Carmalt James L, Townsend Hugh G G, Allen Andrew L
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S1N 5B4, Canada.
J Am Vet Med Assoc. 2003 Sep 1;223(5):666-9. doi: 10.2460/javma.2003.223.666.
To evaluate the effect of dental floating on the position of the mandible relative to the maxilla (a measure of rostrocaudal mobility [RCM] of the mandible) during extension and flexion of the head of horses.
Randomized controlled blinded trial.
59 horses housed in 1 barn.
Horses were formally randomized into a treatment (n = 33) or control (26) group. All horses were sedated, and the distance between rostral portions of the upper and lower incisor arcades were determined with the head fully extended and flexed at the poll (the difference in measurements represented the RCM of the mandible). The oral cavity was examined. For the treatment group, dental floating was performed, and the incisor arcade measurements were repeated.
Dental correction resulted in a significant increase in RCM of the mandible in 31 of 33 horses. The mobility was greater in heavy horses than that detected in other breed classifications. Age and number of dental lesions did not significantly affect mobility before or after dental floating.
Dental floating increased RCM of the mandible, but measurement of this variable was not an indicator of the number or extent of dental lesions, and no specific dental abnormality appeared to significantly affect RCM of the mandible in horses. In horses, measurement of RCM of the mandible can be used as a guide to determine whether dental correction is necessary; after dental floating, it can be used to ensure that irregularities of the occlusal surface have been corrected.
评估牙齿打磨对马头部伸展和屈曲过程中下颌骨相对于上颌骨位置的影响（下颌骨前后移动性[RCM]的一种测量方法）。
随机对照双盲试验。
饲养在1个马厩中的59匹马。
将马正式随机分为治疗组（n = 33）或对照组（26匹）。所有马均给予镇静，在头部完全伸展和在枕部屈曲时测定上下切牙弓前端部分之间的距离（测量值之差代表下颌骨的RCM）。检查口腔。对治疗组进行牙齿打磨，并重复切牙弓测量。
在33匹马中的31匹马中，牙齿矫正导致下颌骨的RCM显著增加。重型马的移动性比其他品种分类中的马更大。牙齿病变的数量和年龄在牙齿打磨前后对移动性均无显著影响。
牙齿打磨增加了下颌骨的RCM，但该变量的测量并非牙齿病变数量或程度的指标，且似乎没有特定的牙齿异常会显著影响马下颌骨的RCM。在马中，下颌骨RCM的测量可作为确定是否需要进行牙齿矫正的指导；牙齿打磨后，可用于确保咬合面的不规则性已得到矫正。
