Comparison of mandibular anterior repositioning appliance (MARA) and Crown Herbst in treatment of Class II malocclusion
Almunajjed Allahham, Nour
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Objectives: The purpose of this study is to evaluate and compare the skeletal and dentoalveolar effects of the Stainless Steel Edgewise Crown Herbst, and the MARA Device in the treatment of the class II malocclusion in adolescent patients. Materials and methods: This study is a retrospective clinical trial which was conducted on records for Class II patients who were treated with two different appliances. Results were compared with an untreated control group. The first group consists of 34 patients (mean age 11.4 ± 2.03) who were treated with MARA, the second group consists of 28 patients (mean age 11.7 ± 1.66) who were treated with edgewise crown Herbst, and the third group was a class II untreated control group which had 25 subjects (mean age 12.6 ± 0.91). Lateral cephalograms were taken before functional appliance placement [T1] and after functional appliance removal [T2] to evaluate treatment effects. Analyses of Variances (ANOVA) followed by TukeyHSD post-hoc test were used to compare changes between groups at p Results: Both Herbst and MARA appliances showed favorable skeletal and dental effects in normalizing class II relations, the mandibular length and the ramus height increased, and the convexity decreased. Overjet decreased significantly in Herbst (-6.19mm) more than MARA (-2.46mm). Molar relation significantly improved more in Herbst (-5.32mm) than in MARA (-3.10mm). Both Herbst and MARA caused significant lower incisors protrusion (3.19 mm in MARA and 2.93 mm in Herbst), there was no statistically differences between the two appliances in term of the incisor position changes. Conclusions: Both appliances led to successful correction of the class II relations; The Herbst appliance showed more significant improve in molar relation correction, and overjet reduction than the MARA appliance. Both Herbst and MARA appliances led to successful correction of class II relations in adolescent patients, skeletal and dental effects contributed in this correction.