الفهرس 
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Abstract
This work aimed to evaluate clinically and radiographically the effect of laser microtextured dental implant collar on the crestal bone level around dental implants.
The present study was conducted on ten patients (6 females and 4 males) selected from the Outpatient Clinic of the Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Alexandria University. Each had extracted mandibular single rooted teeth. Their ages ranged between 20 and 40 years with a mean age of 30 years.
Patients were divided into two groups. Laser lok implants were placed in the study group, while conventional implants with machined collars were used in the control group.
Clinical evaluation was performed immediately then after one week for the presence of pain, tenderness, infection and swelling. Delayed follow up was performed at 1, 3 and 6 months to evaluate the modified gingival index, probing depth and implant mobility.
All cases exhibited minimal pain, tenderness and swelling which subsided within few days after surgery. None of them developed neither infection nor mobility throughout the study period. All patients showed a modified gingival score of 0.
The mean probing depth around the laser lok implants hadstatistically significant lesser values than the control group on the 3rd months and 6th months during the postoperative follow up period.
Standardized periapical radiographs were taken immediately, 3 and 6 months post-operatively using XCP film holder. Marginal bone level and bone density changes around the implants were evaluated using the Image J software.(180)
The vertical bone loss around the laser lok implants manifested statistically significant lesser values than the control group at 3 months and 6 months postoperatively.
Furthermore, the peri-implant bone density around the laser lok implants showed no statistically significant difference when compared to the control group throughout the follow up period. However all implants showed increase in the bone density between the baseline and 6 months postoperatively.