跨下牙槽神经种植相关解剖结构的影像学测量及分析研究

doi:10.13591/j.cnki.kqyx.2023.02.007

Abstract

Abstract:

Objective To measure the position of the mandibular nerve canal at the mandibular second molar by CBCT image data, analyze the theoretical implantation range of trans-alveolar implantation, and provide a theoretical solution to insufficiency of posterior mandibular bone volume in clinical practice. Methods Eighty patients with missing mandibular second molars whose vertical bone height of the edentulous area was less than 9 mm were selected for CBCT image measurement, and the distances from the mandibular nerve canal to the buccal cortex, lingual cortex, and alveolar crest were measured to simulate trans-inferior alveolar nerve implantation. The angular range of the buccolingual inclination of the implant was also measured. Results The distances from the mandibular nerve canal to the buccal cortex, lingual cortex and alveolar crest at the mandibular second molar were(6.913±1.222)mm, (2.859±0.891)mm and (7.991±0.783)mm, respectively. The distance from the mandibular nerve canal to the buccal cortex was significantly greater than that to the lingual cortex. And, 75% of the patients could be implanted by the inferior alveolar nerve. The minimum angle of buccolingual inclination of the simulated implant was 19.360°±7.086°, and the maximum angle was 39.462°±6.924°. Conclusion The mandibular nerve canal at the mandibular second molar is inclined toward the lingual side, which ensures sufficient buccal bone volume. Most patients with severe mandibular atrophy can still adopt implants of conventional length by trans-inferior alveolar nerve implantation to keep a safe distance from the nerve canal.

Key words: mandibular second molar, trans-inferior alveolar nerve implantation, CBCT, mandibular atrophy

CLC Number:

R783.4

LIU Jinming,WU Wenli,DU Lingyi,SHEN Ming. Radiological measurement and analysis of trans-inferior alveolar nerve implantation[J]. Stomatology, 2023, 43(2): 130-134.

Figures/Tables 5

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References 29

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分组		n	颊侧骨皮质/mm	舌侧骨皮质/mm	牙槽嵴顶/mm	t₃	P₃
性别	男	36	7.016±1.123	2.848±0.988	8.173±0.666	16.717	0.000
	女	44	6.829±1.305	2.869±0.814	7.842±0.846	17.081	0.000
	t₁		-0.678	0.105	-1.914
	P₁		0.500	0.916	0.059
位置	右	45	7.056±1.239	2.809±0.727	8.066±0.804	19.832	0.000
	左	35	6.730±1.193	2.925±1.074	7.895±0.757	14.027	0.000
	t₂		-1.190	0.575	-0.970
	P₂		0.238	0.567	0.335
合计		80	6.913±1.222	2.859±0.891	7.991±0.783	23.971	0.000

分组		可放入4.1 mm×10.0 mm 种植体的样本数	样本总量	占比/%
性别	男	28	36	77.78
	女	32	44	72.73
	合计	60	80	75.00
位置	左	24	35	68.57
	右	36	45	80.00
	合计	60	80	75.00

分组		可放入超短种植体的样本数	样本总量	占比/%
性别	男	2	6	33.33
	女	9	14	64.29
	合计	11	20	55.00
位置	右	5	9	55.56
	左	6	11	54.55
	合计	11	20	55.00

分组		最小角度/(°)	最大角度/(°)
性别	男	18.220±8.244	39.278±8.285
	女	20.358±5.845	39.622±5.603
	t	-1.169	-0.191
	P	0.247	0.849
位置	右	19.035±6.282	38.828±6.193
	左	19.847±8.266	40.412±8.003
	t	0.315	1.038
	P	0.754	0.304
合计		19.360±7.086	39.462±6.924

Radiological measurement and analysis of trans-inferior alveolar nerve implantation

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