Questions and Answers
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?
Neutroocclusion
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.
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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.
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Specify what the following types of Dewey sub classifications represent:
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Match the following extensive classifications of Class I malocclusion:
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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.
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What are the two divisions of Class II malocclusions?
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What is Class III malocclusion?
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What are the skeletal cephalometric requirements for Class 1?
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Adult mandibular arch has more space than maxillary arch.
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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.
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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?
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Leeway space is ___ mm/side in maxilla and ___ mm/side in mandible.
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Primary canine roots stimulate vertical alveolar growth.
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What does molar shift during the permanent dentition refer to?
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What are Andrew's Six Keys of Normal Occlusion?
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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.
