The invention relates to a scanning system for carrying out a 3D scan of a tooth model, comprising an imaging device and a positioning system in the form of a sliding panel which can be positioned and has first locking means. On the locking panel there are provided second locking means which interact with the first locking means such that the sliding panel can assume one of several specified positions relative to the locking panel and locks in the selected position.The invention also relates to a sliding panel for scanning dental models which has means for mounting the dental model and stands on projections disposed on its underside.The invention also relates to a method of producing a 3D scan of a tooth model by the following steps: creating a first image of said object to be scanned at a precisely defined locked position, moving said sliding panel to at least one further precisely defined locked position and creating another image at each such position, and creating a 3D data set by evaluating the images produced at said at least two different, precisely defined positions.