Class 1 Amalgam Restorations Flashcards

Questions and Answers

Class ____ (4 classes) indicate an amalgam restoration

I, II, V, VI

Are amalgam restorations indicated for small or large caries?

large

Amalgam or Composite for a restoration to be done on a large occlusal contact area?

Amalgam

A preparation for an amalgam restoration has to be completely dry.

False Signup and view all the answers

If caries extend onto the root surface, amalgam or composite?

amalgam Signup and view all the answers

When you have to restore a tooth that is to be used as an abutment for an RPD, amalgam or composite?

amalgam Signup and view all the answers

Amalgam bonds to teeth well.

False Signup and view all the answers

Amalgam is brittle.

True Signup and view all the answers

In restoration preparation, what is the cavosurface margin?

The junction of the cavity preparation and the external surface of the tooth. Signup and view all the answers

Where do you find pits and fissures?

Occlusal surfaces of teeth, buccal/lingual of posterior teeth, lingual surface of anterior teeth. Signup and view all the answers

How wide does a class I amalgam restoration prep need to be?

1 mm Signup and view all the answers

What cavosurface line angle is required for class I amalgam preps?

90 degrees Signup and view all the answers

Match the following walls of class I amalgam prep:

Mesial and distal walls = Divergent Buccal and lingual walls = Convergent Signup and view all the answers

What are the advantages of lathe cut and spherical amalgam powder?

Lathe cut: resists condensation, adapts to cavity walls well, easy to obtain good interproximal contacts; Spherical: requires less mercury, sets rapidly, smoother surfaces, less corrosion, great early strength. Signup and view all the answers

In 1929, the ADA set restrictions on the composition of dental amalgams which stated that Copper (Cu) could not be more than ___% of the amalgam.

6 Signup and view all the answers

What advantages does the new admixed dental amalgam introduced in the 1960s have?

Good adaptation to walls, good interproximal contact, good strength, reduced marginal ditching. Signup and view all the answers

What are the benefits of spherical high copper amalgam?

Very strong, way less mercury, small particles for smooth surface and no corrosion. Signup and view all the answers

Study Notes

Amalgam Restorations Overview

Class I restorations: Address pits and fissures, typically on occlusal surfaces.
Class II restorations: Target proximal surfaces of posterior teeth.
Class V restorations: Located in the gingival third on facial or lingual surfaces of all teeth.
Class VI restorations: Found on the incisal edges or cusp tips.

Indications for Amalgam

Recommended for large caries rather than small ones.
Preferred for large occlusal contact areas over composite restorations.
Suitable for root surfaces affected by caries.

Restoration Procedure Insights

Amalgam restorations do not need the preparation site to be completely dry.
Used as the preferred choice for teeth that will serve as abutments for removable partial dentures (RPDs).

Bonding and Material Properties

Amalgam does not bond effectively to tooth structure; mechanical retention through preparation is essential.
The brittleness of amalgam necessitates a minimum pulpal depth of 1.5 mm.

Cavity Preparation and Design

Cavosurface margin: Intersection of cavity preparation and tooth's outer surface.
Class I prep requires a 1 mm width to fit the smallest amalgam condensing tool.
Class I restorations necessitate a 90-degree cavosurface line angle.
Mesial and distal walls of Class I prep should be divergent, while buccal and lingual walls should be convergent.

Amalgam Material Composition

Composed of liquid mercury and metal alloy powder, which can be:
- Lathe cut: More viscous, resists condensation, adapts well to walls, facilitates interproximal contacts.
- Spherical: Requires less mercury, sets quickly, offers smoother surfaces, reduced corrosion, and improved initial strength.

Historical Context and Advancements

In 1929, the ADA restricted copper content in dental amalgams to a maximum of 6%.
The introduction of admixed dental amalgam in the 1960s featured higher copper levels, providing advantages such as improved adaptation, strength, and reduced marginal ditching.
Spherical high copper amalgam, known as unicompositional, is noted for being strong, containing less mercury, and yielding a smooth surface with minimal corrosion.

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Description

Dive into the essentials of amalgam restorations with these flashcards. Covering classifications, indications for use, and comparisons with composite materials, this quiz is designed for dental students and professionals. Strengthen your understanding of when and how to implement these restorations effectively.