In vivo enamel fluid movement

Area of Science:

• Dentistry
• Biomaterials Science
• Microscopy

Background:

• Dental enamel is the hardest substance in the human body.
• Its micro-structure and permeability are crucial for tooth health and integrity.
• Understanding fluid dynamics within enamel is key to developing effective dental treatments.

Purpose of the Study:

• To visualize and confirm fluid movement through dental enamel in vivo.
• To investigate the relationship between tooth age and enamel permeability.
• To characterize the morphological evidence of fluid flow on the enamel surface.

Main Methods:

• Utilized vinyl polyxiloxane for impressions of human incisors (n=55).
• Created replicas using polyether impression material.
• Analyzed morphological images to identify signs of outward fluid flow.

Main Results:

• Confirmed enamel as a permeable substrate in vivo, evidenced by surface droplets.
• Demonstrated a significant inverse relationship between age and enamel permeability.
• Observed a decrease in the number and size of droplets with increasing age, with prominent droplets along perikymata in younger teeth.

Conclusions:

• Dental enamel exhibits in vivo permeability, facilitating fluid movement.
• Enamel permeability is significantly influenced by age, decreasing as teeth mature.
• The findings provide novel insights into enamel's dynamic nature and age-related changes.