title: Biomechanical and histologic evaluation of non-washed resorbable blasting media and alumina-blasted/acid-etched surfaces.
abstract: OBJECTIVE
  To compare the biomechanical fixation and histomorphometric parameters between two implant surfaces: non-washed resorbable blasting media (NWRBM) and alumina-blasted/acid-etched (AB/AE), in a dog model.
  
  
  METHODS
  The surface topography was assessed by scanning electron microscopy, optical interferometry and chemistry by X-ray photoelectron spectroscopy (XPS). Six beagle dogs of ∼1.5 years of age were utilized and each animal received one implant of each surface per limb (distal radii sites). After a healing period of 3 weeks, the animals were euthanized and half of the implants were biomechanically tested (removal torque) and the other half was referred to nondecalcified histology processing. Histomorphometric analysis considered bone-to-implant contact (BIC) and bone area fraction occupancy (BAFO). Following data normality check with the Kolmogorov-Smirnov test, statistical analysis was performed by paired t-tests at 95% level of significance.
  
  
  RESULTS
  Surface roughness parameters S(a) (average surface roughness) and S(q) (mean root square of the surface) were significantly lower for the NWRBM compared with AB/AE. The XPS spectra revealed the presence of Ca and P in the NWRBM. While no significant differences were observed for both BIC and BAFO parameters (P>0.35 and P>0.11, respectively), a significantly higher level of torque was observed for the NWRBM group (P=0.01). Bone morphology was similar between groups, which presented newly formed woven bone in proximity with the implant surfaces.
  
  
  CONCLUSIONS
  A significant increase in early biomechanical fixation was observed for implants presenting the NWRBM surface.
authors: Department of Biomaterials and Biomimetics, New York University, New York, NY, USA.
authors: Paulo G
authors: PG
authors: Coelho
authors: Charles
authors: C
authors: Marin
authors: Rodrigo
authors: R
authors: Granato
authors: Gabriela
authors: G
authors: Giro
authors: Marcelo
authors: M
authors: Suzuki
authors: Estevam A
authors: EA
authors: Bonfante
mesh_terms: D020341:Absorbable Implants; D000134:Acid Etching, Dental; D000537:Aluminum Oxide; D000818:Animals; D001696:Biomechanical Phenomena; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D004285:Dogs; D008855:Microscopy, Electron, Scanning; D023421:Models, Animal; D056951:Photoelectron Spectroscopy; D018709:Statistics, Nonparametric; D013499:Surface Properties; D019415:Torque
chemical_list: D015921:Dental Implants; D000537:Aluminum Oxide