Richardson G, Russell K A
Dalhousie University, Halifax.
J Can Dent Assoc. 2000 Oct;66(9):497-501.
As impacted permanent maxillary cuspids occur in 1-2% of the population, the general dentist should know the signs and symptoms of this condition and the interceptive treatment. Features of buccal or palatal cuspid impaction include lack of canine bulges in the buccal sulcus indicating a lingual eruption path and possible impaction; lack of symmetry between the exfoliation and eruption of cuspids that may indicate palatal or lingual impaction; and abnormal mesiodistal location and angulation of the developing maxillary permanent cuspids on radiographs. Diagnosis of impacted cuspid teeth at age 8-10 years can significantly reduce serious ramifications, including surgical exposure and orthodontic alignment as well as root resorption of the lateral incisors. In specific cases, extraction of the primary maxillary cuspids can prevent impaction of the permanent maxillary cuspids and additional sequelae.
由于上颌恒尖牙阻生在1%至2%的人群中出现，普通牙医应了解这种情况的体征和症状以及阻断性治疗方法。颊侧或腭侧尖牙阻生的特征包括颊沟处缺乏尖牙隆起，表明其舌侧萌出路径及可能的阻生；尖牙脱落与萌出之间缺乏对称性，这可能表明腭侧或舌侧阻生；以及在X线片上发育中的上颌恒尖牙近远中位置和角度异常。在8至10岁时诊断出阻生尖牙可显著减少严重后果，包括手术暴露、正畸排齐以及侧切牙根吸收。在特定情况下，拔除上颌乳尖牙可预防上颌恒尖牙阻生及其他后遗症。
