Facial shape classification method and denture design device therefor
Disclosed are a facial shape classification method and a denture design device therefor. A facial shape classification method according to an embodiment and a denture design device therefor classify and provide an artificial tooth shape according to the facial shape of a patient, and thus can minimize a user's manipulation, reduce inconvenience, and increase a patient's aesthetic satisfaction.
1 . A facial shape classification method performed by a denture design device, the method comprising:
acquiring facial data of a patient;
extracting a plurality of landmarks from the acquired facial data, the plurality of landmarks including endpoints on both sides of a one-third portion of a forehead area, tragus points on both sides of a face, and gonion points on both sides of the face in the facial data;
calculating a first distance of a first line segment connecting the endpoints on both sides of the one-third portion of the forehead area in the facial data, a second distance of a second line segment connecting the tragus points on both sides of the face, and a third distance of a third line segment connecting the gonion points on both sides of the face;
classifying the facial shape of the patient based on a comparison of the calculated first, second, and third distances;
classifying an artificial tooth shape of the patient according to the classified facial shape; and
displaying, on a screen of the denture design device, an artificial tooth shape classified according to the classified facial shape and a simulation process conducted through a control unit of the denture design device, and outputting the artificial tooth shape through a three-dimensional printer.
2 . The facial shape classification method of claim 1 , wherein in the classifying of the artificial tooth shape of a patient, the artificial tooth shape is classified as at least one of square, tapering, or ovoid, or a combination of at least two thereof according to the facial shape.
3 . The facial shape classification method of claim 1 , wherein in the classifying of the artificial tooth shape of a patient,
when the facial shape is such that first distance=second distance=third distance, or first distance<second distance=third distance, or first distance>second distance=third distance, or first distance=second distance<third distance, the artificial tooth shape is classified as square;
when the facial shape is such that first distance>second distance>third distance, or first distance<second distance<third distance, or first distance>second distance<third distance, the artificial tooth shape is classified as tapering; and
when the facial form is such that first distance<second distance>third distance, the artificial tooth shape may be classified as ovoid,
wherein the first distance is a distance of the first line segment connecting the endpoints on both sides of the one-third portion of the forehead area in the facial data, the second distance may be a distance of the second line segment connecting the tragus points on both sides, and the third distance may be a distance of the third line segment connecting the gonion points on both sides.
4 . The facial shape classification method of claim 1 , further comprising, when there are multiple classified artificial tooth shapes, providing the multiple artificial tooth shapes, receiving a specific artificial tooth shape selected from among the multiple provided artificial tooth shapes through a user action, and providing the selected artificial tooth shape.
5 . The facial shape classification method of claim 1 , further comprising receiving a manipulation signal based on a user action for the provided artificial tooth shape, and modifying and providing the artificial tooth shape.
6 . The facial shape classification method of claim 5 , wherein the modifying and providing of the artificial tooth shape comprises,
when providing a first artificial tooth shape, vertically dividing the first artificial tooth shape into right and left halves while displaying a dividing line, and
in response to selecting either the left half or the right half through a manipulation signal based on a user action, providing a modified artificial tooth shape in which, when the right half is selected, the right half is modified to a second artificial tooth shape, or, when the left half is selected, the left half is modified to a third artificial tooth shape.
7 . The facial shape classification method of claim 5 , wherein the modifying and providing of the artificial tooth shape comprises,
in response to selecting a specific artificial tooth shape through a user manipulation, displaying an artificial tooth replacement list on a screen and
in response to selecting a specific artificial tooth shape from the artificial tooth replacement list through a user manipulation, modifying the artificial tooth shape to the selected artificial tooth shape and providing the modified artificial tooth shape.
8 . A denture design device comprising:
a data acquisition unit configured to acquire facial data of a patient;
a control unit configured to extract a plurality of landmarks from the acquired facial data, the plurality of landmarks including endpoints on both sides of a one-third portion of a forehead area, tragus points on both sides of a face, and gonion points on both sides of the face in the facial data, calculate a first distance of a first line segment connecting the endpoints on both sides of the one-third portion of the forehead area in the facial data, a second distance of a second line segment connecting the tragus points on both sides of the face, and a third distance of a third line segment connecting the gonion points on both sides of the face, classify a facial shape of the patient based on a comparison of the calculated first distance, second distance, and third distance, and classify an artificial tooth shape of the patient according to the classified facial shape; and
an output unit configured to display, on a screen of the denture design device, the artificial tooth shape classified according to the classified facial shape and a simulation process conducted through the control unit of the denture design device, and output the artificial tooth shape through a three-dimensional printer.