在矯正門診中經常會遇到小孩子,其門牙的外型會看起來怪怪的,家長會存在一個疑問?怎麼門牙的切端像一個鋸齒狀的樣子,這該怎麼辦呢?其實這是恆牙胚胎形成的外型, 漸漸成長萌發後,稱為發育葉(developmental lobes),像山字形,新萌出的恆門齒的切緣都會出現3個牙釉質(enamel)的圓形突起,稱為lobes(葉),其前端的突起稱為mammeloms(像乳頭的突起),關於mammelon的英文字義解釋如下:
Mammelons
Mammelons are usually found as three small bumps on the incisal edges of anterior teeth. They are the remnants of three lobes of formation of these teeth, the fourth lobe represented by the cingulum. Since this surface of the tooth is the first to wear away from attrition, mammelons may not visible on teeth of older people. Instead, the best chance to see this characteristic is soon after eruption of the tooth into the mouth.
Mammelons---rounded prominence (on incisal margins when they first erupt)
這個突起會隨著牙齒萌出於口腔中,經由漫長的磨耗後,慢慢切端會變平,也就是大家平常看到的平平的切端形狀,這就是牙體外形的改變
Winged Maxillary Central Incisors with Unusual Morphology: A Unique Presentation and Early Treatment
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