What is the most common cause of needle breakage?

The most common cause of needle breakage during a dental procedure is sudden patient movement. When a patient unexpectedly moves while a needle is inserted, it can create an environment where the needle is subjected to unusual stresses or angles. This movement may not only bend the needle but can also strain it in ways that lead to breakage.

In situations where the needle is not held steady, the risk of breakage increases significantly, as the needle can get caught or experience excessive pressure against hard tissues or bone. This underscores the importance of ensuring the patient is comfortable and as still as possible during injections to minimize the likelihood of such complications.

In contrast, while bending of the needle may contribute to breakage, it is less common than breakage that results directly from abrupt movements. Additionally, forceful contact with bone can lead to needle breakage, but this usually occurs under specific circumstances, often tied to technique rather than being a universal cause. Using thinner needles can sometimes increase the risk of breakage due to decreased strength, but the immediate risk from sudden movement tends to be the most significant factor in practice.