A Retrospective Observational Cohort Study on the Expiration of Maxillary Cheek Teeth Infundibula in 217 Horses.

This research involved studying the wear patterns of cheek teeth in horses, particularly the infundibula, to determine their age. The findings suggest that infundibula attrition could be a result of various factors and could become a helpful tool for aging horses.

Study Overview

In the first section of the research, the scientists hinged on the historical precedence of determining a horse’s age by examining its teeth – a technic that has been in use since 600 BC. Traditionally, incisor wear patterns were mostly considered for this purpose. However, this study brought to the forefront a hitherto less-frequently used method of determining a horse’s age by observing the expiration (wear and tear) of the infundibula (natural deep grooves or depressions) in the maxillary cheek teeth.

• The research was a retrospective observational cohort study involving 217 horses aged between 16 and 35 years.
• The objective was to explore if the degree of infundibula attrition could aid in accurately determining advanced age in horses.

Key Findings

The study’s results indicated a potential correlation between the attrition (wearing out) of the infundibula and a combination of factors:

• Eruption time: The period it takes for a tooth to break through the gums, might impact the infundibulum’s wear.
• Length of the tooth/infundibulum: The size of the tooth in general and the infundibulum in particular could affect how quickly it wears out.
• Forces placed on the tooth: The manner and intensity with which a horse uses its teeth likely influence the rate of attrition.
• Presence of enamel or cemental hypoplasia: Hypoplasia is a condition where the enamel or cementum (calcified substance covering the root of a tooth) is underdeveloped or thin. If existing, it could hasten the wearing out of infundibula.

Implications and Future Directions

The study suggests that observing cheek tooth infundibular wear can become a practical tool for aging horses in real-world conditions, instead of relying solely on incisor wear patterns. Further prospective studies are needed to corroborate these findings and to develop a more refined method for determining a horse’s age based on cheek teeth infundibula’s expiration.