Schematic Drawing 

 of Central Incisor 



Appearance of the table 

 (occlusal) surfaces at different 

 stages of wear. 



1 — shortly after eruption 

 its breadth (transverse, long 

 diameter) marked by a-b, its 

 thickness (short diameter) c-d. 



2 — shows the table surface 

 as it appears at the age of six 

 years, the breadth, a-b, begins 

 to decrease, and the thickness, 

 c-d, increases slightly; the tooth 

 appears oval. 



3 — shows a round surface of 

 nine to twelve years. The two 

 diameters become equal. 



4 — shows a triangular surface 

 of fourteen to seventeen years. 

 The long diameter, c-d, in the 

 labiolingual direction. 



5 — shows surface of animal over 

 twenty in which breadth, a-b, 

 measures only half as much as 

 thickness, c-d. 



6 — depicts exposed incisor. 



Figure 8 — A schcnnntk drawing of the central incisor of the horse at various 

 different ages. (Adapted from the "Official Guide for Determining the Age of the 

 Horse," published by the American Association of Equine Practitioners.) 



Figure 9 {pages 11-19 — 11-31) — Lquiiie incisors at various ages. (Scanned 

 from the "Official Guide for Determing the Age of the Horse," published by the 

 American Association of Equine Practitioners.) 



11-18 



