Centric Position Concepts in Dentistry

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Questions and Answers

What is the primary characteristic of unilateral balanced occlusion?

All teeth on the non-working side are in contact.

Maximum contact occurs on both working and non-working sides.

All teeth on the working side are in contact during lateral excursion. (correct)

No contact is allowed on the working side.

In mutually protected occlusion, what is the result of the overlap of anterior teeth?

Prevented contact of posterior teeth during excursions. (correct)

Increased contact during protrusion.

No contact allowed for anterior teeth.

Maximized contact during lateral movements.

What is required for maximum contact in centric occlusion?

Only the posterior teeth should contact.

All natural teeth must be in contact. (correct)

Only the anterior teeth must touch.

There must be at least two points of contact.

In bilateral balanced occlusion, what side experiences destructive obliquely directed forces?

The balancing side. Signup and view all the answers

What is a key feature of group function in unilateral balanced occlusion?

Maximum contact occurs on the working side with no contact in the non-working side. Signup and view all the answers

Which type of occlusion prevents contact during lateral excursions for both working and non-working sides?

Mutually protected occlusion. Signup and view all the answers

During protrusion in mutually protected occlusion, what is expected in terms of contact?

No contact at all. Signup and view all the answers

What percentage of natural teeth coincides with the point centric concept?

10% Signup and view all the answers

Which of the following describes centric relation?

The relationship between mandible and maxilla when condyles are in an uppermost position. Signup and view all the answers

What does the term 'slide in centric' refer to?

The movement from centric relation to intercuspal position. Signup and view all the answers

What is the main characteristic of freedom of centric?

It creates a relatively flat area between centric relation and centric occlusion. Signup and view all the answers

What does bilateral balanced occlusion dictate for the contact of teeth?

A maximum number of teeth should contact in all excursive positions. Signup and view all the answers

Which occlusal concept is primarily used in complete denture construction?

Bilateral balanced occlusion Signup and view all the answers

Which of the following concepts is associated with 'group function'?

Unilateral balanced occlusion Signup and view all the answers

What defines maximal intercuspation?

The best fit of teeth regardless of condylar position. Signup and view all the answers

Study Notes

Centric Position Concepts

Point centric: Maximum intercuspation (centric occlusion) coincides with centric relation. This occurs in about 10% of natural teeth and is applied in complete dentures.
Centric Relation: Maxilla to mandible relationship with condyles and disks in the midmost and uppermost position in the glenoid fossae against the distal slope of the articular eminence.
Maximal Intercuspation (Centric Occlusion): Complete intercuspation of opposing teeth regardless of condylar position.
Slide in Centric: About 90% of individuals with natural dentition have a slide in centric. It's the two or three-dimensional sliding movement the mandible makes as it moves from centric relation to intercuspal position.
Freedom of Centric (Long Centric or Broad Centric): A relatively flat area between centric relation and centric occlusion positions on the occlusal surfaces of the teeth. It is created in natural teeth through occlusal adjustment and can be created in complete dentures using cuspless teeth.

Organization of Occlusion

There are three main concepts that describe the manner in which teeth contact in functional and excursive positions of the mandible.
- Bilateral Balanced Occlusion: Maximum number of teeth contact in all excursive positions. This can be useful in complete denture construction but can subject natural teeth to destructive obliquely directed forces.
- Unilateral Balanced Occlusion (Group Function): All teeth on the working side contact during a lateral excursion, while teeth on the non-working side are contoured to have no contact.
- Mutually Protected Occlusion: Also known as canine protected occlusion, canine rise, or organic occlusion. This arrangement prevents posterior teeth from contacting during mandibular excursions by using the overlap of the anterior teeth. This is also known as disclusion.

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Description

This quiz covers the key concepts of centric positions in dentistry, including definitions of centric relation, maximal intercuspation, and the slide in centric. Explore how these concepts apply to natural dentition and complete dentures.