Meissner Grit, Oehme Bernd, Strackeljan Jens, Kocher Thomas
Department of Restorative Dentistry, Periodontology and Endodontics, School of Dentistry, Germany.
J Clin Periodontol. 2006 Mar;33(3):195-9. doi: 10.1111/j.1600-051X.2006.00882.x.
We recently introduced an experimental surface detection system based on a conventional dental ultrasonic scaler. This device automatically discriminates cementum and dental calculus, which is the prerequisite for complete and thorough calculus removal. In the present study, the detection limits of this device were tested in vitro.
From 50 extracted teeth, subgingival calculus was gradually removed using a Gracey curette. During this stepwise procedure, detection properties of the surface detection system were continuously monitored and systematically verified until the system stopped discriminating calculus from the root surface. By measuring the diameter, circumference and area of the smallest, yet recognizable deposit, and of the no longer recognizable deposit, the cut-off point of the discriminative capability of the detection device was determined.
The cut-off points for the correct classification of residual deposits averaged on a diameter of 219 microm, an area of 21,600 microm2, and a circumference of 748 microm. This means a sensitivity of 73% and a specificity of 80% in this critical area.
This calculus detection system was able to detect small deposits. In clinical practice, this device may support dentists in deciding whether to stop or to continue the debridement.
我们最近推出了一种基于传统牙科超声洁治器的实验性表面检测系统。该设备能自动区分牙骨质和牙结石，这是彻底清除牙结石的前提条件。在本研究中，对该设备的检测限进行了体外测试。
从50颗拔除的牙齿上，使用格雷斯刮治器逐步清除龈下牙结石。在此逐步操作过程中，持续监测并系统验证表面检测系统的检测特性，直到该系统无法再区分牙结石和牙根表面。通过测量最小但仍可识别的沉积物以及不再可识别的沉积物的直径、周长和面积，确定了检测设备鉴别能力的临界点。
正确分类残留沉积物的临界点平均直径为219微米，面积为21600平方微米，周长为748微米。这意味着在这个关键区域灵敏度为73%，特异性为80%。
这种牙结石检测系统能够检测到小的沉积物。在临床实践中，该设备可能有助于牙医决定是停止还是继续进行清创。
