Effect of Er,Cr:YSGG Laser at Different Output Powers on the Micromorphology and the Bond Property of Non-Carious Sclerotic Dentin to Resin Composites

Abstract

BackgroundThe objective of this study was to investigate the influence of Er,Cr:YSGG laser irradiated at different powers on the micromorphology and the bonding property of non-carious sclerotic dentin to resin composites.MethodsTwo hundred bovine incisors characterized by non-carious sclerotic dentin were selected, and the seventy-two teeth of which for surface morphological analysis were divided into nine groups according to various treatments (A: the control group, B: only treated with the adhesive Adper Easy One, C: diamond bur polishing followed by Adper Easy One, D-I: Er,Cr:YSGG laser irradiating at 1W, 2W, 3W, 4W, 5W, 6W output power, respectively, followed by Adper Easy One). The surface roughness values were measured by the non-contact three-dimensional morphology scanner, then the surface micromorphologies of surfaces in all groups were assessed by scanning electron microscopy (SEM); meanwhile, Image Pro-Plus 6.0 software was used to measure the relative percentage of open tubules on SEM images. The rest, one hundred twenty-eight teeth for bond strength test, were divided into eight groups according to the different treatments (A: only treated with the adhesive Adper Easy One, B: diamond bur polishing followed by the above adhesive, C-H: Er,Cr:YSGG laser irradiating at 1 W, 2 W, 3 W, 4 W, 5 W, 6 W output power, respectively, followed by the above adhesive), and each group was subsequently divided into two subgroups according to whether aging is performed (immediately tested and after thermocycling). Micro-shear bond strength test was used to evaluate the bond strength.ResultsThe 4W laser group showed the highest roughness value (30.84±1.93μm), which was statistically higher than the control group and the diamond bur groups (p<0.05). The mean percentages ((27.8±1.8)%, (28.0±2.2)%, (30.0±1.9)%) of open tubules area in the 4W, 5W, 6W group were higher than other groups (p<0.05). The 4W laser group showed the highest micro-shear bond strength not only in immediately tested (17.60±2.55 PMa) but after thermocycling (14.35±2.08MPa).ConclusionThe Er,Cr:YSGG laser at 4W power can effectively improve the bonding property between non-carious sclerotic dentin and resin composites by increasing the roughness and mean percentage area of open tubules.

Micro‐shear bond strength of adhesives with different degrees of acidity: Effect on sound and artificially hypermineralized dentin

“…As limitations of the study, we can mention the impossibility of comparing the results obtained and their application in clinical experimental studies. However, it is important to note that the data from this study is valid for an initial study of this subject and should be considered so that new approaches can be taken to assess the adhesion strength in NCCLs, which are often found in clinical practice (Liao et al, 2019;Sun et al, 2015).…”

“…Clinically there has been an increase in the appearance of non‐carious cervical lesions (NCCLs) resulting from multifactorial problems, such as abrasion, erosion, and corrosion (Liao et al, ; Sun et al, ). The treatment consists mainly of the use of adhesive systems to improve aesthetics and decrease dentin sensitivity (Rocha et al, ).…”

Effect of Laser Conditioning and Different Adhesive Strategies on Bond Strength of a Bulk Fill and a Microhybrid Resin Composite

“…Başaran et al [29] reported that increasing laser output had led to increased SBS values. Besides, lower power laser irradiation does not produce adequate changes on the tooth surface [30]. Thus the output of the laser is of significant importance since adhesion of composite resin restorations has been affected by the laser irradiation [31,32].…”

Clinical effects of laser-based cavity preparation on class V resin-composite fillings

“…Current dental ablative laser systems are based on innovative techniques which enable efficient and secure minimal-invasive hard-tissue preparation [ 8 – 11 ]. Especially in case of Class V lesions, laser-based cavity preparation already showed favourable characteristics In-vitro [ 12 ].…”

“…In this context, it was shown that especially in non-carious lesions, laser-based cavity preparation has a positive effect upon the bonding strength of resin-composite fillings [ 12 ]. In comparison to traditional bur-based treatment procedures, laser preparation leads to the formation of specific micromorphologic surface patterns which are associated with improved bonding characteristics [ 25 ].…”