A partial denture situation

I had an interesting time trying to fit an upper partial chrome back into a patient who had left it out for a few weeks. The adjustments ended up being on a lonestanding upper molar on the mesial surface of the mesiobuccal cusp and the distal ridge of the distobuccal cusp. I had a few thoughts on this procedure:
-Partial denture can stop fitting due to placement of overcontoured restorations, alterations in the denture (i.e bent clasp), shrinkage of acryllic or movement of teeth.
-Overcontoured restorations should be noticed right after placement unless they haven't brought their denture along.
-Acryllic shrinkage can occur when it is stored  dry but this will probably be noticed soon after construction as they are unlikely to change their storage habits long after construction.
-Movement of teeth occurs over time and is the most common reason for a partial denture spontaneously not fitting. This may occur naturally or occur due to poor denture design i.e un-reciprocated clasps.
-Well designed dentures should hold the teeth in position and so regular use should ensure that the dentures continue to fit well. However when the patient leaves their partial denture out for an extended period of time nature takes effect and the teeth will tend to drift especially if they have experienced some periodontal disease.
-Acryllic dentures are easier to manage poor fit as you can adjust the acryllic around the saddle areas and rebend the wrought wire clasps.Co-Cr dentures are more difficult as the clasps are stiffer and have a higher risk of fracture if bent and there is most commonly metal bounding the saddle areas which are not adjusted easily.
-In this case the areas that required adjustment indicated that the tooth had not drifted bodily (in which case only the mesial surface would be interfering seating. It indicated that the tooth had rotated which is actually very intuitive. Upper molars will tend to rotate around the larger palatal root as it will move slower through the bone than the buccal roots.
-This can also be seen in crowding cases where the molars are rotated. They will tend to rotate with the mesiobuccal cusp turning towards the mesiopalatal aspect. This indicates that there had been some loss of space before the premolars erupted likely due to caries of the primary molars or early loss of the primary molars. A good gain of space can be achieved orthodontically by derotating the molars.