71 Maxillary implant overdentures: four or two implants place regular diameter implants. Since the demand for less invasive treatments (i.e. treatment without reconstructive surgery) remains, this should be recognized by future research. Since bone properties are of interest in these treatments and can currently only be validly analysed during surgery28, a new assessment method may also be needed to enable predictable implant placement in compromised bone conditions. Conclusion Maxillary 4-implant overdentures perform better than maxillary 2-implant overdentures when retained by bars in terms of implant and overdenture survival and therefore remains the gold standard, even though 2 and 4-implant maxillary overdentures perform similarly in terms of marginal bone level change, clinical, masticatory, and patient related outcomes. 4
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