What is the amount of local anesthetic in a dental cartridge of 4% concentration (1.8 ml cartridge)?

To determine the amount of local anesthetic in a dental cartridge, you can use the formula that calculates the drug quantity based on its concentration and volume.

In this case, you have a 4% concentration of local anesthetic in a 1.8 mL cartridge. The percentage concentration indicates that there are 4 grams of anesthetic per 100 mL of solution. To find the amount in the 1.8 mL cartridge, first convert the percentage to milligrams:

1.4% concentration translates to 4 grams per 100 mL, which is equivalent to 4000 mg per 100 mL. To find out how much is in 1 mL, you divide by 100:

4000 mg / 100 mL = 40 mg/mL.

2. Now, multiply the concentration per mL by the volume of the cartridge:

40 mg/mL × 1.8 mL = 72 mg.

Thus, the amount of local anesthetic in the cartridge is 72 mg. This calculation confirms that the answer provided is accurate based on the concentration and volume of the local anesthetic.