Method for detecting morphological difference between three-dimensional digital models of tooth

A computer-implemented method for detecting a morphological difference between three-dimensional digital models of a tooth, comprising:

• obtaining first and second three-dimensional digital models which are two three-dimensional digital models representing a same tooth;
• performing alignment between the first and second three-dimensional digital models;
• based on the first and second three-dimensional digital models after the alignment, determining vertices of the first three-dimensional digital model and corresponding points of the second three-dimensional digital model to constitute a first point pair set comprising multiple first point pairs;
• dividing the multiple first point pairs into groups based on distances of respective first point pairs;
• and
• detecting a morphological difference between the first and second three-dimensional digital models by determining a category of a morphological difference in a region corresponding to each group based on distances of first point pairs in the each group;
• wherein the category comprises at least one of:
• a morphological difference caused by tooth wear, a morphological difference caused by changes in a gum line, or a morphological difference caused by an attachment.