Matsuda Risa, Yoneyama Yoshikazu, Morokuma Masakazu, Ohkubo Chikahiro
Department of Removable Prosthodontics, Tsurumi University of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa 230-8501, Japan.
Department of Removable Prosthodontics, Tsurumi University of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa 230-8501, Japan.
J Prosthodont Res. 2014 Apr;58(2):121-6. doi: 10.1016/j.jpor.2014.01.003. Epub 2014 Apr 16.
The present study was conducted to identify how changes in the vertical dimension of occlusion (VDO) affect the sensory perception and activity of the brain in complete denture wearers using an electroencephalogram (EEG).
Subjects were 21 individuals wearing complete dentures who regularly visited the Division of Prosthodontics at Tsurumi University Dental Hospital for checkups (12 males and 9 females, average age: 76.6). Based on their original dentures, two duplicate dentures with different VDO (-3mm and +5mm) were fabricated. EEG activity and occlusal force were measured before and after gum chewing with each denture in all subjects. Negative indicator scores for psychological conditions and stable neuronal activity (Dα) were calculated using EEG data. Statistical analysis was performed using the Wilcoxon test to compare changes in the sensory perception, activity of the brain, and occlusal force (α=0.05).
After gum chewing with the +5-mm denture, a significant increase was observed in the negative indicator score (p<0.05). No significant difference was found in the Dα values before and after gum chewing with any of the dentures (p>0.05). A significant decrease was observed in the occlusal force between the original denture and the -3-mm denture (p<0.05).
Psychological condition and occlusal force were influenced by immediate changes in the VDO of the complete denture.
本研究旨在通过脑电图（EEG）确定咬合垂直距离（VDO）的变化如何影响全口义齿佩戴者的大脑感觉知觉和活动。
研究对象为21名佩戴全口义齿的个体，他们定期前往鹤见大学牙科医院口腔修复科进行检查（12名男性和9名女性，平均年龄：76.6岁）。基于他们原有的义齿，制作了两副具有不同VDO（-3mm和+5mm）的复制义齿。测量了所有受试者佩戴每副义齿咀嚼口香糖前后的EEG活动和咬合力。使用EEG数据计算心理状况的负面指标得分和稳定神经元活动（Dα）。采用Wilcoxon检验进行统计分析，以比较感觉知觉、大脑活动和咬合力的变化（α=0.05）。
佩戴+5mm义齿咀嚼口香糖后，负面指标得分显著增加（p<0.05）。佩戴任何一副义齿咀嚼口香糖前后的Dα值均无显著差异（p>0.05）。原义齿和-3mm义齿之间的咬合力显著降低（p<0.05）。
全口义齿VDO的即时变化会影响心理状况和咬合力。
