Purpose: To estimate implant survival and peri-implant bone resorption around long vs normallength implants in full-arch immediate loading rehabilitation of maxillary arches of low bone quality (D4). Materials and Methods: A total of 45 patients received two mesial normallength (10 to 15 mm) or longer (18 to 20 mm) implants and two long (18 to 20 mm) distally tilted implants. Differences in bone resorption at 24 months were assessed using the Mann- Whitney U Test. Results: At the 24-month follow-up, no significant differences were found in survival (global cumulative survival rate: 98.9%) or bone resorption (mean: 1.1 mm) between long and normal implants (P = .053). Conclusion: At 24 months, the use of long implants provides favorable survival and bone maintenance results in the immediate loading rehabilitation of low-quality maxillary arches.