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Describe Angle's Classification System.
Describe Angle's Classification System.
Based on molar relationship. MB cusp of UM articulates with the buccal groove of the LM and constitutes a Class I. Canine relationship: UC articulates between LC and LP1. Ignores skeletal/muscular effects.
What is another term for Class I occlusion?
What is another term for Class I occlusion?
Neutroocclusion
What is Class I malocclusion?
What is Class I malocclusion?
Class I malocclusion has the normal molar relationship but the incorrect line of occlusion.
Normal occlusion is an exact point of occlusion that not many of the population possess.
Normal occlusion is an exact point of occlusion that not many of the population possess.
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In Dewey's sub classification system, Dewey recognized molar drift - and suggested that molars must be placed back in their correct positions.
In Dewey's sub classification system, Dewey recognized molar drift - and suggested that molars must be placed back in their correct positions.
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Specify what the following types of Dewey sub classifications represent:
Specify what the following types of Dewey sub classifications represent:
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Match the following extensive classifications of Class I malocclusion:
Match the following extensive classifications of Class I malocclusion:
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What is another name for Class II malocclusion?
What is another name for Class II malocclusion?
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In Class II malocclusions, there can be full cusp, 1/2, or 1/4 cusp Class II.
In Class II malocclusions, there can be full cusp, 1/2, or 1/4 cusp Class II.
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What are the two divisions of Class II malocclusions?
What are the two divisions of Class II malocclusions?
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What is Class III malocclusion?
What is Class III malocclusion?
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What are the skeletal cephalometric requirements for Class 1?
What are the skeletal cephalometric requirements for Class 1?
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Adult mandibular arch has more space than maxillary arch.
Adult mandibular arch has more space than maxillary arch.
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Probability tables to determine space for unerupted teeth are used.
Probability tables to determine space for unerupted teeth are used.
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Dental arches are getting smaller in size, despite children getting physically larger.
Dental arches are getting smaller in size, despite children getting physically larger.
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What eruption theory involves the tooth being propelled upward by various factors?
What eruption theory involves the tooth being propelled upward by various factors?
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What is the difference between primate space and Leeway space?
What is the difference between primate space and Leeway space?
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Leeway space is ___ mm/side in maxilla and ___ mm/side in mandible.
Leeway space is ___ mm/side in maxilla and ___ mm/side in mandible.
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Primary canine roots stimulate vertical alveolar growth.
Primary canine roots stimulate vertical alveolar growth.
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What does molar shift during the permanent dentition refer to?
What does molar shift during the permanent dentition refer to?
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What are Andrew's Six Keys of Normal Occlusion?
What are Andrew's Six Keys of Normal Occlusion?
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What is the ugly duckling stage?
What is the ugly duckling stage?
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Study Notes
Angle's Classification System
- Class I molar relationship: MB cusp of upper molar (UM) articulates with buccal groove of lower molar (LM).
- Canine relationship in Class I: Upper canine (UC) articulates between lower canine (LC) and lower first premolar (LP1).
- Excludes skeletal and muscular factors in occlusion assessment.
- Despite limitations, widely used in orthodontic classification.
Class 1 Occlusion
- Also referred to as Neutroocclusion, indicating a normal occlusal relationship.
Class I Malocclusion
- Defined by the normal molar relationship, but an improper line of occlusion.
Normal Occlusion
- Classified as a range, not a singular point, balancing subjective and objective diagnostics.
Dewey Subclassification System
- Recognizes molar drift; emphasizes repositioning molars to correct spaces.
- Dewey Types:
- Type 1: Anterior crowding
- Type 2: Anterior protrusion
- Type 3: Anterior crossbite
- Type 4: Posterior crossbite
- Type 5: Molar mesial drift
Extensive Classification of Class I Malocclusion
- Types 1-12 cover various crowding, spacing, inclination, and bite characteristics:
- Type 1: Anterior crowding
- Type 2: Posterior crowding
- Type 3: Anterior spacing
- Type 4: Posterior spacing
- Type 5: Anterior proclination
- Type 6: Anterior retroclination
- Type 7: Anterior openbite
- Type 8: Posterior openbite
- Type 9: Anterior deepbite
- Type 10: Anterior crossbite
- Type 11: Posterior crossbite
- Type 12: Bimaxillary protrusion
Class II Malocclusion
- Also called Distocclusion, characterized by upper dentition positioned forward relative to lower dentition.
- Can manifest as full, half, or quarter cusp Class II situations.
- Divisions of Class II:
- Division 1: Maxillary incisors proclined.
- Division 2: Maxillary incisors retroclined or lateral incisors protruded with central incisor retroclined.
- Subdivisions: Unilateral Class II molars.
Class III Malocclusion
- Defined by mandibular dentition positioned forward relative to maxillary, characterized by edge-to-edge bite or negative overjet.
- Includes True Class III (skeletal) and Pseudo Class III (muscular).
Simon System
- A comprehensive system examining occlusion in the sagittal, transverse, orbital, and Frankfurt planes.
Lischer's Nomenclature
- Classification of tooth positions using terms such as mesioversion and distoversion.
Aetiological Classification
- Categorizes malocclusions based on osseous, muscular, and dental factors.
Diagnostic Classification of Malocclusion
- Involves evaluating facial proportions, dental arch alignment, and skeletal/dental relationships.
Measurement Techniques
- Overbite measured in mm or percentage with appropriate tools.
- Overjet signifies the horizontal distance, while overbite indicates vertical overlap between incisal edges.
Types of Crossbites
- Defined as variations based on occlusal relationships, including edge-to-edge and lingual non-occlusion.
Andrew's Six Keys of Normal Occlusion
- Specifies conditions for optimal occlusion:
- Class I molars
- Crown angulation and torque
- Absence of rotated teeth
- Tight contacts
- Flat Curve of Spee
Space Considerations
- Primate spacing occurs mesial to upper canines and distal to lower canines; important for dental arch development.
- Leeway space results from primary molar replacement by smaller premolars, providing additional arch space.
- Loss of Leeway space can occur due to early primary tooth extractions or caries.
Eruption and Growth Theories
- Pressure and traction theories explain tooth eruption processes influenced by biological and environmental factors.
- Molar shifts during permanent dentition succession involve anterior force and space adaptation for interdigitation.
- Eruption patterns of maxillary and mandibular teeth follow specific sequences.
Evolutionary Aspects
- Dental arch evolution relates to growth patterns, arch size adjustments, and the coordination of occlusion and aesthetic functions.
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Description
This quiz delves into Angle's Classification System, focusing on the molar and canine relationships and their implications in dental assessment. Understand the nuances of Class I classification based on molar relationships, and explore how this system, despite its limitations, remains prevalent in practice.
