RESUMO
OBJECTIVE: To be fit-for-purpose, oral health-related quality of life instruments must possess a range of psychometric properties which had not been fully examined in the 16-item Short Form Child Perceptions Questionnaire for children aged 11 to 14 years (CPQ11-14 ISF-16). We used advanced statistical approaches to determine the CPQ's measurement accuracy, precision, invariance and dimensionality and analyzed whether age range could be extended from 8 to 15 years. METHODS: Fit to the Rasch model was examined in 6648 8-to-15-year-olds from Australia, New Zealand, Brunei, Cambodia, Hong Kong, Malaysia, Thailand, Germany, United Kingdom, Brazil and Mexico. RESULTS: In all but two items, the initial five answer options were reduced to three or four, to increase precision of the children's selection. Items 10 (Shy/embarrassed) and 11 (Concerned what others think) showed an 'extra' dependency between item scores beyond the relationship related to the underlying latent construct represented by the instrument, and so were deleted. Without these two items, the CPQ was unidimensional. The three oral symptoms items (4 Food stuck in teeth, 3 Bad breath and 1 Pain) were required for a sufficient person-item coverage. In three out of 14 items (21 %), Europe and South America showed regional differences in the patterns of how the answer options were selected. No differential item functioning was detected for age. CONCLUSION: Except for a few modifications, the present analysis supports the combination of items, the cross-cultural validity of the CPQ with 14 items and the extension of the age range from 8 to 15 years. CLINICAL SIGNIFICANCE: The valid, reliable, shortened and age-extended version of the CPQ resulting from this study should be used in routine care and clinical research. Less items and a wider age range increase its usability. Symptoms items are needed to precisely differentiate between children with higher and lower quality of life.
Assuntos
Saúde Bucal , Qualidade de Vida , Adolescente , Austrália , Brasil , Criança , Europa (Continente) , Alemanha , Hong Kong , Humanos , Nova Zelândia , Reprodutibilidade dos Testes , Inquéritos e Questionários , Reino UnidoRESUMO
This study evaluated the influence of defined pressure application before light-curing on the tensile bond strength (TBS) of two adhesive systems to wet and perfused dentin. Bonding sites were analyzed by scanning electron microscopy (SEM) to assess morphological changes. Dentin discs from 120 human third molars were prepared in such a way to allow simulation of intrapulpal pressure. The specimens were randomly assigned to 6 groups (n=20) according to different experimental conditions. The adhesive systems (Scotchbond Multi-Purpose and Syntac) were applied either to wet or perfused dentin. In the latter, compression was applied before adhesive light-curing . TBS was recorded using an universal testing machine. Qualitative examination of the bonding sites was performed by SEM after dissolving the dentin with 50% nitric acid. Pressure application prior to light-curing resulted in a remarkable decrease of TBS for Syntac, while no significant change was observed for Scotchbond MP. SEM analysis showed no considerable lengthening of the resin tags after pressure application. These findings suggest that application of adhesive systems to dentin under pressure before light-curing had no positive effect on TBS.
Assuntos
Adesivos Dentinários/química , Dentina/ultraestrutura , Cura Luminosa de Adesivos Dentários , Acrilatos/química , Resinas Acrílicas/química , Resinas Compostas/química , Polpa Dentária/fisiologia , Permeabilidade da Dentina , Humanos , Luz , Teste de Materiais , Microscopia Eletrônica de Varredura , Pressão , Cimentos de Resina/química , Estresse Mecânico , Propriedades de Superfície , Resistência à Tração , Água/química , MolhabilidadeRESUMO
This study evaluated the influence of defined pressure application before light-curing on the tensile bond strength (TBS) of two adhesive systems to wet and perfused dentin. Bonding sites were analyzed by scanning electron microscopy (SEM) to assess morphological changes. Dentin discs from 120 human third molars were prepared in such a way to allow simulation of intrapulpal pressure. The specimens were randomly assigned to 6 groups (n=20) according to different experimental conditions. The adhesive systems (ScotchbondTM Multi-Purpose and Syntac®) were applied either to wet or perfused dentin. In the latter, compression was applied before adhesive light-curing . TBS was recorded using an universal testing machine. Qualitative examination of the bonding sites was performed by SEM after dissolving the dentin with 50 percent nitric acid. Pressure application prior to light-curing resulted in a remarkable decrease of TBS for Syntac®, while no significant change was observed for ScotchbondTM MP. SEM analysis showed no considerable lengthening of the resin tags after pressure application. These findings suggest that application of adhesive systems to dentin under pressure before light-curing had no positive effect on TBS.
Este estudo avaliou a influência da aplicação de uma pressão definida antes da polimerização sobre a resistência à tração de dois sistemas adesivos à dentina molhada e perfundida. Os sítios de adesão foram analisados em microscopia eletrônica de varredura (MEV) a fim de determinar a ocorrência de alterações morfológicas. Discos de dentina de 120 terceiros molares humanos foram preparados de tal forma a simular a pressão intrapulpar. Os espécimes foram alocados aleatoriamente em 6 grupos (n=20), de acordo com as diferentes condições experimentais propostas. Os sistemas adesivos (Syntac® e ScotchbondTM Multi-Purpose) foram aplicados sobre a dentina molhada ou perfundida. Nesta última, compressão (7 N) foi aplicada antes da polimerização do sistema adesivo. A resistência à tração foi registrada em máquina universal de ensaios. A análise qualitativa dos sítios de adesão foi realizada em MEV após dissolução da dentina em 50 por cento de ácido nítrico. A aplicação da pressão antes da polimerização do sistema adesivo resultou em diminuição significativa da resistência à tração do Syntac®, ao passo que para o ScotchbondTM MP nenhuma alteração significativa foi observada. A análise em MEV não mostrou aumento considerável do tamanho dos tags de resina após a aplicação da pressão. Esses achados sugerem que a aplicação de sistemas adesivos à dentina sob pressão previamente à polimerização não teve efeito positivo sobre a resistência à tração.