Dental preform comprising: - a central portion formed by a plurality of first wire elements and a first resin, the first wire elements extending mostly in a first direction, the first resin mechanically bonding the first wire elements to one another; - a peripheral portion in the form of a ring around the central portion perpendicularly to the first direction, the peripheral portion comprising second wire elements and a second resin, the second resin mechanically bonding the second wire elements to one another, the first wire elements and the second wire elements being mechanically bonded to one another at least by the first resin and the second resin; dental preform wherein the peripheral portion comprises a plurality of layers arranged on one another perpendicularly to the first direction, the layers passing round the central portion; wherein each layer has at least one turn formed by at least one of the second wire elements, the at least one second wire element presenting a longitudinal direction that is offset with respect to the first direction by an angle comprised between 10° and 80° or between 100° and 170°; wherein the second wire elements of two consecutive layers present opposite orientations; wherein the second wire elements of each layer do not belong to a fabric or to a woven element; wherein at least several layers of the plurality of layers further have a sheet chosen from a fabric, a woven element, a strip or a braid, the sheet being situated below or above the second wire-like elements in said several layers; and wherein the sheet extends from one end of the dental preform to the other in the first direction and extends over all the layers, the sheet being in the form of a spiral in a cutting plane perpendicular to the first direction, with an alternation between a thickness of sheet and a thickness of second wire element in a direction of observation perpendicular to the first direction and directed from the central portion up to one end of the peripheral portion. - a central portion formed by a plurality of first wire elements and a first resin, the first wire elements extending mostly in a first direction, the first resin mechanically bonding the first wire elements to one another; - a peripheral portion in the form of a ring around the central portion perpendicularly to the first direction, the peripheral portion comprising second wire elements and a second resin, the second resin mechanically bonding the second wire elements to one another, the first wire elements and the second wire elements being mechanically bonded to one another at least by the first resin and the second resin; dental preform wherein the peripheral portion comprises a plurality of layers arranged on one another perpendicularly to the first direction, the layers passing round the central portion; wherein each layer has at least one turn formed by at least one of the second wire elements, the at least one second wire element presenting a longitudinal direction that is offset with respect to the first direction by an angle comprised between 10° and 80° or between 100° and 170°; wherein the second wire elements of two consecutive layers present opposite orientations; wherein the second wire elements of each layer do not belong to a fabric or to a woven element; wherein at least several layers of the plurality of layers further have a sheet chosen from a fabric, a woven element, a strip or a braid, the sheet being situated below or above the second wire-like elements in said several layers; and wherein the sheet extends from one end of the dental preform to the other in the first direction and extends over all the layers, the sheet being in the form of a spiral in a cutting plane perpendicular to the first direction, with an alternation between a thickness of sheet and a thickness of second wire element in a direction of observation perpendicular to the first direction and directed from the central portion up to one end of the peripheral portion.