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http://hdl.handle.net/1843/45449| Tipo: | Artigo de Periódico |
| Título: | Dimensional precision of implant-supported frameworks fabricated by 3d printing |
| Autor(es): | Anna Gabriella Camacho Presotto Valentim Adelino Ricardo Barão Cláudia Lopes Brilhante Bhering Marcelo Ferraz Mesquita |
| Resumo: | Statement of problem. Selective laser melting (SLM) is a promising additive technology for clinical practice, but data on dimensional precision assessed by marginal fit combined with stress and strain investigations of implant-supported fixed partial dentures (FPDs) are lacking. Purpose. The purpose of this in vitro study was to verify whether the SLM additive manufacturing technology provides better dimensional precision for 3-unit FPD frameworks than subtractive manufacturing with soft metal block (SMB) milling and the standard casting technique. Material and methods. Thirty 3-unit implant-supported FPDs with Co-Cr frameworks were made by the casting, SMB milling, and SLM methods (n=10). The marginal fit between the framework and the implant abutment was evaluated with photoelastic (PH) and strain gauge (SG) models. Stress and strain in the implant-supported system were measured by quantitative PH and SG analyses after prosthetic screw tightening. Data were subjected to the Kruskal-Wallis test, Mann- Whitney U test, and Spearman correlation test (a=.05). Results. The framework manufacturing method affected the marginal fit (P<.001), stress, and strain values (P<.05). The SLM group showed the best mean ±standard deviation marginal fit (mm) (PH model: 8.4 ±3.2; SG model: 6.9 ±2.1) in comparison with SMB milling (PH model: 42.3 ±15.7; SG model: 41.3 ±15.3) and casting (PH model: 43.5 ±27.8; SG model: 41.3 ±24.6) (P<.05). SLM showed lower mean ±standard deviation stress and strain values (60.3 ±11.6 MPa; 91.4 ±11.1 mstrain) than casting (225.5 ±142.8 MPa; 226.95 ±55.4 mstrain) and SMB milling (218.6 ±101.7 MPa; 289.7 ±89.3 mstrain) (P<.05). A positive correlation was observed between fit and stress or strain for all groups (P<.05). Conclusions. Three-unit FPD frameworks made using the SLM technology showed better dimensional precision than those obtained with the casting or SMB milling methods |
| Assunto: | Denture partial fixed Dental Implants |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Instituição: | UFMG |
| Departamento: | FAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORA |
| Tipo de Acesso: | Acesso Restrito |
| Identificador DOI: | 10.1016/j.prosdent.2019.01.019 |
| URI: | http://hdl.handle.net/1843/45449 |
| Data do documento: | Jul-2019 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0022391319300988 |
| metadata.dc.relation.ispartof: | Journal of Prosthetic Dentistry |
| Aparece nas coleções: | Artigo de Periódico |
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