下颌前牙根管系统的解剖形态及其与三根型下颌第一恒磨牙关系的研究

doi:10.13591/j.cnki.kqyx.2025.01.009

Abstract

Abstract:

Objective To study the root canal morphology of permanent mandibular anterior teeth and explore its correlation with the occurrence of three-rooted mandibular molars using cone beam computed tomographic (CBCT) imaging. Methods CBCT image data of 200 subjects were randomly collected from dental clinics. The root canal morphology of the mandibular anterior teeth was identified and classified by Vertucci’s classification, and the root length and labio-lingual dimension at the tooth neck level were measured. The occurrence of three-rooted mandibular first molars was examined as well. The concurrence rates of double-canaled anterior teeth and three-rooted mandibular first molars at each side, and concurrence rates of bilateral double-canaled anterior teeth and three-rooted mandibular first molars were calculated. Spearman correlation tests were applied to analyze the correlation between the double-canaled anterior teeth and three-rooted mandibular first molars, as well as the bilateral antimetric teeth. Results The incidence of double-canaled system was 10.4%, 18.6% and 6.5% in mandibular central incisors, lateral incisors and canines, respectively; the bilateral concurrence rates were 5.7%, 11.1% and 3.0%, respectively, and Spearman correlation coefficients (rho) were 0.487, 0.505 and 0.440 (P<0.01), respectively; gender difference and side difference were not detected (P>0.05). The frequency of three-rooted mandibular first molars was 24.6%; gender difference was not detected (P>0.05), while the incidence was significantly higher at the right side (29.0%) than the left side (20.3%)(P<0.05). The bilateral concurrence rate was 17.4%, and a moderate correlation was detected (rho=0.666, P<0.01). The concurrence rates between the double-canaled anterior teeth and three-rooted mandibular first molars at each side were very low (2.6%-7.6%), and Spearman correlation tests demonstrated that no correlation (P>0.05) could be detected between them. Conclusion The lateral incisors exhibited the highest incidence of two root canals among the mandibular anterior teeth. Additionally, there was no significant correlation between three-rooted mandibular first molars and double-canaled mandibular anterior teeth.

Key words: mandibular anterior teeth, three-rooted mandibular first molar, root canal system, cone beam computed tomography

CLC Number:

R781.05

ZHU Peng, GU Yongchun, WU Yihan, XU Xiaoming. The root canal morphology of mandibular anterior teeth and its correlation with the occurrence of three-rooted mandibular first molars[J]. Stomatology, 2025, 45(1): 58-63.

Figures/Tables 11

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References 27

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项目	中切牙		侧切牙		尖牙
项目	根长	牙颈部唇舌径	根长	牙颈部唇舌径	根长	牙颈部唇舌径
左右侧
左侧	11.4±1.3	5.4±0.5	12.6±1.4	6.0±0.7	14.8±1.7	7.6±0.8
右侧	11.3±1.2	5.4±0.5	12.6±1.2	6.0±0.5	14.6±1.7	7.5±0.7
性别
男	11.7±1.3	5.6±0.4	12.8±1.3	6.1±0.5	15.1±1.9	7.9±0.8
女	11.0±1.0^**	5.3±0.4^**	12.3±1.2^**	5.9±0.7^**	14.3±1.4^**	7.2±0.5^**

项目	中切牙		侧切牙		尖牙
项目	单根管	双根管	单根管	双根管	单根管	双根管
左右侧
左侧	90.8	9.2	82.9	17.1	95.0	5.0
右侧	88.4	11.6	79.9	20.1	92.0	8.0
性别
男	89.9	10.1	79.9	20.1	95.5	4.5
女	89.2	10.8	82.9	17.1	91.5	8.5
合计	89.4	10.4	81.4	18.6	93.5	6.5

根管类型	中切牙	侧切牙	尖牙
1-1	352(89.6)	324(81.4)	374(93.5)
2-1	4(1.0)	21(5.3)	3(0.8)
1-2-1	19(4.8)	35(8.8)	12(3.0)
2-2	1(0.3)	2(0.5)	4(1.0)
1-2	17(4.3)	15(3.7)	7(1.7)
2-1-2	0(0)	1(0.3)	0(0)
合计	393(100.0)	398(100.0)	400(100.0)

项目	下颌中切牙			下颌侧切牙			下颌尖牙
项目	左侧双根管	左侧单根管	合计	左侧双根管	左侧单根管	合计	左侧双根管	左侧单根管	合计
右侧双根管	11	12	23	22	18	40	6	10	16
右侧单根管	7	163	170	12	146	158	4	180	184
合计	18	175	193	34	164	198	10	190	200
rho		0.487			0.505			0.440
P		0.000			0.000			0.000

下颌第一磨牙	男性			女性			合计
下颌第一磨牙	左侧三根	左侧双根	合计	左侧三根	左侧双根	合计	左侧三根	左侧双根	合计
右侧三根	15	10	25	16	9	25	31	19	50
右侧双根	2	67	69	2	57	59	4	124	128
合计	17	77	94	18	66	84	35	143	178
rho	0.655			0.675			0.666
P	0.000			0.000			0.000

The root canal morphology of mandibular anterior teeth and its correlation with the occurrence of three-rooted mandibular first molars

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下颌第一磨牙	中切牙			侧切牙			尖牙
下颌第一磨牙	双根管	单根管	合计	双根管	单根管	合计	双根管	单根管	合计
三根	5	33	38	5	34	39	7	32	39
双根	12	137	149	27	125	152	3	150	153
合计	17	170	187	32	159	191	10	182	192
rho	0.063			0.053			0.289
P	0.404			0.464			0.000

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