The influence of occlusal overload on the threshold of tooth pain.

咬合超载对牙痛阈值的影响。

• 批准号: 62570879
• 负责人: KUBO Yoshihiro
• 金额: $ 1.34万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62570879/
• 关键词: occlusal overload; tooth sensation; tooth electrical stimulation; periodontal pulsation; 歯周脈波

The hypersensitivity of a vital tooth caused by occlusal overload is found in dental practice, but this mechanism is an open question. In this research the influence of occlusal overload on tooth pulp as well as periodontal tissue was studied. A high inlay was placed in a tooth of a volunteer and the additional height was measured with IP-Checker. The threshold of tooth pain induced by electrical stimulation, the value of vertical tooth migration and the amplitude of periodontal pulsation were measured. The condition of occlusal contacts in a dental arch was recorded with an articulating paper before and agter the placement of a high inlay. The results are as follows:1. 21 teeth studied, 16 decreased in the threshold of tooth pain, three increased and two did not show the characteristic change. 2. The decrease in the threshold of tooth pain might be due to reversible inflammation of the pulpal tissue, while the increase might be due to repetitive slight decrease of the pulpal blood stream or to pressure on the pulpal nerve at the apex of periodontal tissue. 3. The threshold changes of tooth pain had a significant relationship to the state of the vertical tooth migration and the amplitude of periodontal pulsation. 4. a high inlay sometimes induced the change in occlusal contacts throughout the dental arch even after the proper occlusal adjustment was done.

咬合超负荷引起的活体牙齿过敏在牙科实践中已有发现，但其发生机制尚无定论。本研究探讨了咬合超负荷对牙髓和牙周组织的影响。在志愿者的牙齿中放置一个高嵌体，用IP-Checker测量额外的高度。测定电刺激引起的牙痛阈值、牙齿垂直移动值和牙周搏动幅度。在放置高嵌体之前和之后，用关节纸记录牙弓中咬合接触的情况。研究结果如下：1.研究的21颗牙齿中，16颗牙齿痛觉阈值降低，3颗牙齿痛觉阈值升高，2颗牙齿痛觉阈值无明显变化。2.牙痛阈值的降低可能与牙髓组织的可逆性炎症有关，而牙髓血流的反复轻微减少或牙周组织尖端的牙髓神经受压可能是牙痛阈值升高的原因。3.牙痛阈值变化与牙齿垂直移动状态和牙周搏动幅度有显著关系。4.高嵌体有时会引起整个牙弓咬合接触的变化，即使在进行适当的咬合调整之后也是如此。