Chunhacheevachaloke E, Ajcharanukul O
Department of Pediatric and Preventive Dentistry, Srinakharinwirot University, Bangkok, Thailand.
Department of Stomatology, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand.
Int Endod J. 2016 Mar;49(3):237-44. doi: 10.1111/iej.12446. Epub 2015 Mar 24.
(1) To determine the pulpal sensory thresholds in human teeth obtained from using various EPT conducting media and (2) to determine whether there are gender differences.
One intact maxillary central incisor was randomly selected from each of 40 participants (20 male, 20 female) aged 19-24 year. A constant-current electrical stimulator (University of Bristol, UK) was used to apply electrical stimuli with different conducting media at intervals of 1 min on the middle of the crown to evaluate the sensory threshold of the tooth. The tip of the electrode was coated with a thin layer of test media. The sensory thresholds and the pain scores were measured simultaneously after applying stimuli twice a second and gradually increasing the intensity until felt by the participants. Test media included water-based gels (K-Y UltraGel; Xylocaine 2% Jelly, electrode gel, fluoride gel) and toothpastes (Colgate Total; Sensodyne Repair & Protect; Dentiste' Plus White; Sparkle White). The sensory threshold data were evaluated using two-way anova followed by the Tukey test.
Xylocaine 2% Jelly and fluoride gel evoked significantly lower threshold values when compared with Sensodyne Repair & Protect (P < 0.001). With all test media, the mean sensory threshold from the female group was significantly lower than that of the male group (P < 0.001).
The sensory thresholds to electrical stimuli in human teeth was influenced by the type of conducting media and gender.
（1）确定使用各种牙髓电活力测试（EPT）导电介质时人牙的牙髓感觉阈值；（2）确定是否存在性别差异。
从40名年龄在19至24岁的参与者（20名男性，20名女性）中随机选取一颗完整的上颌中切牙。使用恒流电刺激器（英国布里斯托大学），在牙冠中部每隔1分钟用不同的导电介质施加电刺激，以评估牙齿的感觉阈值。电极尖端涂有一层薄薄的测试介质。以每秒两次的频率施加刺激并逐渐增加强度直至参与者感觉到，同时测量感觉阈值和疼痛评分。测试介质包括水基凝胶（K-Y超凝胶；2%利多卡因凝胶、电极凝胶、氟化物凝胶）和牙膏（高露洁全效；舒适达修复与保护；登士柏加美白；闪亮美白）。使用双向方差分析和Tukey检验对感觉阈值数据进行评估。
与舒适达修复与保护相比时，2%利多卡因凝胶和氟化物凝胶诱发的阈值显著更低（P < 0.001）。对于所有测试介质，女性组的平均感觉阈值显著低于男性组（P < 0.001）。
人牙对电刺激的感觉阈值受导电介质类型和性别的影响。
