OBJECTIVES/AIMS To determine whether a clinically available resonance frequency analysis (RFA) device (Osstell Mentor), designed to assess implant integration, could identify a single uncemented retainer on fixed-fixed bridges, in vitro. MATERIALS AND METHODS All-metal fixed-fixed bridges were cemented to acrylic tooth analogue abutments with simulated periodontal ligaments. Dental stone bases provided 100 or 50% 'bone support' groups (n = 50 in each). Control groups had both retainers cemented, whereas the test groups had the 'premolar' uncemented, mimicking clinical failure. A RFA device was used to measure bridge stability, expressed as a modified Implant Stability Quotient (Bridge Stability Quotient-BSQ) from a Smartpeg temporarily affixed to the bridge via composite. RESULTS The BSQ recorded at the premolar site in both 100 and 50% support models demonstrated highly statistically significant differences (P <0.003) between the control and test groups. Sensitivity and specificity, area under the curve (receiver operating characteristic), analyses showed moderate test accuracy (0.735) for the 100% support group and good accuracy (0.96) for the 50% support group. CONCLUSION The investigation suggests that RFA measurements were able to identify, reliably and non-destructively, in vitro, fixed-fixed bridges where the anterior retainer was uncemented. Further clinical research is required to determine whether this technique may allow early diagnosis of failing bridgework.

中文翻译：

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用于测量固定电桥稳定性的共振频率分析的体外评估。

目的/目的 确定临床上可用的共振频率分析 (RFA) 设备 (Osstell Mentor) 是否可以在体外识别固定桥上的单个非骨水泥固位体。材料和方法 使用模拟牙周韧带将全金属固定桥粘接到丙烯酸牙模拟基台上。牙石基底提供了 100 或 50% 的“骨支撑”组（每组 n = 50）。对照组的两个保持器均已粘接，而测试组的“前磨牙”未粘接，模拟临床失败。使用 RFA 设备测量桥的稳定性，表示为来自通过复合材料临时固定到桥上的 Smartpeg 的修改后的种植体稳定性商（桥稳定性商-BSQ）。结果 100% 和 50% 支持模型在前磨牙部位记录的 BSQ 显示对照组和测试组之间的高度统计学显着差异 (P <0.003)。敏感性和特异性、曲线下面积（接受者操作特征）分析显示，100% 支持组的测试准确度适中（0.735），50% 支持组的测试准确度良好（0.96）。结论 调查表明，RFA 测量能够可靠且无损地识别体外固定桥，其中前保持器未粘合。需要进一步的临床研究来确定这种技术是否可以对失败的桥梁进行早期诊断。敏感性和特异性、曲线下面积（接受者操作特征）分析显示，100% 支持组的测试准确度适中（0.735），50% 支持组的测试准确度良好（0.96）。结论 调查表明，RFA 测量能够可靠且无损地识别体外固定桥，其中前保持器未粘合。需要进一步的临床研究来确定这种技术是否可以对失败的桥梁进行早期诊断。敏感性和特异性、曲线下面积（接受者操作特征）分析显示，100% 支持组的测试准确度适中（0.735），50% 支持组的测试准确度良好（0.96）。结论 调查表明，RFA 测量能够可靠且无损地识别体外固定桥，其中前保持器未粘合。需要进一步的临床研究来确定这种技术是否可以对失败的桥梁进行早期诊断。前保持器未粘合的固定固定桥。需要进一步的临床研究来确定这种技术是否可以对失败的桥梁进行早期诊断。前保持器未粘合的固定固定桥。需要进一步的临床研究来确定这种技术是否可以对失败的桥梁进行早期诊断。