Department of Dentistry, Radboud University Medical Center;
Department of Dentistry, Radboud University Medical Center.
J Vis Exp. 2022 Jul 12(185). doi: 10.3791/63680.
Quantitative wear measurement is of increasing interest for measuring tooth wear progression. However, most research on quantitative wear measurement has focused on simulated wear or scanned gypsum casts. A 3D Wear Analysis (3DWA) protocol has been developed that analyzes tooth wear in vivo through intra-oral scanners available to dental clinicians. This study investigated the precision of the 3DWA protocol for measuring wear through maximum height loss (mm) and volume change (mm). Observational prospective wear data from 55 patients were analyzed after 0-1-, 0-3-, and 0-5-year intervals to determine rates of wear, and convenience samples were chosen to test the protocol's precision on dentitions scanned twice in one sitting and its intra- and inter-rater precision on scans with 0-3- and 0-5-year intervals. Scans were made using intra-oral scanners (IOS) and superimposed using 3D measurement software. T-tests were performed to determine the structural and random error, and trimmed ranges were calculated to interpret the error. For protocol precision, the mean difference was 0.015 mm (-0.002; 0.032, p = 0.076) for height and -0.111 mm (-0.250; 0.023, p = 0.101) for volume. The duplicate measurement error was 0.062 mm for height and 0.268 mm for volume. The height measurements were precise enough to measure wear after intervals of 0-3 or 0-5 years; however, volume measurements were susceptible to procedural error and operator sensitivity. The 3DWA protocol is precise enough to adequately measure tooth height loss after intervals of a minimum of 3 years or in patients with severe wear progression, but it is not suited to measuring volumetric changes.
定量磨损测量对于测量牙齿磨损进展越来越感兴趣。然而，大多数定量磨损测量研究都集中在模拟磨损或扫描石膏模型上。已经开发了一种 3D 磨损分析（3DWA）协议，该协议通过牙科临床医生可用的口腔内扫描仪分析体内牙齿磨损。本研究通过最大高度损失（mm）和体积变化（mm）来研究 3DWA 协议测量磨损的精度。在 0-1 年、0-3 年和 0-5 年的间隔时间内，对 55 名患者的观察性前瞻性磨损数据进行了分析，以确定磨损率，并选择方便样本来测试该协议在一次就诊中两次扫描的精度及其在 0-3 年和 0-5 年扫描间隔的内部和内部评估者精度。使用口腔内扫描仪（IOS）进行扫描，并使用 3D 测量软件进行叠加。进行了 t 检验以确定结构和随机误差，并计算了修剪范围以解释误差。对于协议精度，高度的平均差值为 0.015mm（-0.002；0.032，p=0.076），体积的平均差值为-0.111mm（-0.250；0.023，p=0.101）。重复测量误差为高度 0.062mm，体积 0.268mm。高度测量足以在 0-3 年或 0-5 年的间隔时间后测量磨损；然而，体积测量容易受到程序误差和操作人员灵敏度的影响。3DWA 协议足以精确测量至少 3 年后或在严重磨损进展的患者中牙齿高度损失，但不适合测量体积变化。
