Comparative evaluation of surface roughness and impact strength of conventional polymethyl methacrylate and microcrystalline cellulose reinforced polymethyl methacrylate – An in vitro study
Aim: To evaluate and compare the surface roughness and impact strength of conventional polymethyl methacrylate (PMMA) with microcrystalline cellulose (MCC)-reinforced PMMA. Settings and Design: An in-vitro experimental study was conducted. Fifty PMMA specimens were fabricated and divided into five g...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2025-07-01
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| Series: | The Journal of Indian Prosthodontic Society |
| Subjects: | |
| Online Access: | https://journals.lww.com/10.4103/jips.jips_459_24 |
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| Summary: | Aim:
To evaluate and compare the surface roughness and impact strength of conventional polymethyl methacrylate (PMMA) with microcrystalline cellulose (MCC)-reinforced PMMA.
Settings and Design:
An in-vitro experimental study was conducted. Fifty PMMA specimens were fabricated and divided into five groups based on MCC concentration (2% or 5%) and particle size (20 μm or 50 μm).
Materials and Methods:
Specimens (80 mm × 10 mm × 4 mm) were categorized as follows: Group A (control; conventional PMMA), Groups B and D (2% MCC with 20 µm and 50 µm particles, respectively), and Groups C and E (5% MCC with 20 µm and 50 µm particles, respectively). Surface roughness was measured using a contact profilometer, and impact strength was tested with a ZwickRoell impact testing machine.
Statistical Analysis Used:
Statistical analysis was performed using IBM SPSS Version 28.0. One-way ANOVA followed by Tukey’s post hoc test was used to determine intergroup differences, with the significance level set at p<0.05.
Results:
Surface roughness was lower in Groups B (0.89±0.43), C (1.07±0.34), and E (0.77±0.27) compared to the control Group A (1.25±0.42), while Group D (1.84±0.25) showed higher values. Impact strength in Groups C (1.85±0.23), D (1.80±0.17), and E (1.81±0.26) was slightly lower than the control (1.88±0.31), though not statistically significant. However, Group B (1.56 ± 0.20) showed a significant reduction.
Conclusion:
The addition of 20 μm MCC reduced surface roughness at both 2% and 5% concentrations, whereas 50 μm MCC increased roughness at 2% but decreased at 5%. Impact strength remained comparable to the control in all groups except PMMA + 2% MCC (20 μm), which exhibited a significant decline. MCC reinforcement influences PMMA’s mechanical and surface properties, suggesting its potential for denture base modifications. |
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| ISSN: | 0972-4052 1998-4057 |