Comparison of flexural strength of Kevlar, glass, and nylon fibers reinforced denture base resins with heat polymerized denture base resins
Karthik Kannaiyan1, M Biradar Sharashchandra2, Swetha Kattimani3, Malati Devi4, Boinapelli Vengal Rao5, Sudarshan Kumar Chinna6
1 Department of Prosthodontics, Faculty of Dentistry, Melaka-Manipal Medical College, Melaka, Malaysia
2 Department of Periodontics, S. B. Patil Institute of Dental Science, Bidar, Karnataka, India
3 Department of Oral Medicine and Radiology, A. M. E’s Dental College and Hospital, Raichur, Karnataka, India
4 Department of Pedodontics and Preventive Dentistry, SVS Institute of Dental Sciences, Mahabubnagar, Telangana, India
5 Department of Public Health Dentistry, KSR Institute of Dental Science and Research, Tiruchengode, Tamil Nadu, India
6 Department of Public Health Dentistry, K. L. E. Dental College and Hospital, Bangalore, Karnataka, India
Department of Prosthodontics, Faculty of Dentistry, Melaka-Manipal Medical College.
Source of Support: None, Conflict of Interest: None
Introduction: Polymethyl methacrylate (PMMA) has been widely accepted and used in dentistry owing to its working characteristics, aesthetics and stability in the oral environment, ease in manipulation, and inexpensive processing methods and equipment. Aim and Objectives: The aim of this study was to evaluate the flexural strength of a high-impact PMMA denture base resin material and flexural strength of a commonly available heat cure PMMA denture base material with Kevlar, glass, and nylon fibers. Materials and Methods: The test samples were studied under two groups. The Group I (control group) comprised pre-reinforced PMMA (Lucitone 199; Dentsply Sirona Prosthetics, York, Pennsylvania, USA) consisting of 12 samples and second group comprised regular PMMA (DPI, Mumbai, India) reinforced with different fibers. The second test group was further divided into three subgroups as Group 2, Group 3, and Group 4 comprising 12 samples each designated by the letters a–l. All the samples were marked on both ends. A total of 48 samples were tested. Results were analyzed and any P value ≤0.05 was considered as statistically significant (t test). Results: All the 48 specimens were subjected to a 3-point bending test on a universal testing machine (MultiTest 10-i, Sterling, VA, USA) at a cross-head rate of 2 mm/min. A load was applied on each specimen by a centrally located rod until fracture occurred; span length taken was 50 mm. Flexural strength was then calculated. Conclusion: Reinforcement of conventional denture base resin with nylon and glass fibers showed statistical significance in the flexural strength values when compared to unreinforced high impact of denture base resin.