髓室内漂白对狗牙颈部牙周组织的影响

The effect of intracoronal bleaching on cervical periodontium of dogs

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。

Objective To study the effects of two intracoronal bleaching techniques on dogs 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:①resorption of cementum or dentine;②ankylosis,③infiltration of substantial inflamatory cells into resorption areas.The group received walking bleaching showed:①localized resorption of alveolar bone;②lacuna shaped resorption of cementum. Conclusions Whether heated or not,intracoronal bleaching with bleaching agent including 30% hydrogen peroxide may innitiate external cervical resorption of dogsteeth.