Unilateral Posterior Crossbite Case Summary

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According to Tweed analysis, the craniofacial difficulty of 36 was added to the space analysis difficulty of 30.05 to give a total difficulty of 66.05. This difficulty value put this case in the moderated difficulty case of correction. If FMA 21º-29º, the FMIA should be 67º. Thus, the FMIA in this case must be increased to improve balance and harmony in the lower face by uprighting mandibular incisors. 4. Diagnosis The patient was diagnosed as a Class III incisor relationship on a Class III skeletal pattern with unilateral posterior crossbite on left side. Total difficulty was calcified as the moderated difficulty case. 5. Treatment objectives The purposes of the treatment were to camouflage any remaining skeletal discrepancy, to establish Class I canine relationships, to upright the mandibular incisors, to create adequate overjet and overbite, to correct the mandibular midline and the unilateral posterior crossbite. 6. Treatment plan …show more content…

To normalize the class III misalignments, the best treatment option is to retrocline mandibular incisors until a positive overlap maintains. The malocclusion was treated with pre-adjusted (0.022 slot) brackets and leveling and alignment using a round 0.014 and 0.016 inch nickel-titanium archwire and a rectangular 0.016 × 0.022 inch nickel-titanium archwire. To align mandibular incisors, 2.5 mm interproximal reduction was performed at 5 anterior contacts (0.5 mm/contact). A rectangular 0.016 x 0.022 inch stainless steel archwire with lingual crown torque on the mandibular incisors was used to retrocline mandibular incisors. To correct the unilateral posterior crossbite, the cross elastics were used to uncross a group of teeth. For finishing, a rectangular 0.019 x 0.025 inch stainless steel archwire was used. After the active treatment phase, wraparound retainer was used for the maxilla and the

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