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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Vertical root fracture ： ウィキペディア英語版 Vertical root fracture Vertical root fractures are a type of fracture of a tooth. They can be characterized by an incomplete or complete fracture line that extends through the long axis of the root toward the apex. Vertical root fractures are between 2 and 5 percent of crown/root fractures. The greatest incidence occurs in endodontically treated teeth and in patients older than 40 years of age. The occurrence of a complete vertical root fracture is often catastrophic for the individual tooth as tooth extraction is usually the only reasonable treatment. Vertical root fracture is more likely where teeth have undergone extensive prior treatment. It is thought that excessive removal of dentine during procedures such as root canal treatment weakens the tooth. For this reason excessive canal shaping is to be avoided. Fracturing may be caused by excessive forces placed on the tooth, such as during compaction of gutta-percha during the obturation phase of endodontics. Trauma can also cause crack formation. ==Symptoms== Symptoms include: Short duration pain on biting, sensitivity to temperature change. Fracture lines may be visibly evident. Transillumination may reveal unseen fractures. Radiographic changes such as radiolucencies in the region of the fracture may be seen. 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「Vertical root fracture」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.