Improving understanding of how acid damages teeth

15 October 2021
1 min read

The University of Surrey and the School of Dentistry at the University of Birmingham have developed a new technique, called “in situ synchrotron X-ray microtomography”, to improve understanding of how acid damages teeth at the microstructural level. 

The research aims to develop knowledge that leads to new treatments that can restore the structure and function of dentine. It has been performed at a special particle accelerator facility, Diamond Light Source, with which the University of Surrey have a strong working partnership.

Media outlet Eureka Alert explained the how the technique works, “Electrons were accelerated to near light speed to generate bright X-rays that were used to scan dentine samples while they were being treated with acid. This enabled the team to build clear 3D images of dentine’s internal structure with sub-micrometre resolution (a micrometre being one-thousandth of a millimetre). By analysing these images over the six hours of the experiment, the researchers conducted the first-ever time-resolved 3D study (often referred to as 4D studies) of the dentine microstructural changes caused by acid.

“The study, published in Dental Materials, highlights that acid dissolves the minerals in different structures of dentine at different rates. Dentine forms the main bulk of human teeth and supports the enamel, which covers the crown surface, helping to make teeth strong and resilient, but acids from dental plaque can cause tooth decay which affects the integrity of the dental structure. This research aims to develop knowledge that leads to new treatments that can restore the structure and function of dentine. “

Dr Tan Sui, senior lecturer in Materials Engineering at the University of Surrey, led the research group, and said, “Relatively little is known about how exactly acid damages the dentine inside our teeth at a microstructural level. This new research technique changes that and opens the possibility of helping identify new ways to protect dental tissues and develop new treatments.” 

Nathanael Leung, a final year PhD student at the University of Surrey, has been awarded a GSK Award 2021 by the Oral and Dental Research Trust. He will continue to study the mechanical response of dentine to masticatory forces in correlation with the microstructural changes that acid causes as well as in response to different treatments like fillings and crowns. 

This research is part of an ongoing collaboration with Professor Gabriel Landini and Richard Shelton at the School of Dentistry, University of Birmingham.