Influence of femtosecond laser treatment on shear bond strength of composite resin bonding to human dentin under simulated pulpal pressure

Abstract

This in vitro study evaluated the influence of femtosecond laser (fs-laser)-generated patterns on shear bond strength (SBS) of composite resin bonded to human dentin under simulated pulpal pressure. Laser treatment was used to produce two different patterns on dentin surfaces. Three test groups and a control group without laser treatment under pulpal pressure were investigated. Dentin discs of 800 nm thickness were cut from 60 extracted caries-free human molars. Using a perfusion machine, the discs were exposed to Ringer solution on their basal surfaces. Clearfil SE Bond/ Herculite XRV system was used. The samples were stored in distilled water and thermocycled. Bonding failures caused by a test set-up to challenge SBS were analyzed by scanning electron microscope (SEM). An 80 lm-sized cube-shaped pattern caused more cohesive failures in dentin or resin compared with the 160 lm-sized cube-shaped pattern. Weibull statistics demonstrated a significant difference between the two laser patterns, but only the test group with small-sized laser pattern was significantly different from the control group. The Weibull moduli ranged from 4.3 to 9.6 (control group). The 160 lm-sized pattern enhanced the bonding quality and avoided dentin weakening. It was concluded that fslaser treatment in a 160 lm-sized cube-shaped pattern enabled a simplified bonding procedure by dispensing the primer without affecting SBS, compared with the control group.

Effect of Cavity Disinfectants on Dentin Bond Strength and Clinical Success of Composite Restorations—A Systematic Review of In Vitro, In Situ and Clinical Studies

“…As regards to the storage medium to preserve teeth after extraction until its use in the experimental procedures, most of the authors reported the use of thymol [ 15 , 17 , 18 , 25 , 28 , 35 , 36 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 ], chloramine [ 13 , 14 , 23 , 26 , 27 , 29 , 30 , …”

“…The majority of the authors [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 23 , 25 , 26 , 27 , 28 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 38 , 39 , 40 , 41 , 43 , 44 , 45 , 46 , 47 , 48 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 58 , 59 , 60 , 61 , 63 , 64 , 65 , 67 , 68 , 69 , 70 , 71 , 73 , 74 , 75 , 76 , 77 , 78 ,…”

Effect of the additive dentine conditioning in all-in-one adhesives on the bonding strength at simulated intrapulpal pressure

“…To detect a difference between the groups, a sample of 15 dentine discs per test and control group was necessary to have an 80% power at alpha = 0.05 [19]…”

“…From a clinical point of view, mean SBS values are less relevant than the likelihood that strong adhesion will be achieved with a given system or that its bond strength will be low and the risk of adhesive failure high [19]. The Weibull distribution takes this probabilistic approach of adhesive evaluation into account.…”

“…As a precondition for the further procedure, the test room was set up to have a constant temperature of 22 °C and a humidity of 50%. The dentine discs produced were inserted into a disk chamber that had been modifi ed by Szép in 2003 and 2012 ( Figure 1); the disk chamber allows the simulation of the intrapulpal fl uid fl ow [19,20]. At the end of the apparatus was a 60 cm high liquid column of Ringer's solution (22 °C), the level of which was kept constant by a gravity infusion device (Intrafi x Air, Braun, Melsungen, Germany) ( Figure 2).…”