Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases

Background: Repeated fracture of the denture base is a common problem in prosthodontics, and it represents a nuisance and a time sink for the clinician. Therefore, the possibility of increasing repair strength using new reinforcement materials is of great interest to prosthodontists. Aim of the stud...

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Bibliographic Details
Published in:International journal of nanomedicine 2016-01, Vol.11, p.5633-5643
Main Authors: Gad, Mohammed M, Rahoma, Ahmed, Al-Thobity, Ahmad M, ArRejaie, Aws S
Format: Article
Language:English
Subjects:
Biocompatibility
Bond strength
Dentistry
Denture repair
Dentures
Emulsion polymerization
Flexural strength
Impact strength
Impact tests
Mechanical properties
Metal oxides
Nano-ZrO2
Nanoparticles
Original Research
PMMA
Polymers
Polymethyl methacrylate
Prostheses
Resins
Zirconium oxides
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Summary:Background: Repeated fracture of the denture base is a common problem in prosthodontics, and it represents a nuisance and a time sink for the clinician. Therefore, the possibility of increasing repair strength using new reinforcement materials is of great interest to prosthodontists. Aim of the study: This study aimed to evaluate the effects of incorporation of zirconia nanoparticles (nano-ZrO2) on the flexural strength and impact strength of repaired polymethyl methacrylate (PMMA) denture bases. Materials and methods: One hundred eighty specimens of heat-polymerized acrylic resin were fabricated (90 for each test) and divided into three main groups: one control group (intact specimens) and two groups divided according to surface design (45° bevels and butt joints), in which specimens were prepared in pairs to create 2.5 mm gaps. Nano-ZrO2 was added to repair resin in 2.5 wt%, 5 wt%, and 7.5 wt% concentrations of acrylic powder. A three-point bending test was used to measure flexural strength, and a Charpy-type test was used to measure impact strength. Scanning electron microscopy was used to analyze the fracture surfaces and nano-ZrO2 distribution. The results were analyzed with a paired sample t-test and an unpaired t-test, with a P-value of ≤0.05 being significant. Results: Incorporation of nano-ZrO2 into the repair resin significantly increased flexural strength (P
ISSN:1176-9114
1178-2013
1178-2013
DOI:10.2147/IJN.S120054