title: An In Vitro Comparison of the Bond Strength of Composite to Superficial and Deep Dentin, Treated With Er:YAG Laser Irradiation or Acid-Etching.
abstract: Introduction:The aim of this study was to compare the micro-shear bond strength of composite resin on superficial and deep dentin after conditioning with phosphoric acid and Erbium-Doped Yttrium Aluminum Garnet (Er:YAG) laser.Methods:Thirty human molars were selected, roots were removed and crowns were bisected to provide a total of 60 half-crowns. Specimens were ground to expose superficial and deep dentin. Samples were assigned to six groups: (1) AS (acid etching of superficial dentin); (2) AD (acid etching of deep dentin); (3) LS (Er:YAG laser irradiation on superficial dentin); (4) LD (Er:YAG laser irradiation on deep dentin); (5) LAS (Er:YAG laser irradiation on superficial dentin followed by acid etching); (6) LAD (Er:YAG laser irradiation on deep dentin followed by acid etching) The adhesive protocol was performed. Samples were thermocycled and micro-shear bond strength was tested to failure. The data were submitted to statistical analysis with one-way analysis of variance (ANOVA) and Tukey post hoc test.Results:The AS group, demonstrated the greatest amount of micro-shear bond strength. Statistical analysis showed a decrease in bond strength in laser-treated groups which was more significant for deep dentin.Conclusion:Preparation of dentin with laser did not improve bonding to superficial and deep dentin.
authors.affiliation: Dental Materials Researches Center, Babol Medical Sciences University, Babol, Iran.
authors.forename: Homayoon
authors.initials: H
authors.lastname: Alaghehmand
authors.affiliation: Dental Material Research Center, Department of Restorative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Nezhad Nasrollah
authors.affiliation: School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Hanieh
authors.initials: H
authors.lastname: Nokhbatolfoghahaei
authors.affiliation: Laser Research Center in Medical Sciences (LRCMS), Department of Periodontics, Faculty of Dentistry, AJA University of Medical Sciences, Tehran, Iran ; International Network for Photo Medicine and Photo Dynamic Therapy (INPMPDT), Universal Scientific Education and Research Network (USERN), Tehran, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Fekrazad
keywords: acid-etch; bond strength; composite; laser; micro-shear bond strength