畸形牙临床颇多。多见冠部畸形和根部畸形,但畸形牙中牙罕见。国内文献报道4例为侧切牙3例,左侧下颌第5双尖牙1例,目前磨牙畸形牙中牙未见报道,我科门诊于1982年7月发现1例为右侧下颌第八磨牙畸形牙中牙。现报告如下:患者李×,女性,26岁,因牙痛,食物塞牙就诊。检查:(?)无龋、两牙之间食物嵌塞,垂直阻生,牙周袋深,松动(-),探诊舌侧有牙感,扪诊舌侧彭隆。建议拔牙,本人同意。用2%奴夫卡因右下颌传导麻醉下拔除(?),牙拔除后发现,牙体完整,位于(?)舌侧颈部下端有一个完整的小牙牙冠相接大牙的牙体上,牙根分叉小,颊侧融合根。 (附图) Deformity of many clinics. Common crown deformities and root deformities, but the tooth teeth rare. 4 cases reported in the country as lateral incisors in 3 cases, the left 5 cases of 5 pairs of canine teeth, the current tooth has not been reported in molars deformity, our clinic in July 1982 found 1 case of right mandibular eighth molar Teeth teeth. The report is as follows: Patient Lee ×, female, 26 years old, due to toothache, food Seals treatment. Check: (?) Caries-free, food impaction between the two teeth, vertical occlusion, periodontal pocket deep, loose (-), probing the lingual side of the tooth, palpable lingual Peng Long. Proposed tooth extraction, I agree. With 2% Nuvucaine right mandibular conduction anesthesia under the removal of (?), Dental extraction found that the integrity of the teeth, located in the (?) Lingual neck at the bottom of a complete small tooth crowns large teeth on the teeth, Root bifurcation small, buccal fusion root. (With photos)