Anatomy of equine incisors: Pulp horns and subocclusal dentine thickness.
Authors: Englisch L M, Rott P, Lüpke M, Seifert H, Staszyk C
Journal: Equine veterinary journal
Summary
# Editorial Summary: Equine Incisor Anatomy and Pulp Protection Corrective incisor reduction is routine in equine dentistry, yet practitioners have lacked anatomical data specific to incisors to guide safe working depths—a gap this 2018 study addressed by examining pulp morphology and protective dentine thickness. Using high-resolution CT scanning of incisor arcades from 13 cadaver horses, Englisch and colleagues reconstructed three-dimensional models to map pulp horn positions and measure the critical distances between pulp tips and both the occlusal and labial surfaces. Subocclusal dentine thickness varied considerably (1.5–11.7 mm in upper incisors; 0.7–6.7 mm in lower), decreased with advancing age, whilst the distance to the labial aspect ranged from 3.5–9.0 mm in upper teeth and 3.8–8.1 mm in lower teeth, increasing with age. Despite mean subocclusal thickness exceeding 4.1 mm, the finding that some incisors present less than 1 mm of protective dentine has significant implications: farriers and veterinary surgeons performing incisor reduction must exercise considerable caution, as aggressive reduction in susceptible individuals risks iatrogenic pulp exposure and subsequent endodontic complications. These anatomical parameters should inform clinical decision-making about reduction depth, particularly in older horses where labial dentine is relatively thicker but occlusal protection is compromised.
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Practical Takeaways
- •Exercise extreme caution when performing incisor reduction procedures; always verify individual tooth anatomy before grinding, as some horses have critically thin dentine (< 1 mm) overlying pulp tissue
- •Age-related changes in pulp anatomy mean younger horses typically have thicker subocclusal dentine but shallower labial distances to pulp; adjust reduction strategy accordingly
- •Use advanced imaging (CT) preoperatively on high-risk cases to map pulp horn location and avoid iatrogenic pulpal exposure that can lead to endodontic infection and tooth loss
Key Findings
- •Subocclusal dentine thickness in upper incisors ranges from 1.5–11.7 mm and in lower incisors from 0.7–6.7 mm, decreasing with tooth age
- •Distance from pulp horns to labial surface ranges from 3.5–9.0 mm (upper) and 3.8–8.1 mm (lower), increasing with tooth age
- •Some incisors have less than 1 mm of subocclusal dentine thickness, creating significant risk of pulpal exposure during reduction procedures
- •Mean subocclusal dentine thickness exceeds 4.1 mm but individual variation is substantial, requiring careful case-by-case assessment