Variability in recording and grading the need for orthodontic treatment using the handicapping malocclusion assessment record, occlusal index and dental aesthetic index.

This investigation evaluates three malocclusion treatment need indices, the Handicapping Malocclusion Assessment Record (HMAR), the Occlusal Index (OI) and the Dental Aesthetic Index (DAI), for reliability and inter-index correlation. Pretreatment study models of 30 cases (mean age 12.9 years, SD 1.2) were assessed using each index. All the indices demonstrated a high level of reliability and non could be selected over the other with regards intra-examiner differences. The DAI, however, was more time-saving (2.68 mins, SD 0.41) and simple to use. The highest correlation was between HMAR and OI (r = 0.87, P < 0.001) which is a reflection of the similarity in their design. This study also discusses the limitations of the three indices.