One theory that I have heard (at a Spear Seminar on worn teeth) is that people at night place their jaws in and edge to edge position that they normally would go to during normal day time function. Often with patients with abnormal wear patterns you can get them to manipulate their jaws to a position where the lower and upper jaws fit together almost like pieces in a puzzle and it only makes sense that their own para functional night time habits are causing this pattern of wear.
The simplest solution to this problem is for patients to commit to wearing a night guard each and every night that will not allow this wear to continue. I have attempted to bond edges that are showing this type of wear, but eventually if no night guard is worn the bonding will chipp off, just like their original teeth experinece wear and chipping.
Wnen I have paitnets who do wear their night guards religiously, their bonded repairs work much better and can last a long time.