The purpose of this study is to compare the accuracy of measurements derived from a commercially available direct intra-oral scanning system with those taken from plaster study models, and to compare cost implications of both systems. The investigators will test the hypotheses: * There is no systematic difference between measurements taken from the Trios scanner and study models. * There is no difference in the cost of producing digital models.
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Measurement of tooth widths, arch lengths, overjet, overbite, crown heights and labio lingual widths
Timeframe: Within six weeks of initial intervention