Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of Mechanical Properties of Glass Fiber Posts Subjected to Laser Surface Treatments

Full text
Author(s):
Siqueira, Carolina Barbosa ; de Faria, Natalia Spadini ; Raucci-Neto, Walter ; Colucci, Vivian ; Gomes, Erica Alves
Total Authors: 5
Document type: Journal article
Source: Photomedicine and Laser Surgery; v. 34, n. 10, p. 460-466, OCT 2016.
Web of Science Citations: 1
Abstract

Objective: The aim of this study was to evaluate the influence of laser irradiation on flexural strength, elastic modulus, and surface roughness and morphology of glass fiber posts (GFPs). Background data: Laser treatment of GFPs has been introduced to improve its adhesion properties. Materials and methods: A total of 40 GFPs were divided into 4 groups according to the irradiation protocol: GC-no irradiation, GYAG-irradiation with erbium:yttrium-aluminum-garnet {[}Er:YAG], GCR-irradiation with erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG), and GDI-irradiation with diode laser. The GFP roughness and morphology were evaluated through laser confocal microscopy before and after surface treatment. Three-point bending flexural test measured flexural strength and elastic modulus. Data about elastic modulus and flexural strength were subjected to one-way ANOVA and Bonferroni test (p<0.05). The effect of roughness was evaluated using the linear mixed effects model and Bonferroni test (p<0.05). Results: Laser treatment changed surface roughness in the groups GCR (p=0.000) and GDI (p=0.007). The mean flexural strength in GYAG (995.22MPa) was similar to that in GC (980.48MPa) (p=1.000) but different from that in GCR (746.83MPa) and that in GDI (691.34MPa) (p=0.000). No difference was found between the groups GCR and GDI (p=0.86). For elastic modulus: GYAG (24.47GPa) was similar to GC (25.92GPa) (p=1.000) but different from GCR (19.88GPa) (p=0.002) and GDI (17.20GPa) (p=0.000). Conclusions: The different types of lasers, especially Er,Cr:YSGG and 980m diode, influenced the mechanical properties of GFPs. (AU)

FAPESP's process: 11/12901-7 - In vitro and in situ analysis of dental erosion and prevention methods in patients with gastroesophageal reflux disease
Grantee:Regina Guenka Palma-Dibb
Support Opportunities: Regular Research Grants