Micro-Hardness and Fracture Toughness of Thermosens Thermoplastic Material Versus
the Conventional Heat-Cured Acrylic Resin After One Year of Water Storage
Ibrahim Mohamed Hamouda1,2* and Hanadi A Lamfon3
1Professor of Dental Biomaterials, Department of Restorative Dentistry, Faculty of
Dentistry, Umm Alqura University, Makkah, KSA
2Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University,
3Associate Professor of Prosthetic branch of Maxillofacial and Oral Rehabilitation
Department, Faculty of Dentistry, Umm Alqura University, Makkah, KSA
*Corresponding Author: Ibrahim Mohamed Hamouda, Professor of Dental
Biomaterials, Department of Restorative Dentistry, Faculty of Dentistry, Umm
Alqura University, Makkah, KSA.
Received: February 15, 2023; Published: March 02, 2023
Objectives: The aim of this study was to evaluate the aged micro-hardness and fracture toughness of thermoplastic resin (ThermoSens) versus the conventional denture base resin (Major base 20).
Materials and Methods: For the hardness test, 20 square-shaped specimens (12 mm x 12 mm x 3 mm thickness) were prepared from both denture base materials using a stainless die. The hardness was measured for each specimen using a micro-hardness tester. For the fracture toughness testing, 20 rectangular specimens were prepared from both denture base materials using stainless steel plate. The specimen dimensions were 65 mm length, 10 mm width and 2.5 mm thickness. Each specimen has a central V-shaped notch of 2.5 mm depth. The fracture toughness was measured by a three-point bending test using a universal Lloyd testing machine.
Results: The conventional denture base resin (Major base 20) showed significantly higher hardness than that of thermoplastic denture base material (ThermoSens). On the other hand, thermoplastic denture base material (ThermoSens) showed significantly higher fracture toughness than that of the conventional denture base resin (Major base 20).
Conclusion: After one year of water storage, thermoplastic denture base material (ThermoSens) has higher fracture toughness and lower micro-hardness than that of the conventional denture base resin (Major base 20).
Keywords: Thermoplastic Denture Base; Heat-Cured Material; Micro-Hardness; Fracture Toughness
- Ibrahim M Hamouda and Alaa Makki. “History and Development of Polymeric Denture Base Reinforcement”. Acta Scientific Dental Sciences6 (2022): 111-121.
- Anusavice KJ., et al. “Phillips' Science of Dental Materials, 12th edition”. Saunders Elsevier, St. Louis, Missouri 63146 (2013): 144-145,475-490.
- Marcelo Coelho Goiato., et al. “Effect of accelerated aging on the microhardness and color stability of flexible resins for dentures”. Brazilian Oral Research 1 (2010): 114-119.
- Mc Cabe JF and Walls AW. “Applied dental materials. 8th edition”. Chapter 13; Denture base polymers. Black well science Ltd. London (2002): 96-106.
- Lamfon H and Hamouda IM. “Maxillary denture flange and occlusal discrepancies of Vertex ThermoSens in comparison with conventional heat-cured denture base materials”. The Journal of Biomedical Research2 (2019): 139-144.
- Craig RG and Powers JM. “Restorative dental materials. 11th edition”. St Louis, Missouri: Elsevier (2002): 621-637.
- Hamouda IM and Faramay AMG. “Aged Flexural Properties of Vertex Thermosens versus Conventional Denture Base Materials for One Year Water Storage”. Austin Journal of Dentistry 2 (2018): 1101.
- El-Khodary NM., et al. “Laboratory Evaluation of Newly Formulated Thermoplastic Resin Complete Denture Base Materials”. IJSR 5 (2016): 1815-1821.
- Vojdani M., et al. “Effect of aluminium oxide addition on the flexural strength, surface hardness, and roughness of heat-polymerized acrylic resin”. Journal of Dental Sciences 3 (2012): 238-244.
- Sikka JP., et al. “Comparison of Fracture Toughness between Four Different Types of Heat Activated Denture Base Resins before and after Exposure to Electron Beam Irradiation: An In vitro Study”. European Journal of Molecular and Clinical Medicine10 (2020): 3120-3127.
- Al-Haddad A., et al. “Fracture toughness of heat cured denture base acrylic resin modified with Chlorhexidine and Fluconazole as bioactive compounds”. Journal of Dentistry 42 (2014): 180-184.
- Parvizi A., et al. “Comparison of the Dimensional Accuracy of Injection-Molded Denture Base Materials to that of Conventional Pressure-Pack Acrylic Resin”. Journal of Prosthodontics2 (2004): 83-89.
- Craig RG and Powers JM. “Restorative dental materials”. 11th St Louis, Missouri: Elsevier (2002): 640-644.
- Shah J., et al. “Comparative Evaluation of Sorption, Solubility and Microhardness”. Journal of Clinical and Diagnostic Research8 (2014): ZF01-ZF04.
- Abhay PN and Karishma S. “Comparative evaluation of impact and flexural strength of four commercially available flexible denture base materials: an in vitro study”. The Journal of Indian Prosthodontic Society 13 (2013): 499-508.
- Arora A., et al. “Evaluation of fracture resistance of ceramic veneers with different preparation designs and loading conditions: An in vitro study”. The Journal of Indian Prosthodontic Society 17 (2017): 325-331.
- Barsby MJ. “A denture base resin with low water absorption”. Journal of Dentistry 4 (1992): 240-244.
- Yunus N., et al. “Some flexural properties of a nylon denture base polymer”. Journal of Oral Rehabilitation 32 (2005): 65-71.
- Seo RS., et al. “Influence of thermal and mechanical stresses on the strength of intact and relined denture bases”. Journal of Prosthetic Dentistry 96 (2006): 59-67.
- Shen C., et al. “Phillips, Science of Dental Materials, 13th edition”. Elsevier, S. Luis Missouri (2022): 247.
- Shatta M., et al. “Surface Hardness Evaluation of a Thermoplastic Nylon Denture Base Material”. Al-Azhar Journal of Dental Science4 (2020): 343-346.
- Oliveira R., et al. “Porosity, residual monomer and water sorption of conventional heat-cured and cross-linked acrylic resins”. Clinical and Laboratorial Research in Dentistry 3 (2014): 137-144.
- Mohsin HA., et al. “Evaluating some Mechanical and Physical Properties of Vertex Thermosens Denture base Material in Comparison with Heat Cure Acrylicdenture Base Material”. International Journal of Science and Research (IJSR)5 (2017): 394-397.
- Singh K., et al. “Materials for Aesthetical Removable Partial Denture Framework”. Journal of Clinical and Diagnostic Research10 (2013): 2372-2373.