After exfoliation of the primary incisors and eruption of the permanent incisors, the dentist has the opportunity of observing closely the beginning of occlusal changes. In several cases, alterations, such as lower anterior crowding, can be prevented and treated with proper follow-up. In the mixed dentition, one of the mechanisms for maintaining space and favoring dental alignment is to preserve leeway space before permanent second molar irruption. Among the devices with this function, the Nance lingual arch helps maintaining the position of the permanent mandibular molars and incisors after a premature loss of the primary canines. This paper describes the applicability of Nance lingual arch for preserving leeway space, thus contributing for correction of lower anterior crowding.
ResumoO objetivo deste estudo retrospectivo implica em comparar a presença de velamento, o espessamento de mucosa e a presença de septo no seio maxilar em radiografias panorâmicas e tomografias computadorizadas de feixe cônico (TCFC). A amostra foi composta por 100 pacientes do arquivo, que apresentavam as radiografias panorâmicas e as TCFC antes do início do tratamento ortodôntico, sendo 57 mulheres e 43 homens, com média de idade de 19,08 anos. Foram incluídas nesta pesquisa apenas os exames que apresentavam boa qualidade e bom posicionamento do paciente. A avaliação do velamento, espessamento de mucosa e presença de septo no seio maxilar foi realizada por um único examinador calibrado, de forma independente, nas radiografias e nas TCFC. A concordância entre os exames foi avaliada por meio do teste Kappa. Os resultados demonstraram boa concordância entre as radiografias panorâmicas e TCFC (Kappa entre 0,62 a 0,72), com -90, -88 e 89% de convergência entre os métodos, para velamento do seio maxilar; espessamento de mucosa e presença de septo no seio maxilar, respectivamente. Pode-se concluir que foi encontrada concordância satisfatória na avaliação do velamento, espessamento de mucosa e presença de septo no seio maxilar entre as radiografias panorâmica e TCFC. Dessa forma, as características do seio maxilar foram identificadas, de maneira semelhante, na radiografia panorâmica e na TCFC. (Kappa between 0.62 and 0.72), convergence between the methods, for the presence of filled maxillary sinus, mucosal thickening and presence of septum in the maxillary sinus, respectively. It can be concluded that satisfactory agreement was found in the evaluation of the the presence of filled maxillary sinus, mucosal thickening and presence of septum in the maxillary sinus between the panoramic and CBCT radiographs. Thus, the characteristics of the maxillary sinus were similarly identified in panoramic radiography and CBCT. Palavras-chave:
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