Comparative study of the Compressive Strength of Heat-Cure Acrylic Resin with flexible thermoplastic acrylic
Subject Areas : Prosthodontics
Saeed Abolhasani taraghipour
1
,
Farnoosh Golmohammadi
2
,
Zahra Ghasemi
3
1 - Faculty of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
2 - Department Of Prosthetic Dentistry, Faculty of Dentistry, Islamic Azad University, Isfahan (Khorasgan) Branch, Iran
3 - Department Of Prosthetic Dentistry, Faculty of Dentistry, Islamic Azad University, Shiraz Branch, Iran
Keywords: Compressive Strength, Acrylic Resins, Denture, Partial, Removable,
Abstract :
Backgrounds: Due to the fragility of acrylic in low thicknesses and width of partial prostheses, it is recommended to replace small modifications with fixed prostheses, but sometimes we have to use partial acrylic prostheses. The aim of this study was to examine the compressive strength of heat-cure acrylic with flexible acrylic. Materials and Methods: In this experimental study ten blocks sized 25 × 2.5 ×10 mm were prepared from each acrylic sample. Universal test machine was used to measure the compressive strength of the samples. Data obtained were analyzed using Wilcoxon test (α = 0.05). Results: At about mm compression, heat-cure acrylic fractured and the mean compressive strength was 6464.60 ±1288.2279 MPa. The mean force on the flexible acrylic at about 1mm compression was 2830± 323/350 MPa. The difference between the two forces was significant. (P = 0.005). The mean compressive strength of flexible acrylic was 5436.60 ± 507.073 MPa. The compressive strength of flexible acrylic was lower than heat-cure acrylic (P = 0.028). Conclusion: At the same compression rate, the force applied to the flexible acrylic is less than half the force applied to the heat-cure acrylic and in the case of making prostheses, the amount of force on the edentulous ridge at the same bite force is significantly less in dentures with flexible acrylic. Since it is important to introduce necessary transmitted occlusion forces to maintain the continuity of the edentulous ridge, heat cured acrylic is preferred. On the other hand, despite lower compressive strength, flexible acrylic is resistant to fracture and can be successfully used in small modifications of removable partial dentures.