發生於下顎左右兩側小臼齒附近的多生牙
正中門牙間的mesiodens
(FROM Indian Society of Pedodontics and Preventive Dentistry )
臨床上常見到中門牙間出現的一顆錐形牙,小小瘦瘦的,有些是高位,有些會埋伏,有些會擠壓上中門牙,形成外觀上不甚搭調的狀況,通常這種案例都是儘早處理拔除為宜,以避免牙列產生過度擁擠,甚至影響到日後恆牙的排列
The incidence of mesiodens in permanent dentition ranges from 0.15 to 3.8%(永久齒列的發生率), whereas in primary dentition it ranges from 0 to 1.9%(乳牙列的發生率)
不處理會產生一些併發症如擁擠(crowding),延遲萌牙(delayed eruption), 牙縫過大(diastema), 旋轉(rotations), 囊腫(cystic lesions), 鄰牙的吸收(resorptions of adjacent teeth)
最近在看電視,記得以前和黃西田一起主持的康弘先生,他本身就是一例mesiodens的案例,也就是俗稱兔寶寶牙,不過,最近,您看電視,康弘上排門牙的中間牙不見了,加上空間也關閉了,很可能不是透過矯正做的,而是以陶瓷牙來製作完成的
Supplemental mandibular central incisor
Indications for supernumerary removal
1. Delayed central incisor eruption
2. Altered eruption or displacement of incisors, diastema formation
3. Associated pathology
4. Orthodontic alignment of an incisor in close proximity to supernumerary is envisaged.
5. Compromises bone graft in cleft lip and palate cases.
6. Spontaneous eruption of supernumerary has occurred.
7. Predisposes the area to pericoronitis, gingivitis, periodontitis, abscess formation
The multidisciplinary management of median diastema
Two Cases with Supernumerary Teeth in Lower Incisor Region(日本東京齒科大學病例報告)(The Bulletin of Tokyo Dental College)
Supernumerary tooth: report of a case
Diagnosis and Management of Supernumerary Teeth
Supernumerary teeth at primary and permanent dentition
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