Abstract
Aim: Resin modified glass ionomer (RMGI) is class of material that can be used as sealant for preventing and arresting the progression of caries in pits and fissures. As these are hybrid materials, their properties can be affected by factors related to the polymerization process. Therefore, this study aimed to evaluate the influence of different generations of LED curing units (Elipar DeepCure-L and VALO Grand) on Knoop microhardness values (KHN) of RMGI sealants (Clinpro XT and Vitremer). Methods: Forty cylindrical specimens (6mm ø x 1 mm high) were prepared according to the manufacturer’s instructions and divided into four groups (n=10) according to the type of RMGI and LED used. The KHN of the top surface of each sample was calculated 7 days after light-curing. Data were submitted to two-way ANOVA (α = 0.05). Results: Vitremer had higher KHN values than Clinpro XT after using both LEDs (p<0.0001), but especially when light-cured with the use of VALO Grand (p<0.0001). Whereas the KHN value of Clinpro was not influenced by the LED device (p>0.05). Conclusions: Top surface microhardness values of RGMI sealants were affected by both material composition and generations of LED curing units used. Third generation LED curing units seemed to be more efficient for the polymerization of RMGI-based sealants.
Publisher
Universidade Estadual de Campinas
Reference34 articles.
1. Naaman R, El-Housseiny AA, Alamoudi N. the use of pit and fissure sealants-a literature review. Dent J (Basel). 2017;5(4):34. doi: 10.3390/dj5040034.
2. Bani M, Tirali RE. Effect of new light curing units on microleakage and microhardness of resin sealants. Dent Mater J. 2016;35(3):517-22. doi: 10.4012/dmj.2015-357.
3. Borges BCD, Souza-Junior EJ, Catelan A, Ambrosano GM, Paulillo LA, Aguiar FH. Impact of extended radiant exposure time on polymerization depth of fluoride-containing fissure sealer materials. Acta Odontol Latinoam. 2011;24(1):47-51.
4. Seixas G, Guiraldo SB, Lemos LVFM, Myaki SI, Balducci I, Moura S. Clinpro ™ XT Sealant Adhesion to the Occlusal Surface of Primary Molars: Longitudinal Evaluation. J Health Sci. 2018;20(2):112-8. doi: 10.17921/2447-8938.2018v20n2p112-118
5. Wright JT, Crall JJ, Fontana M, Gillette EJ, Nov´y BB, Dhar V, et al. Evidence-based clinical practice guideline for the use of pit-and-fissure sealants: a report of the American Dental Association and the American Academy of Pediatric Dentistry. J Am Dent Assoc. 2016;147(8):672-82.e12. doi: 10.1016/j.adaj.2016.06.001.