The immediate progressive loading protocol yields a more predictable bone reaction in the periimplant crestal bone and ensures better implant prognosis than the immediate functional loading protocol; supporting the idea that gradual loading or stimulation will allow bone to mature and grow denser in a 2-year implant follow-up period.

This high failure rate presented in this report may be explained by 1 or more of the following reasons: poor maxillary bone quality, nonaxial loading of the implants, nonrigid splinting material, high forces delivered from the opposing dentition, and/or patients with para-functional habits.

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