Fit of surgical guides--manufactured by InLab 3D

Based on an exclusively virtual implant planning and positioning concept, the fit of surgical-guide-like workpieces was evaluated in an in-vitro pilot study, manufactured with the InLab 3D system. From 85 maxillary casts, 8 were randomly selected. The first right maxillary incisor was removed. After optical impression of the maxillary anterior teeth, a drilling template was designed by the use of the InLab software, version 3.0. The mode "bridge" "dental database" was applied. The guidance was milled from a methacrylate block and braced on the adjacent teeth. After milling, they were checked for proper seat (without rocking). The discrepancies between the inner surface of the template and the opposing tooth surface was shown with a silcone based material, which rested on the casts after removing the template. The difference between the thickness of the silicone layer and the subjacent tooth surface was measured with a high resolution scanner. In order to characterize the fit of the 8 workpieces the average mean, average maximum and average minimum values of the fit were calculated in the buccal, incisal and palatinal area using the program Match 3D (W. Gloger, LMU): average mean: buccal: 65 microm; incisal: 116 microm; palatinal: 94 microm; average maximum: buccal: 162 microm; incisal: 202 microm; palatinal:190 microm; average minimum: buccal: 5 microm; incisal: 14 microm; palatinal: 15 microm. In the present study it was possible to produce drilling templates with the already commercially available InLab system. The results were presented at the Annual Meeting of the German Society of Computerized Dentistry 2007 as a short presentation.