Which instrument is utilized to pack the gutta percha in a root canal?

The instrument specifically utilized to pack gutta percha into a root canal is the gutta percha spreader. This tool is designed to effectively adapt the gutta percha to the walls of the root canal, ensuring a tight seal and preventing the possibility of re-infection. The spreader has a narrow, tapered tip that allows for precise placement of the gutta percha, as well as the ability to compact the material in the canal space, which is crucial for achieving proper root canal sealing.

In contrast, the other instruments listed serve different purposes in endodontic procedures. An endo measuring device is used to determine the length of the root canal, ensuring that the dentist can effectively clean and prepare the canal without overextending instruments beyond the root apex. The endo explorer is primarily utilized for locating and accessing the canal orifices and examining the canals, while the irrigating syringe is used to deliver irrigating solutions into the root canal for cleaning and disinfection. Each of these instruments plays a vital role in the root canal treatment process but does not perform the specific function of packing gutta percha.