Avaliação do assentamento de coroas totais à base de dissilicato de lítio produzidas por três diferentes fluxos de trabalho: convencional, digital ou parcialmente digital

• Autor(a) principal: Rodrigues, Eduardo Roberty Coutinho
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14043
• topic: CAD/CAM; Ceramic; Fit; Hot Pressed; Replica Technique; Single crowns; Assentamento; CAD/CAM; Cerâmica; Coroas unitárias; Injetada; Técnica da réplica; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The aim of this study was to evaluate the marginal and internal fit of porcelain indirect restorations produced by three distinct workflows in four pre-determined interface areas. A titanium master model - simulating a full crown molar preparation - was built to this study. 36 lithium dissilicate full crowns coverage were produced. The restorations were divided in 3 groups, according to the workflow: Totally Conventional (TC), where a polieter impression of the master model was poured with type IV gypsum, and 12 full crown coverages (IPS e.max PRESS ) were produced in the dental technician; Totally Digital (TD), where the master model was scanned with the Bluecam and 12 full crown coverages (IPS e.max CAD ) were milled in the CEREC 3 ; Partially Digital (PD), where a polieter impression of the master model was poured with type IV gypsum, with the Bluecam scanning the working model and the 12 full crown coverages (IPS e.max CAD ) being milled by the CEREC 3 . The replica technique, where the light body silicone simulate the cement, was used to evaluate the fit of the crowns. Two cross sectioned replicas per crown were obtained, generating images of the bucco-palatal and mesio-distal interfaces under 50x magnification. Four interface areas were choosen to the evaluation: Marginal Opening (AM); Chamfer (CH), Axial Wall (PA); and Occlusal Wall (PO). The hole interface area of each image was evaluated, generating approximately 6.000 points to be rated per interface. Results were statistical analyzed with one-way-Anova and Scheafer s post hoc with a 5% level of significance. All the 3 tested groups showed clinically acceptable mean values for marginal and internal fit. For the areas AM, CH and PO, similar results were found between the 3 groups. For the PA area, TC group showed significantely higher values than PD and TD groups (p = 0,001). The different workflows, conventional or digitals, used in this study were proven capable to present elegible marginal and internal fit, based on the accepted current values for porcelain full coverage crowns.