Dental Occlusion Techniques

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Questions and Answers

Which method of registering Centric Relation is noted for its accuracy when using a jig?

Intra-oral tracing

Lucia jig/Leaf gauge

Bimanual Manipulation (correct)

Chin-point guidance

What is the primary requirement for a stable occlusion when the condyles are in Centric Relation?

Equal distribution of forces across all teeth

Unified disclusion of all anterior teeth

Stable stops on all teeth with point contacts (correct)

Maximal intercuspation of all anterior teeth

Which definition best describes Maximal Intercuspation?

The position of the mandible in full protrusion

The best fit of the teeth with dynamic condylar movement

The complete intercuspation of opposing teeth independent of condylar position (correct)

The state of dental occlusion under extreme lateral force

What is the importance of Disclusion in occlusion requirements?

It allows for separation of posterior teeth during specific movements Signup and view all the answers

Which aspect of Anterior Guidance is critical for ensuring harmony in occlusion?

A gentle slanted slope of the upper lingual surfaces Signup and view all the answers

Which method involves tracing movements outside the mouth to register CR?

Extra-oral tracing Signup and view all the answers

What is the recommended buffer space needed for disclusion of posterior teeth?

1 mm Signup and view all the answers

Which characteristic is true about the relationship between Centric Occlusion and Maximal Intercuspation?

They coincide in approximately 90% of the population Signup and view all the answers

What is the primary movement of the mandible during maximum opening?

A combination of rotational and translational movement Signup and view all the answers

What is the function of the lateral pterygoid muscles during the opening of the mandible?

To pull the condyle forward and down Signup and view all the answers

Which position is characterized by the condyles articulating with the thinnest avascular portion of their respective disks?

Centric relation Signup and view all the answers

Why is centric relation considered a reliable treatment position?

It records the horizontal relation of the mandible to the maxilla Signup and view all the answers

What is the maximum allowed distance for the movement of the mandible before it combines with rotational and translational movements?

20mm Signup and view all the answers

What is the Bennet Angle associated with?

The movement in the opposite side during lateral excursion Signup and view all the answers

Which of the following is NOT a habitual position of the jaw?

Laterotrusive position Signup and view all the answers

What role does a deprogramming device play in registering centric relation?

It relieves interferences and normalizes muscle function Signup and view all the answers

What is the key difference between arcon and non-arcon articulators?

Non-arcon has the mechanical fossa on the upper sphere. Signup and view all the answers

Which statement best describes the purpose of registering the terminal hinge position?

To reduce errors in restorations along various vertical dimensions. Signup and view all the answers

Which of the following best describes the concept of arbitrary hinge axis?

It relies on average movements for articulator programming. Signup and view all the answers

What does a face-bow instrument primarily accomplish?

It transfers the maxillary arch's relationship to the articulator. Signup and view all the answers

Which of the following factors is NOT a reason to register the terminal hinge position?

It allows for dimensional dynamic registrations. Signup and view all the answers

What is the significance of the transverse horizontal axis in articulators?

It indicates the center of mandibular rotation. Signup and view all the answers

What is one of the challenges faced when trying to register a kinematic hinge axis?

There is significant variability in individual anatomy. Signup and view all the answers

Which of the following statements about the angulation of the mechanical fossa is true?

In non-arcon instruments, this angle changes during articulation. Signup and view all the answers

Study Notes

Recording Medium and Registration Methods

Recording medium must allow forces from muscles without resistance.
Methods for registering Centric Relation (CR) include:
- Bimanual Manipulation (Dawson): Most accurate with jig.
- Chin-point guidance (McCollum).
- Lucia jig/Leaf gauge (Lucia).
- Deglutition (Shanahan).
- Extra-oral tracing (Gysi).
- Intra-oral tracing (Sears).

Maximal Intercuspation

Maximal intercuspation is defined as complete intercuspation of opposing teeth independent of condylar position.
Known as the ideal occlusal relationship in the absence of pathologies.
Centric Occlusion occurs when teeth contact in Centric Relation, which may not align with maximal intercuspation in 10% of individuals.

Requirements for Stable Occlusion

Stable stops on all teeth when condyles are in Centric Relation (CR).
Anterior Guidance aligns with the Envelope of Function; slanted slopes of upper lingual surfaces guide lower teeth.
Posterior teeth should disclude during protrusive movements, ideally managed by the six front teeth.
Lateral excursions should disclude posterior teeth on the non-working side, recommending a 1 mm buffer space.
Suprahyoid and lateral pterygoid muscles facilitate movement with maximum opening reaching 45mm.
Lateral pterygoid muscles pull the condyle medially and downward during movement, at a specific angle known as the Bennet Angle.

Habitual Positions

Rest Position
Centric Relation (CR)
Intercuspation Position (ICP)

Centric Relation (CR)

CR is a maxillomandibular relationship where condyles articulate with the disks independent of tooth contact.
CR serves as a treatment position due to its repeatability, independence from tooth contact, load-bearing stability, and ability to relieve muscular interferences.
Mechanical fossa adjustments aid in capturing this relationship.

Mechanical Considerations

Mechanical fossa on the upper and condylar spheres on the lower embody fixed angulation relative to the occlusal plane in arcon instruments.
Non-arcon versions have variable angulations that change upon opening.

Transverse Horizontal Axis

Registering the terminal hinge position is critical as border movements begin at this point.
Aids in programming articulators for accurate mandibular movement reproduction.
Holistic movements are acknowledged as valid substitutes for exact duplication, supporting the use of arbitrary hinge axis principles.

Face-Bow Functionality

Face-bow transfers the maxillary arch's relationship to the articulator, aligning casts to the opening axis.
Establishes horizontal and esthetic references using facial landmarks for maxillary cast positioning.

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Description

This quiz covers various methods for registering centric relation and defining maximal intercuspal position in dentistry. Explore techniques like bimanual manipulation, chin-point guidance, and others to test your knowledge in this critical area of dental practice. Perfect for students and professionals looking to solidify their understanding of occlusal techniques.