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爲什麽根尖周炎時患牙有伸長感?

Posted By vickong pun     July 8, 2021    

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爲什麽根尖周炎時患牙有伸長感?

  爲什麽根尖周炎時患牙有伸長感?有些患者感覺牙齒伸長了,咬合時疼痛,不敢咀嚼而影響進 食.牙痛時出現患牙伸長感通常由兩種情況引起,一是急性根尖 周炎,一是咬合創傷或牙齒外傷。臨床上以前者爲多見。急性根尖周炎初期,根尖部牙周膜有急性炎症表現,爲牙周膜 充血,血管擴張,血漿滲出引起的組織水腫.由于上述炎症變化, 臨床上表現爲初起時患牙出現疼痛,以後逐漸加重,此時將患牙咬 著時疼痛反可暫時緩解,這是因咬合壓力將充血的血管內血液擠 壓出去之故。當炎症繼續加重時,則根尖周部充血水腫加重?咬患 牙時反而更痛.病人自覺牙齒伸長。隨著根尖部炎症滲出物逐漸 増多,患牙浮出和伸長的感覺更爲明顯,輕輕叩擊患牙和用患牙咀 嚼時都會引起疼痛。由于牙周膜神經受到刺激,表現出來的疼痛是自發性、持續 性,且疼痛範圍局限,也不擴散到鄰近或對領牙齒上,所以患者能 明確指出患牙。醫生在檢査時用器械叩擊患牙時有疼痛.用手指 扪壓患牙根尖區黏膜時有壓痛感。另外,咬合創傷和牙齒外傷也可引起牙齒伸長感。由不正常 的咬合接觸或咀嚼而造成牙周組織創傷及牙外傷時,使牙齒受到 震蕩,引起牙周膜的輕度損傷,如遭受外力碰傷或驟然咀嘲硬物, 患牙也可有伸長不適感、輕微的松動和叩痛.

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