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      Crossover Studies of Pediatric Dental Sedation are Inappropriate

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          Abstract

          Abstract Crossover studies continue to be published in spite of warnings about their inherent risks in relation to behavioral outcomes. This study took the opportunity of access to secondary data analysis in order to demonstrate the impact of a crossover design on the outcomes of randomized clinical trials aimed at the behavior of children during dental treatment. We evaluated the effect of the sequence of sedative administration, the sedative and the participant’s age on the behavior of children undergoing two sequential dental visits. Eighteen uncooperative healthy young children were equally randomly assigned to: (G1) 1.0 mg/kg oral midazolam (first session) and oral placebo (second session); (G2) oral placebo (first) and 1.0 mg/kg oral midazolam (second). One trained observer assessed children’s behavior. Data were analyzed by three-way mixed ANOVA. Both midazolam [mean(SD); 71.7%(16.5)] and placebo [48.6%(33.1)] produced more struggling behavior when they were administered in the first session compared to the second one (p=0.001). For the placebo, children aged 2-3 years exhibited more struggling behavior [G1 54.9%(36.2); G2 80.5%(8.3)] than those aged 4-5 years (p=0.04). Also, the reduction of percentage of struggling behavior was higher in G1 for older children (76.2%) and in G2 for younger children (32.9%). There were significant interactions between drug and sequence of administration, and between drug and age. The results of our study confirm the conventional wisdom that crossover study design is inappropriate to evaluate children’s behavior/anxiety related-dental treatment under sedation and the results of crossover studies of dental sedation should be treated with extreme caution.

          Translated abstract

          Resumo Pouco se sabe sobre o impacto de um delineamento cruzado nos desfechos de ensaios clínicos randomizados voltados ao comportamento de crianças durante tratamento odontológico. Este estudo objetivou avaliar o efeito da sequência de administração do sedativo, da droga em si e da idade dos participantes no comportamento de crianças que receberam duas consultas odontológicas consecutivas. Dezoito crianças saudáveis não colaboradoras, 2-5 anos de idade, foram randomizadas em dois grupos: G1 - 1,0 mg/kg midazolam oral (primeira sessão) e placebo oral (segunda sessão); G2 - placebo (primeira) e 1,0 mg/kg midazolam oral (segunda). Um observador treinado avaliou o comportamento infantil. Os dados foram analisados por ANOVA de três fatores (alfa=0,05). Midazolam [média(DP); 71,7%(16,5)] e placebo [48,6%(33,1)] resultaram em mais comportamento não cooperativo quando administrados na primeira sessão comparado com a segunda (p=0,001). Com o uso do placebo, crianças de 2-3 anos de idade exibiram mais comportamento não cooperativo [G1 54,9%(36,2); G2 80,5%(8,3)] que as de 4-5 anos de idade (p=0,04). Além disso, a porcentagem de redução do comportamento não cooperativo foi maior em crianças mais velhas em G1 (76,2%) e em crianças mais novas em G2 (32,9%). Considerando a avaliação do comportamento infantil sob sedação, a primeira sessão odontológica influenciou a segunda visita. Os resultados deste estudo confirmam a especulação de que o delineamento cruzado é inadequado para avaliar o comportamento odontológico relacionado à ansiedade/comportamento infantil; os resultados dos ensaios cruzados de sedação odontológica devem ser tratados com extrema cautela.

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          Dental fear/anxiety and dental behaviour management problems in children and adolescents: a review of prevalence and concomitant psychological factors.

          The objectives of this article were to examine the literature published from 1982 to 2006 and to evaluate prevalence of dental fear and anxiety (DFA) and dental behaviour management problems (DBMP) in children and adolescents, and their relationships to age, sex, general anxiety, temperament, and general behavioural problems. A broad search of the PubMed database was performed using three combinations of search terms. A large proportion of the identified articles could not be used for the review owing to inadequate endpoints, measures or poor study design. Thirty-two papers of acceptable quality were identified and reviewed. The prevalence of both DFA and DBMP were estimated to 9%, with a decrease in prevalence with age. DFA/DBMP were more frequent in girls. DFA/DBMP were related to general fear and both internalizing and externalizing behavioural problems, although these relationships were not clear-cut. Temperament was related to both DFA and DBMP but with different temperamental characteristics, while general behavioural problems mainly correlated with DBMP. DFA/DBMP are common, and several psychological factors are associated with the development of these problems. In order to better understand these relationships, a number of issues concerning design of research and measurement of DFA/DBMP have to be dealt with.
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            Strategies for salivary cortisol collection and analysis in research with children.

            Salivary cortisol has emerged in pediatric research as an easy-to-collect, relatively inexpensive, biologic marker of stress. Cortisol is highly variable and is responsive to a wide range of factors that should be considered when incorporating this measure into research with children. Strategies for sample collection include: (1) standardizing the time for sample collection, including baseline samples; (2) using consistent collection materials and methods; (3) controlling for certain drinks, foods, medications, and diagnoses; and (4) establishing procedures and protocols. Other strategies for laboratory analyses include: (1) selecting the appropriate assay and laboratory; (2) identifying units of measure and norms; and (3) establishing quality controls. These strategies control extraneous variables and produce reliable and valid salivary cortisol results.
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              Cochrane handbook for systematic reviews of interventions version 5.1.0 [updated March 2011]

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                bdj
                Brazilian Dental Journal
                Braz. Dent. J.
                Fundação Odontológica de Ribeirão Preto (Ribeirão Preto, SP, Brazil )
                0103-6440
                1806-4760
                July 2019
                : 30
                : 4
                : 404-409
                Affiliations
                [3] Goiânia Goiás orgnameUniversidade Federal de Goiás orgdiv1Medical School Brazil
                [1] Alfenas Minas Gerais orgnameUniversidade José do Rosário Vellano orgdiv1Faculdade de Odontologia Brazil
                [2] Goiânia Goiás orgnameUniversidade Federal de Goiás orgdiv1Faculdade de Odontologia Brazil
                Article
                S0103-64402019000400404
                10.1590/0103-6440201902852
                d2ca9165-5cf0-4f6e-9fa7-e830fe73274b

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 03 June 2018
                : 04 April 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 23, Pages: 6
                Product

                SciELO Brazil

                Categories
                Articles

                behavior control,randomized clinical trial,dental care for children,dental anxiety,moderate sedation,midazolam

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