Dental Occlusion Quiz

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Questions and Answers

What defines the non-working side of the mandible during lateral movements?

Teeth on this side make contact with other teeth.

It is the side that performs the majority of the work.

It is the side that moves towards the midline. (correct)

Teeth on this side experience increased load during movement.

Which occlusal scheme involves anterior teeth protecting posterior teeth during lateral movements?

Unilateral Balanced Occlusion

Canine Guidance (correct)

Group Function

Bilateral Balanced Occlusion

In Bilateral Balanced Occlusion, what occurs during centric occlusion?

There are simultaneous contacts on both sides with no interferences. (correct)

Teeth on the non-working side remain disconnected at all times.

Only the working side teeth make contact.

There is a focus on load distribution exclusively on the anterior teeth.

What disadvantage is associated with Unilateral Balanced Occlusion?

Non-axial loads on posterior teeth during lateral movements. Signup and view all the answers

What is a primary characteristic of Mutually Protected Occlusion?

It minimizes risk of damage to teeth and surrounding structures. Signup and view all the answers

What advantage does tooth setup offer over BBO?

It's easier to perform Signup and view all the answers

What does lingualized occlusion primarily eliminate?

Buccal cusp contacts Signup and view all the answers

What phenomenon occurs during protrusive movement in natural dentition?

Posterior teeth separate Signup and view all the answers

What is the primary purpose of the denture try-in appointment?

To verify fit, function, esthetics, and phonetics Signup and view all the answers

What should be checked first during the try-in appointment?

The color and mold of the teeth Signup and view all the answers

Which aspect of tooth setup helps in achieving bilateral balanced occlusion?

Buccal cusps of upper and lower denture contact Signup and view all the answers

Why is modifying the denture during the try-in appointment necessary?

It reduces the likelihood of dissatisfaction Signup and view all the answers

What results from improper remounting of models in a denture try-in?

Incorrect tooth placement Signup and view all the answers

What should be done if the try-in is not fully acceptable to the patient?

Change the midline or arch form if necessary. Signup and view all the answers

Which of the following is NOT recommended before the try-in appointment?

Decide on changes without consulting the patient. Signup and view all the answers

What is the primary purpose of the try-in appointment?

To check the fit and make necessary adjustments. Signup and view all the answers

During the try-in, how should the retention of the denture be regarded?

It may be compromised but should allow focus on the teeth. Signup and view all the answers

What aspect of the maxillary anterior teeth should align with the lower lip for optimal esthetics?

Curvature. Signup and view all the answers

How long can a try-in last based on the assessment of various factors?

10 minutes to more than an hour. Signup and view all the answers

Which of the following factors should be checked during the intra-oral try-in?

The comfort and retention of the denture base. Signup and view all the answers

What should the patient be informed of about the wax try-ins?

The wax is only for evaluation, not for chewing. Signup and view all the answers

What should be done if both denture bases are found to be unstable during assessment?

Use double base stabilization Signup and view all the answers

What is the purpose of carving the posterior palatal seal (PPS) into the master model?

To compensate for polymerization shrinkage Signup and view all the answers

If a major discrepancy is discovered during the try-in appointment, what action is necessary?

Conduct a clinical remount Signup and view all the answers

Which factor is NOT considered when selecting the denture base shade?

Patient’s oral hygiene Signup and view all the answers

What needs to be clarified if the posterior palatal seal was not defined in the definitive impression?

The PPS groove should be defined Signup and view all the answers

When teeth are interfering during the bite recording, what should be done first?

Remove the interfering teeth Signup and view all the answers

Which shade category is NOT included in common denture base shade selections?

Bright white Signup and view all the answers

What should be done if the heels of the denture bases are contacting?

Correct the heel clash Signup and view all the answers

What is the primary role of complete denture occlusion?

To provide functional stability and comfort Signup and view all the answers

What defines maximum intercuspation?

The complete intercuspation of opposing teeth regardless of condylar position Signup and view all the answers

Which movement does protrusion refer to?

Moving the lower jaw forward from a stable position Signup and view all the answers

What is meant by laterotrusion?

A lateral movement of the mandible toward one side Signup and view all the answers

Which best describes centric relation?

A joint position independent of tooth contact Signup and view all the answers

How does occlusion differ from articulation?

Occlusion involves tooth contact, whereas articulation involves mandibular movements Signup and view all the answers

What is the role of the working side during lateral movements?

The side that moves away from the midline during laterotrusion Signup and view all the answers

Which occlusal scheme emphasizes stability during function?

Balanced occlusion Signup and view all the answers

What is the purpose of asking a patient to count from 50 to 55 during a speaking assessment?

To evaluate the position of maxillary teeth relative to the lower lip Signup and view all the answers

What does a significant change in Freeway Space (FWS) indicate?

Necessary adjustment of tooth setup Signup and view all the answers

What should be assessed when the patient produces the 's' sound during a speaking assessment?

Contact between maxillary and mandibular teeth Signup and view all the answers

When assessing Vertical Dimension of Occlusion (OVD), what must be ensured?

Wax rims are in close occlusion Signup and view all the answers

What does it indicate if the upper and lower teeth are either both excessively visible with sibilants?

Adjustment of the occlusal plane is warranted Signup and view all the answers

What should be avoided when instructing the patient during the occlusion assessment?

Asking the patient to close without biting Signup and view all the answers

What is a likely consequence if OVD is too low during assessment?

Drooling at the corner of the mouth Signup and view all the answers

What does the closest speaking space refer to?

1-2mm gap between maxillary and mandibular teeth Signup and view all the answers

Study Notes

Denture Occlusal Schemes and Try-in Appointment

The lecture covers complete denture occlusal schemes, including natural occlusion, balanced occlusion, unbalanced occlusion, and the wax try-in appointment.
Natural occlusion, balanced occlusion, and unbalanced occlusion are different schemes used in natural teeth to distribute forces efficiently during chewing and prevent damage to teeth.
Complete denture schemes aim for similar advantages, such as maintaining stability, improving chewing efficiency, preserving residual ridges, and improving patient comfort.
Balanced occlusion limits tipping during functional movements, maximizing stability. This includes bilateral balanced, lingualized, and monoplane occlusion.
Monoplane occlusion is characterized by flat, non-anatomic teeth without cusp inclines to eliminate horizontal forces and minimize lateral interferences. The scheme eliminates nonaxial forces on the denture.
Lingualized occlusion features maxillary lingual cusps contacting mandibular occlusal surfaces. It maximizes stability and esthetics.
Bilateral balanced occlusion involves simultaneous, evenly distributed contacts between upper and lower teeth on both working and non-working sides, ideal for complete dentures to enhance stability and prevent dislodgement.
The try-in appointment verifies fit, function, esthetics, and phonetics. It helps to adapt or modify the denture.

Important Terms

Maximum Intercuspation: The position where opposing teeth fit together in their most stable and tightest contact. Often referred to as the habitual bite or centric occlusion. This doesn't depend on condylar position.
Centric Relation: A maxillomandibular relationship where the condyles are positioned in their most superior, anterior position within the glenoid fossa, resting against the thinnest, avascular portion of the articular disc. This position is repeatable and not dependent on tooth contact.
Occlusion vs Articulation: Occlusion is the static relationship between maxillary and mandibular teeth when they are in contact. Articulation is the dynamic relationship during mandibular movements like lateral or protrusive.
Protrusion: A mandibular movement where the lower jaw moves forward from centric relation or maximum intercuspation.
Laterotrusion: A lateral movement of the mandible toward one side (working side) during mandibular function like chewing.
Working Side: The side of the mandible that moves away from the midline during laterotrusion, with teeth often making contact.
Non-Working Side (Balancing Side): The side of the mandible that moves towards the midline during laterotrusion, with minimal or no tooth contact.

Occlusal Schemes in Natural Teeth

Mutually Protected Occlusion: Anterior teeth protect posterior teeth during excursive movements (lateral and protrusive) and posterior teeth protect anterior during centric occlusion.
Unilateral Balanced Occlusion: Multiple teeth on the working side share the load during lateral movement, the non-working side has no contact.
Bilateral Balanced Occlusion: Simultaneous, evenly distributed contacts occur between upper and lower teeth during all mandibular movements.

Christensen's Phenomena

Christensen's phenomenon describes the separation of posterior teeth in both maxilla and mandible when the mandible moves into a forward (protrusive) position due to the downward and forward movement of the mandibular condyles.

Dentist Procedures and patient assessment

The try-in appointment gives the first opportunity for dentist and patient to see the denture and decide whether to accept, modify or change.
Check teeth color, mold, and best position during try-in.
Assess alignment and any small improvements for patient.
Check for tongue and lip support and adjustments.
The try-in appointment has three possible conclusions: satisfaction, need for modification, or difficulty to satisfy both patient/dentist.
The order of priority for information evaluation is fit, function, esthetics, and phonetics.
Assess the wax-up for relaxed jaw posture, protrusive posturing, tooth characterization, gingival color, any other concerns, spouse/others satisfaction, and complete the details with other important oral evaluations, such as VDO.
If both patient/dentist are satisfied, the denture can be processed. If not, posterior palatal seal must be considered for definitive impression when needed.
Carving the posterior palatal seal can help compensate polymerization shrinkage, preserve peripheral seal, and blend into the mucosal contour.
If the lower denture is not stable, single base stabilization should be used. If both denture bases are not stable, use double base stabilization.
A clinical remount is needed if there's a major discrepancy, and teeth causing interference may need removal before bite recording. The bite can be recorded at the same or increased OVD.
Consider the patient's age, ethnicity, complexion, and gingival pigmentation to determine the proper shade. Common shades include light pink, medium pink, dark pink, and pigmented shades.

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Description

Test your knowledge on dental occlusion concepts and terminology. This quiz covers various occlusal schemes, their advantages, disadvantages, and critical characteristics. Perfect for dental students and professionals looking to refresh their understanding.