Dental Prosthetics Design Quiz

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What is the primary function of a major connector?

To join the components of the denture on one side to the opposite side (correct)
To prevent impingement of the free gingival margin
To provide retention for the denture
To distribute occlusal forces evenly across the supporting structures

Which of the following is NOT a structural requirement for a major connector?

Termination away from the gingival tissues
Avoidance of impingement on the free gingival margin
Flexibility (correct)
Rigidity

Why is rigidity an important requirement for a major connector?

To prevent stress concentration on individual teeth or supporting structures (correct)
To reduce the overall weight of the denture
To provide indirect retention for the denture
To allow for easier removal and insertion of the denture

What is the consequence of a flexible major connector?

Stress concentration on individual teeth or supporting structures (D) Signup and view all the answers

Why should the border of a major connector never terminate on the gingival tissues?

To avoid injury or irritation to the highly vascular gingival margin (D) Signup and view all the answers

Which of the following is NOT a function of a major connector?

Providing direct retention for the denture (B) Signup and view all the answers

What is one of the advantages of a lingual bar?

It prevents decalcification of tooth surfaces (C) Signup and view all the answers

What is the primary purpose of providing relief for mandibular major connectors?

To prevent the connectors from lacerating the lingual mucosa (C) Signup and view all the answers

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

Bilateral tori mandibularis (A) Signup and view all the answers

What is a potential disadvantage of a lingual bar?

It can become flexible if poorly constructed (A) Signup and view all the answers

What factor determines the amount of relief required for mandibular major connectors?

The type of partial denture design (B) Signup and view all the answers

Which anatomical feature of the lingual side of the alveolar ridge requires maximum relief for mandibular major connectors?

A tissue surface sloping towards the tongue (B) Signup and view all the answers

Which modification can be made to a lingual bar?

Splinting periodontally affected teeth (A) Signup and view all the answers

What is the purpose of avoiding sharp angles or corners in the design of mandibular major connectors?

To reduce stress concentration (D) Signup and view all the answers

What is a potential issue with a lingual bar modification?

It may cause discomfort to the tongue (A) Signup and view all the answers

What is a potential issue with an unmodified lingual bar?

It may cause food entrapment and discomfort (A) Signup and view all the answers

What design feature is required for maxillary major connectors according to the text?

They should be symmetric on both sides and cross the palate in a straight line (B) Signup and view all the answers

How should the presence of an undercut on the lingual side of the alveolar ridge be addressed in the laboratory?

Block out the undercut (C) Signup and view all the answers

What is the swing-lock labial bar used for in partial dentures?

Engaging tooth undercuts for retention (D) Signup and view all the answers

Why is a step-back design used in cases of diastema between anterior teeth?

To prevent metal display (C) Signup and view all the answers

What is a major concern associated with the lingual major connector in partial dentures?

Lack of normal physiologic stimulation of the gingiva (B) Signup and view all the answers

Why is metal considered difficult in terms of adjustments and acceptance in partial dentures?

It may cause gingival & periodontal diseases (D) Signup and view all the answers

In what situation can a swing-lock labial bar be particularly useful in partial dentures?

Severe bone resorption and few remaining natural teeth (C) Signup and view all the answers

What function does the double lingual bar serve in partial dentures?

Rigidity (C) Signup and view all the answers

What is the primary function of the closed horseshoe or antroposterior palatal strap?

To distribute occlusal load (A) Signup and view all the answers

What is a potential issue with an anterior thickened strap in a closed horseshoe or antroposterior palatal strap design?

It may interfere with phonetics (D) Signup and view all the answers

What is the recommended minimum width for the posterior strap component in a closed horseshoe or antroposterior palatal strap design?

8 mm (B) Signup and view all the answers

Which type of palatal bar is typically used when a large number of teeth are missing, and a torus is present?

Single palatal bar (A) Signup and view all the answers

Which type of palatal bar is recommended for interim partial dentures or when replacing one or two teeth on each side?