Hand instrument which we used to make internal angles retentive grooves and preparation of cavity walls in the cavity is:
- a- Angle former.***
- b- Chisel
- c- File
- d- Enamel hatched.
The correct answer is a- Angle former.
Here's why:
Angle formers are specifically designed for shaping and defining internal angles within a tooth cavity. They have several key features that make them ideal for this purpose:
- Bent shank:
The shank (handle) of an angle former is bent at an angle, typically around 135 degrees. This allows the dentist to access and work within narrow cavities without interference from adjacent teeth or structures.
- Working end:
The working end of an angle former is triangular or rhomboidal in shape, with sharp cutting edges. This shape allows the instrument to create precise, well-defined angles within the cavity preparation.
- Size and angulation:
Angle formers come in various sizes and angulations, allowing for customization based on the specific tooth and cavity being treated.
angle formers tools:
Here's how angle formers are used to achieve specific tasks:
- Creating internal angles:
They are used to establish sharp, distinct angles within the cavity preparation, which help to resist displacement of the restorative material.
- Forming retentive grooves:
They can be used to create small grooves within the cavity walls, which further enhance retention of the filling material.
- Preparing cavity walls:
They can also be used to smooth and refine the walls of the cavity preparation, ensuring a proper fit for the restorative material.
Other instruments:
Other instruments mentioned in the options are not ideal for these tasks:
- Chisels:
Chisels are primarily used for cutting enamel and removing carious dentin, but they are not designed for creating precise angles or retentive grooves.
- Files:
Files are used for smoothing and refining the margins of a cavity preparation, but they are not effective for shaping internal angles.
- Enamel hatchets:
Enamel hatchets are used for planing enamel walls and removing unsupported enamel rods, but they are not suitable for creating retentive grooves or shaping internal angles.
