Method for validating a drilling template for producing an implant-borne tooth replacement

A method for validating a drilling template before performing an implant drilling for an implant-borne tooth replacement, wherein the drilling template that is produced has a drill guide and is placed on dental structures of a jaw area that is to be provided with the tooth replacement and which are present in the region of the implant drilling to be performed, the method comprising:

• inserting a measuring element into the drill guide of the drilling template,
• measuring the measuring element and at least one partial region of the dental structures not covered by the drilling template using an optical three-dimensional measuring method,
• determining a position and orientation of the measuring element in relation to the partial region of the dental structures from generated measured data of the optical measurement,
• creating a virtual actual implant drilling model is created on the basis of the optical measured data using the position and orientation determined for the measuring element and/or using the known dimensions of a drill to be used and/or the position of a stop surface on the drilling template for the drill to be used,
• comparing the actual implant drilling model with a planned virtual target implant drilling model from a previous implant planning with respect to its position and its orientation, and
• introducing the measuring element into the drill guide up to the stop surface, so that the depth of insertion and thus a spacing of the measuring element from the stop surface are known, wherein the measuring element has a fitting which is inserted into the drill guide of the drilling template, and wherein the measuring element is designed so that its position and orientation can be determined unambiguously by means of the optical three-dimensional measuring method.