Orientation Jaw relation
- Records the hinge axis of a body
- It is the relation of maxillary / mandibular bone to the cranial base
- Not the relation between maxilla & mandible OK!
- FACE BOW – used to record the hinge axis
- 3 points of face bow – 2 ears. Nose tip / root

Centric Occlusion
- Maximum intercuspation of opposing teeth
- It is independent of condylar position
- Maximum intercuspal position

Centric Relation
- It is the maxilla-mandibular relation
- Condylar head of the mandibular articulates with the thinnest avascular position of their respective disc
- Terminal hinge position
- Anterior & superior position ( condylar disc complex )
- Against the slope of the articular eminence

Interocclusal Record Materials (bite registration materials)
- Polyvinyl siloxane – fast-setting material
- Alu wax
- Polyether