03/10/2024
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Mind the gap! 🔍🦷
A diastema (singular) or diastemata (plural) refers to an abnormal space between teeth. Normally, horses have six cheek teeth in each dental arcade, tightly positioned to function as a single grinding unit. However, if a gap exists between these teeth then food can become trapped. A UK study indicated that 49.9% of horses of all ages are affected. The prevalence of diastemata increases in horses over the age of 15.
Diastemata are classified into two types:
Primary Diastemata
These are developmental in nature and can occur due to improper rostral-caudal angulation, dental buds that are too far apart, or teeth that are developmentally displaced or rotated.
Secondary Diastemata
These are acquired and may result from tooth displacement, pressure from occlusal overgrowths, drifting teeth following extraction, or the natural tapering of teeth with age, leading to senile diastemata.
There are two types of diastemata based on the gap's shape:
Open Diastema: The gap is the same width from top to bottom.
Valve Diastema: The top of the gap is narrower than the bottom, which can cause food impaction.
If food becomes impacted then bacteria can proliferate leading to gingivitis, and the breakdown of periodontal ligaments causing periodontal disease. Periodontal disease is considered the most painful condition in the horses mouth. Signs of periodontal disease includes quidding, halitosis, and in severe cases, weight loss.
The treatment of diastemata should be approached on a case-by-case basis. First steps include clearing any impacted food and good quality dentistry. In some cases, further intervention and referral to a veterinary surgeon may be necessary. More advanced treatments involve using materials to bridge the diastemata, preventing food from becoming trapped and promoting gum healing. In cases of valve diastemata, mechanically widening the top of the gap can facilitate less trapping of food material, which can be an effective solution. In some severe cases of displaced teeth, extraction may also be an option. Additionally, dietary adjustments may be required.
Every diastema is individual, therefore it’s important to discuss with your EDT regarding long term management.