The comparison of surface hardness, water sorption and staining resistance between thermoplastic nylon and heat-cured acrylic resin.

Comparison of nylon and heat-cured acrylic resin

  • Aruna Kumari Samarla, Government Dental College, RIMS, Kadapa
  • Krishna Alla Vishnu Dental College, Bhimavaram
  • Deepika Bolisetty Private Practice , Hyderabad
  • Yashika Bali BJS Dental College and Hospital, Ludhiyana . Punjab,
  • Yashika Bali BJS Dental College and Hospital, Ludhiyana . Punjab,
  • Prema Balehonnur Government Dental College and Research Institute, Bangalore
  • Baburajan Kandasamy RVS Dental College and Hospital Sulur, Coimatore, Tamilnadu,
Keywords: nylon denture base materials, Polymethylmethacrylate, staining resistance, surface hardness, water sorption,

Abstract

Aim: To evaluate and compare the surface hardness, water sorption and staining resistance of conventional heat cure and nylon denture base materials.

Materials and Methods: A total of 120 specimens, which comprises thirty from each denture base materials (Acralyn-H, DPI, Valplast and Flexident), were fabricated by investing metal specimen analogues of dimension 65x10x2.5mm strips for hardness, 50x0.5mm discs for water sorption and 20x1mm discs for staining resistance according to ADA specification no.12. The surface hardness was evaluated using Shore D Durometer. Water sorption was tested by the differences in the weight of the specimens by desiccating in calcium chloride and immersing in water for one week.  The specimens were placed in a staining solution of 3% tartrazine for 7days. Staining resistance was evaluated by the optical density of the extraction solvent (ethanol) using spectrophotometer.

Results: Heat cure acrylic denture base materials demonstrated more surface hardness compared to nylon based denture materials. Tukey’s HSD showed significant differences (p<0.05) in the hardness of heat cure and nylon denture base materials. The water sorption values of Acralyn-H, DPI and Valplast were comparable and showed a statistically significant difference (p<0.05) in the water sorption with Flexident. In staining resistance test, Valplast demonstrated more optical density whereas the optical densities of the others materials were comparable. Valplast materials displayed significant differences (p<0.05) in staining resistance with heat cure denture base materials.

Conclusions: Both the heat cure denture base materials exhibited greatest surface hardness compared to the flexible denture base materials. Flexident displayed the lowest water sorption and Valplast had the least staining resistance.

Key words:

Polymethylmethacrylate, nylon denture base materials, staining resistance., urface hardness, water sorption,

 

 

 

Author Biographies

Aruna Kumari Samarla,, Government Dental College, RIMS, Kadapa

Assistant Professor,

Department of Prosthodontics, 

Krishna Alla, Vishnu Dental College, Bhimavaram

Assistant Professor,

Department of Dental Materials,

Deepika Bolisetty, Private Practice , Hyderabad
  1.  

Private Practitioner

 

 

Yashika Bali, BJS Dental College and Hospital, Ludhiyana . Punjab,

Senior Lecturer, Department of Prosthodontics and Crown and Bridge

 

Yashika Bali, BJS Dental College and Hospital, Ludhiyana . Punjab,

Senior Lecturer, Department of Prosthodontics and Crown and Bridge

 

Prema Balehonnur, Government Dental College and Research Institute, Bangalore

Associate Professor,

Department of Prosthodontics

 

Baburajan Kandasamy, RVS Dental College and Hospital Sulur, Coimatore, Tamilnadu,

 

Professor and Head, Department of Prosthodontics

RVS Dental College and Hospital

Sulur, Coimatore, Tamilnadu, India

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Published
2021-03-05
How to Cite
Samarla, A. K., Alla, K., Bolisetty, D., Bali, Y., Bali, Y., Balehonnur, P., & Kandasamy, B. (2021). The comparison of surface hardness, water sorption and staining resistance between thermoplastic nylon and heat-cured acrylic resin. UNIVERSITY JOURNAL OF DENTAL SCIENCES, 7(1). Retrieved from https://ujds.in/index.php/ujds/article/view/354