Common Fractures and Breakages
The most common cause of fracture, as observed by Hawler Medical University, is poor fit. As you chew and bite with your denture, you apply a force that causes micro fractures in the denture material. If the upper and lower set don't align evenly, for example, you risk putting too much pressure on one area. Eventually a large break occurs, which may reveal a crack to let you know it needs to be fixed.
Impact fractures are likely as well, caused by dropping the denture or partial. This can break the denture at any point in the appliance, such as the teeth or even the pink region representing your gumline. The metal clasps of the partial denture can also suffer damage, and should not be put back in your mouth afterward. Luckily, dentures are made from materials allowing for denture repair.