ABSTRACT
Statement of the Problem: The validity of the Index of Complexity, Outcome and Need [ICON] which is an orthodontic index developed and introduced in 2000 should be studied in different ethnic groups
Purpose: The aim of this study was to perform an analysis on the ICON and to verify whether this index is valid for assessing both the need and complexity of orthodontic treatment in Iran
Materials and Method: Five orthodontists were asked to score pre-treatment diagnostic records of 100 patients with a uniform distribution of different types of malocclusions determined by Dental Health Component of the Index of Treatment Need. A calibrated examiner also assessed the need for orthodontic treatment and complexity of the cases based on the ICON index as well as the Index of Orthodontic Treatment Need [IOTN]. 10 days later, 25% of the cases were re-scored by the panel of experts and the calibrated orthodontist
Results: The weighted kappa revealed the inter-examiner reliability of the experts to be 0.63 and 0.51 for the need and complexity components, respectively. ROC curve was used to assess the validity of the index. A new cut-off point was adjusted at 35 in lieu of 43 as the suggested cut-off point. This cut-off point showed the highest level of sensitivity and specificity in our society for orthodontic treatment need [0.77 and 0.78, respectively], but it failed to define definite ranges for the complexity of treatment
Conclusion: ICON is a valid index in assessing the need for treatment in Iran when the cut-off point is adjusted to 35. As for complexity of treatment, the index is not validated for our society. It seems that ICON is a well-suited substitute for the IOTN index
ABSTRACT
This study was designed to compare the tooth size discrepancy as a factor of skeletal malocclusion in orthodontic patient population of Shiraz. The study employed the pretreatment models of 200 patients, which were selected through a random available sampling method. The mesiodistal dimensions of teeth were measured by digital electron calipers [accurate to 0.01 mm] and the Bolton indices were determined. The study population was divided into four malocclusion groups according to Angle classification [Class I, Class II Div 1, Class II Div 2 and Class III]. The data were analyzed using ANOVA and Duncan tests by SPSS software and the level of significance was p<0.05. The mean anterior ratio [79.01] of the total malocclusion group had a statistically significant difference with that of Bolton [77.2] but no significant difference was found for the overall ratio. The posterior and overall ratios of Class III malocclusion group were statistically greater than the other malocclusion groups. However, regarding the anterior ratio, the Class III group had a greater mean than Class II with no difference with Class I malocclusion group. Comparing the two types of Class II malocclusion for ratios, no significant differences were observed