American Journal of Orthodontics and Dentofacial Orthopedics
Original articleExploring the perception of orthodontic treatment need using the Dental Aesthetic Index and Index of Orthodontic Treatment Need
Section snippets
Material and methods
The Brazilian National Research Ethics Committee approved the study (protocol 759.321/2014). This cross-sectional study was conducted in municipal schools in the city of Araras (São Paulo, Brazil), with 12-year-old school children. The minimum sample calculated was 240 individuals, considering a test power higher than 80% for a significance level of 5% and prevalence of 50% (exposure/nonexposure ratio of 1:1; Epi Info software, Centers for Disease Control and Prevention, Atlanta, Ga). Excluded
Results
The studied population comprised 248 school children. There were 136 girls (54.8%) and 112 boys (45.2%). Gender and ethnicity did not have a statistically significant association with IOTN-DHC (P <0.05; Table I).
The concordance between IOTN-DHC, IOTN-AC, and DAI is presented in Table II. The prevalence of adolescents with high severity and orthodontic treatment need was 10.5% (95% CI, 6.7-14.3), 36.5% (95% CI, 32.3-44.3) and 73.4% (95% CI, 67.9-78.9) for IOTN-AC, IOTN-DHC, and DAI,
Discussion
The DAI and IOTN are established epidemiological occlusal indexes that have previously been used in different populations to determine the prevalence and orthodontic treatment need. Although several studies have objectively compared orthodontic treatment need indexes, different levels of agreement between DAI and IOTN have been reported,2, 4, 12, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33 which continue to raise doubts about the degree of association between them.
Previous studies
Conclusions
The perception of orthodontic treatment need was assessed differently when using DAI and IOTN. In addition, self-perception of orthodontic treatment need using IOTN-AC was the same as the clinicians' assessment using IOTN-DHC.
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All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest, and none were reported.