Hildebolt C F, Pilgram T K, Yokoyama-Crothers N, Fletcher G, Helbig J L, Bartlett T Q, Gravier M, Vannier M W, Shrout M K
Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO 63110, USA.
J Clin Periodontol. 1998 Nov;25(11 Pt 1):850-6. doi: 10.1111/j.1600-051x.1998.tb02381.x.
Observer reliability in performing linear measurements between the cementoenamel junction and alveolar crest was determined for mandibular posterior teeth from digitized clinical bitewing radiographs acquired during recall examinations. 6 measurements (corresponding to traditional probing measurements) were made per tooth by 3 observers. Mesial and distal measurements made to the most coronal aspects of the alveolar crest were the most reliable and least biased. As was anticipated, intra-observer reliability was better than inter-observer reliability although the 3 observers of our study were able to detect a significant mean change (0.1 mm, p<0.0001) in alveolar bone height over a 1-year period for 10 patients. For our most reliable and unbiased measurements (mesial measurements to the alveolar crest), a change of 0.54 mm (90th percentile) would be required to indicate change at a site from one time to the next. Based on the reliability of our digital radiographic measurements, with the alpha error rate set at 0.05 and beta at 0.20, a difference in alveolar bone height of 0.3 mm could be detected with a patient sample size of between 13 (best case) and 54 (worst case).
在复诊检查期间获取的数字化临床咬合翼片上，对下颌后牙牙骨质釉质界与牙槽嵴之间进行线性测量时的观察者可靠性进行了测定。3名观察者对每颗牙齿进行6次测量（对应于传统探诊测量）。对牙槽嵴最冠方进行的近中及远中测量最为可靠且偏差最小。正如预期的那样，尽管我们研究中的3名观察者能够检测出10名患者在1年期间牙槽骨高度有显著的平均变化（0.1毫米，p<0.0001），但观察者内可靠性优于观察者间可靠性。对于我们最可靠且无偏差的测量（牙槽嵴近中测量），从一次到下一次测量时，位点变化需要0.54毫米（第90百分位数）才能表明有变化。基于我们数字放射测量的可靠性，将α错误率设定为0.05，β设定为0.20，在患者样本量为13（最佳情况）至54（最差情况）之间时，可检测到牙槽骨高度有0.3毫米的差异。
