- groove between the Buccal and lingual cusps of the posterior teeth
-the lingual cusps of the maxillary arch are longer then the buccal cusps and vice versa for the mandibular arch
When a line connects the buccal and lingual cusps of the same type of molar and premolars on opposite sides of the arch. The mediolateral curve of the maxillary is convex while the mandibular is concave.
Root Axis Line
- imaginary line through the center of the tooth root. Helps to define the location of anatomic landmarks
-the mandibular Incisal ridge is more likely to be lingual to the root axis line while the maxillary incisors are more likely to be labial to the root axis line
Height of Contour
- greatest amount of a curve, or greatest convexity or bulge, farthest from the root axis line. Tangential.
-crest of curvature is usually easiest to see mesially or distally. The farthest point from the midline from the side aspect.
-Used to determine the direction of food in the mouth
- the greatest heights of contour on the proximal surfaces of tooth crowns. AKA the mesial/distal heights of contour. Located in the incisal/occlusal third, medial third, or between.
- space between adjacent teeth that don't contact each other
-the enamel of teeth gradually wears away so on older patients you have to be more careful on how deep you drill
- the spaces that surround each contact area
-divided into buccal embrasure, lingual embrasure, occlusal/Incisal embrasure, the last is called the interproximal space (cervical to the contact area)
- triangular embrasure space between adjacent teeth, cervical to the contact area. Occupied by the interdental papilla in periodontally healthy people