American Journal of Orthodontics and Dentofacial Orthopedics
Short communicationMalocclusion severity in Asian men in relation to malocclusion type and orthodontic treatment need
Section snippets
Material and methods
The sample of medically fit army recruits (n = 339; age, 17-22 years) with no history of orthodontic treatment, serial extractions, and craniofacial anomalies participated in this research voluntarily with informed consent. Impressions were taken from all participants for study model fabrication. Type of malocclusion was defined according to the British Standard Institute Incisor Classification.13 Severity of malocclusion and treatment need were evaluated based on study model analysis by using
Results
Intraexaminer PAR assessment was very good, with a correlation coefficient of r = 0.96 (P < .05). Weighted kappa scores for DHC and EC were 0.96 and 0.82, respectively, which indicated very good intraexaminer agreement.
The mean and median PAR scores and sample sizes of the various malocclusions are shown in Table I. Mean PAR scores for Class I, Class II Division 1, Class II Division 2, and Class III malocclusions were 17, 20, 28, 18, respectively. The mean and median PAR scores of Class II
Discussion
The mean PAR scores indicated that most malocclusions would be categorized in the straightforward treatment category,3 mainly observed in Classes I and III malocclusions. Class II Division 2 malocclusions had the highest PAR scores compared with the other types of malocclusion. These results suggest that Class II malocclusions in Asian men have more occlusal-trait deviation than Class I or Class III malocclusions. Thus, Class II malocclusions in this sample could be perceived to be more
Conclusions
Class II malocclusions in Asian men were found to be more severe than Class I and Class III malocclusions. The highest mean and median PAR scores were found in Class II Division 2 malocclusions. Malocclusions with definite treatment need had PAR scores that were significantly greater than those with borderline, little, or no need. ROC curves showed that the PAR index has an acceptable level of validity with the professional assessment of orthodontic treatment need in Asian malocclusions. The
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2010, American Journal of Orthodontics and Dentofacial OrthopedicsCitation Excerpt :The optimal cutoff score for determining orthodontic treatment needs with the PAR index, maximizing agreement based on the decisions of orthodontic experts in white subjects, is 17 for the PAR in both the United States and the United Kingdom.14 In Asian subjects, Soh et al15 reported that a PAR index of 17 was the optimum cutoff for presumed compromised dental health and a PAR index of 20 for esthetic impairment. These investigations suggest that the casts with a PAR index of 18 and 19 in this study might be considered borderline cases for orthodontic treatment by orthodontists and were perceived to require little treatment by residents and students.
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