Flexural and impact properties of PMMA nano composites and PMMA hybrids nano composites used in dental applications

الملخص EN

Due to the enjoyment of poly methyl methacrylate material of significant advantages in mechanical and physical properties, which encouraged many researchers in recent years working on the used it’s as a prosthodontics denture base material.

In the present research, efforts are made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition four different types of nanoparticles powders, which are fly ash, fly dust, zirconia and aluminum that added with different ratios of volume fractions of (1%, 2% and 3%) to poly methyl methacrylate (PMMA), cold cured resin (castavaria) is the new fluid resin (pour type) as a matrix.

In this work, the Nano composite and hybrid Nano composite for prosthetic dentures specimens, preparation was done by using (Hand Lay-Up) method as six groups which includes: the first three groups consists of PMMA resin reinforced by fly ash , fly dust and ZrO2 nanoparticles respectively, the second three groups consists of three types of hybrid Nano composites, which includes ((PMMA: X%nF.A)+(1%Al+3%ZrO2)), ((PMMA: X%nF.D)+ (1%Al + 3%ZrO2)) and ((PMMA - nZrO2)+(1%F.A + 3%F.D)) respectively.

PThe flexural and impact tests results show that the values of the flexural strength, Maximum Shear stress, flexural modules, impact strength and fracture toughness increased with the addition of nano powders (fly ash, fly dust, zirconia and aluminum).

And the results showed that the maximum values of flexural strength and Maximum shear stress reaches to 101Mpa and 2.4738Mpa respectively for (PMMA: 2%nF.D) Nano composite.

Moreover, the results showed that the maximum values of flexural modules for hybrid Nano composite ((PMMA: 3% nF.A) + (1%Al + 3%ZrO2)) reach to 13.95 Gpa, whereas the maximum values of impact strength reaches to 7.8KJ/mP 2 P for (PMMA: 1% nF.D) Nano composite.

And, the results showed that the maximum values of fracture toughness for Nano composite reach to 26.8 Mpa.mP 1/2 P for (PMMA: 3% nF.D) Nano composite.