【摘要】 作者用离体四环素牙进行体外脱色试验,经光镜、荧光显微镜和扫描电镜进行脱色效果的评定。结论是 H₂O₂不能经牙釉质渗透到牙髓;也不能使牙本质荧光强度减弱。但临床病例追踪,经MINOLTA——100型便携式测色色差计定量测定分析,脱色治疗前后相比,脱色效果肯定（P<0.01）;其原因可能是牙釉质脱水后呈白垩色,使已着色的牙本质不反映或反映度降低所致。临床和组织学检查结果还表明:H₂O₂外脱色治疗对牙髓无不良副作用,临床应用安全;内脱色治疗因需作根管治疗,临床不宜推广。更多还原

【Abstract】 The bleaching test of tetracycline-stained teeth has been carried out in vitro.The resultswere estimated through observations of light microscope,fluorescence microscope and scaningelectron microscope.The conclusion was that hydrogen peroxide（H₂O₂）could not penetratethrough the enamel to the pulp,neither could weaken the intensity of fluorescencc of thedentine,However,the clinically tracing study showed that there was significant difference（P〈0.01）before and after bleaching treatment on the basis of quantitative measurementsof MINOLTA-100 Portable Color Difference Meter.The above different results suggested thatthe enam（?）l might bceome chalky after dehydration and the chalky enamel completely orpartially shut out the reflection of the tetracycline stained dentine.Futhermore,the clini-cal and histological studies showed that there was no side effect on the pulp applying H₂O₂as an outward surface bleaching agent clinically but it was inadvisable as an inward surfacebleaching agent because the root canal therapy was necessarily needed before the operation.更多还原