Questions and Answers
Which method of registering Centric Relation is noted for its accuracy when using a jig?
What is the primary requirement for a stable occlusion when the condyles are in Centric Relation?
Which definition best describes Maximal Intercuspation?
What is the importance of Disclusion in occlusion requirements?
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Which aspect of Anterior Guidance is critical for ensuring harmony in occlusion?
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Which method involves tracing movements outside the mouth to register CR?
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What is the recommended buffer space needed for disclusion of posterior teeth?
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Which characteristic is true about the relationship between Centric Occlusion and Maximal Intercuspation?
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What is the primary movement of the mandible during maximum opening?
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What is the function of the lateral pterygoid muscles during the opening of the mandible?
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Which position is characterized by the condyles articulating with the thinnest avascular portion of their respective disks?
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Why is centric relation considered a reliable treatment position?
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What is the maximum allowed distance for the movement of the mandible before it combines with rotational and translational movements?
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What is the Bennet Angle associated with?
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Which of the following is NOT a habitual position of the jaw?
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What role does a deprogramming device play in registering centric relation?
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What is the key difference between arcon and non-arcon articulators?
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Which statement best describes the purpose of registering the terminal hinge position?
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Which of the following best describes the concept of arbitrary hinge axis?
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What does a face-bow instrument primarily accomplish?
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Which of the following factors is NOT a reason to register the terminal hinge position?
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What is the significance of the transverse horizontal axis in articulators?
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What is one of the challenges faced when trying to register a kinematic hinge axis?
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Which of the following statements about the angulation of the mechanical fossa is true?
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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.
