Figure 6
From: Three-dimensional anatomy of equine incisors: tooth length, enamel cover and age related changes
Boxplots of the dental root length of erupted upper and lower jaw incisors. Tooth age assigned to the root length. Box: interquartile range (25%, 75%), horizontal line: median, center point: mean, whiskers: range (5%, 95%), stars: minimum and maximum. The dental root length increases in time. Teeth older than 15 years p.e. show a significant longer root than younger teeth (p = 5.4 × 10-13 upper jaw, p = 2.4 × 10-12 lower jaw).