrated proximal caries lesions compared to the placebo treatment in this follow-up period
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