问题 单项选择题

8岁儿童上前牙外伤冠折未露髓应采用哪种治疗方法()

A.直接盖髓术

B.间接盖髓术

C.活髓切断术

D.根尖诱导成形术

E.根管治疗术

答案

参考答案:B

解析:年轻恒牙牙本质小管粗大,冠折暴露牙本质,易致牙髓感染,故近期就诊者,应行间接盖髓术保护牙髓。牙冠折断露髓后,年轻恒牙的牙髓组织抵抗力较强,若露髓孔不大且外伤时间短可作直接盖髓治疗。但临床经验表明,直接盖髓不易成功,可能和牙齿震荡和牙髓损伤的程度有关。因此可在局麻下做活髓切断术,如外伤时间较长,有牙髓炎症甚至有牙髓坏死症状时应及时做去髓治疗。年轻恒牙去根髓时注意不要损伤牙 * * ,可做根尖诱导成形术。13岁儿童上前牙牙根发育完成,冠折露髓应行根管治疗术,保存患牙。

问答题
阅读理解

阅读理解。

     Three more cattle farms in Andong,North Gyeongsang Province,were found to have been

infected with the deadly foot-and-mouth disease,Nov. 2 2010,Thursday. People fear that livestock

farms in other parts of the country could be hit by the virus soon.

     On Monday,the disease was first detected on two pig farms in Andong,about half a year after

the last disease broke out in Korea. A cattle farm in the area also fell victim to the animal disease

the following day.  

     The Ministry for Food,Agriculture,Forestry and Fisheries made sure that three more cases of

foot-and-mouth disease appeared on Thursday and decided to kill all the animals at the farms and

others at nearby places to stop the spread of the virus to other regions. Over 800 cows and pigs

within a 500 meter range of the infected farms were killed and buried underground.  

     "Three suspected cases were reported Wednesday,near the pig farms where the first outbreak

was reported. The laboratory tests today showed that all three cattle farms were infected with the

disease," a ministry official said. Two newly infected cattle farms were less than 4 kilometers away

from the two pig farms,while the third one was only 2. 5 kilometers away.  

     The ministry also said another cattle farm in Andong reported suspected cases of foot-and-mouth

disease on its livestock Thursday,indicating the disease will likely continue to spread across the city

and possibly beyond.  

     The government has culled more than 33,000 animals near the affected farms Monday alone under

its disease prevention program. Additionally,all 84 livestock markets across the nation were closed

Wednesday for a period to prevent spread of the disease.

     No suspected cases have been reported outside of Andong,but the government Thursday decided

to destroy an additional 22,000 pigs at two farms in Boryeong,South Chungcheong Province.

1. Last time foot and mouth disease          .

A. broke out in North cattle farms

B. was controlled as soon as possible

C. happened in June,2010

D. destroyed almost all cattle in cattle farms

2. How did the government deal with the disease?

A. The government controlled only the two farms.

B. The government had more animals killed.

C. The government tried to cure the sick animals.

D. The government hated to kill animals.

3. The underlined word "culled" has the same meaning as          .

A. treated

B. killed

C. bought

D. sold

4. From the last paragraph we can know that          .

A. 22,000 pigs have been infected with the disease

B. 22,000 pigs will be moved to other farms

C. Boryeong is also an infected area

D. 22,000 pigs will go down to their death

5. In which part of a newspaper can you most probably read the passage?

A. Today's News  

B. History and Culture

C. Entertainment

D. Science