Technologies for merging three-dimensional models of dental impressions

A method comprising:

• generating, by a computing device, a first model and a second model, the first model comprising a first three-dimensional model including a first plurality of geometric faces indicative of a first dental impression of a dental arch of a user, the second model comprising a second three-dimensional model including a second plurality of geometric faces indicative of a second dental impression of the same dental arch of the user;
• aligning the first model and the second model based on an occlusal surface of the first model and a corresponding occlusal surface of the second model;
• removing a geometric face of the first model based on a geometric face of the second model that corresponds to the geometric face of the first model having a depth greater than the geometric face of the first model;
• selecting a geometry of the second model corresponding with the removed geometric face of the first model, the selected geometry of the second model including geometric faces of the second plurality of geometric faces;
• generating a merged model that includes the selected geometry and the geometric faces corresponding to the selected geometry;
• and
• manufacturing a dental aligner based on the merged model, the dental aligner being specific to the dental arch of the user and being configured to reposition one or more teeth of the user.

A computing device for dental impression scan merging, the computing device comprising:

• a processing circuit including a processor and memory, the memory storing instructions that are configured to be executed by the processor to cause the processor to:
• generate a first model and a second model, the first model comprising a first three-dimensional model including a first plurality of geometric faces indicative of a first dental impression of a dental arch of the user, the second model comprising a second three-dimensional model including a second plurality of geometric faces indicative of a second dental impression of the same dental arch of the user;
• align the first model and the second model based on an occlusal surface of the first model and a corresponding occlusal surface of the second model;
• remove a geometric face of the first model based on a geometric face of the second model that corresponds to the geometric face of the first model having a depth greater than the geometric face of the first model;
• select a geometry of the second model corresponding with the removed geometric face of the first model, the selected geometry of the second model including the geometric faces of the second plurality of geometric faces;
• generate a merged model that includes the selected geometry and the geometric faces corresponding to the selected geometry;
• and
• manufacture a dental aligner based on the merged model, the dental aligner being specific to the dental arch of the user and being configured to reposition one or more teeth of the user.