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Questions and Answers
Which term describes a tooth that is tipped towards the mesial position?
Which term describes a tooth that is tipped towards the mesial position?
What does the term 'Supraversion' indicate regarding a tooth's position?
What does the term 'Supraversion' indicate regarding a tooth's position?
In orthodontics, which malocclusion occurs due to irregular placement of teeth in the dental arch?
In orthodontics, which malocclusion occurs due to irregular placement of teeth in the dental arch?
Which plane is used to describe anterior-posterior relationships in the context of dental arches?
Which plane is used to describe anterior-posterior relationships in the context of dental arches?
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What condition describes a tooth that is short of the line of occlusion?
What condition describes a tooth that is short of the line of occlusion?
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Which term refers to a tooth that is rotated on its long axis?
Which term refers to a tooth that is rotated on its long axis?
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What is the primary characteristic of a tooth in 'Distoversion'?
What is the primary characteristic of a tooth in 'Distoversion'?
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Which type of malocclusion arises from the wrong order of teeth position in the arch?
Which type of malocclusion arises from the wrong order of teeth position in the arch?
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What characterizes a postnormal occlusion?
What characterizes a postnormal occlusion?
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In what condition is a reversed overjet commonly observed?
In what condition is a reversed overjet commonly observed?
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How should the upper buccal cusps align with the lower buccal cusps in a normal occlusion?
How should the upper buccal cusps align with the lower buccal cusps in a normal occlusion?
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What defines a posterior crossbite?
What defines a posterior crossbite?
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What is typically indicated by an increased overjet?
What is typically indicated by an increased overjet?
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What occurs in postural prenormal occlusion?
What occurs in postural prenormal occlusion?
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Which of the following best describes a scissor bite?
Which of the following best describes a scissor bite?
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Which feature is relevant when evaluating transverse plane relationships?
Which feature is relevant when evaluating transverse plane relationships?
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What is the definition of a deep overbite?
What is the definition of a deep overbite?
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Which condition describes an open bite?
Which condition describes an open bite?
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How is the assessment of malrelation of the apical bases in the anteroposterior and vertical planes performed?
How is the assessment of malrelation of the apical bases in the anteroposterior and vertical planes performed?
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What characterizes Skeletal Class II malocclusion?
What characterizes Skeletal Class II malocclusion?
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What could potentially cause a deep overbite?
What could potentially cause a deep overbite?
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Which of the following is associated with an open bite?
Which of the following is associated with an open bite?
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What does a telescopic bite refer to?
What does a telescopic bite refer to?
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Which skeletal class indicates a prognathic mandible?
Which skeletal class indicates a prognathic mandible?
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Study Notes
Malocclusion Classification
- Malocclusion is a condition where teeth deviate from their normal positions, either within the same arch or compared to the opposing arch.
- Mal- is a prefix used to signify bad or unpleasant characteristics.
- Normal occlusion involves the line of occlusion passing through the central fossae and the cingulae of the maxillary teeth, and the buccal cusps/incisal edges of the mandibular teeth.
Types of Malocclusion
- Malposition of individual teeth: Teeth are in the wrong position within a normal arch/base. Lischer used the term "version" to describe the malposition in relation to the line of occlusion. Examples of tooth versions include mesioversion, distoversion, labioversion, and buccoversion.
- Malrelation of dental arches: Differences in the position of the dental arches, normally occurring on normally related bases.
- Malrelation of apical bases: Changes in the positioning of the jaws themselves (maxilla and mandible).
Tooth Positions (Tooth Versions)
- Mesioversion: A tooth is tipped or shifted towards the front of the mouth.
- Distoversion: A tooth is tipped or shifted towards the back of the mouth.
- Labioversion: A tooth is tipped or shifted towards the lips.
- Buccoversion: A tooth is tipped or shifted towards the cheeks.
- Palatoversion: A tooth is tipped or shifted towards the palate.
- Linguoversion: A tooth is tipped or shifted towards the tongue.
- Supraversion: A tooth is excessively erupted (erupted above the line of occlusion).
- Infraversion: A tooth is insufficiently erupted (erupted below the line of occlusion).
- Torsiversion: A tooth is rotated.
- Transversion: Teeth are transposed (in the wrong order).
- Imbrications: Teeth are crowded and irregularly placed (often due to a lack of space).
Malrelation of Dental Arches
- Anteroposterior: Evaluation of overjet (normal = 1-3 mm), edge-to-edge bite. Includes Class I (normal relationship), Class II (lower jaw is behind upper jaw), and Class III (lower jaw is ahead of upper jaw).
- Transverse: Evaluation of deviations in midline (both maxillary and mandibular). Includes the concept of crossbites (upper or lower teeth positioning).
- Vertical: Variation in the degree of overbite. Includes deep (or closed) bite (excessive overbite).
Abnormal Positioning/Crossbites
- Scissors Bite: Teeth vertically overlap, but don't touch on touching surfaces.
- Telescopic Bite: One dental arch overlaps the opposing arch completely. This can be either maxillary or mandibular.
- Open Bite: Lack of vertical overlap between upper and lower incisors.
Skeletal Malrelations
- Skeletal Class I: Normal relationship between maxilla and mandible.
- Skeletal Class II: Mandible is behind maxilla.
- Skeletal Class III: Mandible is ahead of maxilla.
Functional Malocclusions
- Occurs when premature contacts cause the mandible to shift to achieve maximum intercuspation. This can lead to anterior or posterior crossbites.
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Description
Explore the complexities of malocclusion, a dental condition that affects the alignment of teeth. This quiz covers the definition of malocclusion, the types of malpositions, and how dental arches relate to each other. Test your knowledge on key terminologies and concepts in dental occlusion.
