Definition: As the name suggests, a matrix component part housed within the coronal tissue of the abutment tooth.
• As a resilient intracoronal attachment in the placement of a removable bounded saddle prosthesis .
• As a nonresilient intracoronal attachment in the fixed movable design of a fixed prosthesis.
Advantages • The contour of the abutment tooth is not altered as in the extracoronal types. • In fixed prosthodontics this attachment can overcome the problem of nonparallel abutments.
• The size of this attachment may result in it encroaching upon the pulp chamber, if the tooth is small or pulpal resorption has not occurred.
• Wear of the component parts of a removable prosthesis is inevitable and therefore reactivation is required.
• Adequate preparation of the tooth is required where the component part is to be housed.