الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 96 |  |  |
| | | from | 96 | | |
Abstract
The purpose of this research was to examine the impact of silver nanoparticles on the adhesion of germs to dental porcelain, as well as its colour change, flexural strength, hardness, and wear.
We put Vita 3D master porcelain through its paces for this experiment.
Each test’s mould was custom-made in accordance with the standards set out by the American Dental Association (ADA).
Standardizing the shape and size of the samples required the preparation of disc-shaped specimens (5 mm in diameter and 2 mm in thickness) in a split teflon mould for use in bacterial adhesion and colour change tests, cylindrical-shaped specimens (4 mm in diameter and 10 mm in thickness) for use in hardness and wear tests, and bar-shaped specimens (2 mm by 2.5 mm by 25 mm) for use in flexural strength measurements.
One hundred samples were divided evenly between two categories (50 each category).
For each test, take 10 samples.
group 1: The porcelain powder was combined with distilled water as a control (unaltered samples).
group 2 (samples treated with silver nanoparticles): Porcelain powder was combined with a solution containing silver nanoparticles.
The solution contained 200 ppm of silver nanoparticles.
Antibacterial, color-changing, flexural strength, microhardness, and wear tests were conducted on each set.
Silver nanoparticles were examined for their ability to kill germs using streptococcus mutans as a test organism.
Porcelain discs were made for both the control and modified groups, and then inserted in a tube with the inoculum (0.5 McFarland turbidity standard solution to make standard inoculum) and incubated for 7 days at.
Then, the swab was rolled gently over agar plates after being wet with a hydrated solution.
The effectiveness of silver nanoparticles as antibacterial agents was evaluated by measuring the number of colonies formed by each sample.
The colours of the test specimens were evaluated using a portable Reflective spectrophotometer.
The specimens were properly aligned with the instrument, and the aperture size was adjusted at 4 mm.
For these tests, the CIE L*a*b* colour space was used on a white backdrop.
The flexure strength of each sample was evaluated by placing it, horizontally, in a specially designed loading apparatus (three point bend test).
Formula: FS () =3F (L)/ 2wh2 was used to determine the value of FS throughout the computation process.
F = maximum force at the site of fracture, L = length, w = width, and h = height.
The specimens’ surface micro-hardness was measured using a Vickers micro-hardness tester outfitted with a Vickers diamond indenter and a 20X objective lens.
Two-body wear testing was conducted utilising a ROBOTA chewing simulator coupled with a thermo-cyclic methodology.
group II samples treated with silver nanoparticles demonstrated antibacterial activity against streptococcus mutans, as shown by a decrease in bacterial count (CFU).
The colour difference E was larger than the perceptibility threshold of DE*=2.69, as determined by the colour change test.
Silver nanoparticle modification of porcelain resulted in lighter samples than the control group.
The flexural strength of the porcelain samples (group II) was greater than that of the controls (group I).
There was no noticeable difference between the control group and the changed group in microhardness and wear testing.
Conclusions
First, it has been shown that incorporating silver nanoparticles into porcelain significantly reduces the number of viable bacteria in the material, as measured by the colony forming unit (CFU) count.
Two, the hue of dental porcelain was altered by the addition of silver nanoparticles.
3 The flexural strength of dental porcelain was improved by the use of silver nanoparticles.
Four, dental porcelain’s microhardness and wear resistance are unaffected by the incorporation of silver nanoparticles.
Evidence suggests that AgNps may be useful in combating bacterial colonisation and reducing the likelihood of future caries outbreaks.
Still, it had an undesirable effect on the hue.