title: [SEM comparative analysis of the composite diacrylic resin-enamel interface in laser and bur prepared cavities].
abstract: The aim of this study was to demonstrate that the size of the hybrid layer (HL) in the prepared enamel mechanic (M) and kinetic (K) with laser (WaterlaseMDBiolase), evaluated by scanning electron microscopy (SEM) restored with two types of resin composite is different.
  
  
  METHODS
  The study was realized in vitro on a sample of 40 extracted human premolar and molars teeth for orthodontic or periodontal reasons. The teeth were divided at random into equal four groups (Gr). There has been Class I cavities with a depth of 2 mm (M) at high and low speed with cylindrical diamond No.1 and globular carbide and (K) peaks MZ6-5, 5W+20 Hz 30% water 60% air. The teeth were restored using 3M Schotchbond Etch, 3M Single Bond Dental Adhesive System: Gr. 1: (K)(n = 10)-3M Filtekflow; Gr.2 : (K)(n = 10)3M FiltekZ250; Gr.3: (M)(n = 10)3M Filtekflow; Gr.4: (M)(n = 10)3M FiltekZ250. The materials were placed in a single layer and photoactivate source LED SmartLite (Dentsply), termocycling 500 cycles (5 degrees-55 degrees), stored (48h), cut lengthwise (diamond), polished, conditioned (H3PO4-37% -5s) analyzed by SEM (JEOLJSM 6390), SPSS 13.00 statistically analyzed (ANOVA, p = 0.05).
  
  
  RESULTS
  Analysis of the (HL) has highlighted differences between groups p = 0.05 average size (HL) being Gr.1;20.80 (+/- 0.72)microm, Gr.2;4.034 (+/- 0.0076)microm, Gr.3, 14.13 (+/- 0.63)microm, Gr.4, 1,43 (+/- 0.16)microm. Value size (HL) was influenced by the cavity preparation method for samples prepared by laser p = 0,005 in terms of size and in advantage of mechanical preparations in terms of quality (HL). Also the value of (HL) size was influenced by the type of material used in advance Gr.2 p = 0.0017.
  
  
  CONCLUSIONS
  The sealing of cavity depends more on the creep of materials and less on the type of preparation. Permission was obtained from a institutional ethical committee of "Gr.T. Popa" University of Medicine and Pharmacy Iaşi and that subjects gave written, informed consent).
authors.affiliation: Universităţii de Medicină si Farmacie Gr.T. Popa Iaşi.
authors.forename: Irina
authors.initials: I
authors.lastname: Bamboi
authors.forename: Cătălina Iulia
authors.initials: CI
authors.lastname: Săveanu
authors.forename: I
authors.initials: I
authors.lastname: Dănilă
authors.forename: H
authors.initials: H
authors.lastname: Chiriac
authors.forename: Carmen
authors.initials: C
authors.lastname: Gherasim
mesh_terms: D000465:Algorithms; D000704:Analysis of Variance; D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry; D003731:Dental Caries / Q000628:therapy*; D003736:Dental Cavity Lining / Q000379:methods; D003737:Dental Cavity Preparation / Q000379:methods; D003743:Dental Enamel; D003755:Dental High-Speed Technique; D018772:Dental Marginal Adaptation; D017220:Dentin-Bonding Agents; D006801:Humans; D066298:In Vitro Techniques; D007834:Lasers; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008963:Molar
chemical_list: C114659:3M Single Bond Dental Adhesive; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C041979:2,2-bis-(4-(2-methacryloxyethoxy)phenyl)propane