Dental Prosthetics Overview

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Questions and Answers

What is a disadvantage of high frenal attachment in dental appliances?

It facilitates better esthetics.

It stabilizes periodontally weakened teeth.

It limits space for a lingual bar. (correct)

It enhances retention support.

Which of the following is a consequence of non-utilization of the cleansing action of saliva in dental applications?

Enhanced esthetic consideration.

Increased comfort during use.

Decreased risk of caries and periodontal disease.

Reduced physiologic stimulation from food. (correct)

In which case is an interrupted lingual plate used?

To provide additional retention support.

When there are minor interdental spaces.

To increase the occlusal stability.

When large interdental spaces make it unsightly. (correct)

What is a potential risk if a dental appliance is not properly designed?

It could cause more harm than good. Signup and view all the answers

What primary function does a double lingual bar serve?

To deflect food from interproximal surfaces. Signup and view all the answers

Which condition would require a dental practitioner to consider the use of a terminal rest?

Presence of excess vertical resorption. Signup and view all the answers

How does a high tendency for calculus formation affect dental appliance design?

It necessitates modifications to ensure health. Signup and view all the answers

Which of the following indicates a potential complication in the presence of bony and tissue undercut?

Limited space availability for appliances. Signup and view all the answers

What is the simplest type of mandibular major connector?

Lingual bar Signup and view all the answers

Which condition indicates the use of a lingual bar instead of a lingual plate?

Absence of pedunculated torus Signup and view all the answers

What configuration should a lingual bar ideally have in cross-section?

One half pear shape Signup and view all the answers

What is the appropriate space from the lingual frenum to utilize a lingual bar?

8-10 mm Signup and view all the answers

In which scenario would a lingual plate be preferred over a lingual bar?

When there are 8 or more anterior teeth Signup and view all the answers

What type of force can a lingual torus create against a major connector?

Impinging force Signup and view all the answers

What should be the design consideration for the upper anterior border of a lingual plate?

Ideal to be placed in the middle third of the lingual surface Signup and view all the answers

Which of the following is a contraindication for the use of a lingual bar?

Presence of high lingual frenum attachment Signup and view all the answers

What is the primary benefit of using a palatal strap connector?

It rarely causes discomfort and does not interfere with speech. Signup and view all the answers

In which scenario is a double palatal connector recommended?

In situations with minimal need for palatal support. Signup and view all the answers

What is a key feature of the palatal horseshoe connector?

It is least favorable due to its flexibility. Signup and view all the answers

What is the recommended anterior strap width for a double palatal connector?

8-10 mm Signup and view all the answers

What factor is considered when determining the width of a palatal strap?

The length of the edentulous area and support required. Signup and view all the answers

What is an important consideration for patients regarding the palatal horsehoe design?

It should allow for flexibility in movement without discomfort. Signup and view all the answers

What should be avoided when designing the anterior border of a palatal horseshoe?

Constructing it in a narrow and thick manner. Signup and view all the answers

Why might a dental professional choose a double palatal connector in certain cases?

It effectively addresses anterior palatal corrections. Signup and view all the answers

What is the function of the gingival relief area in a palatal connector?

To prevent food impaction. Signup and view all the answers

Which condition is NOT an indication for using a palatal horseshoe connector?

Minimal edentulous areas. Signup and view all the answers

Study Notes

High Frenal Attachment and Lingual Bar Considerations

High frenal attachment limits space for lingual bars, requiring careful design.
Terminal rests must be placed on occlusal, lingual, or incisal surfaces for stability.
Essential for support against horizontal rotation, enhancing retention and patient comfort.
Preserves oral tissue health and provides aesthetic benefits.
Commonly applied in Class I and II conditions with significant vertical resorption of residual ridges.
Stabilizes periodontally weakened anterior teeth and aids patients with high calculus formation.
Utilizes interrupted lingual plate for spacing issues (diastema), redirecting food impact away from interproximal areas.

Double Lingual Bar Features

Known as the Kennedy bar or split bar, also termed as a continuous lingual bar.
Requires at least 7-8mm of space between the alveololingual sulcus and gingival crevices.
Helps to manage bony and tissue undercuts effectively.

Maxillary Major Connectors

Types include palatal strap, double palatal bar, horseshoe (U-shaped), and full palatal coverage.
Palatal strap is the most versatile, catering to varying edentulous spans and ensuring minimal speech interference.
In cases requiring support, designs should maximize rigidity while being unobtrusive to tongue movement.

Palatal Strap Specifications

Suitable for Class III edentulous areas and long spans with tooth-bounded edentulous areas.
Emphasizes wide and thin configurations for optimal rigidity and discreetness.
Anterior strap should measure 8-10mm, lateral strap 7-9mm, and posterior strap 4-7mm.

Palatal Horseshoe Indications

Ideal for replacing several anterior teeth and conditions involving torus palatinus.
The presence of periodontally weakened teeth or a deep palatal vault may necessitate this connector.

Complete Palatal Coverage

Features a gingival relief area (pink line) to prevent food impaction, requiring a minimum 15mm window for effective function.
The anterior border aligns with the depression and rugae slopes, while the posterior bar should reach the hamular notch.

Lingual Bar Characteristics

The most common mandibular major connector; simple in design.
Best suited for cases requiring no indirect retention with sufficient space (8-10mm) between the sulcus and gingival tissue.

Contraindications for Lingual Bar

Not suitable for patients with a high lingual frenal attachment, elevated floor of the mouth, or lingual tori due to potential impingement.

Mandibular Major Connectors Variety

Includes lingual bar, lingual plate, double lingual bar, and labial bar.
The lingual plate is important for indirect retention and is ideally positioned on the middle third of the lingual surface of anterior teeth.

Configuration for Beading

A half pear shape in cross-section with the upper borders lightly beaded for better mucosal contact, creating a shallow 0.5mm depression.

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Description

This quiz covers key concepts in dental prosthetics, focusing on topics such as frenal attachment, stabilization against rotation, and retention support. Explore the advantages and disadvantages of different seating methods in specific clinical situations. Ideal for dental students and practitioners looking to enhance their understanding of prosthetic considerations.