Tooth replacement

Abstract

The invention relates to a tooth replacement comprising at least one posterior tooth having a mesial contact surface, a distal contact surface, and an occlusal surface. The occlusal surfaces comprises a least one buccal cusp having a buccal cusp tip, a lingual cusp having a lingual cusp tip, a central fissure which has at least one tooth pit and passes through the occlusal surface in the mesiodistal direction between the two cusps, a first gradient which slopes downward from the buccal cusp tip in the direction of the central fissure, and a second gradient which slopes downward from the lingual cusp tip in the direction of the central fissure. The tooth replacement according to the invention is characterized in that the mesial contact surface, the distal contact surface and/or the occlusal contact surface comprise expansion spaces that have been incorporated in a targeted manner to obtain a dynamic occlusal guidance.

1 . A tooth replacement comprising at least one posterior tooth having a mesial contact surface, a distal contact surface, and an occlusal surface, wherein the occlusal surface comprises a least one buccal cusp having a buccal cusp tip, a lingual cusp having a lingual cusp tip, a central fissure which has at least one tooth pit and passes through the occlusal surface in a mesiodistal direction between the two cusps, a first gradient which slopes downward from the buccal cusp tip in a direction of the central fissure, and a second gradient which slopes downward from the lingual cusp tip in the direction of the central fissure, characterized in that the mesial contact surface, the distal contact surface or the occlusal contact surface comprise expansion spaces that have been incorporated in a targeted manner to obtain a dynamic occlusal guidance. 
     
     
         2 . The tooth replacement according to  claim 1 , characterized in that the expansion spaces are implemented as profilings extending in a normal direction to a tangent plane of the distal contact surface, the mesial contact surface or the occlusal surface. 
     
     
         3 . The tooth replacement according to  claim 1 , characterized in that in a frontal plane passing through the central fissure the radius of curvature of the occlusal surface at the base of the central fissure is greater than one quarter of a distance between the two cusp tips, resulting in a smooth transition between the first gradient, the central fissure and the second gradient. 
     
     
         4 . The tooth replacement according to  claim 3 , characterized in that in sectional planes running parallel to a tooth axis through by a base of the tooth pit the radius of curvature of the occlusal surface at the base of the tooth pit greater than 1.2 mm and less than 4-5 mm. 
     
     
         5 . The tooth replacement according to  claim 1 , characterized in that the occlusal surface is continuously concavely curved in a frontal plane passing through the cusps starting from the first gradient through the central fissure to the second gradient. 
     
     
         6 . The tooth replacement according to  claim 1 , characterized in that in all frontal planes passing through the central fissure, the maximum slope angle of the first or of the second gradient with respect to a transverse plane is less than 40°, and more than 20°. 
     
     
         7 . The tooth replacement according to  claim 1 , characterized in that in all frontal planes passing through the central fissure, a distance between the base of the central fissure and the transverse plane passing through the highest cusp tip is greater than 0.3 mm and smaller than 1.5 mm. 
     
     
         8 . The tooth replacement according to  claim 1 , characterized in that a distance between the two cusp tips is more than 4 times and less than 15 times, than a distance between a transverse plane passing through the base of the tooth pit and a transverse plane passing through the highest cusp. 
     
     
         9 . The tooth replacement according to  claim 1 , characterized in that in a frontal plane passing through the base of the tooth pit the radius of curvature of the occlusal surface increases at least section-wise starting from a base of the tooth pit in a direction towards an edge of the tooth pit. 
     
     
         10 . The tooth replacement according to  claim 1 , characterized by an antagonist of the posterior tooth having a further occlusal surface having at least one further cusp, which engages in an occlusion position with the tooth pit of the occlusal surface of the posterior tooth, wherein the length of the retrusion path starting from the occlusion position is at least 0.6 mm to 0.8 mm or the length of the protrusion path is 0.4 mm to 0.6 mm. 
     
     
         11 . The tooth replacement according to  claim 10 , characterized in that in the occlusion position the cusp of antagonist contacts the occlusal surface of the posterior tooth in the area of the tooth pit in a planar manner, wherein the contact surface is more than 0.5 mm 2  and less than 3 mm 2 . 
     
     
         12 . The tooth replacement according to  claim 1 , characterized in that the distal or the mesial contact surface is curved in a calotte-like or spherical manner, having a convex edge both in a sagittal plane and in a transverse plane. 
     
     
         13 . The tooth replacement according to  claim 12  with an adjacent tooth of the posterior tooth having a further mesial or distal contact surface abutting the distal (mesial) contact surface of the posterior tooth, wherein the further mesial or distal contact surface of the adjacent tooth is curved concavely spherically for producing a form-fit contact with the convexly curved distal or mesial contact surface of the posterior tooth respectively, having a concave edge both in a sagittal plane and in a transverse plane. 
     
     
         14 . The tooth replacement according to  claim 13 , characterized in that the radius of curvature of the convexly curved contact surface of the posterior tooth corresponds approximately to the radius of curvature of the concavely curved further contact surface of the adjacent tooth. 
     
     
         15 . The tooth replacement according to  claim 1 , characterized in that a tooth neck of the posterior tooth is offset such between a tooth crown and a tooth root a recessed shoulder is formed, said shoulder revolving around a periphery of the posterior tooth. 
     
     
         16 . The tooth replacement according to  claim 1 , comprising at least two adjacently arranged teeth, especially molars or premolars, of which one having a mesial contact surface that is contactable with a distal contact surface of another tooth, characterized in that the mesial or distal contact surface is curved convexly in a calotte-like or spherical manner, having a convex edge in a sagittal plane and in a transverse plane, and the distal or mesial contact surface is curved concavely spherically for producing a form-fit contact with the convexly curved contact surface, having a concave edge in a sagittal plane and in a transverse plane. 
     
     
         17 . The tooth replacement according to  claim 16 , characterized in that the radius of curvature of the convexly curved contact surface corresponds approximately to the radius of curvature of the concavely curved contact surface. 
     
     
         18 . The tooth replacement according to  claim 1 , characterized in that the tooth neck of at least one tooth is offset such that between a tooth crown and a tooth root a recessed shoulder is formed. 
     
     
         19 . The tooth replacement according to  claim 18 , characterized in that the shoulder is implemented revolving around a periphery of the tooth. 
     
     
         20 . The tooth replacement according to  claim 1 , characterized by an antagonist to one of the teeth, wherein the length of a retrusion path from the tooth pit is 0.6 mm to 0.8 mm or the length of a protrusion path from a neuronal contact position is 0.4 mm to 0.6 mm.