Jiang M, Zhao H Z, Li J X, Zhang T C, Xu W J, Li X, Zheng L L
Department of Orthodontics, Stomatological Hospital of Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2024 Feb 9;59(2):149-156. doi: 10.3760/cma.j.cn112144-20230901-00129.
To compare the impact of orthodontic treatment on pulp volume in adolescents and adults. Cone-beam CT data of 62 patients undergoing orthodontic treatment at the Department of Orthodontics, Stomatological Hospital of Chongqing Medical University, from January 2019 to March 2022 were collected. Patients were divided into two age groups (31 patients in each group): adolescent group (aged 13-17, 17 males and 14 females) and adult group (aged 21-25, 12 males and 19 females). Pre-and post-treatment reconstructions of the pulp and dental tissues of upper first molars (UM1) and lower central incisors (L1) were performed. Measurements included pulp volume for UM1 (UM1 P) and L1 (L1 P), pulp chamber volume (UM1 PC) and root canal volume (UM1 RC) for UM1, root length for L1 (L1 RL), and mesiobuccal root length for UM1 (UM1 RL), as well as chamber heights at specific landmarks [the lengths from the central fossa fusion site to the roof of the pulp chamber (H1), the floor of the pulp chamber (H2), the nearest point of root divergence as well as crown-root bifurcation (H3), the farthest point of root divergence (H4), and the pulp chamber height (H5)] in UM1. Changes in these indices were calculated and analyzed using paired and independent sample -tests for within-group and between-group differences, respectively. Pearson correlation was used to assess potential associations among H5, root length, and pulp volume changes. Before and after orthodontic treatment, no significant difference was observed in the adult group for L1 P (=-0.03, =0.975), while significant differences were noted for UM1 P, UM1 PC, and UM1 RC (=9.98, <0.001; =9.04, <0.001; =6.69, <0.001). In the adolescent group, significant differences were found for both L1 P and UM1 P (=2.25, =0.029; =6.30, <0.001). After orthodontic treatment, the absolute value changes of UM1 P, UM1 PC, and L1 P in the adolescent group were (19.75±9.58), (15.07±7.65) and (1.89±6.29) mm, respectively, and in the adult group were (13.33±9.41), (9.16±7.05) and (0.02±4.66) mm, respectively (=3.77, <0.001; =4.48, <0.001; =2.34, =0.048). There was no significant absolute difference in the amount of UM1 RC between the two groups after orthodontic treatment (=0.86, =0.391). Before and after orthodontic treatment, the absolute value changes of L1 RL, H1 and H5 in the adolescent group were (0.54±0.41), (0.38±0.27) and (0.71±0.33) mm, respectively, and the absolute value changes in the adult group were (0.78±0.62), (0.26±0.20) and (0.57±0.28) mm, respectively (=-2.43, =0.017; =2.96, =0.004; =2.57, =0.011). Whereas no significant differences were observed for UM1 RL, H2, H3, and H4 (=-0.85, =0.400; =0.43, =0.669; =-0.50, =0.619; =1.46, =0.148). Additionally, significant correlations were found between changes in H5 and UM1 RL with UM1 P (=0.35, <0.001; =0.19, =0.030), but not between Changes in L1 RL and L1 P (=0.11, >0.05). The effect of orthodontic treatment on pulp volume in adolescents and adults were different.
比较正畸治疗对青少年和成年人牙髓体积的影响。收集了2019年1月至2022年3月在重庆医科大学附属口腔医院正畸科接受正畸治疗的62例患者的锥形束CT数据。患者分为两个年龄组（每组31例）：青少年组（13 - 17岁，男17例，女14例）和成年组（21 - 25岁，男12例，女19例）。对上下颌第一磨牙（UM1）和下颌中切牙（L1）的牙髓和牙体组织进行治疗前和治疗后的重建。测量指标包括UM1的牙髓体积（UM1 P）和L1的牙髓体积（L1 P）、UM1的髓腔体积（UM1 PC）和根管体积（UM1 RC）、L1的根长（L1 RL）、UM1的近中颊根长度（UM1 RL），以及UM1特定标志点的髓腔高度[从中央窝融合部位到髓腔顶部的长度（H1）、髓腔底部的长度（H2）、根分歧及冠根分叉的最近点（H3）、根分歧的最远点（H4）以及髓腔高度（H5）]。使用配对样本检验和独立样本检验分别计算和分析这些指标在组内和组间的差异。采用Pearson相关性分析评估H5、根长和牙髓体积变化之间的潜在关联。正畸治疗前后，成年组L1 P无显著差异（=-0.03，=0.975），而UM1 P、UM1 PC和UM1 RC有显著差异（=9.98，< <0.001；=9.04，< <0.001；=6.69，< <0.001）。在青少年组，L1 P和UM1 P均有显著差异（=2.25，=0.029；=6.30，< <0.001）。正畸治疗后，青少年组UM1 P、UM1 PC和L1 P的绝对值变化分别为（19.75±9.58）、（15.07±7.6）和（1.89±6.29）mm，成年组分别为（13.33±9.41）、（9.16±7.05）和（0.02±4.66）mm（=3.77，< < <0.001；=4.48，< < <0.001；=2.34，=0.048）。正畸治疗后两组UM1 RC的绝对值差异无统计学意义（=0.86，=0.391）。正畸治疗前后，青少年组L1 RL、H1和H5的绝对值变化分别为（0.54±0.41）、（0.38±0.27）和（0.71±0.33）mm，成年组分别为（0.78±0.62）、（0.26±0.20）和（0.57±0.28）mm（=-2.43，=0.017；=2.96，=0.004；=2.57，=0.011）。而UM1 RL、H2、H3和H4无显著差异（=-0.85，=0.400；=0.43，=0.669；=-0.50，=0.619；=1.46，=0.148）。此外，发现H5和UM1 RL的变化与UM1 P之间存在显著相关性（=0.35，< < <0.001；=0.19，=0.030），但L1 RL的变化与L1 P之间无相关性（=0.11，>0.05）。正畸治疗对青少年和成年人牙髓体积的影响不同。
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