The study on the bite pain caused by the endodontic treatment.

牙髓治疗引起的咬痛的研究。

• 批准号: 10671809
• 负责人: NAKASHIMA Masato
• 金额: $ 1.66万
• 依托单位: Asahi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10671809/
• 关键词: Bite pain; perforation of root canal; periodontal membrane; Jaw opening reflex; Periodontal sensation; 歯の穿孔; 歯根膜の方向特異性; ラット; 穿孔; 打診; 板状根

The purpose of this study was to investigate the mechanism of bite pain caused by the endodontic treatment. In 24 out of 36 patients complained of the bite pain after the endodontic treatment, the perforation in the apex or the middle of root canal was observed on X ray films and the clinical examinations. Therefore, the animal experiments were carried out to clarify the relationship between the perforation of root canal and bite pain. The threshold of rat jaw opening reflex (JOR) elicited by mechanical stimulation to upper right (control group) and left incisor (perforation group) was investigated in this experiment. As a result, the threshold of JOR elicited by mechanical stimulation to labiopalatal direction in perforation group was lower than that of palatolabial direction. Moreover, when the tooth that has a perforation in the apex or the middle of root canal was pressed from the specific direction, especially the opposite direction to the perforation area, the patient complained of the sensation like dull pain. This sensation might be elicited by the stretch of the periodontal membrane near the perforation.These findings suggested that the bite pain after the endodontic treatment might be related to the perforation in root canal, and that the region of perforation might be able to speculate by pressing the tooth from the different direction.

本研究的目的是探讨根管治疗引起咬合疼痛的机制。36例根管治疗后出现咬合疼痛的患者中，有24例在X线片和临床检查中发现根管顶部或中部穿孔。因此，本研究通过动物实验，探讨根管穿孔与咬合痛的关系。本实验研究了机械刺激大鼠右上切牙（对照组）和左切牙（穿孔组）引起的下颌张开反射（JOR）阈值。结果表明，穿孔组唇腭方向机械刺激诱发的JOR阈值低于腭唇方向。此外，当从特定方向，特别是与穿孔区域相反的方向按压在根尖或根管中部有穿孔的牙齿时，患者抱怨类似钝痛的感觉。提示根管治疗后的咬痛可能与根管穿孔有关，从不同方向按压牙齿可以推测穿孔的部位。