Angle's Classification Quiz - Test Your Knowledge

Questions and Answers

What may a distal step terminal plane relationship indicate?

No impact on dental structure

An increase in dental hygiene

Deficiency in the development of the mandible (correct)

A perfect Class I relationship

What are the effects of malocclusion? (Select all that apply)

Negative self-image (correct)

Improved oral hygiene

Increased risk for periodontal disease (correct)

Possible TMJ pain (correct)

What is premature contact in dentistry?

When one tooth hits before or more than any other.

What is anterior coupling?

The touching of the anterior teeth prematurely to the posterior teeth during centric occlusion. Signup and view all the answers

What problems can occur with premature contact?

TMJ pain, sore muscles of mastication, tooth sensitivity, and potential mobile teeth. Signup and view all the answers

What enables the primary teeth to take their position? (Select all that apply)

The eruption pattern Signup and view all the answers

What is the development of occlusion initiated by?

Eruption of primary teeth Signup and view all the answers

What is alignment in dentistry?

How teeth are arranged in a row Signup and view all the answers

What is intercuspation?

How the upper teeth will touch, hit and interlock with the lower teeth Signup and view all the answers

At what age is the primary dentition usually completed?

2.5 years Signup and view all the answers

The average overjet of primary dentition is?

3 mm Signup and view all the answers

The average overbite of primary dentition is?

2.5 mm Signup and view all the answers

What classification is used for primary occlusion?

Terminal Plane Relationship Signup and view all the answers

What defines the terminal plane relationship?

Based on the relationship between the distal surfaces of the primary maxillary and mandibular second molars Signup and view all the answers

What happens during the closing of the primary (primate) space?

Allows room for the lower molars to move mesially Signup and view all the answers

What do primate spaces refer to?

Larger spaces found mesial to the maxillary primary canines and distal to the mandibular canines Signup and view all the answers

What defines class I occlusion?

Mesiobuccal cusp of maxillary first molar occludes with the mesiobuccal groove of mandibular first molar Signup and view all the answers

Is it possible for both sides of the mandible to be in different classes?

Yes Signup and view all the answers

How is horizontal overlap or overjet measured?

Both A and B Signup and view all the answers

What is the freeway space in dentistry?

The space between the occlusal surfaces of the posterior teeth Signup and view all the answers

In Angle's classification, what teeth are primarily used for assessment?

Mandibular and maxillary permanent first molars Signup and view all the answers

What is defined as class II malocclusion?

The mesiobuccal groove of the mandibular first permanent molar is distal to the mesiobuccal cusp of the maxillary first permanent molar Signup and view all the answers

What is class II Division 1 characterized by?

Maxillary incisors protrude facially from the mandibular incisors Signup and view all the answers

What indicates a Class III malocclusion?

The mandible is protruded and has a mesial relationship with the maxilla Signup and view all the answers

The primary dentition erupt in a more upright position than permanent teeth.

True Signup and view all the answers

What is defined as occlusion?

The relationship of the mandibular and maxillary teeth when they are closed together Signup and view all the answers

Study Notes

Occlusion and Angle's Classification

Development of occlusion starts with primary teeth eruption influenced by tooth bud formation, eruption patterns, and facial development.
Primary dentition typically completes by 2.5 years of age and erupts in a more upright position than permanent teeth.
Average overjet of primary dentition is approximately 3mm, while the average overbite measures around 2.5mm.

Terminal Plane Relationship

Primary occlusion is classified using Terminal Plane Relationship, based on the alignment of distal surfaces of maxillary and mandibular second molars.
Types of Terminal Plane Relationships include:
- Mesial Step: Mandibular second molar is mesially positioned relative to the maxillary molar; most common scenario.
- Flush or Straight: Distal surfaces of both molars align evenly.
- Distal Step: Mandibular molar is positioned distally; least common.

Dental Spaces and Growth Factors

During growth, jaws expand, leading to larger spaces between teeth despite teeth remaining the same size.
Primate Spaces are larger spaces by canine areas, aiding in Class I occlusion.
Leeway Spaces occur when wider primary molars are replaced by narrower premolars, contributing to space for proper dental alignment.

Factors Influencing Occlusion

Occlusion can be influenced by jaw development, muscle activity, genetics, as well as habits like thumb sucking.
Horizontal and vertical alignment are affected by the position of lips, cheeks, and tongue, as well as intercuspation.

Angles Classification and Occlusal Relationships

Angle's Classification is the most recognized system for classifying occlusion, primarily involving permanent first molars.
Patients can present differing angle classifications on each side of the mouth.
Class I Occlusion: Mesiobuccal cusp of maxillary first molar aligns with the mesiobuccal groove of the mandibular first molar.
Class II Malocclusion: Mandibular molar is positioned more posterior; includes two divisions:
- Division 1: Protruded maxillary incisors.
- Division 2: Inclined or retruded incisors.
Class III Malocclusion: Mandible is protruded with a prognathic profile.

Anterior Occlusion Characteristics

Overjet is the horizontal overlap of maxillary teeth over mandibular teeth.
Overbite is the vertical overlap, categorized as slight, moderate, or severe, based on the vertical position of maxillary incisors in relation to mandibular incisors.

Facial Profiles and Dental Classification

Facial profiles associated with the classifications include:
- Class I: Mesognathic profile, normal relationship between maxilla and mandible.
- Class II: Retrognathic profile; smaller mandible leads to facial recession.
- Class III: Prognathic profile, larger mandible compared to maxilla.

Malocclusion Effects

Malocclusion can lead to negative self-image and complicate oral hygiene, increasing risk for periodontal disease and temporomandibular joint (TMJ) issues.
Premature contacts refer to situations where one tooth hits before or harder than others, potentially leading to jaw misalignment and discomfort.

Important Curvature

The Curve of Spee is a lateral curvature from anterior to posterior in the mandibular arch.
Curve of Wilson describes the transverse occlusal curve for posterior teeth.
Sphere of Monson is a three-dimensional curve combining the Curves of Spee and Wilson.

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Description

This quiz focuses on the principles of occlusion and Angle's classification. It covers the primary teeth's eruption sequence and its impact on occlusion development. Ideal for students studying dental anatomy and orthodontics.

LO7 - Occlusion - Angle's Classification Quiz