Three-dimensional anatomy of equine incisors: tooth length, enamel cover and age related changes.
Authors: Schrock Patricia, Lüpke Matthias, Seifert Hermann, Staszyk Carsten
Journal: BMC veterinary research
Summary
# Editorial Summary Equine incisor teeth experience relentless occlusal wear throughout life, yet horses maintain functional bite height through continued apical tooth eruption—a compensation mechanism that remains incompletely understood in three dimensions. Using micro-computed tomography datasets, Schrock and colleagues conducted detailed morphometric analysis of both the visible crown and subgingival tooth anatomy across different age groups, mapping how enamel distribution and internal tooth structure adapt with advancing years. The research revealed significant age-related changes in the intraalveolar portion of incisors, with progressive shifts in the relationship between crown height, root length, and enamel coverage that correlate with the continuous wear process. These findings provide anatomical evidence supporting the eruption compensation theory and offer quantifiable reference data for assessing abnormal wear patterns, dental pathology, and age estimation accuracy in clinical practice. For practitioners involved in dental assessment, equine dentistry, and age-related soundness evaluation, understanding these three-dimensional structural changes enables more informed interpretation of radiographs and oral examination findings, particularly when evaluating horses with suspected developmental or wear-related dental disease.
Read the full abstract on PubMed
Practical Takeaways
- •Understanding the 3D anatomy of incisor wear patterns can improve age estimation accuracy in clinical practice
- •Continued apical elongation compensates for occlusal wear, but this process has limits relevant to assessing dental health in older horses
- •Knowledge of age-related enamel and crown changes helps practitioners recognize normal wear patterns versus pathological dental disease
Key Findings
- •Three-dimensional μCT analysis revealed significant age-related morphological changes in the intraalveolar portion of equine incisors
- •Enamel cover on the occlusal surface decreases with age due to continuous wear, with compensatory tooth elongation occurring at the apical end
- •Quantitative morphometric measurements demonstrated measurable changes in enamel thickness and dental crown dimensions across different age groups