Comprehensive Analysis of Repair/Reinforcement Materials for Polymethyl Methacrylate Denture Bases: Mechanical and Dimen
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ORIGINAL ARTICLE
Comprehensive Analysis of Repair/Reinforcement Materials for Polymethyl Methacrylate Denture Bases: Mechanical and Dimensional Stability Characteristics R. Venkat • N. Gopichander • M. Vasantakumar
Received: 15 May 2012 / Accepted: 29 December 2012 Indian Prosthodontic Society 2013
Abstract Fracture of complete denture is a common problem as acrylic resins hold inherent limitations. This necessitates affirmation of a selection criterion by evaluating the critical requirements of repair materials. The study intended to evaluate mechanical properties and dimensional stability of common denture base repair and reinforcement materials under standard experimental protocol. Seven types of denture reinforcement materials were chosen. Forty cuboidal samples were made in accordance with ISO 178 for three point bending test and divided to eight groups of five samples each. One group acted as control and samples of seven groups were sectioned and repaired with chosen materials. Five mechanical properties—fracture load, deflection, flexural strength, fracture toughness and elastic modulus were evaluated for all groups. Forty mandibular complete denture specimens were utilized for evaluating fracture load and deflection under loading. Dimensional stability after repair with seven different repair materials was analyzed in two planes (Linear and curvilinear) utilizing separate set of denture samples. Heat cure polymethyl methacrylate with polyethylene fiber was affirmed as material of choice based on this study as it accomplishes the most critical norms of requirement. Keywords Edge profile Curvilinear Fatigue Fracture Deflection Cyclic loading and micro-flaws R. Venkat N. Gopichander M. Vasantakumar Department of Prosthodontics, SRM Dental College, Ramapuram, Chennai 600089, India
Introduction Repair and reinforcement of the polymethyl methacrylate (PMMA) resin denture base with different materials have been tried and documented in the literature which include stainless steel alloy wires [1–4], polyethylene fibers [5–10], glass fibers [11–14], carbon fibers [15], polyaramid fibers [16] and alloy mesh [17]. Among the materials employed, the superiority of one over the other has not been clearly analyzed in the literature and the basic requirements for a repair material have not been affirmed. Considering the major shortcomings of PMMA resins that include fatigue failure [18], susceptibility to fracture [19] and dimensional instability [20], this study was intended to establish a material of choice for denture repair by analyzing seven different repair and reinforcement materials that are commonly used and comparing their mechanical and dimensional stability properties with that of unreinforced PMMA resin.
Materials and Methods The seven types of denture reinforcement that were evaluated in the study included: • •
• N. Gopichander (&) 496, 3rd Main Road, TNHB Colony, Velachery, Chennai 600042, India e-mail: [email protected]
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Autopolymerizing PMMA—DPI-RR Cold cure, India [—Trade n
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