Background

Transcrestal sinus floor elevation is a reliable procedure when additional bone height is needed for maxillary implant placement. However, the grafted bone undergoes remodeling and the dimensional stability of grafted bone height may be affected by several clinical factors, including graft material, sinus anatomy and the morphology of grafted space.

Methods

This retrospective study examined patients who had undergone transcrestal sinus floor elevation with synthetic biphasic calcium phosphate and single implant placement. The reduction of sinus graft height (GHR) after 6–8 months healing period was measured with cone-beam computed tomography (CBCT) images. Correlating factors, including vertical amount of implant protrusion (IP), sinus width, and the morphology of grafted space were analyzed by Spearman's correlation test.

Results

A total of 25 implant sites were analyzed. The mean GHR was 0.57 ± 0.49 mm, which was positively correlated with IP, vertical elevation height (VEH), and the ratio of vertical to horizontal elevation of the grafted space. However, GHR was not correlated with sinus width and mesial-distal or buccal-palatal width of the grafted space.

Conclusions

Synthetic biphasic calcium phosphate used in transcrestal sinus floor elevation underwent shrinkages and graft remodeling. Grafted height reduction was associated with IP, VEH, and the ratio of vertical to horizontal elevation of the grafted space.

中文翻译：

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经牙槽突窦底抬高后的移植骨重塑：锥形束计算机断层扫描研究

背景

当上颌种植体植入需要额外的骨高度时，经牙槽骨窦底抬高是一种可靠的手术。然而，移植骨会发生重塑，移植骨高度的尺寸稳定性可能会受到多种临床因素的影响，包括移植材料、鼻窦解剖结构和移植间隙的形态。

方法

这项回顾性研究检查了使用合成双相磷酸钙和单一植入物进行经牙窦底抬高术的患者。使用锥形束计算机断层扫描 (CBCT) 图像测量 6-8 个月愈合期后鼻窦移植物高度 (GHR) 的降低。相关因素包括种植体突出量（IP）、窦道宽度和移植间隙的形态，通过Spearman相关性检验进行分析。

结果

共分析了 25 个植入部位。平均 GHR 为 0.57 ± 0.49 mm，与 IP、垂直高度 (VEH) 以及移植空间的垂直与水平高度之比呈正相关。然而，GHR 与鼻窦宽度和移植间隙的近中-远中或颊-腭宽度无关。

结论

用于经牙槽底窦底抬高的合成双相磷酸钙经历了收缩和移植物重塑。移植高度降低与 IP、VEH 和移植空间的垂直与水平高度比相关。