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牙脫位有何表現?

Posted By vickong pun     July 9, 2021    

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牙脫位有何表現?

  

牙脫位有何表現?

  牙脫位有何表現?牙脫位往往是外傷造成的,根據外傷程度不同.表現也不同。


(1)牙齒部分脫位:常有疼痛、松動和移位表現。

①脫出性脫位和側向性脫位.因患牙伸長而出現咬合障礙 x線片示牙根尖與牙槽窩的間隙明顯増寬。

②嵌入性脫位。牙齒向深部嵌入,臨床牙冠變短.其咬合面或 切緣低于正常牙。X線片示牙根尖與牙槽窩無明顯間隙.根尖周 膜間隙消失。

(2)牙齒完全脫位:可見牙齒完全離體或僅有少許軟組織相 連,牙槽窩內空虛.

(3)牙脫位並發症:牙齒脫位不論部分還是完全性者,均常伴 有牙靦撕裂和牙槽突骨折。牙齒脫位後,可以發生一些並發症.

①牙髓壞死。其發生率占牙脫位的52%,占嵌入性脫位的 96%.
②牙髓腔變窄或消失。發生舉占牙脫位的20%?25%,牙髓 腔內鈣化組織加速形成,是輕度牙脫位的反應,嚴重的牙脫位常導 致牙儲壞死。
③牙根外吸收。有人認爲壞死牙儲的存在能促使牙根的外吸 收.牙根吸收最早在受傷2個月後發生,此外約冇2%的病例並 發牙內吸收.
④邊緣性牙槽突吸收.嵌入性和脫出性脫位牙特別容易喪失 邊緣牙槽突.

     ★ 護牙知多d      

《什麼是嵌體?》

  

《何謂惡性淋巴瘤?》

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