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Características das estruturas metálicas para próteses parciais removíveis esqueléticas na área metropolitana de Lisboa
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Introdução: A prótese parcial removível (PPR) esquelética é constituída por diversos componentes, que são selecionados consoante o tipo de desdentação. O objetivo desta investigação foi analisar os componentes utilizados na área metropolitana de Lisboa.
Materiais e Métodos: Realizou-se um estudo transversal, cuja população-alvo foram 3 laboratórios. Os dados foram obtidos através dum questionário, que recolheu informação sobre: as desdentações, os conectores maiores, uso de attachments, número de ganchos, características dos ganchos adjacentes às selas livres, utilização de apoios indiretos e utilização da técnica modelo alterado. Os questionários foram preenchidos pelos técnicos de prótese, através da observação das estruturas metálicas. Foi realizada estatística descritiva e analisada a correlação entre o conetor maior e a desdentação.
Resultados: Foram contabilizados 59 questionários válidos. As desdentações mais prevalentes, foram a classe II e III de Kennedy (40,7%) e a menos prevalente a Classe IV de Kennedy (3,4%). O conector maior maxilar mais frequente foi o palato em U (40,7%), e o mandibular a barra lingual (62,5%). Apenas um questionário referiu a utilização de attachments. Nas classes I foi mais frequente a utilização de 2 e 3 unidades gancho, nas classes II foram 3 unidades gancho. Nestas classes, os ganchos com aproximação oclusal foram os mais utilizados (87,9%), sendo o apoio mesial o mais frequente em estruturas metálicas com selas livres. A utilização de apoios indiretos foi rara, 60,6% das estruturas não apresentaram. Não se verificou a construção de modelos pela técnica do modelo fraturado. Nas classes III e IV, o número de unidades gancho mais utilizado foi 4, sendo os ganchos de Akers os mais prevalentes. A inferência estatística revelou que não se verificou correlação entre o tipo de desdentação de Kennedy e o conector maior utilizado.
Conclusões: Na maioria das situações encontramos estruturas metálicas com os componentes indicados segundos os princípios biomecânicos.
Introduction: Removable partial dentures (RPD) are planned with many components, which selection is influenced by the type of edentulism. The aim of this investigation was to analyze the components used in the metal frameworks of RPDs in the Lisbon Metropolitan Area. Materials and Methods: A cross-sectional study was carried out in 3 laboratories. The data were obtained through a questionnaire, which collected information on: edentulism, major connectors, use of attachments, number of clasps, characteristics of the clasps near distal extension bases, use of indirect retainers and use of the modified model technique. The questionnaires were answered by the prosthetic technicians, through observation of the metal structures. Descriptive statistics were performed and the correlation between major connector and edentulism was analyzed. Results: 59 valid questionnaires were counted. Kennedy's Class II and III were the most prevalent (both with 40.7%) and the least prevalent was Kennedy's Class IV (3.4%). The most frequent maxillary connector was the U-shaped palate (40.7%), and in the mandible was the lingual bar (62.5%). Only one questionnaire reported the use of attachments as direct retainers. In Class I it was more frequent the use of 2 and 3 clasps, and 3 clasps in Class II. In these classes, clasps with occlusal approximation were the most recurrent (87.9%), and mesial support was used most frequently in metal frameworks with distal extensions. The use of indirect retainers was rare, absent on 60.6% of the frameworks did not have. Altered cast technique was not performed in any structures. In classes III and IV, 4 clasps were the most frequent, and Akers were the most prevalent clasps. Conclusions: Most metal frameworks included the components indicated according to biomechanical principles.
Introduction: Removable partial dentures (RPD) are planned with many components, which selection is influenced by the type of edentulism. The aim of this investigation was to analyze the components used in the metal frameworks of RPDs in the Lisbon Metropolitan Area. Materials and Methods: A cross-sectional study was carried out in 3 laboratories. The data were obtained through a questionnaire, which collected information on: edentulism, major connectors, use of attachments, number of clasps, characteristics of the clasps near distal extension bases, use of indirect retainers and use of the modified model technique. The questionnaires were answered by the prosthetic technicians, through observation of the metal structures. Descriptive statistics were performed and the correlation between major connector and edentulism was analyzed. Results: 59 valid questionnaires were counted. Kennedy's Class II and III were the most prevalent (both with 40.7%) and the least prevalent was Kennedy's Class IV (3.4%). The most frequent maxillary connector was the U-shaped palate (40.7%), and in the mandible was the lingual bar (62.5%). Only one questionnaire reported the use of attachments as direct retainers. In Class I it was more frequent the use of 2 and 3 clasps, and 3 clasps in Class II. In these classes, clasps with occlusal approximation were the most recurrent (87.9%), and mesial support was used most frequently in metal frameworks with distal extensions. The use of indirect retainers was rare, absent on 60.6% of the frameworks did not have. Altered cast technique was not performed in any structures. In classes III and IV, 4 clasps were the most frequent, and Akers were the most prevalent clasps. Conclusions: Most metal frameworks included the components indicated according to biomechanical principles.
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