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Carlos Paula Eduardo - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Er:YAG and Er,Cr:YSGG laser irradiation on the adhesion to eroded dentin
    Lasers in Medical Science, 2015
    Co-Authors: Thaysa Monteiro Ramos, Norbert Gutknecht, Thayanne Monteiro Ramos-oliveira, Patricia Moreira Freitas, Nilton Azambuja, Marcella Esteves-oliveira, Carlos Paula Eduardo
    Abstract:

    Limited information is available regarding the adhesion to eroded dentin. This study aims to evaluate the effect of different surface treatments on eroded dentin morphology and on microtensile bond strength (μTBS) of adhesive systems to this substrate. Ninety-six extracted third molars were randomly divided into eight groups ( n  = 12) according to the type of surface treatment and the adhesive system: G1 = Control + Clearfil SE Bond [SE], G2 = Diamond bur [DB] + SE, G3 = Er:YAG laser (60 mJ, 2 Hz, 0.12 W, 19.3 J/ cm^2) + SE, G4 = Er,Cr:YSGG laser (50 mJ, 30 Hz, 1.5 W, 4.5 J/ cm^2) + SE, G5 = Control + Single Bond [SB], G6 = DB + SB, G7 = Er:YAG + SB, G8 = Er,Cr:YSGG + SB. The erosive cycling was performed by immersion in 0.05 M citric acid (pH 2.3, 10 min, 6x/day) and in supersaturated solution (pH 7.0, 1 h, between acid attacks), during 5 days. Blocks of composite were bonded to the samples according to the manufacturers' instructions. After 24 h-storage in distilled/deionized water (37 °C), stick-shaped samples were obtained and submitted to μTBS test. Each surface treatment was analyzed under scanning electron microscopy ( n  = 4) and the bond strength values (megapascal) were analyzed by two-way ANOVA and Tukey tests ( α  = 0.05). All surface treatments lead to changes on eroded dentin. G4 showed the highest bond strength mean (28.3 ± 9.2 MPa), which was statistically significant higher than all the other groups ( p  

  • Comparative analysis of root surface smear layer removal by different etching modalities or erbium:yttrium–aluminum–garnet laser irradiation. A scanning electron microscopy study
    Lasers in Medical Science, 2010
    Co-Authors: Letícia Helena Theodoro, Denise Maria Zezell, Valdir Gouveia Garcia, Patrícia Haypek, Maria José Hitomi Nagata, Juliano Milanezi Almeida, Carlos Paula Eduardo
    Abstract:

    The purpose of this study was to evaluate the effect of erbium:yttrium–aluminum–garnet (Er:YAG) laser (2.94 μm) irradiation on the removal of root surface smear layer of extracted human teeth and to compare its efficacy with that of citric acid, ethylenediamine tetra-acetic acid (EDTA), or a gel containing a mixture of tetracycline hydrochloride (HCl) and citric acid, using scanning electron microscopy (SEM). Thirty human dentin specimens were randomly divided into six groups: G1 (control group), irrigated with 10 ml of physiologic saline solution; G2, conditioned with 24% citric acid gel; G3, conditioned with 24% EDTA gel; G4, conditioned with a 50% citric acid and tetracycline gel; G5, irradiated with Er:YAG laser (47 mJ/10 Hz/5.8 J/cm^2/pulse); G6, irradiated with Er:YAG laser (83 mJ/10 Hz/10.3 J/cm^2/pulse). Electron micrographs were obtained and analyzed according to a rating system. Statistical analysis was conducted with Kruskal–Wallis and Mann–Whitney tests ( P  

Norbert Gutknecht - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Er:YAG and Er,Cr:YSGG laser irradiation on the adhesion to eroded dentin
    Lasers in Medical Science, 2015
    Co-Authors: Thaysa Monteiro Ramos, Norbert Gutknecht, Thayanne Monteiro Ramos-oliveira, Patricia Moreira Freitas, Nilton Azambuja, Marcella Esteves-oliveira, Carlos Paula Eduardo
    Abstract:

    Limited information is available regarding the adhesion to eroded dentin. This study aims to evaluate the effect of different surface treatments on eroded dentin morphology and on microtensile bond strength (μTBS) of adhesive systems to this substrate. Ninety-six extracted third molars were randomly divided into eight groups ( n  = 12) according to the type of surface treatment and the adhesive system: G1 = Control + Clearfil SE Bond [SE], G2 = Diamond bur [DB] + SE, G3 = Er:YAG laser (60 mJ, 2 Hz, 0.12 W, 19.3 J/ cm^2) + SE, G4 = Er,Cr:YSGG laser (50 mJ, 30 Hz, 1.5 W, 4.5 J/ cm^2) + SE, G5 = Control + Single Bond [SB], G6 = DB + SB, G7 = Er:YAG + SB, G8 = Er,Cr:YSGG + SB. The erosive cycling was performed by immersion in 0.05 M citric acid (pH 2.3, 10 min, 6x/day) and in supersaturated solution (pH 7.0, 1 h, between acid attacks), during 5 days. Blocks of composite were bonded to the samples according to the manufacturers' instructions. After 24 h-storage in distilled/deionized water (37 °C), stick-shaped samples were obtained and submitted to μTBS test. Each surface treatment was analyzed under scanning electron microscopy ( n  = 4) and the bond strength values (megapascal) were analyzed by two-way ANOVA and Tukey tests ( α  = 0.05). All surface treatments lead to changes on eroded dentin. G4 showed the highest bond strength mean (28.3 ± 9.2 MPa), which was statistically significant higher than all the other groups ( p  

  • Influence of etching with erbium, chromium:yttrium–scandium–gallium–garnet laser on microleakage of class V restoration
    Lasers in Medical Science, 2010
    Co-Authors: Juliana Marotti, Vinícius Rangel Geraldo-martins, Marina Stella Bello-silva, Carlos Eduardo, Christian Apel, Norbert Gutknecht
    Abstract:

    The aim of this in vitro study was to evaluate some parameters of dental etching when irradiated with an erbium, chromium:yttrium–scandium–gallium–garnet (Er,Cr:YSGG) laser. One-hundred sound human third molars were selected and randomly distributed into ten groups ( n  = 10). The class V cavities of group 1 (control) were prepared with a bur and etched with 37% phosphoric acid, while groups G2 to G10, were prepared with laser (5 W, 88.46 J/cm^2, 90/70% air/water) and etched with the following powers: G3 and G4, 0.25 W; G5 and G6, 0.5 W; G7 and G8, 0.75 W; G9 and G10, 1 W. Group G2 received no laser etching. Prior to restoration, G2, G4, G6, G8 and G10 received acid etching. After restoration, all samples were submitted to a microleakage test. According to statistical analysis (Kruskal–Wallis and Dunn’s tests), G10 presented the lowest microleakage values ( P

Hiroshi Anai - One of the best experts on this subject based on the ideXlab platform.

  • effects of blood flow and or ventilation restriction on radiofrequency coagulation size in the lung an experimental study in swine
    CardioVascular and Interventional Radiology, 2006
    Co-Authors: Hiroshi Anai, Barry T Uchida, Dusan Pavcnik, Chang Kyu Seong, Phillip Baker, Luiz O Correa, Christopher L Corless, Serdar Geyik, Kivilcim Yavuz
    Abstract:

    The purpose of this study was to investigate how the restriction of blood flow and/or ventilation affects the radiofrequency (RF) ablation coagulation size in lung parenchyma. Thirty-one RF ablations were done in 16 normal lungs of 8 living swine with 2-cm LeVeen needles. Eight RF ablations were performed as a control (group G1), eight with balloon occlusion of the ipsilateral mainstem bronchus (G2), eight with occlusion of the ipsilateral pulmonary artery (G3), and seven with occlusion of both the ipsilateral bronchus and pulmonary artery (G4). Coagulation diameters and volumes of each ablation zone were compared on computed tomography (CT) and gross specimen examinations. Twenty-six coagulation zones were suitable for evaluation: eight in G1, five in G2, seven in G3, and six in G4 groups. In G1, the mean coagulation diameter was 21.5 +/- 3.5 mm on CT and 19.5 +/- 1.78 mm on gross specimen examination. In G2, the mean diameters were 26.5 +/- 5.1 mm and 23.0 +/- 2.7 mm on CT and gross specimen examination, respectively. In G3, the mean diameters were 29.4 +/- 2.2 mm and 27.4 +/- 2.9 mm on CT and gross specimen examination, respectively, and in G4, they were 32.6 +/- 3.33 mm and 28.8 +/- 2.6 mm, respectively. The mean coagulation volumes were 3.39 +/- l.52 cm(3) on CT and 3.01 +/- 0.94 cm(3) on gross examinations in G1, 6.56 +/- 2.47 cm(3) and 5.22 +/- 0.85 cm(3) in G2, 10.93 +/- 2.17 cm(3) and 9.97 +/- 2.91 cm(3) in G3, and 13.81 +/- 3.03 cm(3) and 11.06 +/- 3.27 cm(3) in G4, respectively. The mean coagulation diameters on gross examination and mean coagulation volumes on CT and gross examination with G3 and G4 were significantly larger than those in G1 (p < 0.0001, p < 0.0001, p < 0.0001, respectively) or in G2 (p < 0.05, p < 0.005, p < 0.005, respectively). Pulmonary collapse occurred in one lung in G2 and pulmonary artery thrombus in two lungs of G3 and two lungs of G4. The coagulation size of RF ablation of the lung parenchyma is increased by ventilation and particularly by pulmonary artery blood flow restriction. The value of these restrictions for potential clinical use needs to be explored in experimentally induced lung tumors.

  • Effects of Blood Flow and/or Ventilation Restriction on Radiofrequency Coagulation Size in the Lung: An Experimental Study in Swine
    CardioVascular and Interventional Radiology, 2006
    Co-Authors: Hiroshi Anai, Barry T Uchida, Dusan Pavcnik, Chang Kyu Seong, Phillip Baker, Luiz O Correa, Christopher L Corless, Serdar Geyik, Kivilcim Yavuz, Hiroshi Sakaguchi
    Abstract:

    The purpose of this study was to investigate how the restriction of blood flow and/or ventilation affects the radiofrequency (RF) ablation coagulation size in lung parenchyma. Thirty-one RF ablations were done in 16 normal lungs of 8 living swine with 2-cm LeVeen needles. Eight RF ablations were performed as a control (group G1), eight with balloon occlusion of the ipsilateral mainstem bronchus (G2), eight with occlusion of the ipsilateral pulmonary artery (G3), and seven with occlusion of both the ipsilateral bronchus and pulmonary artery (G4). Coagulation diameters and volumes of each ablation zone were compared on computed tomography (CT) and gross specimen examinations. Twenty-six coagulation zones were suitable for evaluation: eight in G1, five in G2, seven in G3, and six in G4 groups. In G1, the mean coagulation diameter was 21.5 ± 3.5 mm on CT and 19.5 ± 1.78 mm on gross specimen examination. In G2, the mean diameters were 26.5 ± 5.1 mm and 23.0 ± 2.7 mm on CT and gross specimen examination, respectively. In G3, the mean diameters were 29.4 ± 2.2 mm and 27.4 ± 2.9 mm on CT and gross specimen examination, respectively, and in G4, they were 32.6 ± 3.33 mm and 28.8 ± 2.6 mm, respectively. The mean coagulation volumes were 3.39 ± l.52 cm^3 on CT and 3.01 ± 0.94 cm^3 on gross examinations in G1, 6.56 ± 2.47 cm^3 and 5.22 ± 0.85 cm^3 in G2, 10.93 ± 2.17 cm^3 and 9.97 ± 2.91 cm^3 in G3, and 13.81 ± 3.03 cm^3 and 11.06 ± 3.27 cm^3 in G4, respectively. The mean coagulation diameters on gross examination and mean coagulation volumes on CT and gross examination with G3 and G4 were significantly larger than those in G1 ( p < 0.0001, p < 0.0001, p < 0.0001, respectively) or in G2 ( p < 0.05, p < 0.005, p < 0.005, respectively). Pulmonary collapse occurred in one lung in G2 and pulmonary artery thrombus in two lungs of G3 and two lungs of G4. The coagulation size of RF ablation of the lung parenchyma is increased by ventilation and particularly by pulmonary artery blood flow restriction. The value of these restrictions for potential clinical use needs to be explored in experimentally induced lung tumors.

Cesar Penazzo Lepri - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Er,Cr:YSGG laser, associated or not to desensitizing agents, in the prevention of acid erosion in bovine root dentin
    Lasers in Medical Science, 2019
    Co-Authors: Brenda Ferreira Arantes, Vinícius Rangel Geraldo-martins, Laura Oliveira Mendonça, Regina Guenka Palma-dibb, Juliana Jendiroba Faraoni, Denise Tornavoi De Castro, Cesar Penazzo Lepri
    Abstract:

    This in vitro study evaluated the influence of the Er,Cr:YSGG laser, associated or not to desensitizing agents, in the prevention of acid erosion in bovine root dentin. Eighty dentin specimens were selected and divided into eight groups ( n  = 10): G1: negative control; G2: positive control (5% fluoride varnish-FV); G3: Er,Cr:YSGG laser; G4: FV + laser; G5: 3% potassium oxalate; G6: 3% potassium oxalate + laser; G7: biphasic calcium silicate/phosphate gel (gel); G8: gel + laser. Laser parameters: 0.5 W, 6.25 J/cm^2 at 1-mm distance. The erosive drink used was a cola soft-drink (pH = 2.42 at 4 °C), lasting 5 min, twice a day, with 6-h intervals between the challenges, during 14 days. Kolmogorov-Smirnov and Levene’s tests were satisfied. The surface roughness data were submitted to ANOVA and Tukey post hoc tests. For the wear profile, Kruskal-Wallis and Dunn post hoc tests were used. Afterwards, the Spearman correlation test was performed. All statistical tests assumed a significance level of 5% ( α  = 0.05). G1 presented the highest surface roughness value after the erosive challenge (3.586 μm^2 ± 0.205 μm^2) and the G7 presented the lowest surface roughness value after the erosive challenge (1.071 μm^2 ± 0.180 μm^2). For the lost volume, G4 presented the lowest percentage (9.7% ± 0.9%), while G1 had the highest percentage (41.8% ± 2.5%), both with p  

Vinícius Rangel Geraldo-martins - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Er,Cr:YSGG laser, associated or not to desensitizing agents, in the prevention of acid erosion in bovine root dentin
    Lasers in Medical Science, 2019
    Co-Authors: Brenda Ferreira Arantes, Vinícius Rangel Geraldo-martins, Laura Oliveira Mendonça, Regina Guenka Palma-dibb, Juliana Jendiroba Faraoni, Denise Tornavoi De Castro, Cesar Penazzo Lepri
    Abstract:

    This in vitro study evaluated the influence of the Er,Cr:YSGG laser, associated or not to desensitizing agents, in the prevention of acid erosion in bovine root dentin. Eighty dentin specimens were selected and divided into eight groups ( n  = 10): G1: negative control; G2: positive control (5% fluoride varnish-FV); G3: Er,Cr:YSGG laser; G4: FV + laser; G5: 3% potassium oxalate; G6: 3% potassium oxalate + laser; G7: biphasic calcium silicate/phosphate gel (gel); G8: gel + laser. Laser parameters: 0.5 W, 6.25 J/cm^2 at 1-mm distance. The erosive drink used was a cola soft-drink (pH = 2.42 at 4 °C), lasting 5 min, twice a day, with 6-h intervals between the challenges, during 14 days. Kolmogorov-Smirnov and Levene’s tests were satisfied. The surface roughness data were submitted to ANOVA and Tukey post hoc tests. For the wear profile, Kruskal-Wallis and Dunn post hoc tests were used. Afterwards, the Spearman correlation test was performed. All statistical tests assumed a significance level of 5% ( α  = 0.05). G1 presented the highest surface roughness value after the erosive challenge (3.586 μm^2 ± 0.205 μm^2) and the G7 presented the lowest surface roughness value after the erosive challenge (1.071 μm^2 ± 0.180 μm^2). For the lost volume, G4 presented the lowest percentage (9.7% ± 0.9%), while G1 had the highest percentage (41.8% ± 2.5%), both with p  

  • Influence of etching with erbium, chromium:yttrium–scandium–gallium–garnet laser on microleakage of class V restoration
    Lasers in Medical Science, 2010
    Co-Authors: Juliana Marotti, Vinícius Rangel Geraldo-martins, Marina Stella Bello-silva, Carlos Eduardo, Christian Apel, Norbert Gutknecht
    Abstract:

    The aim of this in vitro study was to evaluate some parameters of dental etching when irradiated with an erbium, chromium:yttrium–scandium–gallium–garnet (Er,Cr:YSGG) laser. One-hundred sound human third molars were selected and randomly distributed into ten groups ( n  = 10). The class V cavities of group 1 (control) were prepared with a bur and etched with 37% phosphoric acid, while groups G2 to G10, were prepared with laser (5 W, 88.46 J/cm^2, 90/70% air/water) and etched with the following powers: G3 and G4, 0.25 W; G5 and G6, 0.5 W; G7 and G8, 0.75 W; G9 and G10, 1 W. Group G2 received no laser etching. Prior to restoration, G2, G4, G6, G8 and G10 received acid etching. After restoration, all samples were submitted to a microleakage test. According to statistical analysis (Kruskal–Wallis and Dunn’s tests), G10 presented the lowest microleakage values ( P