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Tooth mobility is the medical term for loose teeth. ==Classification== Mobility is graded clinically by applying pressure with the ends of 2 metal instruments (e.g. dental mirrors) and trying to rock a tooth gently in a bucco-lingual direction (towards the tongue and outwards again). Using the fingers is not reliable as they are too compressible and will not detect small increases in movement. The location of the fulcrum may be of interest in dental trauma. Teeth which are mobile about a fulcrum half way along their root likely have a fractured root.〔 Normal, physiologic tooth mobility of about 0.25 mm is present in health. This is because the tooth is not fused to the bones of the jaws, but is connected to the sockets by the periodontal ligament. This slight mobility is to accommodate forces on the teeth during chewing without damaging them. Milk (deciduous) teeth also become looser naturally just before their exfoliation.〔 This is caused by gradual resorption of their roots, stimulated by the developing permanent tooth underneath. Abnormal, pathologic tooth mobility occurs when the attachment of the peridontal ligament to the tooth is reduced (attachment loss, see diagram), or if the periodontal ligament is inflamed.〔 Generally, the degree of mobility is inversely related to the amount of bone and periodontal ligament support left. Classification by Preston D. Miller * Class 1: < 1 mm(Horizontal) * Class 2: >1 mm(Horizontal) * Class 3: > 1 mm (Horizontal+vertical mobility) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tooth mobility」の詳細全文を読む スポンサード リンク
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