substructure
The underlying supportive framework of a fixed or implant-supported restoration, typically fabricated from metal or zirconia, onto which veneering porcelain or composite is applied.
Full Definition
In dental laboratory terminology, the substructure (also called a coping or framework at the individual unit level) refers to the rigid inner core of a restoration that provides structural integrity. It is designed to fit precisely over the prepared tooth or implant abutment and serves as the bonding surface for aesthetic veneering materials. Editors must distinguish 'substructure' from 'superstructure,' which refers to the overlying prosthetic component. The term appears frequently in implant prosthetic reports and technical prescriptions.
Usage
Usage note: Do not conflate 'substructure' with 'coping'; 'coping' typically refers to a single-unit substructure, whereas 'substructure' may describe multi-unit frameworks.
In Context
- "The substructure was milled from a pre-sintered zirconia block and returned for veneering." — Laboratory Work Order
- "Ensure the substructure design specifications are noted before the porcelain build-up stage." — Technical Prescription Review