A plunger assembly (10, 10', 110, 310, 410, 410', 510, 610) for a cartridge for dispensing dental material, the plunger assembly (10, 10', 110, 310, 410, 410', 510, 610) comprising: - a receptacle (20, 20', 120, 520, 620), an activator (30, 30', 130, 330, 430, 530, 630), and a passageway extending through the receptacle along a longitudinal axis; - wherein the passageway over a first section X1 along the longitudinal axis A extends at a first inner cross-section, and over a second section X2 along the longitudinal axis extends at a greater second inner cross-section; - at least part of the second section X2 forming a chamber (23, 23', 103) for storing at least a component of the dental material and the first section X1 forming an outlet for the chamber (23, 23'); - wherein the activator (30, 30', 130, 330, 430, 530, 630) is movably received within the passageway for a movement along the longitudinal axis A; - the activator (30, 30', 130, 330, 430, 530, 630) having a first portion, a second portion and a third portion extending along the longitudinal axis A with the third portion being arranged between the first and second portion; - the first portion forming a plug (34, 134a, 134b, 334, 534) for the outlet and having a first outer cross-section adapted for sealing with the first inner cross-section, and - the second portion forming a piston (31, 335) for extruding the component from the chamber (23, 23') and having a second outer cross-section adapted for sealing with the second inner cross-section; and - wherein the third portion has a third outer cross-section that is smaller than the first inner cross-section - wherein the first and second portion are disconnected. - a receptacle (20, 20', 120, 520, 620), an activator (30, 30', 130, 330, 430, 530, 630), and a passageway extending through the receptacle along a longitudinal axis; - wherein the passageway over a first section X1 along the longitudinal axis A extends at a first inner cross-section, and over a second section X2 along the longitudinal axis extends at a greater second inner cross-section; - at least part of the second section X2 forming a chamber (23, 23', 103) for storing at least a component of the dental material and the first section X1 forming an outlet for the chamber (23, 23'); - wherein the activator (30, 30', 130, 330, 430, 530, 630) is movably received within the passageway for a movement along the longitudinal axis A; - the activator (30, 30', 130, 330, 430, 530, 630) having a first portion, a second portion and a third portion extending along the longitudinal axis A with the third portion being arranged between the first and second portion; - the first portion forming a plug (34, 134a, 134b, 334, 534) for the outlet and having a first outer cross-section adapted for sealing with the first inner cross-section, and - the second portion forming a piston (31, 335) for extruding the component from the chamber (23, 23') and having a second outer cross-section adapted for sealing with the second inner cross-section; and - wherein the third portion has a third outer cross-section that is smaller than the first inner cross-section - wherein the first and second portion are disconnected.