Width of functional cusp in amalgam building:
- A- 1mm
- B- 2mm
- C- 10 mm
- D- 20 mm
The correct answer for the width of a functional cusp in amalgam building is: B. 2mm
Here's why the other options are incorrect:
A. 1mm:
This is too narrow for a functional cusp in an amalgam building. Cusps need to be wider to provide sufficient strength and function for chewing.
C. 10mm:
This is too wide for a functional cusp in most cases. Excessively wide cusps can be prone to fracture and may not fit properly within the occlusal anatomy.
D. 20mm:
This is much too wide for any cusp, functional or non-functional. Cusps typically range from 2-4mm in width.
Therefore, a minimum width of 2mm is considered the standard for functional cusps in amalgam restorations. This ensures adequate strength and chewing function while preventing excessive bulk and potential problems like fracture.
It's important to note that the ideal width of a cusp may vary depending on individual factors like tooth size, location, and occlusal relationships. A dentist will determine the appropriate width based on the specific requirements of each restoration.
