Marginal fit and photoelastic stress analysis of cad-cam and overcast 3-unit implant-supported frameworks

Página do item simplificado
dc.creatorAnna Gabriella Camacho Presotto
dc.creatorCláudia Lopes Brilhante Bhering
dc.creatorMarcelo Ferraz Mesquita
dc.creatorValentim Adelino Ricardo Barão
dc.date.accessioned2022-09-24T16:42:33Z
dc.date.accessioned2025-09-08T23:42:46Z
dc.date.available2022-09-24T16:42:33Z
dc.date.issued2016-09-22
dc.format.mimetypepdf
dc.identifier.doi10.1016/j.prosdent.2016.06.011
dc.identifier.issn00223913
dc.identifier.urihttps://hdl.handle.net/1843/45437
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofThe journal of Prosthetic Dentistry
dc.rightsAcesso Restrito
dc.subjectDental implants
dc.subjectDental prosthesis
dc.titleMarginal fit and photoelastic stress analysis of cad-cam and overcast 3-unit implant-supported frameworks
dc.typeArtigo de periódico
local.citation.epage379
local.citation.issue3
local.citation.spage373
local.citation.volume117
local.description.resumoStatement of problem: Several studies have shown the superiority of computer-assisted design and computer-assisted manufacturing (CAD-CAM) technology compared with conventional casting. However, an advanced technology exists for casting procedures (the overcasting technique), which may serve as an acceptable and affordable alternative to CAD-CAM technology for fabricating 3-unit implant-supported fixed dental prostheses (FDPs). Purpose: The purpose of this in vitro study was to evaluate, using quantitative photoelastic analysis, the effect of the prosthetic framework fabrication method (CAD-CAM and overcasting) on the marginal fit and stress transmitted to implants. The correlation between marginal fit and stress was also investigated. Material and methods: Three-unit implant-supported FDP frameworks were made using the CAD-CAM (n=10) and overcasting (n=10) methods. The frameworks were waxed to simulate a mandibular first premolar (PM region) to first molar (M region) FDP using overcast mini-abutment cylinders. The wax patterns were overcast (overcast experimental group) or scanned to obtain the frameworks (CAD-CAM control group). All frameworks were fabricated from cobalt-chromium (CoCr) alloy. The marginal fit was analyzed according to the single-screw test protocol, obtaining an average value for each region (M and PM) and each framework. The frameworks were tightened for the photoelastic model with standardized 10-Ncm torque. Stress was measured by quantitative photoelastic analysis. The results were submitted to the Student t test, 2-way ANOVA, and Pearson correlation test (α=.05). Results: The framework fabrication method (FM) and evaluation site (ES; M and PM regions) did not affect the marginal fit values (P=.559 for FM and P=.065 for ES) and stress (P=.685 for FM and P=.468 for ES) in the implant-supported system. Positive correlations between marginal fit and stress were observed (CAD-CAM: r=0.922; P<.001; overcast: r=0.908; P<.001). Conclusions: CAD-CAM and overcasting methods present similar marginal fit and stress values for 3-unit FDP frameworks. The decreased marginal fit of frameworks induces greater stress in the implant-supported system.
local.publisher.countryBrasil
local.publisher.departmentFAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORA
local.publisher.initialsUFMG
local.url.externahttps://www.thejpd.org/article/S0022-3913(16)30279-7/fulltext#relatedArticles

Arquivos

Licença do pacote

Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
License.txt
Tamanho:
1.99 KB
Formato:
Plain Text
Descrição:
Baixar

Coleções

Artigo de Periódico

Logo UFMG