Exam 1 Flashcards
(59 cards)
In the sagittal view of the TM ligament, what is limited by the outer oblique portion?
Limits normal rotational opening movement
In the sagittal view of the TM ligament, what is limited by the inner horizontal portion?
Limits posterior movement of the condyle and disc
The centric relation of mandibular position is a ______ position, and does not need any tooth _____ to be obtained. Established the position of the _______ in the SUPERIOR and ______ location with the disc properly interposed between the condyle and the _______ ____. It also involves the ________ of the thin portion of the articular disc. It is described as the most _____ position of the condyle. Its a position of the mandible where the musculature displays minimal _____.
CONDYLAR Contact Condyle ANTERIOR Temporal bone Articulation Stable Tonus
For clinical conditions of maximum intercuspation, _____ determine the occlusal position. If centric relation and maximum intercuspation do not coincide, the patient will have _____. Most patients have some degree of a slide from centric to max intercuspation -> _-_mm in length. Max intercuspation is simultaneous ______ of all the teeth and is the “_____” of the slide. All occlusal forces should be concentrated down the long axis of ______ teeth. The max intercuspation position is dynamic in nature and will ______ throughout a patient’s life.
Teeth* Slide 1-2mm** Contact "Endpoint"* Posterior* Change*
3 normal functional activities of the Temporalis muscle
- Elevate “closing”
- Retrude (helps seat condyles into mand. fossa)
- Position mandible to obtain centric relation
Relationship of medial pole of condyle and the medial pterygoid muscle on one side establishes the ___-___ ______ of the mandible at centric relation
Mid-most Position
What makes the normal curve of occlusion possible?
The interaction of the medial pole of the condyle with the steep medial wall of the fossa prevents the mand. posterior teeth from moving straight horizontally toward the midline.
What in the normal functional activity of the lateral pterygoid: superior head?
Maintains a sustainable and consistent position of the articular disc - active during CLOSING movement of mand.
What is the parafunctional activity of the lateral pterygoid superior head?
Spasm as a result of some type of occlusal dysfunction - causes articular disc being pulled anteriorly out of the glenoid fossa
The lateral pterygoid superior head works in concert with the action and inactivity of the ______ _____. _____ in placement, and mostly covered by the medial pterygoid, but the clinician can _____ some portion of the muscle.
Interior head
Deep
Palpate
5 Actions of the mylohyoid
- (slightly) depresses mandible (NEVER elevates)
- Elevate hyoid
- Elevate floor of oral cavity
- Elevate tongue
- Important during speaking and swallowing
During normal jaw opening movement (LATE), the inferior head of the lateral pterygoid is at max. point of _______. The condyle has moved as far to the _____ as it can go and is now located at the _____ border of the slope of the articular eminence. Articular disc has rotated _______ over the posterior portion of the head of the ______. Superior head of lateral pterygoid is in max contracture, attempting to hold the articular disc over the head of the _____.
Contracture Anterior Inferior Posteriorly* Posterior Condyle Condyle
In normal jaw opening movement (LATE), the superior retrodiscal tissues are in maximum ______ and cannot further hold the articular disc in position over the head of the condyle without either _____ or ______. The posterior portion of the ______ ligament is lacking in tautness and the _____ portion of collateral ligament is taut. Superior _____ tissues are involved with tautness. _______ NOT involved in securing any aspect of the TMJ structures.
Tautness Stretching Tearing Collateral Anterior Retrodiscal Inferior
Medial pterygoid force vector =?
Superior and slightly medial (mediotrusive)
Inferior head of lateral pterygoid force vector=?
Anterior and medial (slightly mediotrusive)
Like all articulated joints in the human body, the ____ is innervated by the same nerve that provides MOTOR and SENSORY innervation to the muscles that control it. Primary innervation is through CN ___. Most of the innervation to the TMJ is by the _______ nerve (75%). Primary vascularization: superficial temporal branch of the external ______ artery. The condyle receives vascular supply through its _____ space from the inferior alveolar artery and feeder vessels from other branches that perforate the head from various angles.
TMJ CN V -trigeminal Auriculotemporal Carotid Marrow
4 features of the Maxillary arch
- Dominates mand. arch
- Larger than mand. arch (from distal of the 3rd molar on one side through the middle of each tooth to the 3rd molar on the other side)
- Wider in measurement from right to left
- Aesthetics are embedded more in the max arch due to smile line
What 2 sets of teeth only have one antagonist in the opposing arch?
- Maxillary 3rd molars
2. Mandibular central incisors
Why is an ideal plane NOT flat?
Flat plane allows for too many contacts on most posterior teeth on both sides of mouth
Why is the proper plane of occlusion curved?
Permits simultaneous functional contacts - teeth are strategically positioned in the arches at varied coordinated degrees of inclination
Forces exerted on the FIRST PREMOLARS are what compared to 3rd molars?
Forces exerted on the FIRST PREMOLARS are approximately 50% less than those exerted on the 3rd molars = LESS WORK
Where should occlusal contacts ideally occur?
Between CUSP TIP and the depth of a FOSSA (or between cusp tip and a FLAT SURFACE which is considered more stable. Contacts should NOT occur on cuspal inclines, bc these are less stable)
Classification for distally positioned 1st molar and canine relationships and excessive anterior horizontal overlap
Class 2 Malocclusion
Occlusal contacts should occur between cusp tip and ?
depth of an opposing fossa or a flat surface such as a marginal ridge (CUSP-FOSSA OCCLUSION)
