Temperature control alternative technique of the glass slab during cement manipulation

Abstract

The null hypothesis tested was that the glass slab temperature control by means of a liquid crystal thermometer attached during cements manipulation was acceptable. For this purpose, the glass slab temperature was verified by placing a liquid crystal thermometer on the lateral surface (LAT) and under the glass slab (CEN). An infrared thermometer (IRT) was used as a gold standard to the temperature measurement at the interval of 18 oC to 24 oC. The value of each measurement in oC was recorded on 15 reference points marked on the glass slab and were repeated three times. The data was submitted to t-test (α = 0.05). The mean temperature recorded was 2.17 oC higher for the LAT and 0.48 oC for the CEN compared to the IRT. The differences showed statistical significance (p < 0.05). The null hypothesis must be accepted, as the liquid crystal thermometer placed below the glass slab provided a more accurate recording of the temperature. It is concluded that the technique is an option to the glass slab with a thermometer attached.