Influence of laser irradiation on fiber post retention |
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Authors: | Denis Y. Nagase Patricia M. de Freitas Susana Morimoto Margareth Oda Glauco F. Vieira |
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Affiliation: | 1.Department of Restorative Dentistry,University of S?o Paulo,S?o Paulo,Brazil;2.Special Laboratory of Lasers in Dentistry, Department of Restorative Dentistry,University of S?o Paulo,S?o Paulo,Brazil;3.Departamento de Dentistica,Faculdade de Odontologia – USP,Sao Paulo,Brazil |
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Abstract: | The purpose of this in vitro study was to compare the bond strength between fiber post and laser-treated root canals. Forty single-rooted bovine teeth were endodontically treated and randomly divided into four groups of equal size according to the root canal treatment: group 1 conventional treatment (without laser irradiation); group 2 Nd:YAG laser (1.5 W, 10 Hz, 100 mJ); group 3 Er,Cr:YSGG laser (0.75 W, 20 Hz); and group 4 Nd:YAG + Er,Cr:YSGG lasers. The fiber posts were cemented with an adhesive system + resin cement, in accordance with the manufacturer’s instructions. A mini acrylic pipe was fixed on the coronal section of the post using a light-polymerized resin. Specimens were mounted on an acrylic pipe with a self-polymerized resin. Retention forces were determined using a universal testing machine (0.5 mm/min). Data were analyzed using one-way ANOVA and Tukey tests (p <0.05). The post retention force in group 2 was found to be lower than that in the other experimental groups. Fractures were observed at the interface between the dentin and the resin in all groups. High-intensity lasers can be used in conventional endodontic treatment; however, root canal surface irradiation using the Nd:YAG laser was shown to negatively affect the post retention force. |
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