1、Dental Equipment,演讲者：孙宗亮PPT制作及资料：秦辰燕 蔡芸芸 张彬,牙科椅,痰盂缸,器械盘,三用喷枪 牙钻,Abstract,Parts of Dental Equipment NEW Dental Equipment Self Delivery Cart UNIT Handpiece Dental drill,Parts of Dental Equipment,cotton forceps（棉钳）,Endodontic-Syringes牙髓注射器,Diagnostic Hand Instrument,Shadowless lamp无影灯,NEW Dental Equipm
2、ent Self Delivery Cart UNIT Handpiece,Basic disposition 3-way syringe Saliva ejector Clean water system Piezo Ultrasonic Scaler Led curing light,Dental drill,A dental drill (or dentists drill) is a small, high-speed drill used in dentistry to remove decayed tooth(龋齿) material prior to the insertion
3、of a dental filling. They are often made of steel with a tungsten carbide(硬质合金) coating, or of tungsten carbide entirely. The bur may also have a diamond coating.,Contents,History Principle Speed Other uses,History,Modern replica of the dental drills uncovered at Mehrgarh(梅赫爾格爾) (7000-5000 BCE). Thi
4、s earliest form of dentistry involved curing tooth related disorders with bow drills-operated, perhaps, by skilled bead craftsmen. In 1864, British dentist George Fellows Harrington invented a clockwork dental drill named Erado. The device was much faster than earlier drills,The modern incarnation o
5、f the dental drill is the air turbine(涡轮) handpiece, developed by John Patrick Walsh (later knighted) and members of the staff of the Dominion Physical Laboratory (DPL) Wellington , New Zealand.,Speed,Most air driven Hi-Speed Handpieces run at 380-450K RPM with no load, and under load the cutting sp
6、eed drops to around 20K rpm,Principle（air driven Hi-Speed Handpieces ）,气蜗流牙钻车头柄壳体内有两根管子，一路进气，一路进水，要排出的气体就从壳体的空隙中出来；车头内部有风轮，轴承，轧头，进气管路，排气管路，冷却水管等组成，压缩空气有进气管路进入车头后推动风轮转动，然后从排气路逸出车头外，轧头装在风轮之间，夹持车针随风轮一起旋转。车头下端的两个孔是喷射冷却水的，以防高速切削时烧灼牙齿，为了能更好地达到冷却目的，要求从喷水孔喷射出的水汇聚于车头的端点。,Other uses,Dental drills and drill bits are commonly used by jewellers and hobbyists for high-precision (高精度)drilling work.,Reference,http:/en .wikikipedia . org / wiki / Dental drill http:/ http:/ You,
