Question

How much local anesthetics is there in a dental cartridge of 1% concentration (1.8 ml cartridge)?

a. 9 mg
b. 18 mg
c. 36 mg
d. 54 mg

Answer 1

The correct calculation for the amount of local anesthetic in a 1% concentration dental cartridge of 1.8 ml is 18 mg (option b). This is obtained by multiplying the volume of the cartridge by the percentage concentration in decimal form. The correct option is option (b) 18 mg.

Step-by-step explanation:

The amount of local anesthetics in a dental cartridge of 1% concentration with a volume of 1.8 ml is 18 mg. The amount of local anesthetics in a dental cartridge of 1% concentration can be calculated using the formula:

Amount of anesthetics = concentration x volume

Given that the concentration is 1% and the volume of the cartridge is 1.8 ml, we can substitute these values into the formula:

Amount of anesthetics = 1% x 1.8 ml = 0.01 x 1.8 ml = 0.018 ml

To calculate the amount of anesthetic:

1. Determine the percentage concentration in decimal form by dividing the percentage by 100. For 1% concentration, it's 0.01.
2. Multiply this decimal by the volume of the cartridge in ml to find the mass of the anesthetic in mg. For a 1.8 ml cartridge, multiply 0.01 by 1.8 ml.
3. The calculation is 0.01 x 1.8 ml = 0.018 ml, which is equivalent to 18 mg since 1 ml of water is approximately equal to 1 mg.