With any denture treatment, there are always negatives to consider. Not all types of treatment are appropriate for all patients. Patient selection is critical.
Depending on the patient, there may the danger of swallowing or aspirating a Nesbit partial.
Patients with bruxism or a heavy bite can overcome the flexible nature of the partial denture, causing it to bend while chewing. Bruxism can also cause the flexible occlusal rests, used to prevent the partial from over-seating, to give way over time. Since the flexible partial is not prevented from flexing downward, in some cases the clasps can begin to bow, allowing the partial denture to become loose and ill-fitting.
Flexible partial dentures work best when they have abutment teeth present on both ends of edentulous areas. But what if the patient doesn’t have any posterior natural teeth? Flexible dental appliances don’t work very well in cases requiring distal extensions. The same flexible properties that are so desirable and make the partial denture comfortable will actually work to dislodge the appliance and hinder the patient’s chewing capabilities.