低剂量CBCT在口腔种植领域应用的回顾性研究

doi:10.13701/j.cnki.kqyxyj.2026.02.005

摘要/Abstract

摘要： 目的: 对比锥形束CT(cone beam CT, CBCT)低剂量与常规剂量用于口腔种植拍摄的图像质量与线距测量准确性,探讨低剂量CBCT的临床应用可行性。方法: 回顾性纳入60例种植患者(上下颌各30例),这些患者均使用Planmeca ProMax 3D Mid设备拍摄CBCT, 术前为常规剂量模式(90 kV,8 mA,18 s),术后为低剂量模式(90 kV,7.1 mA,6 s);记录常规剂量和低剂量模式下的入射体表剂量(dose area product,DAP)及CT剂量指数(computed tomography dose index,CTDI)。对下颌种植的下颌管、上颌种植的上颌窦底壁的清晰度进行评分(1~3分)。对4个线距指标进行测量,分别为下颌种植患者下颌尖牙牙根长度(H1);上颌种植患者上颌中切牙牙根长度(H2);下颌种植患者下颌第一磨牙根分叉处下颌管下壁至下颌骨下缘的距离(H3);上颌种植患者上颌中切牙根尖至鼻底的距离(H4)。使用SPSS 27.0对清晰度评分和线性指标差异进行统计学分析。结果: 与常规剂量相比,低剂量模式DAP与CTDI均下降了70.4%。低剂量与常规剂量CBCT的下颌管清晰度评分及上颌窦底壁清晰度评分比较无统计学差异(P=0.707,P=0.135)。两组间4个线距测量的配对t检验的结果比较无统计学差异(P_H1=0.963,P_H2=0.384,P_H3=0.615,P_H4=0.118)。结论: 本研究所使用的CBCT机型通过适当降低电流及扫描时间实现的低剂量扫描对种植患者图像清晰度及线距测量无明显影响,在临床上推荐使用低剂量模式进行种植检查以降低患者辐射剂量。

关键词: 口腔种植, 锥形束CT, 低剂量, 常规剂量

Abstract: Objective: To compare the image quality and accuracy between low-dose and standard-dose cone beam CT (CBCT) and explore the clinical feasibility of low-dose CBCT in oral implantology. Methods: This retrospective study included 60 implant patients (30 maxillary and 30 mandibular cases). Preoperative standard-dose CBCT (90 kV, 8 mA, 18 s) and postoperative low-dose CBCT (90 kV, 7.1 mA, 6 s) images were acquired using Planmeca ProMax 3D Mid device. Radiation doses included dose area product (DAP) and computed tomography dose index (CTDI) were recorded. Image quality of the mandibular canal and maxillary sinus floor was scored (1-3 points), and four linear measurements were performed: root length of mandibular canines (H1), root length of maxillary central incisors (H2), distance from the mandibular canal inferior floor to the inferior mandibular border at the bifurcation of mandibular first molar region (H3), and distance from the root apex of maxillary central incisors to the nasal floor (H4). Results: Compared to the standard-dose protocol, DAP and CTDI in low-dose protocol both decreased by 70.4%. No significant differences were observed in image quality scores (mandibular canal=0.707; maxillary sinus floor: P=0.135) or linear measurements (P_H1=0.963; P_H2=0.384; P_H3=0.615; P_H4=0.118). Conclusion: Low-dose protocol by appropriately reducing current and scanning time had no significant effect on image quality and linear measurements for implant patients. It is recommended to use the low-dose protocol for implant patient to reduce radiation dose.

Key words: oral implant, CBCT, low-dose, standard-dose

倪瑞阳, 文珊辉, 刘安琪, 林梓桐. 低剂量CBCT在口腔种植领域应用的回顾性研究[J]. 口腔医学研究, 2026, 42(2): 110-114.

NI Ruiyang, WEN Shanhui, LIU Anqi, LIN Zitong. Clinical Application of Low-dose CBCT in Oral Implantology: A Retrospective Study[J]. Journal of Oral Science Research, 2026, 42(2): 110-114.

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