What is the trigger of hyperalgesia in painful tooth clenching habit?

2015 Fiscal Year Final Research Report

• Project/Area Number: 25463006
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Prosthodontics/ Dental materials science and
• Research Institution: Nagasaki University
• Principal Investigator: TORISU Tetsurou 長崎大学, 病院(歯学系), 講師 (80264258)
• Co-Investigator(Kenkyū-buntansha): MURATA Hiroshi 長崎大学, 医歯薬学総合研究科(歯学系), 教授 (40229993) ; TANAKA Mihoko 長崎大学, 医歯薬学総合研究科(歯学系), 助教 (00304957)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 口腔顔面痛 / 疼痛過敏 / 慢性疼痛 / eccentric運動 / 顎運動 / 低強度かみしめ / 頚部筋活動 / 三叉神経

Outline of Final Research Achievements

Etiology of hyperalgesia in chronic orofacial pain patients, especially the possible contribution of jaw movements to hyperalgesia, was investigated. Single experimental low-level jaw clenching did not induce orofacial hyperalgesia, but inhibited pain sensitivity evaluated by temporal summation. Prior-load of eccentric jaw exercise increased pain sensitivity after the　subsequent low-level jaw clenching, and different levels in prior eccentric exercise evoked different condition of pain sensitivity. These findings may suggest that prior-load of eccentric jaw exercise can evoke hyperalgesic condition in orofacial region. Character of image analysis of food particles as a method of evaluation for stomatognathic function, and sensory-motor interactions between the intra-oral sensory system and neck muscle activity, were also investigated.

Free Research Field

補綴系歯学・顎口腔機能