Department of Prothodontics, Hebei Eye Hosipital, Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Xingtai, Hebei, China.
Department of Oral and Maxillofacial Surgery, Hebei Eye Hosipital, Hebei Provincial Key Laboratory of Ophthalmology, Hebei Clinical Medical Research Center of Eye Diseases, Xingtai, Hebei, China.
PLoS One. 2024 May 7;19(5):e0302810. doi: 10.1371/journal.pone.0302810. eCollection 2024.
The two commonly used diagnostic methods for taurodontism are susceptible to aging changes, mastication wear and other factors. Therefore, this study proposed an improved diagnostic method for taurodontism, and compared it with the previous two methods as a supplement for taurodontism diagnosis.
The included patients were aged 10-89 years and admitted to the Department of Stomatology of Hebei Eye Hospital from June 1, 2022 to May 31, 2023. Eighty cone-beam computed tomography images were divided equally into 4 groups: 10-29, 30-49, 50-69, and 70-89 years old. The right mandibular first molars were selected as measurement objects. Firstly, |BD| and taurodontism index (TI)-related parameters were measured using Shifman and Chanannel's method and crown-body(CB) and root (R) lengths was measured by Seow and Lai's method. The improved method used the length from the cementoenamel junction(CEJ) to the root bifurcation point(body, B)and the root length(root, R)as the measurement objects. Finally, TI, CB/R ratios, and B/R ratios were calculated according to the formulas given below. One-way ANOVA analysis was mainly used to compare the differences in the values, indices and ratios of taurodontism among different age groups (p<0.05).
With the increase of age, |BD| and TI values decreased significantly (p<0.01). The CB/R ratios of 70-89 years group were significantly lower than those of the other three groups (p<0.01). Ratios derived from the improved method were significantly lower in the 70-89 years than in 10-29 years group (p<0.05).
The |BD| and TI parameters proposed by Shifman and channel are significantly influenced by age. The measurements of Seow and Lai (CB/R ratios) were less affected by age compared with those of the former. The improved method(B/R ratios) was least affected by age, which would reduce error and bias in the measurement of taurodontism and obtain more objective results in older patients.
尖牙型双根管的两种常用诊断方法易受年龄变化、咀嚼磨损等因素的影响。因此，本研究提出了一种改良的尖牙型双根管诊断方法，并与前两种方法进行比较，作为尖牙型双根管诊断的补充。
纳入的患者年龄为 10-89 岁，于 2022 年 6 月 1 日至 2023 年 5 月 31 日在河北医科大学第二医院口腔一科就诊。共纳入 80 例锥形束 CT 图像，将其平均分为 4 组：10-29 岁组、30-49 岁组、50-69 岁组和 70-89 岁组。选择右侧下颌第一磨牙作为测量对象。首先，采用 Shifman 和 Chanannel 法测量 |BD|和尖牙型双根管指数（TI）相关参数，采用 Seow 和 Lai 法测量冠根（CB）和根（R）长度。改良方法采用从牙骨质-牙本质界（CEJ）到根分叉点（体，B）的长度和根长度（根，R）作为测量对象。最后，根据以下公式计算 TI、CB/R 比值和 B/R 比值。主要采用单因素方差分析比较不同年龄组尖牙型双根管的数值、指数和比值的差异（p<0.05）。
随着年龄的增长，|BD|和 TI 值显著降低（p<0.01）。70-89 岁组 CB/R 比值明显低于其他三组（p<0.01）。改良法得出的比值在 70-89 岁组明显低于 10-29 岁组（p<0.05）。
Shifman 和 channel 提出的 |BD|和 TI 参数受年龄影响显著。Seow 和 Lai 的测量值（CB/R 比值）受年龄影响较前者小。改良方法（B/R 比值）受年龄影响最小，可减少尖牙型双根管测量中的误差和偏差，在老年患者中获得更客观的结果。
