Comparison of alveolar bone morphology after expansion with hybrid and conventional Hyrax expanders.

Ivan Silva, Felicia Miranda, José Carlos da Cunha Bastos, Daniela Garib
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Abstract

Objectives: To compare the buccal and palatal bone changes of maxillary posterior teeth produced by hybrid hyrax (HH) and conventional hyrax (CH) expanders in growing patients.

Material and methods: A sample of 32 patients with posterior crossbites in the late mixed dentition was recruited and randomly allocated into two groups. Group HH was composed of 18 individuals with a mean age of 10.7 years (six female, 12 male) treated with a hybrid expander with two anterior parasagittal miniscrews. Group CH was composed of 14 individuals with a mean age of 11.4 years (six female, eight male) treated with a conventional Hyrax expander. Cone-beam computed tomography (CBCT) exams were obtained before expansion (T1) and after 11 months when the expander was removed (T2). Buccal and palatal bone plate thickness and height of maxillary posterior teeth were measured. Intergroup comparisons were performed using t or Mann-Whitney tests (P < .05).

Results: The CH group showed greater decreases of the buccal bone plate height (mean change: 1.27 mm) at the maxillary first premolars compared to the HH group (mean change: 0.11 mm, P = .001). No intergroup difference was found for changes in the buccal and palatal bone thickness.

Conclusions: Hybrid expanders showed a tendency to cause less negative impact on the buccal bone plate height of first premolars compared to conventional Hyrax expanders. However, the difference was not clinically significant. Both hybrid and conventional Hyrax expanders are safe for the alveolar bone morphology in the late mixed dentition.

混合膨胀器和传统 Hyrax 膨胀器膨胀后牙槽骨形态的比较。
目的比较混合hyrax(HH)和传统hyrax(CH)扩颌器在生长期患者上颌后牙颊骨和腭骨的变化:招募了32名混合牙列晚期后交叉畸形患者,并将其随机分为两组。HH组有18名患者,平均年龄为10.7岁(6名女性,12名男性),使用带有两个前方副矢状小螺钉的混合扩弓器进行治疗。CH 组有 14 人,平均年龄为 11.4 岁(女性 6 人,男性 8 人),采用传统 Hyrax 扩胸器进行治疗。扩弓前(T1)和扩弓器取出 11 个月后(T2)分别进行了锥形束计算机断层扫描(CBCT)检查。对颊骨和腭骨板厚度以及上颌后牙高度进行了测量。组间比较采用 t 或 Mann-Whitney 检验(P < .05):结果:与 HH 组(平均变化:0.11 毫米,P = .001)相比,CH 组上颌第一前磨牙颊骨板高度的下降幅度更大(平均变化:1.27 毫米)。颊骨和腭骨厚度的变化没有发现组间差异:结论:与传统的Hyrax扩弓器相比,混合扩弓器对第一前磨牙颊侧骨板高度的负面影响较小。然而,这种差异在临床上并不显著。混合扩张器和传统 Hyrax 扩张器对混合牙列晚期的牙槽骨形态都是安全的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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