Podcast
Questions and Answers
What type of forces are stable and run along the long axis of the tooth?
What type of forces are stable and run along the long axis of the tooth?
- Lateral forces
- Tension forces
- Axial forces (correct)
- Shear forces
Which type of forces can cause damage or injury due to their instability?
Which type of forces can cause damage or injury due to their instability?
- Compression forces
- Axial forces
- Shear forces (correct)
- Tension forces
What do tension forces primarily involve?
What do tension forces primarily involve?
- Stable forces acting vertically
- Pushing from opposite sides
- Pulling forces acting from opposite sides (correct)
- Forces directed at an angle
Which teeth are primarily able to tolerate axial (compressive) loads?
Which teeth are primarily able to tolerate axial (compressive) loads?
What does the line tracings in occlusion analysis indicate?
What does the line tracings in occlusion analysis indicate?
What characterizes lateral forces in comparison to axial forces?
What characterizes lateral forces in comparison to axial forces?
Which of the following statements is true about compression forces?
Which of the following statements is true about compression forces?
What is true regarding the role of trabecular bone and the periodontal ligament?
What is true regarding the role of trabecular bone and the periodontal ligament?
What type of forces are pulling forces acting from opposite sides in occlusion?
What type of forces are pulling forces acting from opposite sides in occlusion?
What is the primary risk for anterior teeth when posterior teeth are missing?
What is the primary risk for anterior teeth when posterior teeth are missing?
In a Class III lever system, which component is the load?
In a Class III lever system, which component is the load?
How does a high occlusal contact affect the lever system in mastication?
How does a high occlusal contact affect the lever system in mastication?
What happens to the efficiency of the lever system when the load is placed closer to the fulcrum?
What happens to the efficiency of the lever system when the load is placed closer to the fulcrum?
Which of the following best describes shear forces?
Which of the following best describes shear forces?
What is the role of posterior teeth in relation to anterior teeth?
What is the role of posterior teeth in relation to anterior teeth?
How does torquing the TMJ complex affect the masticatory system?
How does torquing the TMJ complex affect the masticatory system?
What is the definition of static occlusion?
What is the definition of static occlusion?
Which of the following is NOT a determinant of occlusion?
Which of the following is NOT a determinant of occlusion?
Which term refers to the maximum intercuspation of teeth?
Which term refers to the maximum intercuspation of teeth?
How does dynamic occlusion differ from static occlusion?
How does dynamic occlusion differ from static occlusion?
What best describes centric relation?
What best describes centric relation?
Which characteristic is true of static occlusion?
Which characteristic is true of static occlusion?
What does vertical dimension refer to in occlusion?
What does vertical dimension refer to in occlusion?
Which statement accurately differentiates centric relation and maximum intercuspation?
Which statement accurately differentiates centric relation and maximum intercuspation?
Which muscle is primarily responsible for elevating the mandible?
Which muscle is primarily responsible for elevating the mandible?
What is the position of the maxillary canine cusp tip relative to the mandibular canine?
What is the position of the maxillary canine cusp tip relative to the mandibular canine?
Which component is primarily used for Angle's classification when the permanent first molars are absent?
Which component is primarily used for Angle's classification when the permanent first molars are absent?
Which of the following is considered the most important factor in occlusion?
Which of the following is considered the most important factor in occlusion?
Which muscle causes the protrusion of the mandible?
Which muscle causes the protrusion of the mandible?
In Angle’s Class II Division 1, where is the mesiobuccal cusp of the maxillary first molar positioned?
In Angle’s Class II Division 1, where is the mesiobuccal cusp of the maxillary first molar positioned?
Which classification indicates a negative overjet?
Which classification indicates a negative overjet?
What does the rest position of the mandible refer to?
What does the rest position of the mandible refer to?
What is the consequence of the unilateral contraction of the Medial Pterygoid Muscle?
What is the consequence of the unilateral contraction of the Medial Pterygoid Muscle?
What feature is distinctive of Angle's Class II Division 2?
What feature is distinctive of Angle's Class II Division 2?
In Angle's Class I, where is the maxillary canine cusp tip located?
In Angle's Class I, where is the maxillary canine cusp tip located?
The anatomy of which structure is crucial in determining the mandible position?
The anatomy of which structure is crucial in determining the mandible position?
Which of the following indicates the relationship of the maxillary first molar in a Class I classification?
Which of the following indicates the relationship of the maxillary first molar in a Class I classification?
During centric relation, the mandible is in which position relative to the maxilla?
During centric relation, the mandible is in which position relative to the maxilla?
What is the primary feature that distinguishes Class II Division 1 from Class II Division 2?
What is the primary feature that distinguishes Class II Division 1 from Class II Division 2?
Which classification would typically require surgical and orthodontic correction?
Which classification would typically require surgical and orthodontic correction?
What defines centric relation (CR) in the context of the condyles?
What defines centric relation (CR) in the context of the condyles?
Which of the following statements about maximum intercuspation (MI) is correct?
Which of the following statements about maximum intercuspation (MI) is correct?
In terms of occlusal contacts, what is true about centric relation and maximum intercuspation?
In terms of occlusal contacts, what is true about centric relation and maximum intercuspation?
What is required to achieve a repeatable centric relation position according to Dawson?
What is required to achieve a repeatable centric relation position according to Dawson?
Why does centric relation (CR) rarely equal maximum intercuspation (MI)?
Why does centric relation (CR) rarely equal maximum intercuspation (MI)?
How is the rest position defined in relation to CR and MI?
How is the rest position defined in relation to CR and MI?
What is the significance of the term 'interference-free occlusion' regarding centric relation?
What is the significance of the term 'interference-free occlusion' regarding centric relation?
What outcome does not occur in centric relation?
What outcome does not occur in centric relation?
Flashcards
Static Occlusion
Static Occlusion
The relationship between the maxillary and mandibular teeth when the jaws are not moving.
Dynamic Occlusion
Dynamic Occlusion
The study of how teeth make contact when the jaw is moving.
Centric Relation
Centric Relation
The point where the mandible is in its most retruded position, independent of tooth contact.
Maximum Intercuspation
Maximum Intercuspation
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Axial Forces
Axial Forces
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Shear Forces
Shear Forces
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Lever
Lever
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Vertical Dimension
Vertical Dimension
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Compression Forces
Compression Forces
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Class I Lever
Class I Lever
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Class II Lever
Class II Lever
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Class III Lever
Class III Lever
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Masticatory system as a Class III Lever
Masticatory system as a Class III Lever
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High Occlusal Contact & Lever Change
High Occlusal Contact & Lever Change
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Angle's Classification
Angle's Classification
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Angle's Class I
Angle's Class I
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Angle's Class II
Angle's Class II
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Angle's Class II Division 1
Angle's Class II Division 1
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Angle's Class II Division 2
Angle's Class II Division 2
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Angle's Class III
Angle's Class III
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Overjet
Overjet
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Overbite
Overbite
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Centric Relation (CR)
Centric Relation (CR)
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Maximum Intercuspation (MI)
Maximum Intercuspation (MI)
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Rest Position
Rest Position
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What Influences Mandible Position?
What Influences Mandible Position?
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What Factors Determine Mandible Position?
What Factors Determine Mandible Position?
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Muscles that Influence Mandible Position
Muscles that Influence Mandible Position
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How Do Muscles Affect Mandible Position?
How Do Muscles Affect Mandible Position?
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Why is CR Important?
Why is CR Important?
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Dawson's Mandibular Position
Dawson's Mandibular Position
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Mandibular Manipulation
Mandibular Manipulation
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Difference between CR and MI
Difference between CR and MI
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Centric Relation is Condyle-centric
Centric Relation is Condyle-centric
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Maximum Intercuspation is Tooth-centric
Maximum Intercuspation is Tooth-centric
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Study Notes
Static Occlusion 1: Rest Position and Intermaxillary Relations
- Static occlusion focuses on the contacts between teeth when the jaw is still.
- These contacts are points, not lines
- Occlusion is the static relationship between incising or masticating tooth surfaces.
- Key factors influencing tooth position and occlusion include tooth size, arch width, muscle influence (lips, cheeks, tongue), oral habits (pipe, musical instrument), mesial drift, occlusal contact, and periodontal health.
- Axial forces are stable and along the long axis of the teeth (important for premolars and molars).
- Shear forces are unstable, not along the long axis, and often cause damage or injury, and are common in anterior teeth.
Learning Objectives
- Differentiate between axial and shear forces.
- Identify different types of levers.
- Define centric relation.
- Define maximum intercuspation.
- Differentiate between centric relation, maximum intercuspation, and rest position.
- Define vertical dimension.
- Explain the occlusal scheme used in restorative dentistry.
- Classify Angle's relation in a clinical setting.
Parts of a Course in Occlusion
- Part 1 (Winter): Static Occlusion I: Rest position and intermaxillary relations; Static Occlusion II: Occlusal contacts; Dynamic Occlusion I: Masticatory Cycle & Envelope of Function; Dynamic Occlusion II: Mandibular Movements; Occlusion review
- Part 2 (Spring): Occlusal contacts and mandibular movements: clinical considerations; Occlusion review for finals.
Occlusion: Static vs Dynamic
- Static occlusion: Study of tooth contacts when the jaw is stationary. Contacts are points.
- Dynamic occlusion: Study of tooth contacts when the jaw is moving. Contacts are lines.
Forces in Occlusion
- Forces are a power that causes an object to move.
- Forces in occlusion include compression, Shear, and Tension.
- Compression: Stable forces along the long axis of the tooth. Found in posterior teeth, absorbed by trabecular bone and periodontal ligaments.
- Shear: Unstable forces, often causing damage or movement. Occur laterally and in anterior teeth
- Tension: Pulling forces acting from opposite sides and directed along the long axis of the tooth.
Types of Levers
- Class 1 lever: Fulcrum (pivot point) is between the load and the effort (e.g., skull and jaw)
- Class 2 lever: Load is between the fulcrum and the effort (e.g., muscles in jaw)
- Class 3 lever: Effort is between the load and the fulcrum (e.g., muscles in jaw and food)
Angle's Classification
- Developed by Edward Angle.
- Based on the relative position of the maxillary first molar—canine position if first molar isn't present.
- Class I: Mesiobuccal cusp of the maxillary first molar is positioned over the buccal groove of the mandibular first molar, and the maxillary canine's cusp tip is in the embrasure between the mandibular canine and premolar
- Class II division 1: Maxillary arch is anterior to normal, and the maxillary canine overlaps the mandibular canine, and there is a relatively high horizontal overlap.
- Class II division 2: Maxillary arch is anterior to normal, and the maxillary canine does not reach as far as the first premolars, and there is a relatively high vertical overlap.
- Class III: Maxillary arch is posterior to normal, and the mandibular canine overlaps the maxillary canine.
Mandibular Static Positions
- Centric Relation (CR): Single most important factor in occlusion, the only condylar position in which an interference-free occlusion is possible.
- Maximum Intercuspation (MI): Determined by the teeth’s maximum contact.
- Rest Position: Comfortable, upright mandible position where muscles are relaxed.
Vertical Dimension
- Vertical Dimension of Occlusion (VDO): Vertical measurement between arbitrary points on the face when the teeth are contacting.
- Vertical Dimension at Rest (VDR): Vertical measurement between arbitrary points on the face when the jaws are at rest.
Clinical Considerations
- Special manipulation is needed to guide the mandible into CR.
- Initial contact identification in CR is difficult.
- CR and MI don't always coincide. A discrepancy exists in up to 90% of people.
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Description
Test your knowledge on various forces affecting dental occlusion and the stability of teeth. This quiz covers tension and compression forces, the role of trabecular bone, and how occlusal contact impacts mastication. Perfect for dental students and professionals seeking to reinforce their understanding of dental mechanics.
