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OBJECTIVES: To evaluate, in an in vitro study, the quantity of artefacts generated by two different restorative materials, and to determine the diagnostic accuracy of cone beam CT (CBCT) scans and periapical radiographs in identifying gaps in prosthetic crowns. METHODS: A total of 30 teeth restored with metal-ceramic (n = 15) and all-ceramic (n = 15) crowns, properly adapted and with 0.30- and 0.50 mm gaps, underwent CBCT exams (with voxel sizes of 0.25 and 0.30 mm) and periapical radiographs. The artefacts generated by two different crowns were quantified and compared by the Mann-Whitney test. In addition, five examiners evaluated the presence or absence of gaps in periapical radiographs and CBCT images. The accuracy of tests was determined by the area under the receiver operatring characteristic curve and these values were compared by using the Kruskal-Wallis test. RESULTS: There was no significant difference in artefact values between the different restorative materials and the different resolutions of CBCT images. Regarding the accuracy of the tests evaluated, periapical radiography and CBCT with voxel size 0.25 mm showed the best performance for smaller gaps (0.30 mm). For larger gaps (0.50 mm), all exams tested showed the same performance. CONCLUSIONS: Periapical radiography was still the most cost-beneficial method for the diagnosis of maladaptation in dental restorations. CBCT exams did not improve accuracy in detecting gaps in prosthetic crowns.

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Introdução: As clínicas de radiologia são prestadoras de serviços que realizam exames por imagem odontológicos e seus proprietários devem se preocupar com a qualidade dos serviços prestados. Objetivo: Avaliar, por meio da percepção do empresário, a qualidade no atendimento prestado aos clientes das clínicas de radiologia odontológica da cidade de Juiz de Fora (Minas Gerais, Brasil). Material e Métodos: Foi aplicado um questionário estruturado, desenvolvido para avaliar a autopercepção do empresário quanto à qualidade no atendimento. Esse instrumento possuia 24 questões, incluindo os seguintes tópicos: dados gerais, infraestrutura, recursos humanos, biossegurança e radioproteção, logística, estratégia de marketing e avaliação dos clientes. Resultados: Cerca de 90% das clínicas aceitaram responder o questionário. Pode-se observar que o tempo de mercado das clínicas é bastante variável (um a 27 anos) e, em relação à formação dos seus gestores, apenas dois (25%) eram administradores de empresa. Quando questionados sobre se seus atendentes receberam algum tipo de capacitação, seis (75%) clínicas responderam que sim, mas que se tratou apenas de treinamento interno. Seis (75%) clínicas afirmaram que os pacientes aguardavam no máximo 10 minutos para serem atendidos e que cumpriam o prazo de entrega dos exames e laudos. Em relação ao marketing, o contato telefônico, a internet e as redes sociais foram as estratégias mais frequentes das clínicas participantes. Conclusão: Pode-se concluir que as clínicas de radiologia são geridas, na maioria das vezes, por profissionais que não possuem formação em administração, mas que se preocupam em garantir um atendimento de qualidade.

Introduction: Radiology clinics are providers of dental imaging services and their owners should be concerned about the quality of the services provided. Objective: To evaluate, through the perception of the businessman, the quality of service provided to the clients of the dental radiology clinics of the city of Juiz de Fora (Minas Gerais, Brazil). Material and Methods: A structured questionnaire was developed to evaluate the self-perception of the businessman regarding the quality of service. This instrument had 24 issues, including the following topics: general data, infrastructure, human resources, biosafety and radioprotection, logistics, marketing strategy and customer assessment. Results: About 90% of the clinics accepted to answer the questionnaire. It can be observed that the market time of the clinics is quite variable (one to 27 years) and, in relation to the training of their managers, only two (25%) were administrators. When questioned about whether their attendants received some type of training, six (75%) clinics answered yes, but it was only internal training. Six (75%) clinics stated that the patients waited for a maximum of 10 minutes to be attended and that they had complied with the deadline for the examinations and awards. In relation to marketing, telephone contact, internet and social networks were the most frequent strategies of participating clinics. Conclusion: It can be concluded that radiology clinics are generally managed by professionals with no graduation in administrative field, but concerned about service quality.

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