Treatment of anterior open bites using non-extraction clear aligner therapy in adult patients
서희연, Garnett Bella Shen, Mahooda Kimberly, Mahjoub Noor, Boyd Robert L., 오희수,
소속 상세정보
서희연 ( Suh Hee-Yeon ) - University of the Pacific Department of Orthodontics
( Garnett Bella Shen ) - University of the Pacific Department of Orthodontics
( Mahooda Kimberly ) - University of the Pacific Department of Orthodontics
( Mahjoub Noor ) - Private practice
( Boyd Robert L. ) - University of the Pacific Department of Orthodontics
오희수 ( Oh Hee-Soo ) - University of the Pacific Department of Orthodontics
Abstract
Objective: The purpose of this study was to examine the effectiveness and mechanism of clear aligner therapy for the correction of anterior open bite in adult nonextraction cases.
Methods: Sixty-nine adult patients with anterior open bite were enrolled and classified into Angle’s Class I, II, and III groups. Fifty patients presented with skeletal open bite (mandibular plane angle [MPA] ≥ 38°), whereas 19 presented with dental open bite. Fifteen cephalometric landmarks were identified before (T1) and after (T2) treatment. The magnitudes of planned and actual movements of the incisors and molars were calculated.
Results: Positive overbite was achieved in 94% patients, with a mean final overbite of 1.1 ± 0.8 mm. The mean change in overbite was 3.3 ± 1.4 mm. With clear aligners alone, 0.36 ± 0.58 mm of maxillary molar intrusion was achieved. Compared with the Class I group, the Class II group showed greater maxillary molar intrusion and MPA reduction. The Class III group showed greater mandibular incisor extrusion with no significant vertical skeletal changes.
Conclusions: Clear aligners can be effective in controlling the vertical dimension and correcting mild to moderate anterior open bite in adult nonextraction cases. The treatment mechanism for Class III patients significantly differed from that for Class I and Class II patients. Maxillary incisor extrusion in patients with dental open bite and MPA reduction with mandibular incisor extrusion in patients with skeletal open bite are the most significant contributing factors for open bite losure.
키워드
Clear aligner; Orthodontic treatment; Tooth movement; Anterior open bite
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