Influence of laser irradiation on fiber post retention

Author(s)

Nagase, Denis Y. ^[1] ; de Freitas, Patricia M. ^[2] ; Morimoto, Susana ; Oda, Margareth ; Vieira, Glauco F.

Affiliation

^[1] Univ Sao Paulo, Dept Dentist, Fac Odontol, BR-05508000 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Dept Restorat Dent, Special Lab Lasers Dent, BR-05508000 Sao Paulo - Brazil

• Document type: Journal article
• Source: Lasers in Medical Science; v. 26, n. 3, p. 377-380, MAY 2011.
• Web of Science Citations: 15

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. (AU)

• FAPESP's process: 98/14270-8 - Center for Optical and Photonics Science
• Grantee: Vanderlei Salvador Bagnato
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC