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爲什麽患急性牙髓炎特別痛?

Posted By vickong pun     July 10, 2021    

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爲什麽患急性牙髓炎特別痛?

  爲什麽患急性牙髓炎特別痛?急性牙冊炎是口腔急症最常見的一種,俗話說“牙痛不算病. 痛起來真要命,多半所指的就是急性牙髓炎,可見劇烈疼痛是其 主要症狀。
仔細詢何病史,不難發現它的疼痛往往呈劇烈的自發 性疼痛,尤其是在夜間或臥位時疼痛越發嚴重,影響睡眠.患者坐 臥不安,甚至不能椎確定位,或有放射痛,感覺一側上下領牙齒均 痛,並放散到頭鞭和面部。
冷熱等刺激常能引起或加重疼痛。
關于急性牙炎導致劇烈疼痛的原因較複雜,包括外周和中樞的原因.爪從外周的原因分析.可分爲外源性因索和內源性因素 兩個方面。


(1)外源性因素:急性牙周炎時,由于血管通透性増加?血管內 的血漿蛋白和中性粒細胞等滲到組織中引起牙圈組織水腫?牙髓 腔內壓力増大.而牙髓腔是牙齒硬組織形成的一個密閉的腔隙,只 有針尖大小的根尖孔與根周組織相通,炎性滲出物無法及時排出’ 牙髓腔內壓力持續増髙?從而機械壓迫牙窗神經纖維産生劇烈疼 痛.這就是外源性因素所致。

(2)內源性因素:夜間臥位時.由于體位的改變.到達頭面部血 流R增加,牙窗腔壓力更高.故常見劇烈的夜間疼痛.不能人睡。
另一方面.滲出物中有化學遞質如5-羟色胺、組胺、緩激肽和前列 腺素等,這些炎症遞質姑引起疼痛的內源性因素?能使神經感受器 疼痛岡下降,敏感性増高,因而感覺疼痛特別劇烈。

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