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| Tooth ankylosis ： ウィキペディア英語版 |
Tooth ankylosis
Tooth ankylosis refers to a fusion (ankylosis) of teeth to bone. The condition is diagnosed with radiographs (X-rays), which show loss of the periodontal ligament space and blending of the root with the bone. Clinically the tooth sounds solid when percussed (tapped) compared to the dull, cushioned sound from normal teeth. Ankylosis of teeth is uncommon, more so in deciduous teeth than permanent teeth.〔
==Decidious (baby) teeth==
Ankylosis of deciduous teeth ("submerged teeth") may rarely occur. The most commonly affected tooth is the mandibular (lower) second decidious molar. Partial root resorption first occurs and then the tooth fuses to the bone. This prevents normal exfoliation of the decidious tooth and typically causes impaction of the permanent successor tooth. As growth of the alveolar bone continues and the adjacent permanent teeth erupt, the ankylosed decidious tooth appears to submerge into the bone, although in reality it has not changed position. Treatment is by extraction of the involved tooth, to prevent malocclusion, periodontal disturbance or dental caries.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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