it is suggested that tooth wear converts the plane of occlusion present in little-worn teeth , the monson curve , into a helicoidal plane when 1 ) the diet is more abrasive , 2 ) the enamel is thinner and less abrasion resistant , and 3 ) a longer time separates the eruption of the three molar teeth in a jaw quadrant .
C0040426
teeth
C0011350
enamel