S Mohammed Shafeeq1, S Karthikeyan1, Subash M Reddy2, Suma Karthigeyan3, R Manikandan1, Arthiie Thangavelu4. 1. Department of Prosthodontics, Vivekanandha Dental College for Women, Tiruchengode, Tamil Nadu, India. 2. Department of Prosthodontics, Oxford Dental College, Bengaluru, Karnataka, India. 3. Department of Prosthodontics, Rajah Muthaiah Dental College, Chidambaram, Tamil Nadu, India. 4. Department of Periodontics, J.K.K. Nataraja Dental College, Komarapalayam, Tamil Nadu, India.
Abstract
AIMS: To evaluate and compare the flexural strength and impact strength of conventional and microwave cured denture base resins before and after repeated sterilization using microwave energy to consider microwave curing as an alternative to the conventional method of sterilization. MATERIALS AND METHODS: The conventional heat cure acrylic resin (DPI heat cure material) Group A and microwave-polymerized acrylic resin (Vipi Wave Acrylic resin) Group B were used to fabricate 100 acrylic resins samples using a standard metal die of (86 mm × 11 mm × 3 mm) dimensions. The criterion was flexural strength and impact strength testing which had Group A and Group B samples; 50 samples for flexural strength and 50 samples for impact strength measurement. For each criterion, five control samples were taken for Group A and Group B. The samples were stored in water before experimenting. The test samples were subject to four cycles of microwave sterilization; followed by flexural strength testing with a 3-point flexural test in universal testing machine (UNITEK 94100) and impact strength testing with impact testing machine (ENKAY Pr09/E1/16). RESULTS: The physical properties had significant changes for conventionally cured denture base resins, whereas no changes found for microwave-cured resins after repeated sterilization cycles.
AIMS: To evaluate and compare the flexural strength and impact strength of conventional and microwave cured denture base resins before and after repeated sterilization using microwave energy to consider microwave curing as an alternative to the conventional method of sterilization. MATERIALS AND METHODS: The conventional heat cure acrylic resin (DPI heat cure material) Group A and microwave-polymerized acrylic resin (Vipi Wave Acrylic resin) Group B were used to fabricate 100 acrylic resins samples using a standard metal die of (86 mm × 11 mm × 3 mm) dimensions. The criterion was flexural strength and impact strength testing which had Group A and Group B samples; 50 samples for flexural strength and 50 samples for impact strength measurement. For each criterion, five control samples were taken for Group A and Group B. The samples were stored in water before experimenting. The test samples were subject to four cycles of microwave sterilization; followed by flexural strength testing with a 3-point flexural test in universal testing machine (UNITEK 94100) and impact strength testing with impact testing machine (ENKAY Pr09/E1/16). RESULTS: The physical properties had significant changes for conventionally cured denture base resins, whereas no changes found for microwave-cured resins after repeated sterilization cycles.
Entities:
Keywords:
Denture base resins; flexural strength; impact strength; microwave sterilization
Authors: Solimar M Ganzarolli; José A Nunes de Mello; Rosemary S Shinkai; Altair A Del Bel Cury Journal: J Biomed Mater Res B Appl Biomater Date: 2007-07 Impact factor: 3.368
Authors: Ewerton G Mima; Ana Claudia Pavarina; Karin Hermana Neppelenbroek; Carlos Eduardo Vergani; Denise Madalena P Spolidorio; Ana Lucia Machado Journal: J Prosthodont Date: 2007-12-17 Impact factor: 2.752