الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 111 |  |  |
| | | from | 111 | | |
Abstract
The purpose of that study was to contrast the surface roughness and fracture strength of dentures fabricated from conventional PMMA and that dentures fabricated from PMMA treated with TiO2 nanoparticles.
Twenty completely edentulous dentures fabricated according to manufacturing instructions and divided into two groups based on the materials that were tested.
A ready-made Epoxy model of mandibular completely dentulous ridge was used and two equal implants (3.5 mm diameter/ 10 mm in length ) had been inserted in the canine areas bilaterally, then those two implant received two identical ball abutment attachments.
group A: ten dentures were made from PMMA, and group B: ten dentures were made from PMMA modified with TiO2 nanoparticles.
After the construction of all dentures, a calliper was used to measure the denture base ‘s thickness. The average thickness was measured at 2mm for all dentures. Pick up procedure was done for all dentures by using chemical cured PMMA material.
Every denture’s surface roughness was measured with a profilometer. where the profilometer can detect even minute surface differences by stylus touching the denture surface, then a digital signal from stylus displayed on the profilometer screen. Next, determine each denture’s fracture strength using the universal testing apparatus. All data was counted and recorded separately, then sent to statistical analysis.
The outcomes demonstrated that there was a statistically significant difference between the two groups’ surface roughness and fracture strength. The dentures fabricated from PMMA modified with TiO2 nanoparticles had greater surface roughness and fracture strength than the dentures fabricated from conventional PMMA.
Given the constraints of the previous study, we can conclude that:
- Dentures were constructed from acrylic resin modified with Salinized TiO2 Nps had a higher surface roughness than the dentures that were constructed from acrylic resin only.
- Dentures were constructed from acrylic resin modified with Salinized TiO2 Nps had a higher fracture strength than the dentures that were constructed from acrylic resin only.
Recommendation
Addition of TiO2 NPs improves specific mechanical characteristics, but the level of surface roughness also rises. Therefore, it is necessary to investigate and suggest other ways to reduce surface roughness.
We should take the limitations of the study into consideration, where it was an in vitro study. So, more clinical investigations and studies are recommended and ensuring meticulous oral hygiene measures from the patient to reduce bacterial accumulation at the denture surface because of the decreased surface roughness.