Correlation between the thickness of the crestal and buccolingual cortical bone at varying depths and implant stability quotients

Background/purposeResonance frequency analysis (RFA) is clinically used in dentistry to access the stiffness of dental implants in surrounding bone. However, the clear advantages and disadvantages of this method are still inconclusive. The aim of this study was to investigate and compare implant stability quotient (ISQ) values obtained from RFA with parameters obtained from a cone beam computed tomography (CBCT) scan of the same region.Materials and methodsNineteen implants (Conelog) were inserted in the posterior maxillary and mandibular partially edentulous regions of 16 patients. At the time of implant placement, the ISQ values were obtained using RFA (Osstell). CBCT was used to measure the thickness of the crestal, cortical, buccolingual cortical, and cancellous bone at 3, 6, and 9 mm below the crestal bone level, as indicated by radiographic markers. The ratio of the thickness of the cortical to cancellous bone at varying depths was also calculated and classified into 4 groups (Group 1–4).ResultsThere was a strong correlation between the crestal cortical bone thickness and ISQ values (PConclusionThis study showed that the ISQ values obtained from RFA highly correlated with the quantity and quality of bone 3 mm below the crestal bone level. The correlation between the ISQ and bone surrounding the implant site was dependent on the depth of measurement. Therefore, RFA can help to predict the marginal bone level, as confirmed in this study.研究背景与目的：共振频率分析（Resonance Frequency Analysis，RFA）在口腔临床中用于评估牙种植体周围骨的硬度，但该方法的明确优缺点仍无定论。本研究旨在探究并对比通过RFA获取的种植体稳定性指数（Implant Stability Quotient，ISQ）值，与同一区域锥形束计算机断层扫描（Cone Beam Computed Tomography，CBCT）扫描所得参数的差异。 材料与方法：19枚Conelog种植体被植入16例患者的上颌后牙区及下颌部分缺牙区域。种植体植入时，采用Osstell设备通过RFA获取ISQ值。通过CBCT测量牙槽嵴顶下方3mm、6mm、9mm处的嵴顶皮质骨、颊舌侧皮质骨及松质骨厚度，测量依据为放射标记物。同时计算不同深度处皮质骨与松质骨的厚度比，并将其分为4组（第1~4组）。 结果：嵴顶皮质骨厚度与ISQ值存在强相关性（P）。 结论：本研究表明，通过RFA获取的ISQ值与牙槽嵴顶下方3mm处骨的数量及质量高度相关。种植体周围骨的ISQ值与骨的相关性依赖于测量深度。因此，本研究证实，RFA可辅助预测边缘骨水平。