Lecture 9 Flashcards
(23 cards)
Centric relation
anything after
rotation when the mouth opens
We have no control over
translation
Only control rotation.
B can be
bit on, won’t be painful
Brace condyle against
superior
inferior portion of fossa* key
element
PRP: at this point,
central incisors are related to the MI position, but not closed.
They are suspended in space.
Not really at rest, work still done to suspend in space, but teeth are not touching.
Coronal Plane Tracing of the Range of Movement
Go from canine tip to canine tip, then go all the way out.
Effect of Intercondylar Distance on Mandibular Lateral Movements
Has effect on cusp hight and angulation
The Orthopedically Stable Joint Position
Optimal joint relationship is achieved only when the articular disks are properly interposed between the condyles and the articular fossae (CR).
In this position, the articular surfaces and tissues of the joints are aligned such that forces applied by the masculature do not create any damage.
Optimal Functional Tooth Contacts
The musculoskeletally stable joint position can only be maintained when it is in harmony with a stable occlusal position.
More teeth contacts provide more
stabilization of the mandible, and decrease the forces to each tooth.
Even and simultaneous contact of all
teeth during mandibular closure.
Optimal tooth contact
CO coincides with MI (CO=MI).
Direction of Occlusal Forces - Osseous tissues do not
tolerate pressure forces.
Direction of Occlusal Forces - The PDL is present between the
roots and the alveolar bone to control these forces.
Supraeruption - tooth keeps
coming up to meet opposing tooth
Axial Loading
Cusp tip to flat surface, tripodization
Mutually Protected Occlusion - In maximal intercuspal position, posterior teeth come into
contact and act as stops to minimize horizontal load on anterior teeth.
Mutually Protected Occlusion - The anterior teeth guide
excursive movements of the mandible so that no posterior teeth contacts occur during lateral or protrusive excursions.
Effects of Tooth Loss
- Supraeruption
- Tilting
- Loss of contact
- Loss of posterior tooth support
- Loss of vertical dimension
- Flaring of anterior teeth
- Non-working interferences
Occlusal Treatment Goals 1. To direct
occlusal forces along the long axes of teeth (stable
posterior contacts).
Occlusal Treatment Goals 2. In MI position, all mandibular teeth should
contact their maxillary opponents at the same time and with same intensity (CO=MI).
Occlusal Treatment Goals 3. To furnish a smooth
protrusive path guided by the anterior teeth without any interference from occlusal contacts between the posterior teeth (posterior disclusion).
Occlusal Treatment Goals 4. Working contacts (canine guidance or group function) should not be
prevented from contacting by non-working interferences.
