Aim: The objective of this randomized clinical trial was to enhance the effect of HY alone or in combination with a bone graft in changing peri-implant tissue dimensions radiographically. Materials and Methods: Thirty-six patients who required posterior dental implants were randomly assigned to three groups (n=12 each): a control group (CONT) with conventional implant placement was performed, one group treated with HA (HY), and another test group treated with HA and bone graft together (HYB). The same surgical procedure was performed for all implants in the posterior regions of jawbones. Measurements were taken before surgery, after surgery, and at eight and sixteen weeks after surgery. Results: Hybrid group (HYB) had a significantly greater increase radiographic soft tissue thickness at all-time points (P < 0.001). The HYB group had higher radiographic bone height at week 16 and stability of bone width (P = 0.088) than the other groups (P < 0.001) Conclusion: The combined application of a bone graft and hyaluronic acid (HYB) significantly improves the radiographic soft tissue thickness and bone height.