What is a Cavosurface angle in dentistry?
Cavosurface angle is the angle of the tooth structure formed by the junction of a prepared wall and the external surface.[9] Various theories have been proposed for the orientation of the walls and the corresponding AMA.
What instrument is used to uncover the Cavosurface margins resting partially on the tooth structure?
Check the cavo-surface margins with a cowhorn explorer, with its tip held 90 degrees to the interface of tooth/restoration.
What is favorable property of a dental material?
10 Cards in this Set
| What is a favorable property of a dental material | Low solubility |
|---|---|
| Wetting, viscosity, surface characteristics, and film thickness are all characteristics that affects which of the following application properties? | Adhesion |
Which instrument smoothes the margins of an amalgam restoration?
Burnisher – used to smooth the surface of a freshly placed amalgam restoration.
What is a Cavosurface margin?
Cavosurface margin. The intersection between the cavity and the healthy surface of a tooth. convenience form. Alternations in the shape of a cavity preparation to allow removal of decay and to enable proper instrumentation for cavity preparation and intersection of a dental restoration.
What happens if Cavosurface angle is more than 90?
Standard text books suggest CSA and AMA of 90°, which in turn provide for the resistance form of the cavity and the restoration. However, studies show that the above-recommended CSA and AMA are not generally achieved and attempt to achieve 90° cavosurface angle generally leads to excess undermining of the cusps.
Which of the following prevents fracture of Mo amalgam?
Therefore, a cavity prepared for amalgam restoration must provide for adequate amalgam thickness on the occlusal of at least 2 mm. Enamel is highly brittle, however, dentin which is softer acts as a cushion to support enamel and prevent its fracture.
How long does it take for most amalgams to gain their maximum strength?
Alloys of the single melt high copper type generally possess the greatest strength at all times of testing. The amalgams tend to achieve maximum tensile strength more rapidly than maximum compressive strength. The major increase in strength takes place between one hour and one day.
What are the manipulations of amalgam restorative materials?
Manipulation of amalgam
- Manipulation of dental amalgam 1) Selection of alloys 2) Proportioning and dispencing 3) Trituration 4)Condensation 5)Carving 6)Finishing and polishing.
- Trituration: Trituration is the process by which mercury is allowed to react with the alloy powder.
- Thank You.
Where is the Cavosurface margin?
Cavosurface Margin It is the junction of the prepared and the unprepared surface of the tooth. Because of the property of the amalgam being brittle when the bulk of material is thin, it should be placed on a tooth with a cavosurface margin of 90 degrees. Also, this angle should be present when making proximal boxes.
Why is Cavosurface angle 90 degrees?
In addition to this, we need to consider the cavosurface angle. This is the angle between the surface of the tooth and the cavity walls. In an amalgam cavity, we aim for an angle of 90°. This is once again to protect the margins of the restoration.