Holograms and study models assessed by the PAR (Peer Assessment Rating) Index of malocclusion--a pilot study

A selection of 30 sets of study models, representing a wide range of malocclusions, was drawn from the records of a clinical orthodontic department. Four holograms were made of each set of models; the study models and their corresponding holograms were then scored using the Peer Assessment Rating (PAR) Index of malocclusion. Significantly lower scores (P < 0.01) were obtained from the holograms, which were ascribed to three out of the seven components which make up the index.