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Mark II Instruction Manual - Whip Mix

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A. Facebow Transfer<br />

If the facebow/earbow is used as a<br />

face bow (the posterior reference points<br />

are oriented to the posterior reference<br />

points marked on the side of the patient’s<br />

face in the area of the terminal<br />

hinge axis) the facebow will be attached<br />

to the articulator by indexing the posterior<br />

reference pins into the facebow<br />

indexes on the lateral aspects of the<br />

condyles (fig. 50).<br />

A. Earbow Transfer<br />

If the facebow/earbow is used as an earbow<br />

the nylon earplugs are removed for<br />

attachment of the bow to the articulator<br />

and the posterior reference pins are<br />

indexed into the earbow index holes on<br />

the lateral aspects of the fossae (fig. 50).<br />

Attach the facebow (or earbow) assembly<br />

to the articulator by equally adjusting<br />

both posterior reference slides so that<br />

both scales give the same reading when<br />

the posterior reference pins are firmly<br />

seated in their respective condylar or<br />

earbow index holes. This can be done<br />

most conveniently by indexing both<br />

posterior reference pins in their respective<br />

holes. Observe the setting to which<br />

the slides are adjusted. The sum of<br />

these settings divided by 2 is the setting<br />

to which the posterior reference slides<br />

are adjusted for proper transfer of the<br />

facebow to the articulator. (For example,<br />

the sum of +30 and -10+=20 divided by<br />

2=+10.)<br />

If the facebow was oriented to the patient<br />

to posterior reference points located<br />

precisely with a hinge axis locator,<br />

marked readjustment of the posterior<br />

reference slides of the facebow to accommodate<br />

it to the articulator could introduce<br />

a slight mounting error. In order<br />

to minimize this error, mounting studs<br />

are inserted into the lateral aspects of<br />

the condylar elements to minimize the<br />

amount of adjustment of the posterior<br />

reference slides (fig. 51).<br />

Facebow<br />

Index<br />

Earbow<br />

Index<br />

fig. 50<br />

fig. 48 fig. 51<br />

25

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