What treatment is most likely to be undertaken if a discoloured upper right central incisor becomes apparent after a traumatic injury?

When a discolored upper right central incisor appears following a traumatic injury, the most appropriate treatment is often an open apex root filling. This approach is particularly relevant in cases where the tooth's pulp may be compromised, yet the root is still developing and has not fully formed an apex.

In such scenarios, the tooth may still have the potential for healing and development, especially if there are no signs of complete pulp necrosis. An open apex root filling allows for the management of the tooth's pulp while encouraging continued root development. This procedure typically involves cleaning the canal and placing a biocompatible material that supports the formation of a hard tissue barrier at the apex.

Other treatments, while they might be necessary depending on the specific condition of the tooth, do not directly address the root development and recovery of vitality in the same way. For instance, extraction would eliminate the tooth altogether, and pulpectomy or pulp capping are not as appropriate when dealing with an incomplete root development situation. Therefore, an open apex root filling is the favored treatment in managing this type of dental trauma effectively.