下颌近中阻生智齿拔除术对邻牙邻面接触强度的影响

doi:10.13591/j.cnki.kqyx.2024.12.006

摘要/Abstract

摘要：

目的探究不同类型下颌近中阻生第三磨牙拔除术对邻牙邻面接触强度(proximal contact strength,PCS)的影响。方法 110例下颌近中阻生第三磨牙,按阻生类型分为高位阻生组(40例)、中位阻生组(40例)、低位阻生组(30例)。分别在术前和术后采用高精度测力计对阻生牙邻牙(第二前磨牙L5和第一磨牙L6间、第一磨牙L6和第二磨牙L7间)的PCS进行测量,统计测量均数及标准差,分析各组拔牙前后PCS的差异。结果不考虑近中阻生牙分类时,下颌第三磨牙拔除术会导致L5/L6、L6/L7间PCS下降;在高位和中位阻生组中,下颌第三磨牙拔除术会导致L5/L6、L6/L7间PCS下降,而在低位阻生组中,L5/L6、L6/L7间PCS变化差异无统计学意义。结论近中高位和中位阻生的下颌第三磨牙拔除术会导致邻牙PCS显著降低,而近中低位下颌第三磨牙拔除术对邻牙PCS没有显著影响。

关键词: 第三磨牙, 近中阻生, 邻面接触强度

Abstract:

Objective To explore the influence of extracting different types of mandibular mesially impacted third molars on the proximal contact strength(PCS) of adjacent teeth. Methods One hundred and ten cases of mandibular mesially impacted third molars were divided into high impacted group(40 cases), middle impacted group(40 cases) and low impacted group(30 cases). The PCS of the adjacent teeth of impacted teeth(between the mandibular second premolar L5 and the mandibular first molar L6, and between the mandibular first molar L6 and the mandibular second molar L7) were measured by high-precision dynamometer before and after operation, and the mean and standard deviation were statistically measured. The differences of PCS before and after extraction in each group were analyzed. Results Without considering the classification of mesial impacted teeth, extraction of mandibular third molars led to the decrease in PCS of L5/L6 and L6/L7. In the high-middle impacted groups, the extraction of mandibular third molars led to the decrease in PCS of L5/L6 and L6/L7, while in the low impacted group, there was no statistical difference between the changes in PCS of L5/L6 and L6/L7. Conclusion The extraction of high-middle mandibular mesially impacted third molars can significantly reduce the adjacent teeth’s PCS, but the extraction of low mandibular mesially impacted third molars has no significant effect on the adjacent teeth’s PCS.

Key words: third molar, mesial impaction, proximal contact strength

中图分类号:

R782.11

许是, 陆展翼, 苗雷英. 下颌近中阻生智齿拔除术对邻牙邻面接触强度的影响[J]. 口腔医学, 2024, 44(12): 912-916.

XU Shi, LU Zhanyi, MIAO Leiying. Effect of extraction of mandibular mesially impacted wisdom teeth on the proximal contact strength[J]. Stomatology, 2024, 44(12): 912-916.

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牙位	例数	术前/N	术后/N	差值/N	t	P
L5/L6	110	3.07±1.27	2.84±1.10	0.23±0.95	2.53	0.013
L6/L7	110	3.09±1.43	2.82±1.24	0.27±1.00	2.87	0.005

分类	牙位	例数	术前	术后	差值	t	P
近中高位	L5/L6	40	3.03±1.31	2.73±1.19	0.30±0.92	2.09	0.043
近中中位	L5/L6	40	3.07±1.27	2.79±0.95	0.28±0.83	2.12	0.041
近中低位	L5/L6	30	3.11±1.25	3.05±1.17	0.06±1.14	0.31	0.759
近中高位	L6/L7	40	2.85±1.40	2.41±1.21	0.44±1.02	2.74	0.009
近中中位	L6/L7	40	3.41±1.53	2.96±1.33	0.45±0.91	3.11	0.004
近中低位	L6/L7	30	2.99±1.28	3.18±0.99	-0.19±0.98	1.02	0.316