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Authors
Abstract(s)
INTRODUÇÃO: O polimetilmetacrilato é um material comummente
utilizado como material para confeção de bases protéticas. Desvantagens
inerentes conduziram ao surgimento de vários tipos de resina para ultrapassar
estes problemas, como o sistema CAD/CAM. De entre várias propriedades dos
materiais, a rugosidade de superfície tem elevada relevância clínica, pois, uma
base protética com maior rugosidade irá promover o desenvolvimento de
patologias inflamatórias, como a Candidíase Oral e a Estomatite Protética. O
principal objetivo é determinar o efeito do mesmo protocolo de polimento de
superfície em diferentes resinas acrílicas utilizadas para a confeção de bases
protéticas obtidas por diferentes técnicas de processamento.
METODOLOGIA: Foram confecionados 30 provetes de resina acrílica
obtidos por diferentes métodos de processamento. Os provetes foram
submetidos ao mesmo protocolo de polimento com recurso a duas técnicas
distintas, manual e mecanizada. A leitura da rugosidade de superfície foi
realizada com recurso a um perfilómetro de contacto. Os dados obtidos foram
alvo de análise estatística através do programa SPSS com um nível de
significância definido a 0.05.
RESULTADOS: Todas as resinas sujeitas a polimento manual
apresentaram um valor médio de rugosidade de superfície significativamente
inferior às resinas submetidas a um polimento mecanizado, excetuando as
resinas termoplásticas (p=0,713). Para as resinas sujeitas a polimento manual,
registaram-se diferenças significativas entre os pares de resina fresagem e
impressão 3D (p=0,012) e termopolimerizável e fresagem (p=0,024). No caso
das resinas sujeitas a polimento mecanizado, verificaram-se apenas diferenças
significativas face aos valores de rugosidade entre as resinas autopolimerizável
e de impressão 3D (p=0,004) e entre as resinas autopolimerizável e
termopolimerizável (p=0,004).
CONCLUSÃO: Quando aplicado o mesmo protocolo de polimento, a
diferença de valores de rugosidade média entre resinas acrílicas para confeção
de bases protéticas pode ser atribuída às características inerentes da resina e
às respetivas técnicas de processamento.
INTRODUCTION: PMMA has been commonly used as a material for denture bases. Inherent disadvantages led to the emergence of various resins to overcome some problems as the CAD/CAM technology. Among the properties of materials used in making dental prostheses, surface properties such as roughness have high clinical relevance, since a prosthetic base with greater roughness will enhance the development of pathologies such as Oral Candidiasis or Prosthetic Stomatitis, which are the most prevalent inflammatory diseases in patients with removable dentures. The main objective of this laboratory investigation study is to determine the effect of the same polishing protocol on the surface roughness of different prosthetic base resins obtained by different processing techniques. METHODOLOGY: Thirty acrylic resin specimens obtained by different processing methods were manufactured. The specimens were submitted to the same polishing protocol using two different techniques, manual and mechanized. The surface roughness was measured by a contact profilometer. Data were submitted to statistical analysis using the SPSS program with a significance level set to 0.05. RESULTS: All resins subjected to manual polishing had an average roughness value significantly lower than resins submitted to mechanized polishing, except for thermoplastic resins (p=0.713). For resins subjected to manual polishing, there were significant differences between the resin pairs milling and 3D printing (p=0.012) and thermopolymerizable and milling (p=0.24). In the case of resins subjected to mechanized polishing, there were only significant differences regarding the roughness values between the self - cured and 3D printed resins (p=0.004) and self-cured and thermopolymerizable resins (p=0.004). CONCLUSION: When the same polishing protocol is applied, the difference in the surface roughness value between acrylic resins for making prosthetic bases can be attributed to the inherent characteristics of the resin and the respective processing techniques
INTRODUCTION: PMMA has been commonly used as a material for denture bases. Inherent disadvantages led to the emergence of various resins to overcome some problems as the CAD/CAM technology. Among the properties of materials used in making dental prostheses, surface properties such as roughness have high clinical relevance, since a prosthetic base with greater roughness will enhance the development of pathologies such as Oral Candidiasis or Prosthetic Stomatitis, which are the most prevalent inflammatory diseases in patients with removable dentures. The main objective of this laboratory investigation study is to determine the effect of the same polishing protocol on the surface roughness of different prosthetic base resins obtained by different processing techniques. METHODOLOGY: Thirty acrylic resin specimens obtained by different processing methods were manufactured. The specimens were submitted to the same polishing protocol using two different techniques, manual and mechanized. The surface roughness was measured by a contact profilometer. Data were submitted to statistical analysis using the SPSS program with a significance level set to 0.05. RESULTS: All resins subjected to manual polishing had an average roughness value significantly lower than resins submitted to mechanized polishing, except for thermoplastic resins (p=0.713). For resins subjected to manual polishing, there were significant differences between the resin pairs milling and 3D printing (p=0.012) and thermopolymerizable and milling (p=0.24). In the case of resins subjected to mechanized polishing, there were only significant differences regarding the roughness values between the self - cured and 3D printed resins (p=0.004) and self-cured and thermopolymerizable resins (p=0.004). CONCLUSION: When the same polishing protocol is applied, the difference in the surface roughness value between acrylic resins for making prosthetic bases can be attributed to the inherent characteristics of the resin and the respective processing techniques
Description
Keywords
Prótese removível PMMA CAD/CAM Rugosidade de superfície Perfilómetro de contacto Removal prosthesis Surface roughness Contact profilometer