Pulp Temperature Rise Induced by Light-Emitting Diode Light-Curing Units Using an Ex Vivo Model

Materials

Alexandra Vinagre¹  Ana Messias¹  Clara Rebelo¹  João C. Ramos¹  José Francisco Basto²  Rogério Nogueira³  Nélia Alberto³ 

[1] Dentistry Area, Faculty of Medicine, University of Coimbra, Avenida Bissaya Barreto, Blocos de Celas, 3000-075 Coimbra, Portugal;IPMD, Instituto Português de Medicina Dentária, Rua José Luciano Castro, nº 141, Esgueira, 3800-207 Aveiro, Portugal;Instituto de Telecomunicações, Campus Universitário de Santiago, P-3810-193 Aveiro, Portugal;

关键词: dental pulp;    LED light-curing unit;    light curing;    temperature rise;    optical fiber sensors;    fiber Bragg gratings;   

DOI  :  10.3390/ma12030411

来源: DOAJ

【 摘 要 】

The aim of this research was to compare the pulp temperature (PT) rise induced by four light-emitting diode light-curing units (LED LCUs) (Bluephase 20i, Demi Ultra, SPEC 3, and Valo) in different curing modes. Immediately after extraction, the pulp chamber of 11 premolars was accessed from the palatal cervical third of the crown for insertion of fiber Bragg grating (FBG) sensors for temperature measurement and kept in a 37.0° water bath. The teeth were then submitted to a random sequence of curing modes with four irradiations at 30 s intervals. Care was taken to ensure complete pulp temperature reset between curing modes. The curing modes were classified as high-energy (above 80 J/cm²) or low-energy (below 40 J/cm²) according to the total energy density delivered. Statistical analysis was performed with repeated ANOVA measures and Pearson’s correlation for the association between energy density and temperature variation. The significance level was set to 0.05. All curing units promoted a statistically significant PT rise (p < 0.01). After four emissions, the PT rise was higher than 5.0 °C for the high-energy curing modes. The low-energy modes induced approximately a 2.5 °C rise. A strong positive correlation was found between energy density and PT increase (R = 0.715; p = 0.01). Exposure of intact premolars to LED LCUs induced significant and cumulative PT rise. Curing modes emitting high energy densities produced higher PT variations. Radiant exposure was positively correlated to PT variation.

【 授权许可】

Unknown