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Open AccessArticle

Influence of Different Repair Acrylic Resin and Thermocycling on the Flexural Strength of Denture Base Resin

1
Department of Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh 11454, Saudi Arabia
2
Department of Prosthodontics, College of Dentistry, King Khalid University, Abha 62529, Saudi Arabia
*
Author to whom correspondence should be addressed.
Medicina 2020, 56(2), 50; https://doi.org/10.3390/medicina56020050
Received: 28 November 2019 / Revised: 12 January 2020 / Accepted: 15 January 2020 / Published: 21 January 2020
(This article belongs to the Special Issue Oral Health: Economic and Psychological–Behavioral Implications)
Background and Objectives: Fractured acrylic denture base is a common occurrence in clinical practice. The effective denture repair procedure is cost-effective, time conserving, and results in lesser time without denture for the patient. Along with various reinforcements and surface modifications; different acrylic resins are investigated in improving the flexural strength of the fractured site. The aim of this study was to evaluate the flexural strength of a polymethyl methacrylate (PMMA) denture base repaired with heat-polymerized (HPA), auto-polymerized (APA) and light-polymerized acrylic (LPA) resins after thermocycling. Materials and Methods: Forty rectangular shaped (50 mm × 25 mm × 3 mm) PMMA specimens were fabricated. Group 1 specimens (n = 10) were kept as controls and the remaining 30 samples were sectioned at the center with a repair site dimension of 3 mm. The samples from three groups (n = 10) were repaired with HPA, APA, and LPA resins, respectively. The specimens were thermocycled for 5000 cycles and subjected to a three-point flexural test. The maximum load required to fracture the specimens was recorded, and further analyzed with ANOVA and the Games-Howell Post hoc test at the significance level p = 0.05. Results: The average maximum load and flexural strength of the control group was 173.60 N and 13.02 Mpa and corresponding values for denture repaired with HPA was 87.36 N and 6.55 Mpa. The corresponding values for APA resin and LPA resins were 62.94 N, 57.51 N, and 4.72 Mpa, 4.06 Mpa, respectively. Conclusions: The PMMA specimens repaired with HPA resins resulted in a significantly higher load to fracture compared to APA resin and LPA resin. View Full-Text
Keywords: polymethylmethacrylate; denture fracture; denture repair; light cure acrylic; flexural strength; self-cure acrylic polymethylmethacrylate; denture fracture; denture repair; light cure acrylic; flexural strength; self-cure acrylic
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AlQahtani, M.; Haralur, S.B. Influence of Different Repair Acrylic Resin and Thermocycling on the Flexural Strength of Denture Base Resin. Medicina 2020, 56, 50.

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