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237 results on '"Nammour, S."'

20. Effect of acid etching duration on tensile bond strength of composite resin bonded to erbium:yttrium-aluminium-garnet laser-prepared dentine. Preliminary study

Author

UCL - MD/MNOP - Département de morphologie normale et pathologique, Chousterman, M., Heysselaer, D., Dridi, S. M., Bayet, F., Misset, B., Lamard, L., Peremans, A., Behets Wydemans, Catherine, Nammour, S., UCL - MD/MNOP - Département de morphologie normale et pathologique, Chousterman, M., Heysselaer, D., Dridi, S. M., Bayet, F., Misset, B., Lamard, L., Peremans, A., Behets Wydemans, Catherine, and Nammour, S.

Abstract

The purpose of this study was to compare the tensile bond strength of composite resin bonded to erbium:yttrium-aluminium-garnet (Er:YAG) laser-prepared dentine after different durations of acid etching. The occlusal third of 68 human third molars was removed in order to expose the dentine surface. The teeth were randomly divided into five groups: group B (control group), prepared with bur and total etch system with 15 s acid etching [37% orthophosphoric acid (H3PO4)]; group L15, laser photo-ablated dentine (200 mJ) (laser irradiation conditions: pulse duration 100 A mu s, air-water spray, fluence 31.45 J/ cm(2), 10 Hz, non-contact hand pieces, beam spot size 0.9 mm, irradiation speed 3 mm/s, and total irradiation time 2 x 40 s); group L30, laser prepared, laser conditioned and 30 s acid etching; group L60, laser prepared, laser conditioned and 60 s acid etching; group L90, laser prepared, laser conditioned and 90 s acid etching. A plot of composite resin was bonded onto each exposed dentine and then tested for tensile bond strength. The values obtained were statistically analysed by analysis of variance (ANOVA) coupled with the Tukey-Kramer test at the 95 % level. A 90 s acid etching before bonding showed the best bonding value (P < 0.05) when compared with all the other groups including the control group. There is no significance difference between other groups, nor within each group and the control group. There was a significant increase in tensile bond strength of the samples acid etched for 90 s.

Published
2010

21. Effect of low fluency dentin conditioning on tensile bond strength of composite bonded to Er : YAG laser-prepared dentin: a preliminary study.

Author

Faculty of Medicine, University of Liège - Department of Dental Sciences, Faculty of Medicine, University of Liege - Department of Dental Sciences, FUNDP - FUNDP, UCL - SSS/IREC/MORF - Pôle de Morphologie, Bahrami, B, Askari, N, Tielemans, M, Heysselaer, D, Lamard, L, Peremans, A, Behets Wydemans, Catherine, Nammour, S, Faculty of Medicine, University of Liège - Department of Dental Sciences, Faculty of Medicine, University of Liege - Department of Dental Sciences, FUNDP - FUNDP, UCL - SSS/IREC/MORF - Pôle de Morphologie, Bahrami, B, Askari, N, Tielemans, M, Heysselaer, D, Lamard, L, Peremans, A, Behets Wydemans, Catherine, and Nammour, S

Abstract

Several studies in the literature have previously shown that the bond strength of a composite bonded to dentin is almost equivalent as when dentin is prepared by either bur or Er:YAG laser. The aim of this preliminary study is to assess the hypothesis that dentin conditioning at low fluency by means of Er:YAG laser can improve the value of adhesion of composites resin to dentin. Sixty surfaces of caries-free human third molars extracted for orthodontic purposes were randomly divided into five groups of 12 teeth. The bur group was the control, prepared using bur, group L was prepared using Er:YAG 200 mJ, SSP (50 µs), 20 Hz, 15 seconds of sweeping, for groups L80, L100, L120, they were prepared first, with the same parameters of the group L 200, and then they received a conditioning, which is, respectively, 15 s of irradiations at: 80 mJ (SSP, 10 Hz), 100 mJ (SSP, 10 Hz), and 120 mJ (SSP, 10 Hz). All samples were restored in a single-component adhesive system: Xenon (DENTSPLY), and ceramX (DENTSPLY) as the resin composite. The specimens were submitted to tensile bond strength test using a universal testing machine. Data were submitted to statistical analysis using ANOVA coupled to a Tukey-Kramer test at the 95% level. The mean values in MPa were 33.3 for group B, 36.73 for group L 200, 41.7 for group L80, 37.9 for group L100, and 39.1 for group L120. Our results showed that dentin conditioning at a low fluency of 12.58 J/cm(2) per pulse, with 80 mJ output energy and 50-µs pulse duration can significantly improve tensile bond strength of a composite bonded to Er:YAG laser-prepared dentine.

Published
2010

22. Effect of low fluency dentin conditioning on tensile bond strength of composite bonded to Er:YAG laser-prepared dentin : a preliminary study

Author

Faculty of Medicine, University of Liege - Department of dental sciences, Faculty of Medicine, university of Liege - Department of Dental Sciences, facultyFaculty of Medicine, university of Liege - Departement of dental sciences, Faculty of Medicine, university of Liege - Department of dental sciences, FUNDP - SPHY_LLS (laboratoire laser et spectroscopie), UCL - MD/MNOP - Département de morphologie normale et pathologique, Bahrami, B, Askari, N, Tielemans, M, Heysselaer, D, Lamard, L, Peremans, A, Behets Wydemans, Catherine, Nammour, S, Faculty of Medicine, University of Liege - Department of dental sciences, Faculty of Medicine, university of Liege - Department of Dental Sciences, facultyFaculty of Medicine, university of Liege - Departement of dental sciences, Faculty of Medicine, university of Liege - Department of dental sciences, FUNDP - SPHY_LLS (laboratoire laser et spectroscopie), UCL - MD/MNOP - Département de morphologie normale et pathologique, Bahrami, B, Askari, N, Tielemans, M, Heysselaer, D, Lamard, L, Peremans, A, Behets Wydemans, Catherine, and Nammour, S

Published
2010

50. Increased Resistance To Artificial Caries-like Lesions in Dentin Treated With Co2-laser

Author

UCL - Autre, Nammour, S., Renneboogsquilbin, C., Behets Wydemans, Catherine, UCL - Autre, Nammour, S., Renneboogsquilbin, C., and Behets Wydemans, Catherine

Abstract

The crowns of 60 permanent human molars were sectioned transversally. The exposed dentin surface was divided into different parts: a first part was kept as control, a second part was immediately varnished, and a third part was irradiated with a CO2 laser using the same irradiation conditions as those a applied for caries removal (10 impulses of the same energy; 0.2 s/impulse; energy density/impulse 280-715 J/cm2. After irradiation, a small portion of this area was varnished. The teeth were immersed for 4 weeks in a cariogenic gel (pH = 4.5) at 36-degrees-C. Twenty teeth were studied by scanning electron microscopy, and longitudinal sections of the other teeth were prepared for microradiography and microdensitometry measurements. The lased dentin surface appeared smooth for energy densities lower than 425 J/cm2. Longitudinally fractured samples revealed a layer of dentin devoid of tubular structure (20-70-mu-m thick, depending on the energy density used), whereas below the sealed layer, the dentinal tubules retained their normal aspect. Although the sealed layer showed no demineralization when exposed to acid, demineralization of the underlying dentin occurred, but to a much lesser extent than in the unlased dentin.

Published
1992

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