Abstract
Objective. The aim of this study was to evaluate the effect of incorporation of glass fiber, zirconia, and nano-zirconia on the transverse strength of repaired denture base. Materials and Methods. Eighty specimens of heat polymerized acrylic resin were prepared and randomly divided into eight groups (n = 10): one intact group (control) and seven repaired groups. One group was repaired with autopolymerized resin while the other six groups were repaired using autopolymerized resin reinforced with 2 wt% or 5 wt% glass fiber, zirconia, or nano-zirconia particles. A three-point bending test was used to measure the transverse strength. The results were analyzed using SPSS and repeated measure ANOVA and post hoc least significance (LSD) test (P ≤ 0.05). Results. Among repaired groups it was found that autopolymerized resin reinforced with 2 or 5 wt% nano-zirconia showed the highest transverse strength (P ≤ 0.05). Repairs with autopolymerized acrylic resin reinforced with 5 wt% zirconia showed the lowest transverse strength value. There was no significant difference between the groups repaired with repair resin without reinforcement, 2 wt% zirconia, and glass fiber reinforced resin. Conclusion. Reinforcing of repair material with nano-zirconia may significantly improve the transverse strength of some fractured denture base polymers.
Highlights
Denture fracture is a common problem in prosthodontic practice that troubles both patients and prosthodontists
Many attempts have been made to overcome this shortcoming via using reinforced repair material and/or modification of repair surface design and treatment
Preweighed glass fiber, zirconia, and nano-zirconia powder were separately added to the autopolymerized acrylic resin powder and thoroughly mixed using a mortar and pestle to achieve an equal distribution of particles and uniform color
Summary
Denture fracture is a common problem in prosthodontic practice that troubles both patients and prosthodontists. Denture repair depends on many variables including material type, material reinforcement, surface design, and surface treatment [2]. Several materials have been used to repair fractured denture bases, including autopolymerized, visible light polymerized, heat polymerized, or microwave polymerized acrylic resin [4, 5]. Most (86%) of denture base repairs are made with autopolymerized acrylic resin [6] because it is easy to manipulate and fast and can be used chair-side [7]. Many attempts have been made to overcome this shortcoming via using reinforced repair material and/or modification of repair surface design and treatment. Hanna et al investigated the effect of 45∘ bevel of the repair surface on the transverse strength of the repaired denture base and found that higher values were obtained [9]. It is appropriate to treat the repair surface with repair monomer as it modifies the surface structure and increases its bond to repair material [11,12,13]
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