title: Comparison of osseointegration between laser-etched and magnesium-incorporated oxidized implants in the rabbit femur.
abstract: OBJECTIVE
  To compare the osseointegration of a laser-etched (LE) implant with a magnesium-incorporated oxidized (MgO) implant, evaluating their ability to enhance the bond strength between a titanium substrate and rabbit femur.
  
  
  METHODS
  Two type of dental implants, LE (test, commercially pure [CP] titanium grade 4) and MgO (control, CP titanium grade 4) (length, 8 mm; diameter, 3.3 mm), were evaluated for the surface characteristics using a field emission scanning electron microscope (FE-SEM), an energy dispersive spectrometer (EDS), and an optical three-dimensional profiling system. After that, two types of dental implants were implanted at the right and left distal femoral metaphysis of 10 adult rabbits weighing approximately 3.0 kg. After 6 weeks, histomorphometric analysis, removal torque tests, and surface analysis of the torque-tested implants were performed.
  
  
  RESULTS
  After surgery, the LE group showed thick bonelike materials within the pores observed using FE-SEM (magnifications ×500 and ×900). The mean removal torque was 40.72 ± 13.3 Ncm for the test (LE) implant and 22.26 ± 6.4 Ncm for the control (MgO) implant, respectively (P = .041). The mean bone-implant contact in the three best consecutive threads in the cortical region was 63.35% ± 16.44% in the LE group and 51.63% ± 5.09% in the MgO.
  
  
  CONCLUSIONS
  In the beginning stage of cancellous bone healing, biomechanical properties of the LE implant could influence a more favorable bone response than that of MgO.
authors.affiliation: Department of Prosthodontics, College of Dentistry, Kyung Pook National University, Dae-Gu, South Korea.
authors.forename: Sang-Hwan
authors.initials: SH
authors.lastname: Kang
authors.forename: Jin Hyun
authors.initials: JH
authors.lastname: Cho
authors.forename: Sang-Hun
authors.initials: SH
authors.lastname: Park
authors.forename: Randall
authors.initials: R
authors.lastname: Toothaker
authors.forename: Sung-Am
authors.initials: SA
authors.lastname: Cho
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D045662:Dental Etching / Q000379:methods*; D015921:Dental Implants; D020878:Device Removal / Q000379:methods; D005269:Femur / Q000601:surgery; D007834:Lasers; D008277:Magnesium Oxide; D016348:Osseointegration; D011817:Rabbits; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D019415:Torque
chemical_list: D015921:Dental Implants; D008277:Magnesium Oxide; D014025:Titanium