Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Unilateral cross bite treated by corticotomy-assisted expansion: two case reports | Hassan et al. Head Face Medicine 2010 6 6 http content 6 1 6 HEAD FACE MEDICINE CASE REPORT Open Access Unilateral cross bite treated by corticotomy-assisted expansion two case reports Ali H Hassan 1 Ali T AlGhamdi2 Ahmad A Al-Fraidi3 Aziza Al-Hubail3 and Manar K Hajrassy3 Abstract Background True unilateral posterior crossbite in adults is a challenging malocclusion to treat. Conventional expansion methods are expected to have some shortcomings. The aim of this paper is to introduce a new technique for treating unilateral posterior crossbite in adults namely corticotomy-assisted expansion CAE applied on two adult patients one with a true unilateral crossbite and the other with an asymmetrical bilateral crossbite both treated via modified corticotomy techniques and fixed orthodontic appliances. Methods Two cases with asymmetric maxillary constriction were treated using CAE. Results In both cases effective asymmetrical expansion was achieved using CAE and functional occlusion was established as well. Conclusions Unilateral CAE presents an effective and reliable technique to treat true unilateral crossbite. Background Unilateral posterior crossbite is not an uncommon malocclusion encountered in daily orthodontic practice. Several studies reported a prevalence that varied between 8 and 23 1-4 . The condition may result from dental tipping a skeletal deficiency or a cleft palate. A unilateral posterior crossbite involving multiple teeth can be classified as either a functional posterior crossbite or a true unilateral crossbite 5 . In a functional posterior crossbite the presence of an occlusal interference causes a shift of the mandible upon closure 5-7 . Bilateral maxillary expansion is usually recommended as the standard treatment for a functional crossbite since the discrepancy between the maxillary width and the mandibular width is usually due to insufficient maxillary width 6-13 . A true unilateral crossbite is more problematic and requires .
