O- Angular spine of sphenoid I- Mandibular lingula
O- Styloid process I- Angle of the mandible
the exquisitely sensitive protective reflex system that guards the teeth and their supporting structures against excessive stress
Which ligaments maintain the position of the disk in relation to the condyle
The medial and lateral collateral ligaments and the posterior ligament
What ligament facilitates translation of the condyle and prevents rotation that would compromise the anatomic structures in the neck
the maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anterior-superior postion against the slopes of the articular eminences. This position is independent of tooth contact and it is restricted to a purely rotary movement about the transverse horizontal axis. The medial pols of the condyle are braced against the medial articular lip of the fossa
the contact of the teeth when the TMJs are in centric relation
the relation of the mandible and maxilla when the teeth are in maximum occlusal contact, irrespective of the position or alignment of the condyle disk assemblies
Goal of occlusal treatment
to have MI with the TMJs in centric relation
Any movement from CR is...
"A" contacts are on the mandibular stamp cusps and may be located on the facial surface up to the crest of the marginal ridge against the inner inclines of the maxillary opposing or shearing ridges. There is an "A" contact on the mesial and distal side of each stamp cusp that has an opposing tooth.
"B" contacts are always on inner inclines of stamp cusp ridges (opposing stamp cusp ridges). They may be located just off the tip of the stamp cusp anywhere along the ridge just before the base of the ridge.
C" contacts are on maxillary stamp cusps and may be located on the lingual surface up to the crest of the marginal ridge against the inner inclines of the mandibular shearing ridges.
stabilize the teeth bucco-lingually
Closer stopper contacts
those contacts that occur on the mesial occlusal inclines of mandibular teeth and on distal occlusal inclines of maxillary teeth (Close to the tip)
Equalizer occlusal contacts
contacts that occur on the distal occlusal inclines of mandibular teeth and on the mesial occlusal inclines of maxillary teeth (close to the fossa)
Number of cusp tips (elevations) in the maxilla and mandible
Maxilla= 24 Mandible= 26-30 (depending on the size and shape of the 2nd premolar and 2nd molar)
Functional cusps (Maxillary lingual cusps and mandibular buccal cusps)
Nonfunctional cusps (Maxillary buccal cusps and mandibular lingual cusps)
the highest contours that circumscribes the occlusal table
Cusp- Marginal ridge contact
One tooth to two teeth
Cusp - Fossa contact
One tooth to one tooth
Tripodized Cusp - Fossa Contact
Tangential contacts around the tip of the cusp- none at the tip
May occur in unworn dentition or created for full mouth rehab
Must have contacts on opposing inclines of same cusp or other cusps on the same tooth to prevent slide