title: The influence of laser-textured dentinal surface on bond strength.
abstract: OBJECTIVE
  To assess the influence of laser-textured surfaces on the adhesion of composite to dentin after being rotary prepared.
  
  
  METHODS
  Thirty healthy teeth were kept in 0.1% thymol solution prior to being ground down to dentin to create a 4 × 4 mm² flat surface. Teeth were divided into 3 groups (n=10). Groups 1 and 2 utilized the prototype Erbium doped, Yttrium-Aluminum-Garnet Er:YAG laser by Dental Photonics, Inc. A single pulse was delivered to each spot to create an equally spaced square 4 × 4 mm² matrix of micro craters. All craters had 100 μm diameter/45 μm depth; two different spacing patterns were prepared in Groups 1 and 2. In Group 1, distance between crater centers was 50 μm; Group 2 had 100 μm. In Group 3 (control), 10 samples were prepared without laser texturing. G-bond (GC America) was applied to testing area of all samples in all groups according to manufacturer's instructions. Bonding resin was applied and shear-bond strength tests were employed using an Instron machine to measure adhesive strength.
  
  
  RESULTS
  One-way analysis of variance (ANOVA) was used to compare the 3 groups. Pair wise t-tests implementing the Bonferroni correction for multiple comparisons found a statistically significant difference between Group 3 and Group 2 (p=0.019) but no statistically significant difference between Group 3 and Group 1 (p=0.263) or Group 1 and Group 2 (p=0.743).
  
  
  CONCLUSIONS
  The bond strengths between bonded composite to laser-textured dentinal surfaces with larger spacing patterns are greater than that of non-textured surfaces.
authors.affiliation: Department of Research Administration, Tufts University School of Dental Medicine, Boston, MA, USA.
authors.forename: Arman
authors.initials: A
authors.lastname: Samad-Zadeh
authors.forename: Masly
authors.initials: M
authors.lastname: Harsono
authors.forename: Andrey
authors.initials: A
authors.lastname: Belikov
authors.forename: Ksenia V
authors.initials: KV
authors.lastname: Shatilova
authors.forename: Alexey
authors.initials: A
authors.lastname: Skripnik
authors.forename: Paul
authors.initials: P
authors.lastname: Stark
authors.forename: Christophe
authors.initials: C
authors.lastname: Egles
authors.forename: Gerard
authors.initials: G
authors.lastname: Kugel
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching / Q000295:instrumentation; D003799:Dental Stress Analysis; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents; D006801:Humans; D053844:Lasers, Solid-State; D008689:Methacrylates; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D019279:Resin Cements