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Artificial tooth

  • US 8,403,669 B2
  • Filed: 04/18/2007
  • Issued: 03/26/2013
  • Est. Priority Date: 04/18/2007
  • Status: Active Grant
First Claim
Patent Images

1. A set of artificial teeth comprising:

  • an artificial tooth of a mandibular first premolar tooth (10) having a buccal cusp tip (11), a lingual cusp tip (12), a mesial pit (13a), and a distal pit (13b), wherein,a) with the distal pit (13b) being an origin of XYZ orthogonal coordinates of this tooth (10), an arrangement is determined such that (i) a line segment connecting between a point (M1a) for internally dividing a line segment connecting between the mesial pit (13a) and the distal pit (13b) by 29;

    71 and a point (M1b) for internally dividing a line segment connecting between the buccal cusp tip (11) and the lingual cusp tip (12) by 47;

    53 is parallel to the Z-axis, (ii) a line segment connecting between the mesial pit (13a) and the distal pit (13b) is parallel to the XZ plane of the XYZ orthogonal coordinates, and (iii) an X-coordinate value of the mesial pit (13a) is less than an X-coordinate value of the distal pit (13b),b) a ratio of a distance, measured along the X-axis, from the distal pit (13b) to a mesial surface (14a) of the tooth (10) which is at a minimum position of the X-coordinate value of the tooth (10), to a distance, measured along the X-axis, from the distal pit (13b) to a distal surface (14b) of the tooth (10) which is at a maximum position of X-coordinate value of the tooth (10) is 75;

    25 to 85;

    15,c) a ratio of a distance, measured along the Y-axis, from the distal pit (13b) to a buccal surface (14c) of the tooth (10) which is at a maximum position of Y-coordinate value of the tooth (10), to a distance, measured along the Y-axis, from the distal pit (13b) to a lingual surface (14d) of the tooth (10) which is at a minimum position of Y-coordinate value of the tooth (10) is 49;

    51 to 59;

    41,d) a distance (S1) between the mesial pit (13a) and the distal pit (13b) is 42 to 52% of the maximum width (W1) of the tooth (10),e1) a distance between the mesial pit (13a) and the buccal cusp tip (11) is 84 to 94% of the distance (S1) between the mesial pit (13a) and the distal pit (13(b),e2) a distance between the mesial pit (13a) and the lingual cusp tip (12) is 66 to 76% of the distance (S1) between the mesial pit (13a) and the distal pit (13b),f1) a distance between the distal pit (13b) and the buccal cusp tip (11) is 110 to 120% of the distance (S1) between the mesial pit (13a) and the distal pit (13b),f2) a distance between the distal pit (13b) and the lingual cusp tip (12) is 83 to 93% of the distance (S1) between the mesial pit (13a) and the distal pit (13b), andg) a distance between the buccal cusp tip (11) and the lingual cusp tip (12) is 88 to 98% of the distance (S1) between the mesial pit (13a) and the distal pit (13b); and

    an opposing artificial tooth of a maxillary first premolar tooth (50) having a buccal cusp tip (51), a lingual cusp tip (52), a mesial pit (53a), and a distal pit (53b), wherein,a) with the lingual cusp tip (52) being an origin of XYZ orthogonal coordinates of this tooth (50), an arrangement is determined such that (i) a line segment connecting between a point (M5a) for internally dividing a line segment connecting between the mesial pit (53a) and the distal pit (53b) by 47;

    53 and a point (M5b) for internally dividing a line segment connecting between the buccal cusp tip (51) and the lingual cusp tip (52) by 55;

    45 is parallel to the Z-axis, (ii) a line segment connecting between the mesial pit (53a) and the distal pit (53b) is parallel to the XZ plane of the XYZ orthogonal coordinates, and (iii) an X-coordinate value of the mesial pit (53a) is greater than an X-coordinate value of the distal pit (53b),b) a ratio of a distance, measured along the X-axis, from the lingual cusp tip (52) to a mesial surface (54a) of the tooth (50) which is at a maximum position of X-coordinate value of the tooth (50), to a distance, measured along the X-axis, from the lingual cusp tip (52) to a distal surface (54b) of the tooth (50) which is at a minimum position of X-coordinate value of the tooth (50) is 37;

    63 to 47;

    53,c) a ratio of a distance, measured along the Y-axis, from the lingual cusp tip (52) to a lingual surface (54d) of the tooth (50) which is at a minimum position of Y-coordinate value of the tooth (50), to a distance, measured along the Y-axis, from the lingual cusp tip (52) to a buccal surface (54c) of the tooth (50) which is at a maximum position of Y-coordinate value of the tooth (50) is 79;

    21 to 89;

    11,d) a distance (S5) between the mesial pit (53a) and the distal pit (53b) is 36 to 46% of a maximum width (W5) of the tooth (50),e1) a distance between the mesial pit (53a) and the buccal cusp tip (51) is 147 to 157% of the distance (S5) between the mesial pit (53a) and the distal pit (53b),e2) a distance between the mesial pit (53a) and the lingual cusp tip (52) is 98 to 108% of the distance (S5) between the mesial pit (53a) and the distal pit (53b),f1) a distance between the distal pit (53b) and the buccal cusp tip (51) is 134 to 144% of the distance (S5) between the mesial pit (53a) and the distal pit (53b),f2) a distance between the distal pit (53b) and the lingual cusp tip (52) is 119 to 129% of the distance (S5) between the mesial pit (53a) and the distal pit (53b), andg) a distance between the buccal cusp tip (51) and the lingual cusp tip (52) is 185 to 195% of the distance (S5) between the mesial pit (53a) and the distal pit (53b);

    wherein the following contacts are made at the same time,an occlusal surface surrounding the distal pit (13b) of the artificial tooth of the mandibular first premolar tooth (10) contacts, at least at one contact point, with an occlusal surface surrounding the lingual cusp tip (52) of the artificial tooth of the maxillary first premolar tooth (50), anda buccal cusp tip outer bevel surrounding the buccal cusp tip (11) of the artificial tooth of the mandibular first premolar tooth (10) contacts, at least at one contact point, with a buccal inner bevel of the occlusal surface surrounding the mesial pit (53a) of the artificial tooth of the maxillary first premolar tooth (50); and

    wherein the artificial tooth of the mandibular first premolar tooth (10) is implemented in a mandibular first premolar location within a complete mandibular denture, and the artificial tooth of the maxillary first premolar tooth (50) is implemented in a maxillary first premolar location within a complete maxillary denture.

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