Nikolaev A V, Andreishchev A R, Kutukova S I
North-Western State Medical University Named After I.I. Mechnikov, Saint-Petersburg, Russia.
First Pavlov State Medical University of Saint-Petersburg, Saint-Petersburg, Russia.
Stomatologiia (Mosk). 2017;96(5):48-55. doi: 10.17116/stomat201796548-55.
The study objective was to compare the biomechanics of surgically assisted rapid palatal expansion (SARPE) with tooth-borne and bone-borne expanders. Materials include a sample of 54 cone-beam CT of 27 patients who underwent SARPE (bone-borne, n=21; tooth-borne, n=6) before treatment and at expander removal. Expansion efficacy was estimated by interapecal and intercoronal distances between maxillary canines, premolars and first molars as well as Coronal-Apical Index (CAI = coronal expansion (mm)/apical expansion (mm)). CAI varied between 1.5 and 2.0 in the group of patients with bone-borne appliances, and from 2.3 to 2.6 in the tooth-borne appliances group. The maximal amount of vestibular coronal declination was revealed in premolars by the use of tooth-borne appliances. Bone-borne appliances allowed lateralization of maxilla and the most prominent effect of tooth shift in a vestibular direction, which may be seen as the most important factors in a relapse prevention.
本研究的目的是比较手术辅助快速腭扩展（SARPE）与牙支持式和骨支持式扩弓器的生物力学。材料包括27例接受SARPE治疗的患者（骨支持式，n = 21；牙支持式，n = 6）治疗前和拆除扩弓器时的54份锥形束CT样本。通过上颌尖牙、前磨牙和第一磨牙之间的根尖间和冠间距离以及冠-根指数（CAI = 冠向扩展（mm）/根向扩展（mm））来评估扩展效果。在使用骨支持式矫治器的患者组中，CAI在1.5至2.0之间变化，而在牙支持式矫治器组中，CAI在2.3至2.6之间变化。使用牙支持式矫治器时，前磨牙的前庭冠向偏斜量最大。骨支持式矫治器可使上颌骨侧向移动，并且牙齿向前庭方向移动的效果最为显著，这可能被视为预防复发的最重要因素。
