"Objectives:" 1) Modification of 3D holographic sensors for scanning orthodontic plaster cast models. 2) Constructing a 3D multi-resolution model from the digitized scanned data. 3) Developing a new computerized program enabling accurate measurements of the 3D images of the casts. "Methods:" Thirty orthodontic cast models were divided into 3 equal groups according to the severity of tooth crowding (no crowding, moderate and severe crowding). Manual measurements of teeth width and arch length were preformed using a digital caliper. Additionally Space and Bolton analyses were calculated. All models were scanned with "Optimet" (Jerusalem, Israel) holographic scanner, into the 3D system. A new 3D computerized system named "TELEDENT" was developed and a computerized line and virtual plane were constructed to perform measurements of teeth width and arch length on the 3D casts. The manual cast measurements were compared with those done by the "TELEDENT" system. Significance was determined by using pared Wilcoxon ranksum test and Kruskal-Wallis analysis of variance test. "Results:" The results showed that all the measurements and analyses obtained by the 3D virtual plane were similar to the manual cast measurements. Measurements of the teeth by the computerized line were found statistically smaller than that of the manual procedure however, this difference was small (0.3mm) therefore, lacks clinical relevance. Comparing space analysis between manual and computerized line also showed statistical differences. The magnitude of these differences ranged from 1.19-3.0mm. In other words the space analysis calculated from the computerized line can cause severe crowding to look like moderate one. "Conclusions:" The new technique of 3D virtual planes can replace the manual technique, and can be used clinically on a daily basis. The advantages of using the 3D "TELEDENT" system are: less time consuming, accurate measurements, no need for storage and archive and online consultant and presentation.

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