Skeletal and dentoalveolar effects of different types of microimplant-assisted rapid palatal expansion
최형윤, 이상민, 이진우, 정동화, 이모현,
소속 상세정보
최형윤 ( Choi Hyeong-Yoon ) -
이상민 ( Lee Sang-Min ) -
이진우 ( Lee Jin-Woo ) -
정동화 ( Chung Dong-Hwa ) -
이모현 ( Lee Mo-Hyeon ) -
Abstract
Objective: To evaluate the following null hypothesis: the skeletal and dentoalveolar expansion patterns in the coronal and axial planes are not different with two different types of microimplant-assisted rapid palatal expansion (MARPE) systems.
Methods: Pretreatment (T0) and post-MARPE (T1) cone-beam computed tomography (CBCT) images of 32 patients (14 males and 18 females; mean age, 19.37) were analyzed. We compared two different MARPE systems. One MARPE system included the maxillary first premolars, maxillary first molars, and four microimplants as anchors (U46 type, n = 16), while the other included only the maxillary first molars and microimplants as anchors (U6 type, n = 16).
Results: In the molar region of the U6 and U46 groups, the transverse expansion at the midnasal, basal, alveolar, and dental levels was 2.64, 3.52, 4.46, and 6.32 mm and 2.17, 2.56, 2.73, and 5.71 mm, respectively. A significant difference was observed in the posterior alveolar-level expansion (p = 0.036) and posterior basal-bone-level expansion (p = 0.043) between the groups, with greater posterior skeletal and alveolar expansion in the U6 group.
Conclusions: Compared with the U46 group, the U6 group showed greater posterior expansion at the alveolar and basal-bone levels, with an almost parallel split. Both groups showed a pyramidal expansion pattern in the coronal view.
키워드
Microimplant-assisted rapid palatal expansion; Maxillary transverse discrepancy; Cone-beam computed tomography; Bicortical engagement
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