A two part modelling aid for connection to a dental implant component , the modelling aid comprising a hollow base part comprising an open apical end , an open coronal end and a tubular side wall extending from the apical to coronal end along a linear longitudinal axis (L B ), the side wall having an interior and an exterior surface, one of said surfaces comprising an anti-rotation section having a non-circular symmetric cross-section in a plane perpendicular to the longitudinal axis, and a hollow angled part comprising an open apical end , an open coronal end and a tubular side wall extending between the apical end and coronal end and having an interior and exterior surface, the tubular side wall forming an apical portion of the angled part extending along a first linear axis (L 1 ), and a coronal portion of the angled part extending along a second axis, the second axis being non-coaxial to the first axis such that the tubular sidewall creates a non-linear channel , the apical portion being sized and shaped to form a friction fit with the base part, wherein, when the base part is connected to the angled part, a closed channel is formed extending from the apical end of the base part to the coronal end of the angled part, the first axis of the apical portion of the angled part being coaxial to the longitudinal axis of the base part and the anti-rotation section of the base part being exposed on a surface of the base part, characterized in that the base part and apical portion of the angled part each comprise at least two circumferentially spaced rotational stops , each stop being formed by a radially and axially extending surface, the rotational stops being arranged such that, when the base part is connected to the angled part, relative rotation in either direction is limited by the abutment of a rotational stop of the base part against a rotational stop of the angled part. a hollow base part comprising an open apical end , an open coronal end and a tubular side wall extending from the apical to coronal end along a linear longitudinal axis (L B ), the side wall having an interior and an exterior surface, one of said surfaces comprising an anti-rotation section having a non-circular symmetric cross-section in a plane perpendicular to the longitudinal axis, and a hollow angled part comprising an open apical end , an open coronal end and a tubular side wall extending between the apical end and coronal end and having an interior and exterior surface, the tubular side wall forming an apical portion of the angled part extending along a first linear axis (L 1 ), and a coronal portion of the angled part extending along a second axis, the second axis being non-coaxial to the first axis such that the tubular sidewall creates a non-linear channel , the apical portion being sized and shaped to form a friction fit with the base part, wherein, when the base part is connected to the angled part, a closed channel is formed extending from the apical end of the base part to the coronal end of the angled part, the first axis of the apical portion of the angled part being coaxial to the longitudinal axis of the base part and the anti-rotation section of the base part being exposed on a surface of the base part, characterized in that the base part and apical portion of the angled part each comprise at least two circumferentially spaced rotational stops , each stop being formed by a radially and axially extending surface, the rotational stops being arranged such that, when the base part is connected to the angled part, relative rotation in either direction is limited by the abutment of a rotational stop of the base part against a rotational stop of the angled part. <EOS>