. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . LIANCES instrument, it will be seen that the divisions of this short scale (the Vernier) equal 9divisions on the main the zero divisions onthe main scale and the Ver-nier are together, the instru-ment is at rest and is notcapable of registering ameasurement. Now, movethe first division on the Ver-nier in contact with the firstdivision on the main scaleand the instrument will reg-ister millimeter; movethe second divisions togetherand millimeter are regis-tered; the third
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . LIANCES instrument, it will be seen that the divisions of this short scale (the Vernier) equal 9divisions on the main the zero divisions onthe main scale and the Ver-nier are together, the instru-ment is at rest and is notcapable of registering ameasurement. Now, movethe first division on the Ver-nier in contact with the firstdivision on the main scaleand the instrument will reg-ister millimeter; movethe second divisions togetherand millimeter are regis-tered; the third divisionsgiving millimeter, thefourth divisions giving ,^the fifth divisions giving ,and thus continuing until imillimeter is registered. TheBoley gauge is valuablefor measuring instrumentblades, plugger points, drills,burs, differences in the meas-urement of teeth of the samedenomination in the mouth,in comparing measurements,in restoring angles of teeth Fig. 60.—Boley millimeter gauge. , , , ., i. m gold-buildmg operations,in selecting artificial teeth, and many other cases arising in. INSTRUMENT NOMENCLATURE 55 dental practice. It should be in the hands of every dentalstudent and practitioner (Fig. 60). Instruments are known as Long-handle Instruments ifthe handle, shank and blade are all made from one piece ofsteel; if the shank and blade or nib are separate from thehandle and intended to be screwed into it, the instrumentis known as a Cone-socket Instrument. Examples of longhandle instruments are shown in Fig. 71, while the Black setof pluggers seen in Fig. 86 are of the cone-socket \ advantage in the cone-socket instrument is that, if theworking part is broken, it may be replaced at less expense; thedisadvantage is its tendency to loosen at the joint. Studentsshould see that all cone-socket instruments are screwed tight intothe handles before using. Bevels.—The blades of some cutting instruments, suchas chisels, are beveled on only one side, while
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