Objectives: This study aimed at assessing the effect of application of  hyaluronic acid on stability of immediate loading implant in posterior maxilla. methods: Twenty implants were placed in fourteen patients in posterior maxillary region.Ten implants were placed in each group, in the control group non coated implant was placed while in the study group hyaluronic acid coated implant was used. results: there was significant difference in the bone density from the buccal aspect in favor of the study group. Conclusion: HAhas  a synergistic experimental and clinical effectiveness on quality and quantity of bone.