Effect of high-powered LED and dentin thickness on intrapulpal temperature rise in primary teeth

Obada Bassam Jabbour


Temperature rise in the pulp chamber is a severe stress that can cause irreversible damage to the pulp. The objective of this study was to compare the temperature rise under primary teeth dentin induced by Light Emitting Diode (LED1) with different light curing modes. Thirty dentin discs of 0.5- and 2-mm thickness were prepared from human primary molars. Resin composite placed in an acrylic cavity was cured using a high-powered LED (Foshan JERRY Medical Apparatus CO., LTD, Foshan, China) for 20s. The different modes tested in this study were standard mode, ramp mode, and pulse mode (n=5). Temperature was recorded using a k-type thermocouple in direct contact with the dentin disc. Temperature change data were subjected to analysis of variance (ANOVA) and Tukey's test. The highest temperature rise was observed under 0.5 mm thick dentin disc with standard mode (4.7 ± 0.42), whereas the lowest values were recorded with pulse mode under 2 mm thick dentin (2.5 ± 0.23). Pulse mode produced significant lower temperature rise compared to standard mode in both dentin thicknesses (P < 0.05). Ramp mode gave significantly lower values compared to standard mode in 0.5 mm group (P < 0.05). For standard and ramp modes, temperature rise decreased with the increase of the dentin thickness (P < 0.05). Maximum temperature rise induced by high-powered LED was not critical for pulpal health. Temperature rise related to dentin thickness and curing modes. Pulse mode gave the lowest values.


Dentistry; Pediatrics

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