Effect of phosphate ester addition on transverse strength and hardness of heat cured acrylic denture base material

Abstract EN

Background: acrylic resin denture base consider a common denture base material for its acceptable cost, aesthetic and easy processing but still has disadvantages including easy of fracture and low impact strength.

Material and method: The experimental group was prepared by addition of 15% phosphoric acid 2-hydroxyethyl methacrylate ester (PA2HEME) with polymethyl methacrylate monomer; the experimental groups was compared with the control one.

The specimens were prepared according to ADA specification No.

12 with dimension 65 mm x 10 mm x2.5 mm (length x width x thickness respectively).

The prepared specimens were tested by three-point flexural strength utilizing Instron Universal Testing Machine (WDW, Layree Technology Co.), Shore D hardness tester used to measure hardness test.

Statistical analysis used student T- test, mean and standard deviation.

Results: The result of PA2HEME group showed high significant reduction comparing to the control group for both transverse strength and hardness test.

Conclusion: Mixing 15% of PA2HEME with 85% methyl methacrylate (MMA) can reduce the mechanical properties of new modified polymethyl methacrylate (PMMA) acrylic resin