Malocclusion Classification Overview
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Questions and Answers

Which term describes a tooth that is tipped towards the mesial position?

  • Mesioversion (correct)
  • Distoversion
  • Buccoversion
  • Linguoversion

What does the term 'Supraversion' indicate regarding a tooth's position?

  • The tooth is rotated on its long axis.
  • The tooth has erupted past the line of occlusion. (correct)
  • The tooth is positioned towards the lip.
  • The tooth is displaced distally.

In orthodontics, which malocclusion occurs due to irregular placement of teeth in the dental arch?

  • Infraversion
  • Torsiversion
  • Transversion
  • Imbrications (correct)

Which plane is used to describe anterior-posterior relationships in the context of dental arches?

<p>Sagittal Plane (C)</p> Signup and view all the answers

What condition describes a tooth that is short of the line of occlusion?

<p>Infraversion (B)</p> Signup and view all the answers

Which term refers to a tooth that is rotated on its long axis?

<p>Torsiversion (B)</p> Signup and view all the answers

What is the primary characteristic of a tooth in 'Distoversion'?

<p>The tooth is tipped or displaced distally. (D)</p> Signup and view all the answers

Which type of malocclusion arises from the wrong order of teeth position in the arch?

<p>Transversion (D)</p> Signup and view all the answers

What characterizes a postnormal occlusion?

<p>The lower dental arch is too far distally compared to the upper dental arch. (D)</p> Signup and view all the answers

In what condition is a reversed overjet commonly observed?

<p>Prenormal occlusion. (C)</p> Signup and view all the answers

How should the upper buccal cusps align with the lower buccal cusps in a normal occlusion?

<p>Upper buccal cusps should overlap the lower buccal cusps. (A)</p> Signup and view all the answers

What defines a posterior crossbite?

<p>One or more posterior teeth occlude in an abnormal relation with their antagonist. (D)</p> Signup and view all the answers

What is typically indicated by an increased overjet?

<p>Postnormal occlusion. (B)</p> Signup and view all the answers

What occurs in postural prenormal occlusion?

<p>The mandible is postured forward relative to the upper arch. (C)</p> Signup and view all the answers

Which of the following best describes a scissor bite?

<p>Several adjacent posterior teeth overlap without contact. (A)</p> Signup and view all the answers

Which feature is relevant when evaluating transverse plane relationships?

<p>The evaluation of crossbite. (B)</p> Signup and view all the answers

What is the definition of a deep overbite?

<p>When the overbite is excessive and results from supraposition of the anterior teeth (A)</p> Signup and view all the answers

Which condition describes an open bite?

<p>Absence of vertical overlap of the upper and lower incisors (A)</p> Signup and view all the answers

How is the assessment of malrelation of the apical bases in the anteroposterior and vertical planes performed?

<p>Using radiographic analysis of lateral cephalometric X-rays (B)</p> Signup and view all the answers

What characterizes Skeletal Class II malocclusion?

<p>Mandible in a postnormal position relative to the maxilla (D)</p> Signup and view all the answers

What could potentially cause a deep overbite?

<p>Supraposition of the anterior teeth (C)</p> Signup and view all the answers

Which of the following is associated with an open bite?

<p>No vertical overlap of upper and lower incisors (C)</p> Signup and view all the answers

What does a telescopic bite refer to?

<p>A complete maxillary buccal or mandibular lingual crossbite (D)</p> Signup and view all the answers

Which skeletal class indicates a prognathic mandible?

<p>Skeletal Class III (A)</p> Signup and view all the answers

Flashcards

What is malocclusion?

A condition where the normal alignment of teeth within the same arch or opposing arches is disrupted.

Mesioversion

A tooth positioned mesially (towards the front) compared to its normal position.

Distoversion

A tooth positioned distally (towards the back) compared to its normal position.

Labioversion

A tooth that is tipped or shifted labially (towards the lips).

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Buccoversion

A tooth that is tipped or shifted buccally (towards the cheeks).

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Palatoversion

A tooth that is tipped or shifted palatally (towards the roof of the mouth).

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Linguoversion

A tooth that is tipped or shifted lingually (towards the tongue).

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Supraversion

A tooth that has erupted past the normal line of occlusion, appearing higher than its neighbors.

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Deep Overbite

An overbite where the upper teeth excessively cover the lower teeth, potentially due to an overgrowth of the upper teeth or an undergrowth of the lower teeth.

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Open Bite

An overbite where the upper and lower front teeth do not overlap at all, potentially due to an undergrowth of the upper teeth or an overgrowth of the lower teeth.

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Skeletal Class I

A classification of skeletal jaw relationship where the upper and lower jaws are in a normal anteroposterior relationship. The front teeth and jaw bones are aligned.

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Skeletal Class II

A classification of skeletal jaw relationship where the lower jaw is behind the upper jaw, potentially due to an undergrowth of the lower jaw or an overgrowth of the upper jaw.

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Skeletal Class III

A classification of skeletal jaw relationship where the lower jaw is in front of the upper jaw, potentially due to an overgrowth of the lower jaw or an undergrowth of the upper jaw.

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Functional Malocclusion

A condition where, to achieve correct bite, the jaw has to shift from its normal position due to premature contact between the teeth.

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Transverse Plane

A transverse plane, also known as an axial or horizontal plane, is an imaginary plane that divides the head into upper and lower halves, perpendicular to the sagittal and frontal planes.

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Overjet

The overjet is the horizontal distance between the upper and lower incisors when the teeth are in centric occlusion. It's measured in millimeters.

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Class I Molar Relationship

In a Class I molar relationship, the upper first molar is positioned directly over the lower first molar.

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Postnormal Occlusion

Postnormal occlusion occurs when the lower jaw is too far back (posteriorly) in relation to the upper jaw. This often results in an increased overjet.

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Prenormal Occlusion

Prenormal occlusion is when the lower jaw is positioned too far forward (mesially) in relation to the upper jaw. This often leads to a reversed overjet.

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Midline

The midline is the imaginary line that runs down the middle of the face, dividing it into two halves.

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Posterior Crossbite

A crossbite occurs when one or more posterior teeth are positioned abnormally, with the upper tooth on the inside (lingual) or the lower tooth on the outside (buccal).

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Scissors Bite

Scissors bite is a type of malocclusion where several adjacent posterior teeth overlap vertically in habitual occlusion, but their occlusal surfaces don't touch.

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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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Malocclusion Classification PDF

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.

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