Podcast
Questions and Answers
What is the preferred type of tooth for providing occlusal support in a denture?
What is the preferred type of tooth for providing occlusal support in a denture?
- Canine (correct)
- Molar or premolar (correct)
- First molar only
- Incisor
What is the minimum mesio-distal length required for the preparation of a lingual rest?
What is the minimum mesio-distal length required for the preparation of a lingual rest?
- 2.0 mm
- 1.5 mm
- 2.5 mm (correct)
- 3.0 mm (correct)
Which of the following methods is used to prepare an anterior tooth for a lingual rest?
Which of the following methods is used to prepare an anterior tooth for a lingual rest?
- Flat preparation on the facial surface
- Inverted U-shaped preparation at the gingival margin
- V-shaped preparation on the lingual surface (correct)
- Circular preparation on the incisal edge
What is the preferred tooth structure when a canine is absent for support?
What is the preferred tooth structure when a canine is absent for support?
What is the required labio-lingual width for the preparation of a lingual rest?
What is the required labio-lingual width for the preparation of a lingual rest?
Flashcards
Lingual Rest
Lingual Rest
A type of denture rest placed on the lingual surface of anterior teeth, usually canines, to provide support.
Canine
Canine
The preferred tooth for a lingual rest due to its strength and position.
Lingual Rest Preparation
Lingual Rest Preparation
The ideal placement of lingual rests, with a minimum of 2.5 to 3 mm mesio-distal length, 2 mm labio-lingual width, and 1.5 mm incisal-apical depth.
Multiple Lingual Rests
Multiple Lingual Rests
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Apex of Lingual Rest
Apex of Lingual Rest
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Study Notes
Lingual Rests (Cingulum Rest)
- Lingual rests are typically used with anterior teeth.
- The preferred rest is the occlusal rest on a molar or premolar.
- An anterior tooth can be an abutment for occlusal support.
- A canine is preferred over an incisor as an abutment for a lingual rest, especially when there is no canine.
- Multiple rests on several incisors could be used.
Preparation of Anterior Teeth for Lingual Rest
- Two methods exist to prepare an anterior tooth for a lingual rest:
- First Method: A slightly rounded V-shape is prepared on the lingual surface, at the junction of the gingival and middle third of the tooth. The V's apex points incisally.
- Mesio-distal length of preparation should be a minimum of 2.5–3 mm.
- Labio-lingual width should be approximately 2 mm.
- Incisal-apical depth should be at least 1.5 mm.
- The initial preparation starts with an inverted cone-shaped bur.
- The preparation progresses to a smaller, tapered bur with a rounded end to complete the preparation.
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