Newbridge Dental

Newbridge Dental
1a Charlotte Street,
Co. Kildare
T: 045 431 676

Opening hours
Monday, Tuesday

8.30am-1.00pm; 2.00pm-5.30pm
Wednesday, Thursday
8.00am-1.00pm; 2.00pm-5.30pm
8.30am-1.00pm; 2.00pm-5.30pm

Reception opening hours
Monday - Friday
9am-1.00pm; 2.00pm-5.30pm

News - September 2020

Polymers prevent potentially hazardous mist during dentist visit

dfdfdIn a paper published this week in Physics of Fluids, Alexander Yarin and his colleagues at the University of Illinois discovered that food-grade polymers, such as polyacrylic acid, can eliminate aerolisation from the force of a vibrating tool or dentist's drill when they are used as a small admixture to water in dental settings. This is significant because there are concerns that aerosolisation from dental procedures can cause viruses to spread.
Their results were surprising. A small admixture of polymers eliminated aerosolisation, exhibiting fundamental polymer physics, such as coil-stretch transition. They tested two FDA-approved polymers. Polyacrylic acid proved more effective than xanthan gum, because in addition to its high elastic stresses in stretching, it revealed a relatively low shear viscosity, which makes pumping it easy.
"What was surprising is that the very first experiment in my lab completely proved the concept," Yarin said, "It was amazing that these materials were capable of so easily and completely suppressing aerosolisation by dental tools, with significant inertial forces involved. Nevertheless, the elastic forces generated by small polymer additives were stronger”.
Their study documented the explosion of pockets of water supplied to teeth and gums that dental tools aerosolise. The spraying mist that accompanies a visit to the dentist is the result of water encountering rapid vibration of a tool or the centrifugal force of a drill, which bursts water into tiny droplets and propels these.
The polymer admixture, when used to irrigate, suppresses bursts; instead, polymer macromolecules that stretch like rubber bands restrict water aerosolisation.



Stopping tooth decay before it starts – without killing bacteria

dfdfdOral bacteria are ready to spring into action the moment a dental hygienist finishes scraping plaque off a patient's teeth. Eating sugar or other carbohydrates causes the bacteria to quickly rebuild this tough and sticky biofilm and to produce acids that corrode tooth enamel, leading to cavities. Scientists now report a treatment that could someday stop plaque and cavities from forming in the first place, using a new type of cerium nanoparticle formulation that would be applied to teeth at the dentist's office.
Russell Pesavento, the project's principal investigator, wanted to find something that wouldn’t indiscriminately kill bacteria in the mouth and that would help prevent tooth decay, rather than treat cavities after the fact. He and his research group turned to cerium oxide nanoparticles. Other teams had examined the effects of various types of cerium oxide nanoparticles on microbes, though only a few had looked at their effects on clinically relevant bacteria under initial biofilm formation conditions.
When the researchers seeded polystyrene plates with S. mutans in growth media and fed the bacteria sugar in the presence of the cerium oxide nanoparticle solution, they found that the formulation reduced biofilm growth by 40% compared to plates without the nanoparticles, though they weren't able to dislodge existing biofilms. Under similar conditions, silver nitrate -- a known anti-cavity agent used by dentists -- showed no effect on biofilm growth. Pesavento would like to combine the nanoparticles with enamel-strengthening fluoride in a formulation that dentists could paint on a patient's teeth.



Atomic force microscopy reveals nanoscale dental erosion from beverages

dfdfdResearchers used atomic force microscopy (AFM) to evaluate how acidic and sugary drinks affect human tooth enamel at the nanoscale level. This approach is useful for measuring changes that occur over time during enamel erosion induced by beverages.
Enamel is the hard-white substance that forms the outer part of a tooth. Its resilient surface is 96% mineral, the highest percentage of any body tissue, making it durable and damage resistant. The enamel acts as a barrier to protect the soft inner layers of the tooth, but can become susceptible to degradation by acids and sugars.
Once tooth enamel is damaged, it cannot be brought back. A research team led by Prof. Seungbum Hong from the Korea Advanced Institute of Science and Technology (KAIST) reported a new method of applying ATM techniques to study the nanoscale characterisation of this early stage of enamel erosion. This study was introduced in the Journal of the Mechanical Behavior of Biomedical Materials (JMBBM) on June 29.
The authors of the study chose three commercially available popular beverages, Coca-Cola, Sprite, and Minute Maid, and immersed tooth enamel in these drinks over time to analyse their impacts on human teeth and monitor the etching process on tooth enamel.
The researchers observed that the surface roughness of the tooth enamel increased significantly as the immersion time increased, while the elastic modulus of the enamel surface decreased drastically. It was demonstrated that the enamel surface roughened five times more when it was immersed in beverages for 10 minutes, and that the elastic modulus of tooth enamel was five times lower after five minutes in the drinks.