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Denture fractures are common in daily practice, causing inconvenience to the patient
and to the dentists. Denture repairs should have adequate strength, dimensional
stability and color match, and should be easily and quickly performed as well as
relatively inexpensive.ObjectiveThe aim of this study was to evaluate the flexural strength of acrylic resin
repairs processed by different methods: warm water-bath, microwave energy, and
chemical polymerization.Material and methodsSixty rectangular specimens (31x10x2.5 mm) were made with warm water-bath acrylic
resin (Lucitone 550) and grouped (15 specimens per group) according to the resin
type used to make repair procedure: 1) specimens of warm water-bath resin
(Lucitone 550) without repair (control group); 2) specimens of warm water-bath
resin repaired with warm water-bath; 3) specimens of warm water-bath resin
repaired with microwave resin (Acron MC); 4) specimens of warm water-bath resin
repaired with autopolymerized acrylic resin (Simplex). Flexural strength was
measured with the three-point bending in a universal testing machine (MTS 810
Material Test System) with load cell of 100 kgf under constant speed of 5 mm/min.
Data were analyzed statistically by Kruskal-Wallis test (p<0.05).ResultsThe control group showed the best result (156.04±1.82 MPa). Significant
differences were found among repaired specimens and the results were decreasing as
follows: group 3 (43.02±2.25 MPa), group 2 (36.21±1.20 MPa) and group 4 (6.74±0.85
MPa).ConclusionAll repaired specimens demonstrated lower flexural strength than the control
group. Repairs with autopolymerized acrylic resin showed the lowest flexural
strength.
The majority of cases showed that horizontal and vertical measurements of the face cannot be used as a reference for determining the morphology of the maxillary central incisor crown. It is relevant to analyze and compare other morphological structures to improve the oral health-related quality of life for the conventional denture wearer.
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