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1lnbskullxr

Published: August 9, 2026Updated: August 16, 2026

一种通过头颅X线片测量下切牙相对于颌骨位置的头颅测量学检查，用于评估牙齿和颌骨关系。

Quick summary

{通过头颅X线片测量下切牙与颌骨的相对位置关系,主要用于正畸治疗计划和颌面外科诊断,帮助评估面部比例和牙齿排列情况,是一种无痛的影像学检查,测量结果用于制定个性化治疗方案}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
60604-6
Short code
Lower incisal edge to NB line
Synonyms
1L-NB Skull XR
Category
chemistry
Sample
serum
Container
N/A - Radiographic examination
Units
N/A
Ref low
18
Ref high
24
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr-measured
CPT
70350 (Cephalometric X-ray, skull)
SNOMED
363679005
Specimen volume
N/A
Stability
N/A
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
24–72 hours
Order
routine

这是什么测试？

下切牙垂直于鼻根-B点连线测量是一种头颅测量学检查，通过分析头颅X线侧位片来测量下切牙（下方门牙）相对于上下颌骨的位置。这项测量是口腔正畸和颌面外科常用的专业检查方法，帮助医生评估牙齿与颌骨的相对关系，了解面部发育情况。

为什么需要这项检查？

这项检查主要用于：1）正畸治疗前的诊断和方案制定，帮助医生判断是否需要拔牙或采用其他矫正方法；2）评估颌骨发育是否正常；3）面部比例分析和美学评估；4）术前评估和术后效果对比；5）监测治疗进展和预测治疗效果。

检查过程是怎样的？

检查需要拍摄头颅侧位X线片。患者站立或坐直，头部固定在标准位置，拍摄一张侧面X线片。拍摄过程快速、无痛，辐射剂量很低。拍摄完成后，专业医生会在X线片上标记鼻根点（Nasion）、B点和下切牙缘，然后测量它们之间的角度和距离关系。

检查前需要做什么准备？

检查前请取下耳环、项链、发夹等金属物品，以免影响成像效果。女性如有可能怀孕，请告知医生。检查过程中需要保持头部固定不动，按照技术人员的要求保持正确姿势。整个检查过程通常只需要几分钟。

Reference range

Reference ranges vary by age, sex, and ethnicity; typical adult range 18-24mm; clinical interpretation based on facial skeletal morphology and orthodontic treatment planningN/A

Specimen: serum

Remove all metallic objects and dental appliances before X-ray exposure; maintain natural head position; teeth in centric occlusion; lips at rest

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

这项检查有辐射吗？
是的，头颅X线检查有少量辐射，但剂量很低，约为一次胸片辐射量的三分之一。现代数字化X线设备进一步降低了辐射剂量，对大多数成年人来说是安全的。孕妇和儿童如非必要，应避免进行检查。
检查结果多久能出来？
通常在拍摄后30分钟到几小时内即可获得X线片。医生进行测量和分析通常需要1-2个工作日，具体时间取决于医院的工作流程。
这项检查适合哪些人群？
主要适合需要正畸治疗的患者、颌面外科手术前评估的患者、疑似颌骨发育异常的患者，以及需要评估面部美学的患者。儿童和成人都可以进行这项检查。
测量结果异常怎么办？
测量结果异常提示可能存在颌骨或牙齿位置问题，但这只是诊断的一部分。医生会结合其他检查结果、临床检查和患者需求来制定综合治疗方案。治疗方式可能包括正畸矫正、颌骨手术或两者结合。
  1. 1
    American Association of Orthodontists - Cephalometric X-raysSource
  2. 2
    Radiopaedia - CephalometrySource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

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Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy