J Prosthodont. 2023 Mar 14. doi: 10.1111/jopr.13672. Online ahead of print.
PURPOSE: To assess the changes in intrapulpal temperature between electric high-speed handpieces of different coolant functions (‘Water Jet’ and ‘Water Spray’), coolant port designs (1- and 4-port), suction use and bur and tooth types using an experimental in vitro set-up.
MATERIALS AND METHODS: Forty-four extracted anterior and posterior teeth were collected. A total of 18 groove cuts (n = 18/coolant port spray design, bur and tooth type group) and 12 groove cuts (n = 12/ tooth type and suction use) was completed, with a total of 264 groove cuts. Real-time temperature and duration was recorded at 1 s intervals throughout the preparation process using a thermocouple and digital data logger set-up (GFX Data Logger Series and EL USB-TC; Lascar Electronics Inc, USA), and the data retrieved using EasyLog Software (EasyLog USB; Lascar Electronics Inc, USA). Statistical analysis was performed (SPSS V.27) for the change in temperature using the ANOVA and post-hoc analysis.
RESULTS: The majority of the specimen cuts, regardless of tooth (anterior or posterior) and bur (diamond or carbide) type, handpiece coolant port design and suction use showed an overall decreasing trend in intrapulpal temperature. No cuts caused a mean temperature change that reached the critical temperature of 42.5°C, or resulted in an overall increase in intrapulpal temperature when the 60 s duration was completed.
CONCLUSIONS: The tested electric handpieces efficiently reduced intrapulpal temperature, with the majority displaying a decreasing trend. A greater decrease in intrapulpal temperature was observed in canines compared to premolars; carbide burs compared to diamond; and with no suction preparations compared to when suction was used. This article is protected by copyright. All rights reserved.