1. A method for the surgical treatment of cranio-synostosis, comprising the steps of: a. manufacturing a three-dimensional sterilizable or disposable model by measuring age-related shape characteristics of a child's skull from the group of features including the horizontal curvature of the forehead, the vertical curvature of the forehead, the width of the forehead, the fronto-nasal angle, the fronto-occipital diameter, the biparietal diameter and the horizontal radius of curvature of the occipital module, selecting one or more of the established features of the measured age-related shape characteristics, conversion of the selected features in manufacturing a three-dimensional sterilizable or disposable model of a child's skull or parts from the skull from the selected features wherein the manufactured model is a moulding shell which comprises at least one of a frontal part, a parietal part and occipital part, which are present individually and separately from each other or connected to each other, b. removing a dysplastic calotte section of a patient affected by cranio-synostosis and dividing said calotte section into fragments, c. molding said fragments of said dysplastic calotte section of the patient onto said three-dimensional model by thinning, destabilization and/or modeling, d. fixing said fragments with stabilizer elements, thus forming an implant consisting of fragments and/or stabilizer elements, and e. implanting said implant by fitting and fixing in the patient's skull.