Systems and methods for forming eruption compensation features for accommodating erupting teeth
Systems and methods for forming eruption compensation (EC) features in dental appliances for accommodating erupting teeth. Methods may include scaling a virtual tooth model by identifying a crown center line along a buccal-lingual axis of the virtual tooth model, enlarging a lingual side of the virtual tooth model relative to the crown center line by a first scaling factor, and enlarging a buccal side of the virtual tooth model relative to the crown center line by a second scaling factor, where the first scaling factor is greater than the second scaling factor. The scaled virtual tooth model may be added to a 3D dental model of the subject's dentition at an EC region to form a modified 3D dental model. The modified 3D dental model including the scaled virtual tooth model corresponding to the erupting tooth may be output.
1 . A method, the method comprising:
defining, on a segmented three-dimensional (3D) dental model of a subject's dentition, an eruption compensation (EC) region for accommodating an erupting tooth in the 3D dental model by:
identifying a virtual tooth model corresponding to the erupting tooth;
scaling the virtual tooth model, wherein the scaling comprises:
identifying a crown center line along a buccal-lingual axis of the virtual tooth model;
enlarging a lingual side of the virtual tooth model relative to the crown center line by a first scaling factor; and
enlarging a buccal side of the virtual tooth model relative to the crown center line by a second scaling factor, wherein the first scaling factor is greater than the second scaling factor; and
adding the scaled virtual tooth model to the 3D dental model of the subject's dentition at the EC region to form a modified 3D dental model; and
outputting the modified 3D dental model including the scaled virtual tooth model corresponding to the erupting tooth.
2 . The method of claim 1 , wherein each of the first and second scaling factors range between about 1.05 and about 1.3.
3 . The method of claim 1 , further comprising adjusting a size, a shape, or a size and shape of a root portion of the scaled virtual tooth model such that the root portion remains within a gingival region of the modified 3D dental model.
4 . The method of claim 3 , wherein adjusting the size, the shape or the size and shape of the root portion comprises tapering the root portion of the scaled virtual tooth model.
5 . The method of claim 1 , further comprising identifying that the subject's dentition includes an erupting tooth, wherein the erupting tooth is unerupted or partially erupted.
6 . The method of claim 5 , wherein identifying the virtual tooth model corresponding to the erupting tooth comprises identifying the virtual tooth model from one or more of: a library of virtual tooth models, a scaled-up scan of the erupting tooth, a tooth adjacent to the unerupted or erupting tooth, an opposing tooth to the erupting tooth, or a counterpart tooth to the erupting tooth.
7 . The method of claim 1 , further comprising generating a treatment plan using the modified 3D dental model, wherein the treatment plan includes one or more treatment stage operations to move the subject's dentition from a first arrangement toward a target arrangement.
8 . The method of claim 1 , further comprising fabricating a dental appliance including an EC feature having a shape corresponding to the scaled virtual tooth model to provide space for the erupting tooth when the subject wears the dental appliance.
9 . The method of claim 1 , further comprising receiving one or more images of the subject's dentition and generating the segmented 3D dental model of the subject's dentition.
10 . The method of claim 1 , further comprising adjusting the first scaling factor and/or the second scaling factor to avoid collision of the EC region with a tooth of the opposing dental arch of the subject when the subject bites.
11 . The method of claim 1 , wherein defining the EC regions is part of a porting process to generate a treatment plan.
12 . The method of claim 11 , wherein the porting process comprises converting a first data file to a second data file, the second data file having a reduced size compared to the first data file.
13 . The method of claim 1 , wherein outputting comprises generating one or more dental appliances including the EC region.
14 . The method of claim 1 , wherein identifying the virtual tooth model comprises determining a geometry of the virtual tooth model based on a geometry of one or more teeth of the subject's dentition of the same type as the erupting tooth.
15 . The method of claim 1 , further comprising positioning the virtual tooth model within the 3D dental model of the subject's dentition prior to scaling the virtual tooth model.
16 . A system comprising:
one or more computing devices comprising:
one or more processors;
memory operationally coupled to the one or more processors, wherein the memory includes computer-program instructions that, when executed by the one or more processors, cause the one or more computing devices to perform a computer-implemented method comprising:
defining, on a segmented three-dimensional (3D) dental model of a subject's dentition, an eruption compensation (EC) region for accommodating an erupting tooth in the 3D dental model by:
identifying a virtual tooth model corresponding to the erupting tooth;
scaling the virtual tooth model, wherein the scaling comprises:
identifying a crown center line along a buccal-lingual axis of the virtual tooth model;
enlarging a lingual side of the virtual tooth model relative to the crown center line by a first scaling factor; and
enlarging a buccal side of the virtual tooth model relative to the crown center line by a second scaling factor, wherein the first scaling factor is greater than the second scaling factor; and
adding the scaled virtual tooth model to the 3D dental model of the subject's dentition at the EC region to form a modified 3D dental model; and
outputting the modified 3D dental model including the scaled virtual tooth model corresponding to the erupting tooth.
17 . A method, the method comprising:
defining, on a segmented three-dimensional (3D) dental model of a subject's dentition, an eruption compensation (EC) region for accommodating an erupting tooth in the 3D dental model by:
identifying a virtual tooth model corresponding to the erupting tooth;
asymmetrically scaling a lingual side and a buccal side of the virtual tooth model, wherein the asymmetrically scaling comprises identifying a crown center line along a buccal-lingual axis of the virtual tooth model, enlarging the lingual side relative to the crown center line by a first scaling factor, and enlarging the buccal side relative to the crown center line by a second scaling factor, wherein the first scaling factor is greater than the second scaling factor; and
adding the asymmetrically scaled virtual tooth model to the 3D dental model of the subject's dentition at the EC region to form a modified 3D dental model; and
outputting the modified 3D dental model including the asymmetrically scaled virtual tooth model corresponding to the erupting tooth.
18 . The method of claim 17 , further comprising adjusting the first scaling factor and/or the second scaling factor to avoid collision of the EC region with a tooth of the opposing dental arch of the subject when the subject bites.