A hemisection is a surgical procedure usually performed at the lower molars for the conservation of a root. The roots are separated with a mill. One root is then removed. Due to the opening of the pulpal cavity during root separation, the remaining root must be provided with a canal filling and possibly supplied with a pin-stump structure. The remaining root serves as cantilever bridge for further prosthetic treatment.

Further indications for a hemisection are:

• Massive subgingival root caries
• Extensive parodontitis profunda at one root only
• Tooth fractures, in which one root is still worthy of conservation