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Orthodontic Terminology Lecture 3 Quiz

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Questions and Answers

What is the definition of overbite?

No vertical contact between maxillary and mandibular posterior teeth

Divergence of the skeletal mandibular or maxillary planes

Horizontal overlap of the incisors

Vertical overlap between the maxillary and mandibular incisors (correct)

What is the definition of overjet?

Localized open bite involving only a few teeth

Vertical overlap between the maxillary and mandibular incisors

Horizontal overlap of the incisors (correct)

Increased facial height due to divergence of skeletal planes

What is an open bite (Negative overbite) characterized by?

Horizontal overlap of the incisors

Vertical overlap between the maxillary and mandibular incisors

Inherited, developmental, or acquired malocclusion with no vertical overlap (correct)

Divergence of the skeletal mandibular or maxillary planes

What causes a dental open bite?

A localized open bite involving only a few teeth due to habits or other factors (C) Signup and view all the answers

What causes a skeletal open bite?

Increased facial height due to divergence of skeletal planes (B) Signup and view all the answers

What is the normal vertical overlap between the maxillary and mandibular incisors?

1 to 2 mm overbite (D) Signup and view all the answers

What is the ideal range of vertical overlap for the anterior teeth?

2-4 mm (D) Signup and view all the answers

In which type of malocclusion does the vertical overlap of the anterior teeth exceed the normal range?

Deep bite (A) Signup and view all the answers

What is the term used to indicate the distance between the buccal surfaces of the maxillary posterior teeth and their mandibular antagonists?

Buccal overjet (C) Signup and view all the answers

What is the term for an abnormal relationship of one or more teeth to one or more teeth of the opposing arch, in the buccolingual or labiolingual direction?

Buccal crossbite (A) Signup and view all the answers

Which type of crossbite is mainly due to a narrow maxillary arch?

Maxillary posterior lingual crossbite (D) Signup and view all the answers

If one or more of the lower incisors are in front of the upper incisors, what is this condition called?

Reverse overjet (D) Signup and view all the answers

Study Notes

Occlusion and Malocclusion

Overbite refers to the vertical overlap between the maxillary and mandibular incisors.
Overjet refers to the horizontal distance between the maxillary and mandibular incisors.

Open Bite (Negative Overbite)

Characterized by a lack of vertical overlap between the maxillary and mandibular incisors.

Causes of Open Bite

Dental open bite: caused by abnormal eruption patterns or habits such as thumb-sucking.
Skeletal open bite: caused by a discrepancy in the size or shape of the maxilla and mandible.

Normal Vertical Overlap

Normal vertical overlap between the maxillary and mandibular incisors is 3-5 mm.
Ideal range of vertical overlap for the anterior teeth is 2-4 mm.

Deep Bite

Characterized by a vertical overlap of the anterior teeth that exceeds the normal range.

Terms in Occlusion

The term "buccal clearance" refers to the distance between the buccal surfaces of the maxillary posterior teeth and their mandibular antagonists.
"Crossbite" refers to an abnormal relationship of one or more teeth to one or more teeth of the opposing arch, in the buccolingual or labiolingual direction.

Types of Crossbite

A narrow maxillary arch can cause a posterior crossbite.
An anterior crossbite occurs when one or more of the lower incisors are in front of the upper incisors.