Sennerby Lars, Andersson Peter, Pagliani Luca, Giani Claudio, Moretti Giacomo, Molinari Massimo, Motroni Alessandro
Department of Oral and Maxillofacial Surgery, Institute of Odontology, University of Gothenburg, Gothenburg, Sweden.
Clinica Feltre, Feltre, Italy.
Clin Implant Dent Relat Res. 2015 Oct;17(5):844-53. doi: 10.1111/cid.12193. Epub 2013 Dec 27.
Bone density examination (BDE) using preoperative cone beam computed tomography (CBCT) might be used to predict primary implant stability in implant patients.
The aim of the study was to validate a novel CBCT scanner in vitro with regard to BDE in preoperative scans and to analyze the in vivo correlation of CBCT scan results with primary implant stability measurements.
A CBCT scanner was validated in vitro with regard to spatial uniformity and linearity of CT numbers (Hounsfield units, HU) by using a series of phantoms and plastic and hydroxyapatite specimens of various densities. Forty-nine patients (27 female and 22 male, mean age 55.6 ± 9.8) were scanned prior to and 1 to 6 months after the placement of 155 dental implants of different lengths and diameters. Mean and peak insertion torque (IT) in Ncm were registered during implant placement. Resonance frequency analysis (RFA) measurements in ISQ units were performed after placement. The second scan was used to export and superimpose the exact positions of bone and implants into the first scan. Virtual probes with the same length as the actual implant were automatically placed at the implant sites, and mean HU values were measured in a 1 mm-wide circular corridor from the tip of the threads and out.
The in vitro validation showed high uniformity and linearity of CT numbers (HU). The clinical study showed significant correlations between bone density and ISQ, mean IT, and peak IT, respectively.
The WhiteFox CBCT scanner measures bone density with high accuracy. There is a correlation between bone density and primary implant stability as assessed with IT and RFA measurements. The findings suggest that BDE may be used as an additional feature in treatment-planning software to estimate primary stability at predetermined implant sites.
使用术前锥形束计算机断层扫描（CBCT）进行骨密度检查（BDE）可能用于预测种植患者的种植体初期稳定性。
本研究旨在体外验证一种新型CBCT扫描仪在术前扫描中进行骨密度检查的性能，并分析CBCT扫描结果与种植体初期稳定性测量值之间的体内相关性。
通过使用一系列不同密度的体模、塑料和羟基磷灰石标本，在体外验证CBCT扫描仪在CT值（亨氏单位，HU）的空间均匀性和线性。对49例患者（27例女性和22例男性，平均年龄55.6±9.8岁）在植入155颗不同长度和直径的牙种植体之前以及植入后1至6个月进行扫描。在种植体植入过程中记录以Ncm为单位的平均和峰值植入扭矩（IT）。植入后进行共振频率分析（RFA）测量，单位为ISQ。第二次扫描用于将骨和种植体的精确位置导出并叠加到第一次扫描中。将与实际种植体长度相同的虚拟探针自动放置在种植体部位，并在从螺纹尖端向外1mm宽的圆形通道中测量平均HU值。
体外验证显示CT值（HU）具有高度均匀性和线性。临床研究表明骨密度与ISQ、平均IT和峰值IT之间分别存在显著相关性。
WhiteFox CBCT扫描仪能高精度测量骨密度。骨密度与通过IT和RFA测量评估的种植体初期稳定性之间存在相关性。研究结果表明，BDE可作为治疗计划软件中的一项附加功能，用于估计预定种植体部位的初期稳定性。
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