Design and calibration of infrared thermography therapeutic device for temporomandibular disorder: An instrument accuracy study

Aim: To design a modification and calibration of the therapy device that is expected to be used in relieving the symptoms of temporomandibular disorders. Materials and Methods: The research type was an experimental study; the method was carried out by designing the addition of some modified components to the therapy device for the calibration of the sensors in terms of measuring the increase and decrease in the temperature repeatedly three times. The temperature increase and decrease time recorded was the duration every 30 min for each session. The data obtained were then processed using the interrater reliability statistical test with interclass correlation coefficient (ICC), to see whether a measuring instrument (device) has adequate and accurate stability. Results: The results of measurements were analyzed using interrater reliability statistical tests with ICC and measuring from the mean value of both the increase and decrease in temperature with the analysis of the Mann–Whitney test Asymp Sig. 2 (tailed) of 0.860, which means it can be assumed to be the same or not different. The result showed that the ICC single measures on the LM35 was 0.894, whereas the ICC single measures on the thermocouple was 0.887. The ICC value of single measures on the LM35 was 0.999, whereas the ICC value for single measures on thermocouples was 0.993. Conclusions: It can be concluded that there was no difference between the value of increased and decreased temperature using the LM35 sensor or thermocouple. It can be assumed that the results are the same and that the ICC value category for the LM35 sensor and the thermocouple is very reliable and has high stability.