Podcast
Questions and Answers
Which of the following is NOT a type of intra-arch malocclusion?
Which of the following is NOT a type of intra-arch malocclusion?
What does a buccal inclination refer to?
What does a buccal inclination refer to?
Which of the following is NOT a type of displacement?
Which of the following is NOT a type of displacement?
Which of the following is NOT a common type of intra-arch malocclusion?
Which of the following is NOT a common type of intra-arch malocclusion?
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Which of the following best describes the definition of rotation in the context of intra-arch malocclusion?
Which of the following best describes the definition of rotation in the context of intra-arch malocclusion?
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Which of these conditions involves changes in the position of the tooth crown and root?
Which of these conditions involves changes in the position of the tooth crown and root?
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What is the difference between mesial and distal inclination?
What is the difference between mesial and distal inclination?
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Which of the following is an example of an inter-arch malocclusion?
Which of the following is an example of an inter-arch malocclusion?
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What characterizes Type 1 of Angle's Class I modification?
What characterizes Type 1 of Angle's Class I modification?
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In canine relationship classification, what does Class II indicate?
In canine relationship classification, what does Class II indicate?
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What is the primary focus of Andrews' six keys?
What is the primary focus of Andrews' six keys?
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Which of the following describes Type 4 of Angle's Class I modification?
Which of the following describes Type 4 of Angle's Class I modification?
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How does the Ackerman-Profitt classification system categorize malocclusions?
How does the Ackerman-Profitt classification system categorize malocclusions?
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Type 3 of Angle's Class I modification is characterized by:
Type 3 of Angle's Class I modification is characterized by:
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What does Class III in canine relationship indicate?
What does Class III in canine relationship indicate?
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What best describes Type 5 of Angle's Class I modification?
What best describes Type 5 of Angle's Class I modification?
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What characterizes class II - Division 1 malocclusion?
What characterizes class II - Division 1 malocclusion?
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Which of the following statements about infra/supraversion is true?
Which of the following statements about infra/supraversion is true?
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What is the definition of overjet?
What is the definition of overjet?
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Which plane of malocclusion does Angle's classification primarily consider?
Which plane of malocclusion does Angle's classification primarily consider?
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What is a drawback of Angle's classification?
What is a drawback of Angle's classification?
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How is a buccal crossbite characterized?
How is a buccal crossbite characterized?
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What defines a deep bite in dental terms?
What defines a deep bite in dental terms?
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What does transposition in dentistry refer to?
What does transposition in dentistry refer to?
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Flashcards
Intra-arch Malocclusion
Intra-arch Malocclusion
Malocclusions involving only one dental arch, such as the upper or lower set of teeth.
Abnormal Inclinations
Abnormal Inclinations
A type of intra-arch malocclusion where a tooth is tilted abnormally, often in a specific direction.
Buccal Inclination
Buccal Inclination
A tooth is tilted towards the cheek side. (Labial for front teeth, Buccal for back teeth).
Lingual Inclination
Lingual Inclination
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Displacement
Displacement
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Buccal Displacement
Buccal Displacement
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Lingual Displacement
Lingual Displacement
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Rotation
Rotation
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Transposition
Transposition
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Infra/Supraversion
Infra/Supraversion
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Molar Relationship
Molar Relationship
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Class II Malocclusion
Class II Malocclusion
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Class III Malocclusion
Class III Malocclusion
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Overjet
Overjet
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Overbite
Overbite
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Transverse Plane Malocclusion
Transverse Plane Malocclusion
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Dewey's Modification Type 1
Dewey's Modification Type 1
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Dewey's Modification Type 2
Dewey's Modification Type 2
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Dewey's Modification Type 3
Dewey's Modification Type 3
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Dewey's Modification Type 4
Dewey's Modification Type 4
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Dewey's Modification Type 5
Dewey's Modification Type 5
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Canine Relationship Classification
Canine Relationship Classification
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Canine Class I
Canine Class I
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Canine Class II
Canine Class II
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Study Notes
Malocclusion Classification
- Malocclusion is the description of dentofacial deviations based on a common characteristic.
- Malocclusions are broadly categorized into three types: intra-arch, inter-arch, and skeletal.
- Intra-arch malocclusions involve misalignment of teeth within the same arch (maxillary or mandibular).
- Inter-arch malocclusions involve misalignment of teeth in both the maxillary and mandibular arches.
- Skeletal malocclusions involve underlying skeletal structures.
Intra-arch Malocclusions
- Intra-arch malocclusions refer to tooth misalignment within a single dental arch.
- This includes abnormal tooth inclinations, displacement, rotation, transposition, or abnormal positioning.
- Subtypes include: inclination (labial/buccal, lingual/palatal, mesial, distal), displacement (labial, lingual, mesial, distal), rotation (mesiolingual, distolabial, distolingual, mesiolabial), and transposition.
- Supraversion and infraversion are also forms of tooth misplacement.
Abnormal Inclinations
- Abnormal inclinations describe the tilting of a tooth crown in one of four directions.
- Buccal inclination refers to labial (anterior) or buccal (posterior) tilting of the crown.
- Lingual inclination refers to palatal (maxillary) or lingual (mandibular) tilting.
- Mesial inclination tilts the crown towards the midline.
- Distal inclination tilts the crown away from the midline.
Displacement
- Displacement involves the tooth's bodily movement in a certain direction to occupy an abnormal location.
- Buccal displacement involves movement in the labial/buccal direction.
- Lingual displacement involves movement in the lingual direction.
- Mesial displacement involves movement towards the midline.
- Distal displacement involves movement away from the midline.
Rotation
- Rotation involves the tooth's movement around its long axis.
- Two types of rotations are mesiolingual (distolabial) and distolingual (mesiolabial) .
Transposition
- Transposition is when two teeth switch places in the arch.
Infra/Supraversion
- Infraversion occurs when a tooth does not reach the normal occlusion level due to eruption rate.
- Supraversion occurs when a tooth erupts above the normal occlusion level.
Interarch Malocclusions
- Sagittal plane, transversal plane, and vertical plane are involved in the description of interarch malocclusions.
- Molar relationship:
- Neutroclusion (Class I): normal relationship between the maxillary and mandibular first molars.
- Distoclusion (Class II): the maxillary first molar is mesially positioned in relation to its mandibular counterpart.
- Mesioclusion (Class III): the maxillary molar is distally positioned in relation to its mandibular counterpart.
- Canine relationship: This analysis also aids in classifying malocclusions along the anteroposterior plane.
- Incisor relationship:
- Overjet: horizontal overlap of upper and lower incisors, typically 2-3mm.
- Excessive Overjet: over 3mm overlap.
- Edge to edge: incisal edges of upper and lower incisors are in contact without overjet.
- Anterior crossbite: anterior teeth of one arch are located behind the teeth of the other arch.
- Overbite: vertical overlap of incisors, normal range of overlap is typically determined.
- Deep bite: Excessive vertical overlap.
- Open bite: Reduced or lacking vertical overlap.
Transverse Plane Malocclusions
- Upper and lower dental midlines describe malocclusions in the transverse plane.
- Buccal and lingual crossbites are two examples of the different types of malocclusions.
Skeletal Malocclusions
- Skeletal malocclusions involve underlying bone structure issues:
- Sagittal plane malocclusions (prognathic/retrognathic jaws)
- Vertical plane malocclusions (open/deep bite)
- Transverse plane malocclusions (skeletal crossbites/scissors bite).
Angle's Classification
- Angle's classification categorizes malocclusions based on the mesio-distal relationship of permanent first molars.
- The maxillary first molar is considered a fixed reference point.
- Class I: normal molar relationship.
- Class II: the maxillary molar is mesially positioned relative to the mandibular first molar.
- Class III: the maxillary molar is distally positioned relative to the mandibular first molar.
- Class II can be further categorized into divisions (1 or 2) based on incisor position (protrusions or retrusion).
Dewey's Modification of Angle's Classification
- Dewey's modifications address some shortcomings of Angle's classification scheme:
- Includes types considering overcrowded/proclined/linguoversed anterior teeth and molars.
British Standards Institute Incisor Classification
- Describes malocclusions based on incisor position relative to the cingulum plateau, categorizing as Class I, II, or III.
Andrews' Six Keys
- Andrews analyzed "ideal" occlusions to identify six key characteristics: molar relationships, incisor inclinations, absence of spaces and rotations, and a flat curve of Spee.
Ackerman-Proffit System
- Akerman and Proffitt created a comprehensive classification system examining malocclusion in all three planes (sagittal, transversal, vertical) to quantify severity.
Classification by Dentosfacial Traits
- Comprehensive analysis of five aspects (dentofacial appearance, alignment, anteroposterior, transverse, and vertical traits) aids in classifying malocclusions.
Canine Relationship
- Canine relationship, which is the position of maxillary permanent canines in reference to lower canine/first premolar embrasures, is another method of describing malocclusion.
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Description
Test your knowledge on the classification of malocclusions, focusing on intra-arch, inter-arch, and skeletal types. Delve into the specifics of tooth misalignment, including various subtypes and their characteristics. This quiz is essential for understanding dental deviations.
