Objectives: This retrospective study evaluated the influence of Laser-Lok microtextured 
surface (LMS) implants on changes in marginal bone level after immediate implant 
placement, in maxillary and mandibular posterior fresh sockets with hydroxyapatite 
agarose gel.  
Material and Methods: This study was designed as a retrospective study with a 3-year 
follow-up.   
Forty patients (12 men, 28 women), who underwent  immediate implant placement in our
 department, received 40 implants between 2011 and 2014.    The test group (n = 20) had
 LMS implants placed, and the control group (n = 20) had machined collared (MC) 
implants  placed.  Implants were placed in the maxillary and mandibular posterior region
 where bony defect height was > 5mm,   After implantation, the gap was filled with 
synthetic bone substitutehydroxyapatite agarose (HA/agarose) gel and the site was 
left open.  Clinical and radiographic evaluations were performed immediately after
implantation and 3 years thereafter. 
Results:  Mean reductions in proximal bone defect depth were 78.6% in the LMS group 
and 47.4% in the MC group (p = 0.02).  The residual marginal bone defect at 3 years was 
significantly deeper in the MC group (p = 0.018), and the mean deepest probing depths 
(PDs) were 1.17 mm in the LMS group and 4.11 mm in the MC group (p < 0.01).
Conclusion: Application of Laser-Lok microtextured grooves to the implant collar resulted 
in bone healing, and shallower PD than implantation with a MC implant in immediately 
placed implants in posterior fresh sockets combined with HA/agarose gel.

Laser-Lok microtextured collar implant in a posterior fresh socket with hydroxyapatite agarose gel