Chan Hsun-Liang, Fu Jia-Hui, Koticha Tapan, Benavides Erika, Wang Hom-Lay
*Clinical Adjunct Assistant Professor, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI. †Assistant Professor, Department of Preventive Dentistry (Periodontology) at the Faculty of Dentistry, National University of Singapore, Singapore. ‡Resident, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI. §Clinical Assistant Professor, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI. ‖Professor and Director, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI.
Implant Dent. 2013 Oct;22(5):552-8. doi: 10.1097/ID.0b013e3182a3333c.
The aim of this cadaver study was to evaluate the amount of ridge expansion with screw spreaders.
Eleven edentulous maxillae providing 20 eligible sites were used. Ridges with initial width of 3 to 6 mm were expanded using a set of 6 screw spreaders, and implants (ø3.7 × 10 mm) were subsequently placed. Ridge width at 2 mm apical to the crest was measured at the baseline, after expansion, and implant placement. Buccal plate thickness and incidence of buccal dehiscence after implant placement were measured.
The mean initial ridge width was 3.97 ± 0.82 mm. After the expansion, the mean ridge width increased to 4.76 ± 0.77 mm (Δ = 0.79 mm). Majority of sites (7/9 sites) with an initial ridge width of <4 mm had a buccal dehiscence after implant placement. A buccal plate thickness of ≥1 mm was consistently present in cases with an initial ridge width of ≥4.5 mm after implant placement.
The screw spreaders had a modest effect on ridge expansion. Their use might be limited because additional bone augmentation might be required to prevent or correct the bony dehiscence encountered in ridges <4.5 mm wide. Therefore, using this particular instrument kit for horizontal ridge augmentation is only indicated in specific cases.
本尸体研究的目的是评估使用螺钉撑开器进行牙槽嵴扩张的量。
使用了11具无牙上颌骨，提供了20个符合条件的部位。使用一套6个螺钉撑开器对初始宽度为3至6毫米的牙槽嵴进行扩张，随后植入种植体（ø3.7×10毫米）。在基线、扩张后和种植体植入后，测量牙槽嵴顶下方2毫米处的牙槽嵴宽度。测量种植体植入后的颊侧骨板厚度和颊侧裂开的发生率。
初始牙槽嵴平均宽度为3.97±0.82毫米。扩张后，牙槽嵴平均宽度增加到4.76±0.77毫米（Δ=0.79毫米）。初始牙槽嵴宽度<4毫米的大多数部位（7/9个部位）在种植体植入后出现颊侧裂开。种植体植入后，初始牙槽嵴宽度≥4.5毫米的病例中始终存在≥1毫米的颊侧骨板厚度。
螺钉撑开器对牙槽嵴扩张有适度效果。其使用可能受到限制，因为可能需要额外的骨增量来预防或纠正宽度<4.5毫米的牙槽嵴中遇到的骨裂开。因此，仅在特定情况下才建议使用这种特定的器械套件进行水平牙槽嵴增高。
