Auxiliary retention and the role of the core in fixed prosthodontics

Extensively damaged teeth frequently require placement of a core before preparation to receive an indirect restoration. Dentine pins have traditionally been used to enhance retention and resistance form when coronal dentine is significantly reduced; however, pins are invasive and may produce pulpal or periodontal problems. Cavity design features such as grooves, boxes or retentive pits may be better alternatives. The choice of the core material may also influence the outcome although reliable research data are scarce. Large cores should be considered to have a structural role in supporting the final restoration.