Evaluation Of Orthodontic Effect On The Adult And Adolescent By PAR Index

Objective: To evaluate the effectiveness of orthodontic treatment inadults and adolescents with similar complexity of malocclusion with peerassessment rating (PAR) index, and guide the treatment strategy in orthodontictreatment according to the degree of improvement of this index before andafter treatment.Methods:1Subjects selected100adult(22male and78female),20to35years old (average age,23±4.4years), and100adolescents(33male and67female),12to15yearsold(average age,13±1.3years) were randomly selected from4500patientswho received orthodontic treatment in Department of Orthodontics, College ofStomatology, Hebei Medical University from2009to2012. Three patientswho did not receive complete treatment were excluded, finally,197patientswere included, including98adolescents and99adults.2Complexity classifiedPretreatment study models were scored with ICON index to assess thecomplexity of malocclusion. Three independent measurements were done onweekly. According to the average score of ICON, malocclusion was classifiedinto5degrees, Easy (＜29)；Mild (29-50); Moderate (51-63); Difficult(64-77); Very difficult (＞77). After classification,50patients wererespectively chosen from adult group and adolescent group. There were10male and40female in adult group,16male and34female in adolescent group,respectively. Eight patients(Easy),15patients(Mild),13patients(Moderate),10patients(Difficult), and4patients(Very difficult) were included in each group,which made the similar pretreatment complexity between the two groups. 3ScoredThe effectiveness was assessed using reduction in the weighted PARscore and percentage reduction in the weighted PAR score. The criteria forevaluation was classified into3degrees, including worse or no different(thepercentage reduction in the weighted PAR score was less than30%),improved (the percentage reduction in the weighted PAR score was more than30%)and great improved(reduction in weighted PAR score was more than22).4Statistical analysisThe data were analyzed by SPSS13.0. The value was presented asMedian (Inter-quartile range). The data was analyzed by Mann-Whitney test.P values less than0.05were considered statistically significant.Results:In adult group, no patient had been worse or no different,20patients hadbeen improved (40%),30patients had been greatly improved (60%), butpercentage reduction in the weighted PAR score had been more than70%.Accordingly, in adolescent group, no patient had been worse or no different,19patients had been improved (38%),31patients had been greatly improved(62%), but percentage reduction in the weighted PAR score had been morethan70%.There was no significant difference in the total effectiveness between thetwo groups (P>0.05). The reduction weighted PAR score and the percentagereduction in the weighted PAR score were24.5(14.5) and100(3%) in adultgroup,23(14.25) and100(7%) in adolescent group, respectively. Thereduction weighted PAR score of pretreatment and posttreatment variations intooth alignment, buccal occlusion, overjet, overbite, and midline discrepancieswere12(8),2(3),2(2),1(2), and0(1) in adult group,12.5(9),2(3),1(1),1(2),and0(0) in adolescent group, respectively. There was no significant differencein tooth alignment, buccal occlusion, overjet, overbite, and midlinediscrepancies between the two groups (P>0.05).Conclusions:Effectiveness of orthodontic treatment in adolescent and adult patients weresimilar. Malocclusion of most patients was greatly treated in department of orthodontics of our hospital.