Rehrl Sabine, Schulte Wiebke, Staszyk Carsten, Lischer Christoph
Equine Clinic: Surgery and Radiology, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany.
Tierärztliche Klinik für Pferde am Sorpesee, Sundern-Stemel, Germany.
Equine Vet J. 2023 May;55(3):419-425. doi: 10.1111/evj.13591. Epub 2022 Jul 13.
Equine odontoclastic tooth resorption and hypercementosis (EOTRH) is a destructive, painful and underdiagnosed dental disorder. Radiography is necessary to fully assess the disease as early stages occur on clinically normal teeth.
To investigate the distribution pattern of appearance of EOTRH within the incisor arcade. In particular, we aimed to determine the influence of tooth position and horse age on the severity of EOTRH as well as on the frequency of the individual severity stages.
Retrospective cross-sectional radiographic case study.
Digital radiographs of 142 horses (10 years and older) presented for routine dental examination at our Equine Hospital were obtained and evaluated for changes related to EOTRH. Radiological findings were classified in terms of EOTRH severity, and each tooth was evaluated individually (tooth stage).
The tooth stages of EOTRH showed a bilateral symmetrical distribution pattern over the entire incisor arcade. There was a significant positive correlation between age and tooth stages (p < 0.001, rho = 0.48, 95% CI 0.43-0.51), and the frequency of higher tooth stages increased from central incisors to middle and corner incisors.
Individual head anatomy in some male horses lead to superimposition of the lower jaw corner incisors and canine teeth. The radiographic technique proved difficult in smaller and uncooperative horses. Differentiating between mild pathological signs of EOTRH and age-related radiological changes was not possible in all cases.
These results reconfirm an age-correlated progression of EOTRH. EOTRH affects the incisor arcade in a bilaterally symmetrical pattern with the corner incisors being the most severely affected.
马牙质吸收与牙骨质增生（EOTRH）是一种具有破坏性、疼痛性且诊断不足的牙齿疾病。由于早期病变发生在临床外观正常的牙齿上，因此需要进行放射成像以全面评估该疾病。
研究EOTRH在切牙弓内的出现分布模式。具体而言，我们旨在确定牙齿位置和马的年龄对EOTRH严重程度以及各个严重程度阶段频率的影响。
回顾性横断面放射成像病例研究。
获取了在我们的马医院接受常规牙齿检查的142匹10岁及以上马匹的数字放射照片，并对与EOTRH相关的变化进行评估。根据EOTRH严重程度对放射学结果进行分类，并对每颗牙齿进行单独评估（牙齿阶段）。
EOTRH的牙齿阶段在整个切牙弓上呈现双侧对称分布模式。年龄与牙齿阶段之间存在显著正相关（p < 0.001，rho = 0.48，95% CI 0.43 - 0.51），并且较高牙齿阶段的频率从中央切牙到中间切牙和隅切牙逐渐增加。
一些雄马的个体头部解剖结构导致下颌隅切牙和犬齿重叠。对于体型较小且不配合的马匹，放射成像技术实施困难。在所有情况下都无法区分EOTRH的轻度病理体征与年龄相关的放射学变化。
这些结果再次证实了EOTRH与年龄相关的进展情况。EOTRH以双侧对称模式影响切牙弓，其中隅切牙受影响最为严重。
