الفهرس 
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Abstract
This study was performed to evaluate the effect of Er,Cr:YSGG LASER biomodulation on the bone loss around All-on-4 implants immediately loaded with hybrid prostheses.
Fourteen patients were selected to share in this study from the out-patient clinic of prosthodontic department, Faculty of Dentistry, Ain-shams University.
Patients were randomly divided into two equal groups.
Patients received four implants placed according to the All-on-4® concept.
Surgical stereolithographic radiographic guides fabricated from the dual scan imaging technique were used to guide implant placement.
group A:
Sequential drilling was done in a regular manner.
group B:
Sequential drilling was done in a regular manner.
Then osteotomy site was biomodulated using Er,Cr:YSGG (2790nm) LASER with a radial firing tip. .
Stability of the implants was measured using Ostell to ensure immediate loading was possible.
Provisional hybrid prostheses were delivered to the patient on the day of surgery.
In2guide soft-ware was used to measure the height of bone from the abutment occlusal surface to the crest of the ridge to evaluate the bone loss around the implants.
Measurements were done using cone beam CT to evaluate the bone loss around the implants at mid buccal, mid-lingual, distal and mesial immediately, and after six months and one year.
Results showed less bone loss around the implants in the Er,Cr:YSGG group when compared to the conventional group.