Hinge axis and Facebow

To secure a centric inter-occlusal record, we attempt to freeze the terminal hinge closure at a convenient vertical opening. Without the hinge axis, we would be unable to secure an accurate centric inter-occlusal record. Cohen stated that once the hinge-axis points had been located and marked permanently it was never necessary to repeat the procedure since the anatomic structures they represented never changed during life.The transverse axis of rotation can be located by use of an instrument called the
Face-Bow. Facebow is a caliper-like instrument used to record the spatial relationship of the maxillary arch to some anatomic reference point or points and then transfer the relationship to the articulator. The two main types of facebow is the kinematic and arbitrary type. The arbitrary type is commonly used in clinical practice and is again of two types: earpiece and fascia type.

[@dr.sazvarreza1554]

Nice lecture.

[@adentistlll5441]

ياريت يوجد ترجمة عربية 😭

[@MohanKumar-eg9qi]

kindly refer to the 12th edition of boucher to understand the uselessness of the FB

''the terminal hinge axis is a myth'' phrase seems to be a correct scientific notation.
But, ''uselessness of th FB'' may be valid according to ''some'' literaure data. but not for all. please refer to Edelhoff or Jakstad or Ahlers or the others. FB may not copy hinge axis but it is very useful in terms of transferring esthetic planes to the dental lab and also minimize the occlusal errors both centric and eccentric. Literature regarding the usefulness of FB are published by non-clinical academicians mostly, not clinician academicians. Best

[@MohanKumar-eg9qi]

the terminal hinge is a myth. the mandible cannot make pure hinge movements kindly refresh your knowledge please.