What is contained within local anaesthetic cartridges?

Local anaesthetic cartridges typically contain a combination of an anaesthetic agent and a preservative. The anaesthetic is the active ingredient that works to block nerve signals, leading to a temporary loss of sensation in the targeted area. Common examples of local anaesthetics include lidocaine and articaine. The preservative is often added to prevent the growth of bacteria and to maintain the stability of the anaesthetic solution.

While some formulations may also include other components such as vasoconstrictors (which help prolong the effect of the anaesthetic by constricting blood vessels) or buffering agents, the primary components are indeed the anaesthetic and preservative. This combination ensures both efficacy and safety in dental procedures, allowing for effective pain management when performing treatments.

The other options mention substances that are not typically combined in a local anaesthetic cartridge or miss key components necessary for effective anaesthesia.