Compositional, structural and mechanical comparisons of normal enamel and hypomaturation enamel

Area of Science:

• Biomineralization
• Dental Enamel Research
• Hereditary Dental Disorders

Background:

• Hypomaturation amelogenesis imperfecta is a genetic enamel defect impacting patient function and aesthetics.
• Understanding the pathological biomineralization process is crucial for effective treatment.

Purpose of the Study:

• To conduct a detailed comparative analysis of normal and hypomaturation enamel.
• To elucidate the biomineralization mechanisms in hypomaturation amelogenesis imperfecta.

Main Methods:

• Systematic testing on human permanent molars.
• Utilized microcomputed tomography, SEM, FTIR, Raman spectroscopy, micro-XRD, TGA, EDS, and Vickers microhardness testing.

Main Results:

• Identified dramatic contrasts in hierarchical structure, spectral features, crystallographic characteristics, and mechanical properties.
• Demonstrated that retained organic matrix and high carbonate content in hypomaturation enamel negatively affect mineral crystal quality, distribution, and hydroxyapatite properties.

Conclusions:

• The study highlights the critical role of the organic matrix in amelogenesis.
• Findings deepen the understanding of hypomaturation enamel biomineralization, explaining clinical symptoms and informing therapeutic strategies, biofabrication, and gene therapies.