Morphological study of distal furcation in mandibular first molars based on cone beam computed tomography images in Beijing population

doi:10.7518/hxkq.2024.2023348

Abstract

Abstract:

Objective This retrospective study explored the incidence of independent distal-lingual root (DLR) in mandibular first molars and the morphologic features of distal furcations through cone beam computed tomography (CBCT) in Beijing population. Methods A total of 401 CBCT images of both mandibular first molars existed were included. The sex of the patients, the incidence of DLR, the distal root trunk length (DRT), the locations of distal furcation entrance (DFE), and the separation angle of distal furcation (ADF) were recorded. Results The incidence rates of DLR were 33.2% on the subject level and 26.8% on the tooth level. The incidence of DLR was not different between genders but was higher on the right sides. The DRT values were 4.15 mm±1.02 mm. The ADF was 65.56°±11.56°. The DFE was located lingually, and 97.2% DFE was located more apically than buccal/lingual furcations. Conclusion A high incidence of DLR was found in the Beijing population. The DRT was longer than buccal and lingual sites. The DFE was located lingually with a wide separation. Understanding the morphological features of distal furcation can help clinicians to make proper treatment plans.

Key words: mandibular first molar, distal furcation, cone beam computed tomography

CLC Number:

R322.4⁺1

Zhu Jie, Liu Ya. Morphological study of distal furcation in mandibular first molars based on cone beam computed tomography images in Beijing population[J]. West China Journal of Stomatology, 2024, 42(3): 329-333.

Figures/Tables 4

References 21

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参考项目		有DLR	无DLR	DLR发生率	P值
性别	男性	59	116	33.7%	-
	女性	74	152	32.7%	0.838
	合计	133	268	33.2%	-
方位	左侧	93	308	23.1%	-
	右侧	122	279	30.4%^a	0.021*
	合计	215	587	26.8%	-

测量指标	例数	平均值	最小值	最大值
DRT/mm	202	4.15±1.02	2.2	9.2
DFE-舌侧牙体边缘的距离/mm	215	3.51±0.49	2.3	4.9
DFE颊舌向位置的比例	215	0.36±0.04	0.22	0.46
ADF/°	214	65.56±11.56	38.5	116.6

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