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Ga Ga

Ga Ga

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Fused teeth definition

2004年10月05日
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Fused Teeth-Two teeth united during development by the union of their tooth germs; the teeth may be joined by the enamel of their crowns, by their root dentin, or by both. Basically, fusion is the union of two dental organs which form a single tooth. The size of the joined teeth usually depends upon the stage of development at which fusion occurred. If fusion occurred early in development of the primary teeth, the fused teeth may appear normal in size or only slightly larger than a normal-sized tooth. It fusion occurred late in development, the fused teeth can appear to be about twice the size of normal teeth. Fusion in primary teeth does not necessarily mean the permanent teeth will also develop in this manner. From what you describe, it sounds as if the primary incisors (central and lateral) might have fused. If this is the case, there should not be much concern as the lower primary incisors are generally lost in close proximity to each other. Before your child reaches the average age of exfoliation of the primary teeth (about 6 years old), a radiograph of the area should be taken to determine development of the permanent teeth underneath the fused teeth. If the fused teeth are blocking one of the permanent teeth fro m eruption, extraction of the fused tooth (or teeth) may be necessary. The radiograph will also show the condition of the permanent teeth. At this point, there is no cause to worry or obtain special treatment of the fused teeth, except to have a dentist do an examination to determine that this is indeed the condition. Otherwise, continue to practice good oral hygiene, including flossing where possible. In the primary dentition, the frequency of gemination or fusion is about 2.5%. If it occurs in the primary teeth, it is more likely to occur in the permanent teeth. Technically, fusion is different from gemination. Fusion is the joining of two teeth by the pulp tissue and the dentin. The detin is the layer underneath the enamel. Enamel is the outer layer of tooth structure. This larger tooth may originate from two tooth germs. If one of the tooth germs was supernumerary (i.e. extra), the number of teeth in the arch may be normal. If two regular tooth germs fused, the number of teeth in the arch will be reduced by one. Gemination is the budding of a second tooth from one tooth germ. Accordingly, the number of teeth in the arch is normal if gemination occurs. If a deep groove is present, this tooth may be particularly susceptible to decay. Placement of a sealant would be prudent to prevent cavity formation. Distinguishing fusion and gemination can sometimes be difficult. A radiograph would be helpful in determining a diagnosis.