Surface Roughness, Hardness, Color Stability, Water Sorption and Water Solubility of PMMA Denture BaseMaterial Reinforced with SynthesizedInorganic, Organic, and Hybrid Nanofibers | ||||
| Egyptian Dental Journal | ||||
| Article 8, Volume 64, Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), October 2018, Page 3593-3608 PDF (1.09 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2018.79224 | ||||
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| Authors | ||||
| Usama M Abdel-Karim1; Samy M El-Safty2; El-Refaie Kenawy3 | ||||
| 1Assistant Professor, Department of Dental Biomaterials, Director of Research Lab, Faculty of Dentistry, Tanta University, Tanta, Egypt. | ||||
| 2Lecturer, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Egypt | ||||
| 3Professor, Department of Chemistry, Director of Technology Transfer office, Faculty of Science, Tanta University, Tanta, Egypt. | ||||
| Abstract | ||||
| Objective: The objective of the study was to assess surface roughness, microhardness, color stability, water sorption and water solubility of polymethyl methacrylate (PMMA) denture base resin reinforced with inorganic {silanized ZrO2}, organic {Bisphenol A diglycidyl ether dimethacrylate (Bis-GMA)+Triethylene glycol dimethacrylate (TEGDMA)+Polyethylene glycol dimethacrylate (PEGDMA)} and hybrid {silanized ZrO2+Bis-GMA+ TEGDMA} Nanofibers. Materials and Methods: The study was divided into four groups according to the added nanofibers (6wt%) to heat curing PMMA denture base material; Control group: PMMA denturebase material without reinforcing nanofibers, Inorganic group: PMMA denture-base material with silanized ZrO2 nanofibers, Organic nanofibers group: PMMA denture-base material with Bis-GMA/ TEGDMA/PEGDMA nanofibers and, Hybrid nanofibers group: PMMA denture-base material with silanized ZrO2/Bis-GMA/TEGDMA nanofibers. For each group, 10 specimens were prepared and tested for surface roughness, microhardness, water sorption and water solubility. For each group 11 specimens were prepared and tested for color stability. Surface roughness was measured by optical method. Digital Microhardness tester was used to measure Vickers microhardness. Color stability was evaluated according to ISO/FDIS 20795-1 and ISO 7491, using a Portable Reflective Spectrophotometer. Water sorption (WSP) and water solubility (WSL) were performed according to ISO/FDIS 20795-1. One-way ANOVA was used for comparison between groups and Post-Hoc test (Tukey’s tests) was used for multiple comparisons. P-value different. Results: One-way ANOVA revealed insignificant differences between the studied groups in surface roughness (p=0.168) and color stability (p=0.806). Significant differences were found in microhardness (p=0.000), WSP (p=0.000) and WSL (p=0.000). Post-Hoc (Tukey’s test) revealed that: 1) microhardness means of nanofibers-reinforced groups were markedly significantly higher than control group (p=0.000). 2) WSP of organic nanofibers reinforced group was significantly lower than that of control (p=0.008), hybrid (p=0.001) and inorganic (p=0.000) groups that were not significantly different from each other (p≥0.243). 3) WSL of ZrO2 nanofibers reinforced group was significantly higher than control, organic, and hybrid groups (p=0.000). However, the control group was not significantly different from organic (p=0.992) and hybrid (P=0.018) groups. Organic group was significantly lower than hybrid group(p=0.009). Conclusions: Addition of 6% nanofibers prepared by electrospinning technique to PMMA denture resin significantly enhanced microhardness. Surface roughness and color stability were not affected. Water sorption was significantly reduced with organic nanofibers, but was not affected with ZrO2 and hybrid nanofibers. The highest water solubility for nanofibers reinforced groups recorded in this study was (0.46±0.04μg/mm3) which is nearly one third of the ISO limit (1.6μg/mm3). | ||||
| Keywords | ||||
| Inorganic; organic; Hybrid Nanofibers; PMMA Denture Base; Microhardness; Surface roughness; color stability; Water Sorption and Solubility | ||||
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