scholarly journals Assessing Fracture Toughness and Impact Strength of PMMA Reinforced with Nano-Particles and Fibre as Advanced Denture Base Materials

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4127
Author(s):  
Abdulaziz Alhotan ◽  
Julian Yates ◽  
Saleh Zidan ◽  
Julfikar Haider ◽  
Nikolaos Silikas
Keyword(s):  
Fracture Toughness ◽  
Impact Strength ◽  
Tio2 Nanoparticles ◽  
Glass Fibre ◽  
Nano Particles ◽  
Control Group ◽  
Fracture Toughness Test ◽  
Denture Base ◽  
Glass Fibres ◽  
Base Materials

Statement of Problem: Polymethyl methacrylate (PMMA) denture resins commonly fracture as a result of the denture being dropped or when in use due to heavy occlusal forces. Purpose: To investigate the effects of E-glass fibre, ZrO2 and TiO2 nanoparticles at different concentrations on the fracture toughness and impact strength of PMMA denture base. Materials and Methods: To evaluate fracture toughness (dimensions: 40 × 8 × 4 mm3; n = 10/group) and impact strength (dimensions: 80 × 10 × 4 mm3; n = 12/group), 286 rectangular tested specimens were prepared and divided into four groups. Group C consisted of the PMMA specimens without any filler (control group), while the specimens in the remaining three groups varied according to the concentration of three filler materials by weight of PMMA resin: 1.5%, 3%, 5%, and 7%. Three-point bending and Charpy impact tests were conducted to measure the fracture toughness and impact strength respectively. Scanning Electron Microscope (SEM) was utilised to examine the fractured surfaces of the specimens after the fracture toughness test. One-way analysis of variance (ANOVA) followed by Tukey post-hoc tests were employed to analyse the results at a p ≤ 0.05 significance level. Results: Fracture toughness of groups with 1.5 and 3 wt.% ZrO2, 1.5 wt.% TiO2, and all E-glass fibre concentrations were significantly higher (p < 0.05) than the control group. The samples reinforced with 3 wt.% ZrO2 exhibited the highest fracture toughness. Those reinforced with a 3 wt.%, 5 wt.%, and 7 wt.% of E-glass fibres had a significantly (p < 0.05) higher impact strength than the specimens in the control group. The heat-cured PMMA modified with either ZrO2 or TiO2 nanoparticles did not exhibit a statistically significant difference in impact strength (p > 0.05) in comparison to the control group. Conclusions: 1.5 wt.%, 3 wt.% of ZrO2; 1.5 wt.% ratios of TiO2; and 1.5 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% of E-glass fibre can effectively enhance the fracture toughness of PMMA. The inclusion of E-glass fibres does significantly improve impact strength, while ZrO2 or TiO2 nanoparticles did not.

Denture base materials reinforced with glass fibres

1987 ◽  
Vol 22 (5) ◽  
pp. 1875-1878 ◽  
Author(s):  
J. Nitanda ◽  
H. Matsui ◽  
A. Matsui ◽  
Y. Kasahara ◽  
K. Wakasa ◽  
...  
Keyword(s):  
Denture Base ◽  
Glass Fibres ◽  
Base Materials

Evaluation of Tissue Reaction to Some Denture-base Materials: An Animal Study

2008 ◽  
Vol 9 (4) ◽  
pp. 67-74 ◽  
Author(s):  
Behnaz Ebadian ◽  
Mohammad Razavi ◽  
Solmaz Soleimanpour ◽  
Ramin Mosharraf
Keyword(s):  
Animal Study ◽  
Weight Ratio ◽  
Acrylic Resin ◽  
Tissue Reaction ◽  
Control Group ◽  
Denture Base ◽  
Base Materials ◽  
Heat Cure ◽  
Two Samples ◽  
Significant Difference

Abstract Aim Controversy continues regarding the biocompatibility of denture base materials. One method to evaluate the biocompatibility of materials is in an animal study. Using dogs as subjects, the purpose of this study was to evaluate the vestibular tissue reaction to cobalt chromium (Co-Cr), heat cure acrylic resin, and acrylic resin mixed with aluminum oxide (Al2O3) compared with a control group using the histopathologic method. Methods and Materials Twelve disk shape samples (2 mm × 8 mm) in four groups of Co-Cr, acrylic resin, acrylic resin mixed with a 20% weight ratio of Al2O3, and a control group (Teflon) were fabricated. In one stage surgery two samples of each material (8 samples) was implanted in the buccal vestibule of each dog (n=6), subcutaneously. At 45 and 90-day intervals, half of the samples were excised along with peripheral tissue to assess the presence of inflammation by grading on a scale from 0 to 3 and the presence of a fibrotic capsule using histological observations. Data were analyzed using the Kruskal-Wallis, Mann-Whitney, and Tau b Kendal tests. Results Tissue reaction between Co-Cr and the control group was significant (P=0.02), but it was not significant between other groups. There was no significant difference between the 45 and 90-day postinsertion samples. The formation of fibrotic capsule groups was significant (P=0.01). It was significant between the Co-Cr and acrylic resin groups (P=0.01) and the acrylic resin and control groups (P=0.01). Conclusion The Co-Cr group was more toxic than the other groups. The inflammation increased during time. The inflammation in two acrylic groups was greater than the control and less than the Co-Cr group. The formation of fibrotic capsule, except in the acrylic resin with Al2O3 group, increased over time. Clinical Significance Co-Cr alloys are toxic and can produce damage to living tissue. Heat cure acrylic resin materials have less toxicity, and their use is safer than Co-Cr alloys. Citation Ebadian B, Razavi M, Soleimanpour S, Mosharraf R. Evaluation of Tissue Reaction to Some Denture-base Materials: An Animal Study. J Contemp Dent Pract 2008 May; (9)4:067-074.

scholarly journals The effect of polyamide microparticles addition on some mechanical prop-erties of light-cured acrylic resin

2019 ◽  
Vol 10 (2) ◽  
pp. 1464-1469
Author(s):  
Adnan R. Al Assal ◽  
Abdalbaset A Fatalla ◽  
Mohammed Moudhaffar ◽  
Ghasak H Jani
Keyword(s):  
Tensile Strength ◽  
Impact Strength ◽  
Base Material ◽  
Acrylic Resin ◽  
Strength Test ◽  
Control Group ◽  
Denture Base ◽  
Mean Values ◽  
Transverse Strength ◽  
Transverse Tensile

The general upgrading of polymer denture base material and research continuously looking for ideal restorative dental material with better properties, adequate esthetic properties, less expensive and easier to handle material to develop photo polymerization dental materials. This study was conducted to evaluate the effect of addition polyamide on mechanical microparticle properties light cure denture base material. One hindered sixty specimens from light-cured acrylic resin (Aurora). The divided mainly into four groups according to test used (Transverse strength test, impact strength test, hardness test and tensile strength test) with 40 specimens for each group. The results show an increase in Transverse strength, impact strength, hardness and tensile strength in all experimental group when compared to control group the highest mean values for all tests included in the study appeared in group B 1% polyamide. The addition of polyamide microparticle improves transverse, tensile, impact strength and hardness properties of denture base material.

Reinforcement of Denture Base Resin

2006 ◽  
Vol 49 ◽  
pp. 124-129 ◽  
Author(s):  
T. Nejatian ◽  
A. Johnson ◽  
R. Van Noort
Keyword(s):  
Fracture Toughness ◽  
Mechanical Tests ◽  
Inorganic Filler ◽  
Denture Base ◽  
Base Materials ◽  
Heat Cure ◽  
Base Resin ◽  
Filler Particles ◽  
Packing Method ◽  
Denture Base Resin

The fracture resistance of polymethyl methacrylate (PMMA) the most popular denture base materials, is not satisfactory. The aim of this study is to improve the mechanical properties of PMMA by adding filler particles. Different inorganic filler particles including micronised glass flakes, acryl silane micronised, glass flakes 350nm, TiO2 and ZrO2 with different ratios by weight were incorporated into heat-cure plain PMMA and processed with optimal condition [2.5:1 Powder/ monomer ratio, conventional packing method and water bath curing for 2 hours at 95°C] to produce 12mm diameter and 2mm thick discs. Plain PMMA without additives was prepared as a test control. Three types of mechanical tests, biaxial flexure, microindentation fracture toughness and Vickers hardness were carried out on the samples. It was found that incorporating the particles did not improve the biaxial flexural strength of the resin. However, TiO2, ZrO2 and micronised glass flakes increased the fracture toughness of the resin. The hardness of PMMA was improved by the incorporation of all the particles.

Denture base materials reinforced with glass fibres

1987 ◽  
Vol 22 (5) ◽  
pp. 1879-1881 ◽  
Author(s):  
J. Nitanda ◽  
H. Matsui ◽  
A. Matsui ◽  
Y. Kasahara ◽  
K. Wakasa ◽  
...  
Keyword(s):  
Denture Base ◽  
Glass Fibres ◽  
Base Materials
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