Hemisection of mandibular molars is a viable method of preserving periodontally or endodontically compromised teeth or roots. This paper describes a simple chairside CAD/CAM method of fabricating a cantilever crown for a hemisected molar. The technique is illustrated by a clinical case, which was treated according to this protocol and was followedup over 2.5 years. Given careful patient selection and strict recall intervals, the introduced method represents a conservative and cost-effective treatment modality for highquality ceramic reconstructions of root-resected teeth. In addition, other treatment options such as implantation or prosthesis, which would represent therapeutic and prosthetic endpoints, can be postponed. Palabras clave: CAD/CAM, Cerec, hemisection, mandibular molar, reconstruction, periodontitis