4D microstructural changes in dentinal tubules during acid demineralisation

Area of Science:

• Biomaterials Science
• Dental Research
• Materials Science

Background:

• Dental erosion causes irreversible loss of hard tissues due to acid exposure.
• Understanding dentine demineralization at the microstructural level (intertubular and peritubular dentine) is crucial for developing effective treatments.
• Current knowledge gaps exist regarding the specific demineralization processes within different dentine microstructures.

Purpose of the Study:

• To investigate the microstructural changes in human dentine during acid demineralization using a novel in vitro method.
• To quantify the demineralization rates and profiles of intertubular dentine (ITD) and peritubular dentine (PTD).
• To provide insights into the mechanisms of dentine demineralization for potential therapeutic advancements.

Main Methods:

• Utilized advanced high-speed synchrotron X-ray microtomography (SXM) for time-resolved 3D imaging.
• Conducted an in vitro study on human dentine samples over 6 hours of continuous acid exposure.
• Achieved high spatial resolution (0.325 μm) and temporal resolution (15 min) to capture microstructural changes.

Main Results:

• Quantified different demineralization rates for ITD (1.79 μm/min) and PTD (1.94 μm/min).
• Determined progressive width-depth profiles of demineralization in both ITD and PTD.
• Provided the first time-resolved 3D (4D) analysis of microstructural changes in dentine phases during acid exposure.

Conclusions:

• The study elucidates distinct demineralization behaviors of ITD and PTD, contributing to a deeper understanding of dental erosion.
• The developed in vitro method allows continuous examination of demineralization in significant dentine volumes.
• This research paves the way for developing novel therapeutic treatments for dentine and exploring remineralization strategies.