首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care o
A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care o
admin
2009-06-24
50
问题
A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care of them, pulled. For your teeth, proper oral care is as essential as anything else you do for your body and your generally health. Fortunately, if there is any damage to your teeth modern dentistry techniques make it easier, faster and less painful to get the problem fixed.
By definition, dentistry includes the study, diagnosis, treatment and the prevention of disease of the mouth, teeth, gum and jawbones. Today’s dentists use sophisticated equipment and pain-preventing medicines, but these have not always been around.
The earliest historical records of dentistry are from Egypt from around 3600 B.C. Aesculapius, a Greek physician who lived around 1250 BC, is credited with the idea of pulling disease teeth. Hippocrates, around 400 BC, wrote of applying ointments and using branding irons to treat disease of the mouth. Through the Middle Ages wealthy people were treated by physicians and surgeons, while poor people could look to the local barber to pull painful teeth.
Modern dentistry emerged with the release of Pierre Fauchard’s book The Surgeon Dentist, A Treatise on Teeth. Fauchard is considered the father of modern dentistry. Later, the first school devoted to teaching dentistry opened in Baltimore in the U.S.A. in 1840.
Green Vardiman Black invented a foot engine so dentists would have two free hands while using the dental drill. He also came up with the idea that gum disease was an infection caused by bacteria. This was later confirmed in 1960. An important contribution was made in 1944 when Dr. Horace Wells, a Connecticut dentist, first used nitrous oxide (laughing gas) as an oral anesthetic; today this method of administering anesthetic is employed for many dental and medical surgeries. The introduction of fluoride in toothpaste in the 1960s was a huge breakthrough; teenagers and adults today have a 50% better chance of not developing tooth decay.
The 1990s saw a change in thinking when it came to fillings for cavities in teeth. Since the early 1800s silver amalgam—a combination of silver, tin and mercury—has been the standard filling compound. But modern fears about mercury poisoning have led many people to have their amalgam fillings replaced with plastic polymer fillings. Besides not having any mercury, plastic polymers have an advantage over metal fillings because the color can be matched to the surroundings tooth and the material can be chemically bonded to the tooth.
Dentistry methods are sure to advance even more in the future. Things such as laser technology, which is used to eliminate diseased tissue or weld together damaged parts of teeth, will soon become a common practice in dentists’ offices. And computer-assisted technology is ushering in new advances in the area of tooth restoration. The primary goal of dentists is to develop early detection methods to prevent dental conditions from turning into dental problems.
Caring for your teeth properly will lessen the number of visits you make to the dentist. Brushing properly, flossing every day, getting a professionally cleaning every six months and maintaining a diet low in sugar can aid in keeping your teeth healthy. Your teeth will stay in your mouth if you take care of them.
选项
A、Proper dental hygiene.
B、Major events in the history of dentistry.
C、Great people who have been dentists.
D、Dentistry methods.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/PzTd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
WeatherMapAweathermapisanimportanttoolforgeographers.Asuccessionofthreeoffourmapspresentsacontinuouspi
WeatherMapAweathermapisanimportanttoolforgeographers.Asuccessionofthreeoffourmapspresentsacontinuouspi
TheSunDanceisconsideredbymanytobethemostspectacularritualoftheNorthAmericanPlainsIndians.
Humanfacialexpressiondifferfromthoseofanimalsinthedegreetowhichtheycanbedeliberatelycontrolledandmodified.
Stressleveliscloselyrelatedto______.The1,031adultswereinterviewed______.
TheauthorofthepassagecouldnotgotosleeppartlybecauseTheauthorbrushedhisteethoverandover
ForestsforCitiesYouarestandinginabeautifulforestinJapan.Theairiscleanandsmellslikeplantsandflowers.Ther
InterviewwithAllanGray1.Iwasworkingforamultinationalcompanyintheearly1980s,andmybrotheraskedmeifIwasi
InterviewwithAllanGray1.Iwasworkingforamultinationalcompanyintheearly1980s,andmybrotheraskedmeifIwasi
随机试题
在一定范围内可以用增加CO2浓度的方法增强光合作用。()
A.肾小球基膜多种免疫复合物沉积B.肾脏淀粉样变性C.肾小管酸中毒D.局灶节段坏死性肾小球肾炎E.小动脉内皮细胞增生类风湿关节炎最终导致的主要肾脏病变为
某厂房采用C20钢筋混凝土独立基础,锥形基础基底面为正方形,边长B=2.5m,基础有效高度h0=0.46m;作用在基础上的荷载效应标准组合为轴心荷载Nk=556kN,弯矩Mk=80kN.m;正方形柱截面边长b=0.4m。若按《建筑地基基础设计规范》(G
(2011年)燃煤锅炉的燃烧过程中S的转化率一般为85%,如燃烧1kg含硫量2.1%的动力煤,在α=1.8时产生实际干烟气量为14.5m3(标态),目前国家排放标准为900mg/m3。试估算达标排放所需的脱硫效率为:
(2008年)图5—48所示为三角形单元体,已知ab、ca两斜面上的正应力为σ,剪应力为零。在竖直面bc上有()。
下列房地产交易行为中,应当计算缴纳土地增值税的是()。
下面对骨骼肌的叙述不正确的是()。
埃赫那吞改革的主要内容和失败的原因。
约翰逊称她于1907年创办的费尔霍普学校为()。
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
最新回复
(
0
)