Dental Prosthetics: Articulation and Analysis

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Questions and Answers

What is a disadvantage of small nonadjustable articulators in dental prosthetics?

They are designed to mimic the patient's condylar path.

They may lead to restorations with occlusal interferences. (correct)

They accurately reproduce full mandibular movement.

They require excessive time and expertise to use.

What characteristic is true for semiadjustable articulators?

They require excessive clinical adjustments during treatment.

They have rigid attachment between upper and lower members.

They are suitable for most routine fixed prostheses. (correct)

They do not require adjustments to mimic patients' condylar paths.

Which design feature distinguishes arcon design from nonarcon design in articulators?

A rigid connection between upper and lower members.

The ability to adjust for patient-specific condylar inclination.

Condylar spheres on the upper component.

Condylar spheres on the lower component. (correct)

Which of the following is a benefit of using small nonadjustable articulators?

They require minimal adjustments during procedures. Signup and view all the answers

What is a common issue associated with the use of small nonadjustable articulators?

Hinge closure issues due to anatomical differences. Signup and view all the answers

What is the primary purpose of utilizing a centric relation interocclusal record?

To accurately position the mandibular cast Signup and view all the answers

How should condylar elements be set during mandibular cast articulation?

Utilizing protrusive and excursive interocclusal records Signup and view all the answers

What does the term 'anterior guidance' refer to in occlusal relationship analysis?

The influence of anterior teeth on posterior disclusion Signup and view all the answers

Which statement best describes centric relation?

It is an unstrained position of the mandible within the glenoid fossae Signup and view all the answers

What is evaluated during occlusal plane analysis?

The influence of anterior guidance on posterior teeth Signup and view all the answers

What is an advantage of using a supragingival margin in tooth preparation?

Impressions can be made more easily. Signup and view all the answers

Which of the following statements about supragingival and subgingival margins is true?

Supragingival margins are more easily evaluated during placement. Signup and view all the answers

Which guideline is NOT a part of conserving tooth structure in tooth preparation?

Ensuring the preparation is visible at recall visits. Signup and view all the answers

What is a key consideration when placing margins for tooth preparation?

The placement should consider minimizing soft tissue trauma. Signup and view all the answers

What is a potential disadvantage of a subgingival margin in tooth preparation?

They are less likely to become plaque free. Signup and view all the answers

Study Notes

Centric Relation Record

Ensures accurate spatial orientation of the mandible in relation to the maxilla
The condyles are in their most upward, backward, and unstrained position within the glenoid fossae

Conylar Element Setting

Utilize centric relation interocclusal record for mandibular cast articulation
Set condylar elements using protrusive and excursive interocclusal records

Occlusal Plane Analysis

Evaluates anterior guidance and its influence on posterior disclusion
Provides diagnostic information for occlusal relationships in dental prosthetics

Articulator Selection

Proper articulator selection can significantly impact treatment outcomes and efficiency

Non Adjustable Articulators

Practical Approach: Suitable for most routine fixed prostheses
Minimal Adjustments: Reduces need for clinical adjustments during treatment
Limited Accuracy: Cannot reproduce full range of mandibular movement
Occlusal Discrepancies: May lead to restorations with occlusal interferences

Semiadjustable Articulators

Anatomical Accuracy: Size similar to anatomic structures they represent
Hinge Closure Issues: Distance between hinge and tooth is less than in patients
Time-Efficient: Does not require excessive time or expertise to use

Arcon vs Nonarcon Designs

Arcon Design: Condylar spheres on lower component, anatomically "correct" design
Nonarcon Design: Condylar inclination adjusts to mimic patient's condylar path, popular in complete denture prosthodontics

Semiadjustable Articulator Adjustments

Rigidly attached upper and lower members
Compatible with other principles of tooth preparation

Biological Considerations

Tooth structure is conserved through adherence to the following guidelines:
Avoidance of unnecessary apical extension of the preparation

Margin Placement

Supragingival Margin: Can be easily finished without associated soft tissue trauma, easily kept plaque free, easier to make impressions
Subgingival Margin: More easily evaluated at the time of placement, can extend to the gingival crest, more retention and/or resistance is needed
Metalceramic crown margin should be hidden behind the labiogingival crest
Root sensitivity cannot be controlled by conservative procedures, such as dentin bonding agents

Mechanical Considerations

Recommended convergence between opposing walls is 6 degrees
Surface area retention form of an excessively tapered preparation can be increased by adding grooves
Stress concentration Sharp occlusoaxial line angles should be rounded
Type of preparation have different retentive values
The internal surface of a restoration is smooth, retentive failure occurs at the cement-restoration interface
Retention of a complete crown is more than double that of partial coverage restorations

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Description

This quiz covers key concepts in dental prosthetics, focusing on techniques such as centric relation records, condylar element settings, and occlusal plane analysis. Understanding these principles is vital for effective articulator selection and treatment outcomes. Test your knowledge on the intricacies of mandibular and maxillary relationships in dentistry.