Avaliação in vitro da precisão entre técnicas de moldagens convencional e digital no sistema all-on-four
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Data
2019-04-11
Autores
Tinajero Aroni, Mônica Estefanía
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo neste estudo foi avaliar in vitro a precisão entre técnicas de moldagem convencional e os diferentes scanners digitais em reabilitações protéticas sobre implantes. Um modelo anatômico metálico de maxila desdentada com quatro implantes, simulando o sistema All-on-four, foi escaneado com um scanner de contato (MDX-40, Roland) e utilizado como modelo mestre para posterior comparação com outros scanners odontológicos. Sobre os implantes do modelo mestre foram instalados scanbodies para permitir a digitalização da posição dos implantes. Dois scanners de bancada e um scanner intraoral foram utilizados para a digitalização do modelo mestre e posterior sobreposição das imagens com o objetivo de comparar o posicionamento em 3D dos análogos em relação à posição dos implantes no modelo mestre e avaliar a precisão dos scanners. Ainda, utilizando o modelo mestre foram realizadas 10 moldagens com a técnica convencional (moldeira aberta), que foram vazadas e os modelos obtidos foram digitalizados com o scanner de contato. As imagens obtidas em formato STL foram exportadas para o programa Bio-CAD para avaliação e comparação da precisão entre as técnicas de moldagem convencional e a moldagem digital. A análise da sobreposição das imagens foi guiada pela pirâmide presente no modelo mestre, o que permitiu avaliar a diferença na posição dos análogos em 3D nos eixos X, Y e Z. Os valores médios dos desvios (μm) da posição do modelo mestre em relação a posição das imagens dos diferentes scanners nos componentes em três eixos, x, y e z, foram submetidos ao teste paramétrico de análise de variância a um fator (ANOVA) complementado pelo teste de Tukey, com nível de significância de 5%. Os resultados mostraram que independente do método utilizado, o componente D teve os maiores desvios em todos os eixos em todos os sistemas utilizados (p<0.05). De forma geral quando comparados os scanners de bancada, o scanner da Amann Girbbach apresentou menores desvios para todos os eixos quando comparado ao scanner de Shining 3D. Ao se comparar o scanner intraoral com a técnica convencional, verificou-se desvios menores em todos os eixos quando comparados com a moldagem convencional (p<0.05). Em conclusão o scanner da Amann Girbbach teve os resultados mais precisos em relação ao outro scanner de bancada. O scanner intraoral mostrou-se melhor do que a técnica convencional.
This study aims to evaluate in vitro the accuracy between conventional impression techniques and different digital scanners in prosthetic implant rehabilitation. A metallic anatomical model of a edentulous maxilla with four implants, simulating the All-on-four system, was scanned by a contact scanner and used as a control group for later comparison with dental scanners. On the implants of the master model were installed scanbodies to allow the digitalization of the position of the implants. Two laboratory scanners and an intraoral scanner were used for the digitalization of the master model and later overlap of the images in order to compare the 3D position of the analogs in relation to the position of the master model and evaluate the accuracy of this scanners. Subsequently, from the master model, 10 casts were made using the conventional technique (pick-up technique). The models were created with plaster and the obtained models were scanned by the contact scanner. The images obtained in STL format were exported to the Bio-CAD program for evaluation and comparison of the precision between the conventional and impression technique. The analysis of the superimpose of the images was guided by the pyramid present in the master model, so it was possible to evaluate the difference in a 3D position of the analogues in the X, Y and Z axes. The mean values of the deviations (μm) in relation to the virtual position of the images obtained by the different scanners of the components on the three axes, x, y, and z, were submitted to the one-way ANOVA parametric test complemented by the Tukey test, with a significance level of 5%. The results showed that, regardless of the method used, the component D had the greatest deviations for all axes with all the tested systems (p <0.05). In general, when comparing the laboratory scanners, the scanner 1 showed lower deviations in all the axes (90μm) when compared to the scanner 2 (171μm). When comparing the scanner 3 with the conventional technique the scanner 3 showed slightly lower deviations in all the axes (139μm) when compared with the conventional impression techniques (174μm) (p<0.05). In conclusion the scanner 1 had the most accurate results compared to scanner 2. The scanner 3 proved to be slightly better than the conventional technique.
This study aims to evaluate in vitro the accuracy between conventional impression techniques and different digital scanners in prosthetic implant rehabilitation. A metallic anatomical model of a edentulous maxilla with four implants, simulating the All-on-four system, was scanned by a contact scanner and used as a control group for later comparison with dental scanners. On the implants of the master model were installed scanbodies to allow the digitalization of the position of the implants. Two laboratory scanners and an intraoral scanner were used for the digitalization of the master model and later overlap of the images in order to compare the 3D position of the analogs in relation to the position of the master model and evaluate the accuracy of this scanners. Subsequently, from the master model, 10 casts were made using the conventional technique (pick-up technique). The models were created with plaster and the obtained models were scanned by the contact scanner. The images obtained in STL format were exported to the Bio-CAD program for evaluation and comparison of the precision between the conventional and impression technique. The analysis of the superimpose of the images was guided by the pyramid present in the master model, so it was possible to evaluate the difference in a 3D position of the analogues in the X, Y and Z axes. The mean values of the deviations (μm) in relation to the virtual position of the images obtained by the different scanners of the components on the three axes, x, y, and z, were submitted to the one-way ANOVA parametric test complemented by the Tukey test, with a significance level of 5%. The results showed that, regardless of the method used, the component D had the greatest deviations for all axes with all the tested systems (p <0.05). In general, when comparing the laboratory scanners, the scanner 1 showed lower deviations in all the axes (90μm) when compared to the scanner 2 (171μm). When comparing the scanner 3 with the conventional technique the scanner 3 showed slightly lower deviations in all the axes (139μm) when compared with the conventional impression techniques (174μm) (p<0.05). In conclusion the scanner 1 had the most accurate results compared to scanner 2. The scanner 3 proved to be slightly better than the conventional technique.
Descrição
Palavras-chave
Impressão tridimensional, Implante dentário, Prótese dentária., Tridimensional impression, Dental implants, Dental prosthesis