Which one of the following terms is used to describe an endodontic technique of removing contaminated pulp tissue from the pulp chamber only, leaving that in the root canal intact?

The technique used to remove contaminated pulp tissue from the pulp chamber while leaving the pulp in the root canal intact is called pulpotomy. This procedure is typically performed in primary teeth when the pulp is inflamed or infected, but the root canal pulp remains healthy. By removing only the compromised pulp tissue in the chamber, this approach aims to preserve the vitality of the remaining pulp tissue within the root canal, allowing for continued function of the tooth until it matures or further treatment is deemed necessary.

In contrast, an apicoectomy involves surgical removal of the tip of the tooth root and is not about treating pulp tissue within the pulp chamber. Pulp capping refers to a technique used to protect the pulp beneath a cavity from further decay and is not focused on removing any pulp tissue. A pulpectomy entails the complete removal of all pulp tissue from both the pulp chamber and the root canals, which differs markedly from the pulpotomy technique.