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

Autor(es)

Siqueira, Carolina Barbosa ; de Faria, Natalia Spadini ; Raucci-Neto, Walter ; Colucci, Vivian ; Gomes, Erica Alves

• Tipo de documento: Artigo Científico
• Fonte: Photomedicine and Laser Surgery; v. 34, n. 10, p. 460-466, OCT 2016.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 11/12901-7 - Análise in vitro e in situ da erosão dental e de métodos de prevenção em pacientes portadores da doença do refluxo gastroesofágico
• Beneficiário: Regina Guenka Palma-Dibb
• Modalidade de apoio: Auxílio à Pesquisa - Regular