Diurnal variation of intraoral pH and temperature,BDJ Open

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Diurnal variation of intraoral pH and temperature
BDJ Open ( IF 2.5 ) Pub Date : 2017-06-30 , DOI: 10.1038/bdjopen.2017.15
Jung Eun Choi ₁ , Karl M Lyons ₁ , Jules A Kieser ₁ , Neil J Waddell ₁

Affiliation

Objective/Aims:

The aim of this study was to measure continuously the intraoral pH and temperature of healthy individuals to investigate their diurnal variations.

Materials and Methods:

Seventeen participants (mean age, 31±9 years) wore a custom-made intraoral appliance fitted with a pH probe and thermocouple for two sets of 24 h, while carrying out normal daily activities including sleep. The continuous changes in intraoral pH and temperature were captured using a sensor placed on the palatal aspect of the upper central incisors. The collected data were categorised into different status (awake and sleep) and periods (morning, afternoon, evening and night). Both quantitative and qualitative analyses were conducted.

Results:

The intraoral pH change was found to show a distinctive daily rhythm, showing a 12-h interval between maximum (7.73) and minimum (6.6) pH values. The maximum and minimum values were found to repeat after 24 h. The mean pH over 48 h (two sets of 24 h) was found to be 7.27 (±0.74). There was significant difference found in pH when subjects were awake and asleep and different periods during the day (P<0.001). The mean intraoral temperature was 33.99 °C (±4.9), with less distinctive daily rhythm compared with pH. There was a significant difference found in temperature depending on the time of the day, except between morning and afternoon (P=0.78).

Conclusion:

Our results showed that there is a distinctive daily, circadian-like pattern in intraoral pH variation over a 24-h period, which has been considered as one of the risk factors in sleep-related dental diseases.

中文翻译：

口内 pH 值和温度的昼夜变化

目标/目的：

本研究的目的是连续测量健康个体的口腔内 pH 值和温度，以研究他们的昼夜变化。

材料和方法：

17 名参与者（平均年龄 31±9 岁）在进行包括睡眠在内的正常日常活动时，佩戴装有 pH 探头和热电偶的定制口内矫治器两组 24 小时。使用放置在上中切牙腭侧的传感器捕获口内 pH 值和温度的连续变化。收集的数据分为不同的状态（清醒和睡眠）和时段（早上、下午、晚上和晚上）。进行了定量和定性分析。

结果：

发现口内 pH 值变化表现出独特的每日节律，在最大 (7.73) 和最小 (6.6) ph 值之间显示 12 小时的间隔。发现最大值和最小值在 24 小时后重复。发现超过 48 小时（两组 24 小时）的平均 pH 值为 7.27（±0.74）。受试者清醒和睡眠以及白天不同时段的pH值存在显着差异（P <0.001）。平均口内温度为 33.99 °C (±4.9)，与 pH 值相比，每日节律不太明显。除上午和下午外，温度在一天中的不同时间存在显着差异（P = 0.78）。