髓室内漂白对狗牙颈部牙周组织的影响

目的研究２种髓室内漂白法对狗牙颈部牙周组织的影响。方法建立内漂白的实验动物模型，制备病理切片，光镜观察狗牙颈部牙周组织的组织学改变。结果髓室内漂白１年后，热漂白组镜下表现为（１）牙骨质或牙本质吸收；（２）骨性粘连；（３）吸收区大量炎细胞浸润。诊间漂白组镜下表现为（１）牙槽骨局限性吸收；（２）牙骨质陷窝状吸收。结论对含３０％过氧化氢的漂白剂行髓室内漂白，无论加热与否，均可导致狗牙颈部外吸收

The effect of intracoronal bleaching on cervical periodontium of dogs

OBJECTIVE:To study the effects of two intracoronal bleaching techniques on dog's cervical periodontium.METHODS: The experimental animal modles of intracoronal bleaching were established and pathological slides were made. The histological changes of dogs' periodontium were examined by means of light micro-scope. RESULTS: A year following intracoronal bleaching,the group received thermocatalytic bleaching showed:(1)resorption of cementum or dentine;(2)ankylosis,(3)infiltratin of substantial inflamatory cells into resorption areas.The group received walking bleaching showed:(1)localized resorption of alveolar bone;(2)lacuna-shaped resorption of cementum. CONCLUSION: Whether heated or not,intracoronal bleaching with bleaching with bleaching agent including 30% hydrogen peroxide may innitiate external cervical resorption of dog's teeth.