Bend Prosthodontics Combination Clasp Quiz and Flashcards

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Questions and Answers

Which of the following is an objective of Anna Yi's lecture?

To critique the use of retentive undercuts in prosthodontics

To debate the effectiveness of different types of dental floss

To discuss the differences between various types of major connectors (correct)

To perform a live demonstration of prosthodontic procedures

What is the reason provided for the utilization of different clasp designs?

To reduce the need for rest seats

To achieve ideal survey lines (correct)

To enhance aesthetic appeal in prosthodontic treatments

To analyze force distribution in dental bridges

According to the lecture objectives, what should students be able to do with regard to retentive clasps?

Conduct a comparative study of different restorative materials

Select a retentive clasp based on anatomy and location of retentive undercut (correct)

Explain the process of enamel bonding for retentive clasps

Discuss the history of retentive clasps in dentistry

What is the primary focus when discussing the various types of rests in the lecture objectives?

Correctly select the appropriate rests based on force distribution criteria Signup and view all the answers

Which type of clasp is indicated when there are no edentulous space on the other side of the arch?

Embrasure Clasp Signup and view all the answers

What is the disadvantage of using Hairpin Clasp / C Clasp / Fishhook Clasp / Reverse loop?

Food trap Signup and view all the answers

Which type of clasp engages the ML or MB undercut on mandibular molars?

Ring Clasp Signup and view all the answers

In which direction does the Infrabulge clasp approach the undercut?

Gingival direction Signup and view all the answers

What does RPI stand for in the context of Removable Partial Denture (RPD)?

Rest, Proximal Plate and I Bar Signup and view all the answers

What is the main purpose of Overlay / Onlay Clasp?

To cover the occlusal surface of tilted molars Signup and view all the answers

What is a contraindication for using Infrabulge clasps?

Lack of facial undercut Signup and view all the answers

What is the main purpose of indirect retention in free-end saddle cases?

To prevent movement of the denture base during function Signup and view all the answers

In what situation is a lingual plate major connector indicated?

When lingual tori are present Signup and view all the answers

What is the design consideration for fabricating a labial bar major connector?

Must have adequate labial sulcus depth > 7 mm Signup and view all the answers

When is an interrupted lingual bar major connector used?

When there are diastemata in the anterior teeth Signup and view all the answers

What distinguishes a sublingual bar from a lingual bar?

The shape and dimensions of the bar Signup and view all the answers

What is the most common design of a lingual bar major connector?

Half pear shaped bar with 4 mm in height and 2 mm in width Signup and view all the answers

What are the indications for using a Kennedy bar/double lingual bar/cingulum bar major connector?

When space does not allow placement of a lingual bar Signup and view all the answers

What distinguishes a lingual plate from a labial bar major connector?

Superior margin placement near the junction of Middle and Gingival third Signup and view all the answers

What is the advantage of the Combination clasp?

Flexibility and adjustability Signup and view all the answers

Where is the undercut located for the Reverse loop undercut clasp?

Near zone Signup and view all the answers

What is the main disadvantage of the Reverse Circlet / Reverse attachment clasp arm?

Interferes with the occlusion Signup and view all the answers

Which clasp cannot be used if the sulcus depth is shallow?

Roach Clasp / Infrabulge Clasp Signup and view all the answers

What is the treatment option for Atypical B Survey line?

Recontour tooth to move the survey line Signup and view all the answers

What is the purpose of an Overlay / Onlay rest?

To eliminate the need for cast restoration on abutment teeth Signup and view all the answers

What type of rest helps prevent food impaction where it is adjacent to the abutment tooth?

Occlusal rest Signup and view all the answers

What is the function of an Interproximal rest?

Embrasure preparation Signup and view all the answers

What is the advantage of using a Roach Clasp / Infrabulge Clasp?

Engagement with shallow sulcus depth Signup and view all the answers

What is the purpose of a Cast reciprocal arm in a Combination clasp?

To provide stability to the clasp assembly Signup and view all the answers

What is the primary function of a Rest Seat in dentistry?

To receive the occlusal, incisal, cingulum, or lingual rest Signup and view all the answers

What is the treatment option for Atypical C Survey line?

Extended arm clasp Signup and view all the answers

What is the purpose of an embrasure clasp?

To provide indirect retention for denture base movement Signup and view all the answers

Why is the preparation of marginal ridges and adjacent facial inclines necessary for embrasure clasps?

To provide sufficient metal bulk and avoid clasp fracture Signup and view all the answers

Which type of RPDs require indirect retention?

Kennedy Class I, II, and IV Signup and view all the answers

What is the preferred location for placing the retentive clasp terminal to increase retention?

Greater horizontal undercut or angle of cervical convergence Signup and view all the answers

What is the main function of an indirect retainer in RPDs?

To prevent rotation of the denture base Signup and view all the answers

Why are incisal rests mostly used on canines?

Canines have a greater distance from the abutment's center of rotation Signup and view all the answers

What should be considered when preparing incisal rests?

The depth and width dimensions of the rest Signup and view all the answers

What is a potential drawback of incisal rests?

They may deliver harmful forces due to greater distance from abutment's center of rotation Signup and view all the answers

Which of the following palatal connectors consists of a thin sheet of metal and may be preferred by patients due to the exposed palate?

U-shaped (horseshoe) Signup and view all the answers

What is the primary reason for not using a thin sheet of metal for the U-shaped (horseshoe) palatal connector in distal extension RPD?

Less resistance to flexure Signup and view all the answers

Which type of palatal connector is thinner than the palatal bar and is more comfortable for patients?

Palatal strap Signup and view all the answers

When is the antero-posterior palatal strap/bar major connector used?

When torus is present and is to be removed Signup and view all the answers

What are the indications for using a complete palatal plate major connector?

Few anterior teeth are remaining Signup and view all the answers

What is the primary advantage of a complete palatal plate major connector?

Ultimate rigidity and support for the RPD Signup and view all the answers

What should be considered when selecting a retentive clasp with respect to material and configuration?

Anatomy and location of retentive undercut Signup and view all the answers

What are the variations of the palatal strap major connector?

Anterior palatal strap / Posterior palatal strap Signup and view all the answers

'Flex your RPD knowledge muscles' implies considering what aspect when discussing the antero-posterior palatal strap/bar major connector?

'Flexural strength' Signup and view all the answers

'Cues for discussion points' when examining the complete palatal plate major connector include considering what aspects?

'Pros and cons' Signup and view all the answers

Study Notes

An embrasure clasp consists of two components joined at their bodies
Frequently used for sides without edentulous space
Originated as a minor connector between teeth
Preparation of marginal ridges and adjacent facial inclines needed for sufficient metal bulk
Inadequate preparation can result in thin metal, leading to clasp fracture
Occlusal rests should be properly prepared for dentures and to prevent occlusal problems
Indirect retainers used to prevent rotation of denture base caused by occlusal forces or sticky foods
Indirect retainer functions through lever action on the opposite side of the fulcrum line when denture base moves
Indirect retainers reduce tendency for denture base to move in occlusal direction or rotate around fulcrum line
Kennedy Class I, II, and IV RPDs require indirect retention, not Class III
Various rests can act as indirect retainers: occlusal, cingulum, or incisal
Incisal rests are prepared on incisal edges, mostly used on canines
Dimensions: 1.5 mm depth x 2.5 mm width, esthetic impact on patient should be considered
Incisal rests may deliver harmful forces due to greater distance from abutment's center of rotation
Cingulum rest is preferred over incisal rest, mostly used on maxillary canines, dimensions same as incisal rests
Lecture objectives: discuss differences between major connectors, choose appropriate one, and understand various clasp designs
Selecting retentive clasp based on undercut anatomy and location
Placing the retentive clasp terminal in greater horizontal undercut or angle of cervical convergence increases retention
Materials used for fabricating RPD: chrome cobalt, wrought wire
Original Research Article: Bend testing of wrought wire removable partial denture alloys, J Prosthet Dent. 1996 Nov;76(5):559-65
Further reading: Dental Technician, Prosthetic, Navy Training Course; Stewart's Clinical Removable Partial Prosthodontics, 4th Edition; McCracken's Removable Partial Prosthodontics, 12th Edition; Bend testing of wrought wire removable partial denture alloys, J Prosthet Dent. 1996 Nov;76(5):559-65

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Description

Test your knowledge of dental prosthodontics surveying, clasp selection, and types of rests. This quiz covers the anatomy and location of retentive undercuts, materials and configurations for retentive clasps, and the criteria for force distribution to select appropriate rests.

Dental Prosthodontics Surveying and Clasp Selection Quiz