การเปลี่ยนแปลงของอุณหภูมิบนผิวฟันและภายในโพรงเนื้อเยื่อในขณะใช้งานเครื่องสแกนภายในช่องปากและเครื่องฉายแสง: การศึกษานอกกาย

Abstract

Objective: This study investigated pulp chamber changes in temperature during high-intensity illumination from light-curing unit and intraoral scanners in extracted lower first premolars with alternating tooth material thickness. Materials and methods: Twenty extracted lower first premolars were included. The pulp tissue was removed by cutting the root off and pulling it out. Three thermocouple probes of type K were attached to the buccal, lingual surface and inserted in the pulp chamber to measure temperature change during 30 seconds of illumination. The tips of LCU and IOSs were positioned 2.00 mm apart from the buccal surface. The signals received from heat of light sources were amplified and recorded using a digital oscilloscope. The cavity was prepared at the buccal surface with a step of 0.50 mm until achieving a final depth of 2.00 mm The depth of the cavity was measured using a digital caliper. All data were compared statistically with two-way repeated measures ANOVA, multiple comparisons, and Pearson’s correlation. Results: The pulpal probe detected the increasing temperature by approximately 6.59±0.65°C for LCU, 1.58±0.19°C for IOS1 and 1.71±0.19°C for IOS2 when illuminated on the buccal surface. When the remaining dentin thickness was decreased from 2.77±0.44 mm to 0.76±0.44 mm, the probe detected an increasing temperature in the pulp chamber up to 8.42±0.93°C for LCU, which was significantly higher than 2.08±0.21°C and 2.45±0.23°C for IOS1 and IOS2. The increase in pulpal temperature had a positive correlation with the light intensity but a negative correlation with the remaining dentin thickness. Conclusion: The high-intensity light illumination from the light-curing unit and intraoral scanners elevated the temperature in the pulp chamber and potentially caused tooth sensitivity.