Rana Shailendra Singh, Vichare Sharvari, Gupta Abhishek, Rajagopalan Anjana, Kharbanda Om Prakash
Division of Orthodontics and Dentofacial Deformities, Department of Dentistry, All India Institute of Medical Sciences, Bathinda, India.
CSIR-Central Scientific Instruments Organisation (CSIO), Sector 30, Chandigarh, India.
J Oral Biol Craniofac Res. 2025 Jan-Feb;15(1):5-10. doi: 10.1016/j.jobcr.2024.10.011. Epub 2024 Nov 26.
This study aimed to compare a direct conventional 3D digital technique vis a vis a hybrid method in measuring palatal volume.
Thirty maxillary casts were obtained from the records of patients undergoing orthodontic treatment and pre-conceived boundaries of the palatal vault were marked. Sample was categorised into Group I (Volume estimation using CBCT scan) and Group II (Volume estimation using hybrid method). Estimation of the palatal volume in this study involved filling the volume of interest in the palate with gypsum (Type IV) stone material and carefully carving according to the boundaries and anatomy. This positive reproduction of the palatal space was safely retrieved and then scanned in the NewTom GiANO HR Cone Beam Imaging setup. The obtained scan was analysed in NNT Software Version 3.10 and the volume of the palate was calculated. Two experienced orthodontists carried out the measurements to evaluate the inter and intra-observer reliability. This was compared with the palatal volume calculated by the conventional digital method using CBCT in the NNT Software.
This study showed a consistent and narrow range of the confidence interval for palatal volume. Hence, the sample size was sufficient and had good precision. Considering a 95 % confidence interval, the intra-class correlation coefficient was robust (>0.9) for all measurements calculated by the hybrid method suggesting a high reliability. The mean difference in measurement of palatal volume (Group I vs, Group II) was 1.37 + 0.64 mm3 and the difference was statistically insignificant. Statistical -test conducted between the two methods showed a p-value of 0.34, implying no statistically significant difference between the two methods.
The hybrid method for evaluating the palatal volume is simple, accurate and comparable to the conventional digital method. A major advantage of this simplified method is that the patient is not exposed to any radiation of CBCT. Also, need for a specific skillset for digitally measuring the palatal volume is not a must.
本研究旨在比较直接传统三维数字技术与混合方法在测量腭部体积方面的差异。
从接受正畸治疗患者的记录中获取30个上颌模型，并标记出腭穹窿的预设边界。样本分为第一组（使用锥形束计算机断层扫描（CBCT）扫描估计体积）和第二组（使用混合方法估计体积）。本研究中腭部体积的估计包括用石膏（IV型）石料填充腭部感兴趣的体积，并根据边界和解剖结构仔细雕刻。将腭部空间的这种正性复制安全取出，然后在NewTom GiANO HR锥形束成像设备中进行扫描。在NNT软件版本3.10中分析获得的扫描图像，并计算腭部体积。两名经验丰富的正畸医生进行测量，以评估观察者间和观察者内的可靠性。将其与在NNT软件中使用CBCT通过传统数字方法计算的腭部体积进行比较。
本研究显示腭部体积的置信区间范围一致且狭窄。因此，样本量足够且精度良好。考虑95%的置信区间，混合方法计算的所有测量值的组内相关系数均很强（>0.9），表明可靠性高。腭部体积测量的平均差异（第一组与第二组）为1.37 + 0.64 mm³，差异无统计学意义。两种方法之间进行的统计学检验显示p值为0.34，这意味着两种方法之间无统计学显著差异。
评估腭部体积的混合方法简单、准确，且与传统数字方法相当。这种简化方法的一个主要优点是患者无需接受CBCT的任何辐射。此外，也不一定需要用于数字测量腭部体积的特定技能。
