Johansson Kristina, Paulsson Liselotte, Christell Helena
Faculty of Odontology, Malmö University, Malmö, Sweden.
Department of Orthodontics, Östersund Hospital, Östersund, Sweden.
Biomater Investig Dent. 2024 Aug 22;11:41161. doi: 10.2340/biid.v11.41161. eCollection 2024.
To assess inter- and intrarater reliability and agreement for measurements of root lengths using multiplanar reconstruction (MPR) in cone beam computed tomography (CBCT) examinations.Furthermore, to determine whether using MPR from different CBCT machines was a reliable and reproducible method for assessment of root length during orthodontic treatment of adolescents.
A total of 40 CBCT examinations obtained before, during and after orthodontic treatment of 14 adolescents, with fixed appliances from a multicentre randomised controlled trial, were used. All roots from the incisors to the first molars were measured by two independent raters and in accordance with a protocol preceded by a multi-step calibration. Reliability was assessed by intra class correlation (ICC). Agreement was assessed by measurement error according to the Dahlberg formula and Bland-Altman plot.
The number of repeated measurements varied from 436 to 474 for the different timepoints. Good to excellent inter- and intrarater reliability for different tooth groups and timepoints were shown. Measurement error for inter- and intrarater agreement varied between 0.41 mm and 0.77 mm. The Bland-Altman plot with 95% limits of agreement varied between +1.43 mm and -2.01 mm for different tooth groups and timepoints.
The results of this study indicate that CBCT using MPR from different machines is a reproducible method for measuring root length during different phases of orthodontic treatment. When interpreting root shortening measurements in CBCT using MPR for clinical or research purposes, values below 2 mm should be approached with caution, as they may contain measurement errors.
在锥形束计算机断层扫描（CBCT）检查中，使用多平面重建（MPR）评估牙根长度测量的评分者间和评分者内信度及一致性。此外，确定在青少年正畸治疗期间，使用不同CBCT机器的MPR评估牙根长度是否为一种可靠且可重复的方法。
使用了来自一项多中心随机对照试验的14名青少年正畸治疗前、治疗期间和治疗后的40次CBCT检查，这些青少年均佩戴固定矫治器。两名独立的评分者按照多步骤校准后的方案，测量了从切牙到第一磨牙的所有牙根。通过组内相关系数（ICC）评估信度。根据达尔伯格公式和布兰德-奥特曼图，通过测量误差评估一致性。
不同时间点的重复测量次数在436至474次之间。不同牙组和时间点均显示出良好至优秀的评分者间和评分者内信度。评分者间和评分者内一致性的测量误差在0.41毫米至0.77毫米之间。不同牙组和时间点的布兰德-奥特曼图的95%一致性界限在+1.43毫米至-2.01毫米之间。
本研究结果表明，在正畸治疗的不同阶段，使用不同机器的MPR进行CBCT扫描是测量牙根长度的一种可重复方法。当出于临床或研究目的，在使用MPR的CBCT中解释牙根缩短测量值时，对于低于2毫米的值应谨慎对待，因为它们可能包含测量误差。
