Effect of Erbium-Doped Yttrium Aluminium Garnet Laser Parameters on Ablation Capacity and Morphology of Primary Dentin

Ortolan, Andréa Soares de Oliveira; Torres, Carolina Paes; Gomes-Silva, Jaciara Miranda; Oliveira, Maria Angélica Hueb de Menezes; Pécora, Jesus Djalma; Palma-Dibb, Regina Guenka; Borsatto, Maria Cristina

doi:10.1089/pho.2008.2358

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Concerning the SEM micromorphological analysis, the Er:YAG laser irradiation in sound dentin promoted irregular surfaces with microcracks and a high removal of the intertubular dentin, leaving the peritubular dentin with tubular protrusion aspect. This pattern is usually described in literature and can be explained by the fact that peritubular dentin has a high mineral content and lacks collagen as an organic matrix, which is a structure different from that of intertubular dentin, which is 92% collagen (Armengol et al, 1999; Corona et al, 2007; De Oliveira Ortolan et al, 2009; Kuboki et al, 1977; Raucci‐Neto et al, 2008). However, the SEM analysis of carious dentin irradiated with the same frequency levels revealed a flat surface without microcracks and similar ablation of both intertubular and peritubular dentin.…”

Section: Discussionmentioning

confidence: 80%

Interferon regulatory factor-3 activation, hepatic interferon-stimulated gene expression, and immune cell infiltration in hepatitis C virus patients

et al. 2008

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Interferon regulatory factor-3 (IRF-3) activation directs ␣/␤ interferon production and interferon-stimulated gene (ISG) expression, which limits virus infection. Here, we examined the distribution of hepatitis C virus (HCV) nonstructural 3 protein, the status of IRF-3 activation, and expression of IRF-3 target genes and ISGs during asynchronous HCV infection in vitro and in liver biopsies from patients with chronic HCV infection, using confocal microscopy and functional genomics approaches. In general, asynchronous infection with HCV stimulated a low-frequency and transient IRF-3 activation within responsive cells in vitro that was associated with cell-to-cell virus spread. Similarly, a subset of HCV patients exhibited the nuclear, active form of IRF-3 in hepatocytes and an associated increase in IRF-3 target gene expression in hepatic tissue. Moreover, ISG expression profiles formed disease-specific clusters for HCV and control nonalcoholic fatty liver disease patients, with increased ISG expression among the HCV patients. We identified the presence of T cell and plasmacytoid dendritic cell infiltrates within all biopsy specimens, suggesting they could be a source of hepatic interferon in the setting of hepatitis C and chronic inflammatory condition. Conclusion: These results indicate that HCV can transiently trigger IRF-3 activation during virus spread and that in chronic HCV, IRF-3 activation within infected hepatocytes occurs but is limited. (HEPATOLOGY 2008;47:799-809.)

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Section: Discussionmentioning

confidence: 80%

Interferon regulatory factor-3 activation, hepatic interferon-stimulated gene expression, and immune cell infiltration in hepatitis C virus patients

et al. 2008

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“…29,31 Different energy levels of the Er:YAG laser have been used by investigators. [44][45][46] In this study, we preferred to use lower powers of the Er:YAG laser because the use of higher laser powers (400 and 600 mJ) would cause excessive destruction of material. 47 The CO2 laser is also used in dentistry.…”

Section: Discussionmentioning

confidence: 99%

Effect of Surface Treatment With Er:YAG and CO2 Lasers on Shear Bond Strength of Polyether Ether Ketone to Composite Resin Veneers

2020

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Introduction: Polyether ether ketone (PEEK) has low surface energy and high resistance to chemical surface treatments. Therefore, different surface treatments such as laser conditioning should be investigated. There is a gap of information regarding the efficacy of laser irradiation in the surface treatment of PEEK, and the efficacy of several laser types needs to be evaluated for this purpose. This study aimed to assess the effect of surface treatment with erbium-doped yttrium aluminum garnet (Er:YAG) and carbon dioxide (CO2) lasers on shear bond strength (SBS) of PEEK to composite resin veneers. Methods: In this experimental study, 60 rectangular-shaped PEEK samples (7 x 7 x 2 mm) were used. The samples were mounted in auto-polymerizing acrylic resin in such a way that only one surface measuring 7x7 mm remained exposed. The samples were then randomly divided into 3 groups (n=20) of control, Er:YAG laser surface treatment (Power=1.5 W, energy density=119.42 J/cm2 , irradiation time=20 s) and CO2 laser surface treatment (Power=4 W, energy density=159.22 J/cm2 , irradiation time=50 s). The bonding agent and PEEK opaque were applied on the surface of samples and they were veneered with a composite resin using a hollow plastic cylinder with an internal diameter of 4 mm. The SBS was then measured and the data were analyzed using one-way ANOVA, Tukey HSD test and Dunnett’s test at 0.05 level of significance. Results: The SBS of the 3 groups was significantly different (P<0.001). The Tukey HSD test revealed that the Er:YAG laser had higher SBS than the CO2 laser group (P<0.001). The Dunnett’s test showed that both Er:YAG and CO2 laser groups yielded higher SBS than the control group (P<0.001). Conclusion: The Er:YAG and CO2 laser treatments can increase the SBS of PEEK to composite resin veneers, although the Er:YAG laser seems to be more effective for this purpose.

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“…In regard to Er: YAG laser irradiation, no previous studies have reported parameters for deciduous dentin conditioning. In this study, two different energy densities were employed, the irradiation parameters were chosen according to the results of a pilot study carried out in our laboratory and designed previous literature review, only ablation parameters for deciduous teeth were found (De Oliveira Ortolan et al, ; Flury et al, ; Kornblit et al, , Monghini et al, ; Zhang et al, ). Additionally, water irrigation was used as a cooling agent to limit the temperature rise in dental tissue (Visuri et al, ).…”

Section: Discussionmentioning

confidence: 99%

Morphological and chemical changes in human deciduous dentin after phosphoric acid, self‐etching adhesive and Er: YAG laser conditioning

Moyaho-Bernal

Contreras‐Bulnes

Rodríguez‐Vilchis

et al. 2018

Microscopy Res & Technique

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The morphological and chemical changes in deciduous dentin produced by different conditioning protocols were evaluated in this in vitro study. Eighty primary dentin samples were divided into eight groups (n = 10): G1, acid etching; G2, self-etching adhesive; G3, G4, Er: YAG laser irradiation at 25.5 and 38.2 J cm , respectively; 10 Hz and spray irrigation. Groups 5, 6, 7, and 8 were irradiated at previous densities, and then phosphoric acid or self-etching adhesive conditioning was applied. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to evaluate chemical and morphological changes. Paired t-test and One-way ANOVA were used for statistical analysis (p ≤ 0.05). All samples showed different morphology with specific characteristics according to the conditioning protocol. Changing element concentration values are expressed in atomic percent (at %). After conditioning, there were statistically significant differences (p ≤ 0.05) for p at% and Ca/P in all groups; highlighting the following additional findings by group: G1, G7, and G8 showed changes in all elements studied, G2 presented a decrease in C at% and increased Ca at%, G3 and G4 exhibited at% changes in C, trace elements and Ca. Furthermore, G5 showed at% changes in O and trace elements; while G6 changes were observed on C at%, O at% and trace elements at%. Dentin morphology and chemical composition varied in accordance with the conditioning protocol, with characteristics specific for each one that could have clinical implications for the retention and bond strength performance of adhesive materials.

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Effect of Erbium-Doped Yttrium Aluminium Garnet Laser Parameters on Ablation Capacity and Morphology of Primary Dentin

Abstract: The settings of 160, 200, and 250 mJ at 2 and 3 Hz promoted a good ablation rate with fewer surface alterations in primary dentin.

Cited by 10 publications

References 26 publications

Interferon regulatory factor-3 activation, hepatic interferon-stimulated gene expression, and immune cell infiltration in hepatitis C virus patients

Interferon regulatory factor-3 activation, hepatic interferon-stimulated gene expression, and immune cell infiltration in hepatitis C virus patients

Effect of Surface Treatment With Er:YAG and CO2 Lasers on Shear Bond Strength of Polyether Ether Ketone to Composite Resin Veneers

Morphological and chemical changes in human deciduous dentin after phosphoric acid, self‐etching adhesive and Er: YAG laser conditioning

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