COMPARISON PAR INDEX AND ICON FOR ORTHODONTIC TREATMENT OUTCOME

In order to quantify malocclusion, occlusal traits are often given a numerical weighting system and combined into mathematical expressions called occlusal indices. The most important advantage of using occlusal indices is to maximize consistency between and within examiners. The use of the pre- and post-treatment scores to derive an estimate of treatment improvement is familiar. Peer Assessment Rating Index (PAR index) has been developed to provide a single summary score for all the occlusal anomalies which may be found in a malocclusion. The score provides an estimate of how far a case deviates from normal alignment and occlusion. The difference in scores between the pre- and post-treatment cases reflects the degree of improvement and, therefore, the success of treatment. The Index of Treatment Complexity, Outcome, and Need (ICON) has relatively lower predictive accuracy for the treatment outcome than for treatment need judgements. This study showed correlation between PAR index and ICON with respect to outcome. Twenty patients were identified who had undergone removable appliance treatment within the Orthodontics Laboratory Dentistry Faculty Hang Tuah University. Patients were included in the study if they fulfilled the following criteria: undergone removable appliance 2 years, and pre- and post-treatment study models available.