30 Questions
What is the primary function of a major connector?
To join the components of the denture on one side to the opposite side
Which of the following is NOT a structural requirement for a major connector?
Flexibility
Why is rigidity an important requirement for a major connector?
To prevent stress concentration on individual teeth or supporting structures
What is the consequence of a flexible major connector?
Stress concentration on individual teeth or supporting structures
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
Which of the following is NOT a function of a major connector?
Providing direct retention for the denture
What is one of the advantages of a lingual bar?
It prevents decalcification of tooth surfaces
What is the primary purpose of providing relief for mandibular major connectors?
To prevent the connectors from lacerating the lingual mucosa
Which of the following is a contraindication for a lingual bar?
Bilateral tori mandibularis
What is a potential disadvantage of a lingual bar?
It can become flexible if poorly constructed
What factor determines the amount of relief required for mandibular major connectors?
The type of partial denture design
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
Which modification can be made to a lingual bar?
Splinting periodontally affected teeth
What is the purpose of avoiding sharp angles or corners in the design of mandibular major connectors?
To reduce stress concentration
What is a potential issue with a lingual bar modification?
It may cause discomfort to the tongue
What is a potential issue with an unmodified lingual bar?
It may cause food entrapment and discomfort
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
How should the presence of an undercut on the lingual side of the alveolar ridge be addressed in the laboratory?
Block out the undercut
What is the swing-lock labial bar used for in partial dentures?
Engaging tooth undercuts for retention
Why is a step-back design used in cases of diastema between anterior teeth?
To prevent metal display
What is a major concern associated with the lingual major connector in partial dentures?
Lack of normal physiologic stimulation of the gingiva
Why is metal considered difficult in terms of adjustments and acceptance in partial dentures?
It may cause gingival & periodontal diseases
In what situation can a swing-lock labial bar be particularly useful in partial dentures?
Severe bone resorption and few remaining natural teeth
What function does the double lingual bar serve in partial dentures?
Rigidity
What is the primary function of the closed horseshoe or antroposterior palatal strap?
To distribute occlusal load
What is a potential issue with an anterior thickened strap in a closed horseshoe or antroposterior palatal strap design?
It may interfere with phonetics
What is the recommended minimum width for the posterior strap component in a closed horseshoe or antroposterior palatal strap design?
8 mm
Which type of palatal bar is typically used when a large number of teeth are missing, and a torus is present?
Single palatal bar
Which type of palatal bar is recommended for interim partial dentures or when replacing one or two teeth on each side?
Single palatal bar
What is the recommended cross-sectional shape for the posterior bar component in an antroposterior or double palatal bar design?
Half-oval
Test your knowledge on dental prosthetics design, including aspects such as extensive teeth coverage, soft tissue coverage, esthetics, and preventing metal display in cases of diastema between anterior teeth. Learn about the effects of lingual teeth inclination on gingival and periodontal health.
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