its the occlusion and jaw relations... and articulators...
1. articulators
non adjustable: since they can not be adjusted...
can not simulate mandibular movements
distance from the hinge to occlusalplane is less than the distnce in jaw condyle and occlusal plane in oral cavity.
coz of this groove n fossa formation that although coincides with opposite tooth in an articulator does not do so in the mouth so...premature occlusal contacts
SEMI ADJUSTABLE:
adjustable to some degree but only upto an average value
2 types
NON ARCON : non anaatomical relationship of uppercomponent and lower component of articulator. means condyle and articular fossa fixed together
and ARCON: Anatomical relationship of upper n lower components AR-( articular fossa) in the upper component like in the human skull and CON( condyle in thhe lower part of articulator)
becoz of this it can be useful in accurate FDP and CROWN fabrication...no premature contacts when placing in the oral cavity!
since non arcon have fixed relation to the upper occlusal plane they r easier to handle in tootharrangement for CD or PD.
FuLLY ADJUSTABLE: can be adjusted according to a particular patient...allows full range of movement as a mandible does.
you can calculate the border movements of mandible and adjust the articulator according to those readings useful for FDP etc...
FACEBOW: a device to position the cast in the articulator in the same orientation to the condyle(HINGE) as in the actual jaw
2 types
arbitrary:average values
and kinematic: can be customized for each patient
what exactly dont u understand in the topics ...specify ,
🙂so i dont waste tym typing info u already know..