A Comparison of the Flexural and Impact Strengths and Flexural Modulus of CAD/CAM and Conventional Heat-Cured Polymethyl Methacrylate (PMMA).
CAD/CAM
flexural strength
impact strength
Journal
Journal of prosthodontics : official journal of the American College of Prosthodontists
ISSN: 1532-849X
Titre abrégé: J Prosthodont
Pays: United States
ID NLM: 9301275
Informations de publication
Date de publication:
Apr 2020
Apr 2020
Historique:
accepted:
20
04
2018
pubmed:
14
6
2018
medline:
21
4
2020
entrez:
14
6
2018
Statut:
ppublish
Résumé
The introduction of computer-aided design/computer-aided manufacturing (CAD/CAM) technology to the field of removable prosthodontics has recently made it possible to fabricate complete dentures of prepolymerized polymethyl methacrylate (PMMA) blocks, which are claimed to be of better mechanical properties; however, no published reports that have evaluated mechanical properties of CAD/CAM PMMA. The purpose of this study was to compare flexural strength, impact strength, and flexural modulus of two brands of CAD/CAM PMMA and a conventional heat-cured PMMA. 45 rectangular specimens (65 mm × 10 mm × 3 mm) were fabricated (15 CAD/CAM AvaDent PMMA specimens from AvaDent, 15 CAD/CAM Tizian PMMA specimens from Shütz Dental, 15 conventional Meliodent PMMA specimens from Heraeus Kulzer) and stored in distilled water at (37 ± 1°C) for 7 days. Specimens (N = 15) in each group were subjected to the three-point bending test and impact strength test, employing the Charpy configuration on unnotched specimens. The morphology of the fractured specimens was studied under a scanning electron microscope (SEM). Statistical analysis was performed using one-way ANOVA and Tukey pairwise multiple comparisons with 95% confidence interval. The Schütz Dental specimens showed the highest mean flexural strength (130.67 MPa) and impact strength (29.56 kg/m As CAD/CAM PMMA specimens exhibited improved flexural strength, flexural modulus, and impact strength in comparison to the conventional heat-cured groups, CAD/CAM dentures are expected to be more durable. Different brands of CAD/CAM PMMA may have inherent variations in mechanical properties.
Substances chimiques
Dental Materials
0
Polymethyl Methacrylate
9011-14-7
Types de publication
Journal Article
Langues
eng
Pagination
341-349Subventions
Organisme : Department of Scientific Research/ Jordan University of Science and Technology
ID : 240/2016
Informations de copyright
© 2018 by the American College of Prosthodontists.
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