Classification of Occlusion Flashcards

Questions and Answers

What is malocclusion?

The lack of a normal relationship between maxillary and mandibular teeth when the jaws are brought together.

Why do we classify occlusion?

To provide a concept of normal occlusion for defining malocclusion, establish criteria, provide a reference system, assist in diagnosis and monitoring, and facilitate communication among dental health care providers.

Malocclusion may be dental, skeletal, or a combination of both.

True

How does the molar relationship in primary dentition affect the occlusion of permanent dentition in a flush terminal plane?

There should be a Class I relationship if primate spaces exist; if not, a Class II relationship may develop. Signup and view all the answers

How does the molar relationship in primary dentition affect the occlusion of permanent dentition in a mesial step?

Should develop into a Class I relationship but may indicate excessive development of the mandible, leading to Class III malocclusion. Signup and view all the answers

How does the molar relationship in primary dentition affect the occlusion of permanent dentition in a distal step?

Should develop into a Class II relationship, with an end-to-end molar relationship at best. Signup and view all the answers

What are the different classifications of occlusion?

Angle's classification, Andrew's six keys of occlusion, Simon's classification, Lischer's nomenclature, and Etiologic Classification. Signup and view all the answers

Which classification system was developed in the 1900s to provide a classification of malocclusion?

Angle classification. Signup and view all the answers

Describe Angle classification.

In the sagittal plane with descriptive elements in the vertical plane. Signup and view all the answers

What is Angle classification based on?

The position of the first permanent maxillary molar. Signup and view all the answers

The Angle classification of malocclusion was later extended to include dental relationships, skeletal jaw relationships, and facial growth patterns.

True Signup and view all the answers

What are the classes of the Angle classification?

Normal, Class I malocclusion, Class II division 1, Class II division 2, Class III. Signup and view all the answers

How is Class I occlusion defined in Angle classification?

Upper and lower molars relate with the mesiobuccal cusp of the upper molar occluding in the buccal groove of the lower molar. Signup and view all the answers

How can Class I occlusion be checked?

By arranging teeth on a smoothly curving line of occlusion and checking for the Class I molar relationship. Signup and view all the answers

Describe the Class I occlusal contacts in Angle's Classification.

Contacts occur between cusp tips and opposing marginal ridges on premolars, and on molars with interactions of cusp tips and fossae. Signup and view all the answers

Study Notes

Malocclusion

Defines as the abnormal relationship between maxillary and mandibular teeth when the jaws are closed.
Indicates how teeth fit together deviating from normal occlusion.

Purpose of Classifying Occlusion

Establishes a benchmark for identifying malocclusion.
Utilizes various criteria and systems for comprehensive assessment.
Facilitates diagnosis, monitoring treatment progress, and evaluating outcomes.
Enhances communication among dental professionals for discussing and comparing occlusion cases.

Types and Nature of Malocclusion

Malocclusion can be dental, skeletal, or a combination of both.
Important for identifying specific characteristics and treatment strategies.

Primary Dentition Influencing Permanent Dentition

Flush terminal plane should ideally develop into Class I relationship with primate spaces present; otherwise, it leads to Class II.
Molar relationships in mesial step typically morph into Class I but may indicate excessive mandibular growth possibly resulting in Class III malocclusion.
Distal step generally results in a Class II relationship at best leading to an end-to-end molar relationship.

Classifications of Occlusion

Various classification systems exist, including:
- Angle's classification
- Andrew's six keys of occlusion
- Simon's classification
- Lischer's nomenclature
- Etiologic classification

Angle Classification System

Established in the 1900s to facilitate diagnosis and treatment planning for malocclusion.
Focuses on the position of the first permanent maxillary molar.
Originally featured sagittal plane elements with vertical plane considerations.

Classes in Angle's Classification

Normal occlusion: Class I molars aligned on the line of occlusion.
Class I malocclusion: Misaligned teeth but maintaining normal molar relationship.
Class II division 1 and division 2: Variations of Class II relationship characterized by specific dental alignments.
Class III: Involves a different alignment typically characterized by prognathism.

Class I Occlusion in Detail

Defined by specific relationships between upper and lower molars, particularly the alignment of cusps within defined grooves.
Mesiobuccal cusp of the maxillary first molar articulates with the buccal groove of the mandibular first molar, establishing a functional occlusal pattern.
Class I occlusion can be validated through proper tooth arrangement following a smooth curve.

Occlusal Contacts in Class I

Premolar contacts arise between cusp tips and opposing marginal ridges.
Molar contacts involve both cusp tips and fossae as well as marginal ridges.
Centric cusps contact central fossa areas and marginal ridges and each tooth must occlude with its counterpart and adjacent teeth.

Class I Malocclusion Characteristics

Despite misalignment of teeth, a typical molar relationship is maintained.

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Description

This set of flashcards focuses on the classification of normal occlusion and malocclusion. It covers key definitions and concepts that are essential for understanding how teeth fit together. Ideal for dental students and professionals looking to reinforce their knowledge on occlusion.