17 恆齒列的犬齒與門齒之形態差異,下列敘述何者錯誤?(A)近遠心齒頸線彎曲深度:犬齒小於正中門齒(B)皆有切緣結節(mamelon)(C)皆有唇面發育凹陷(labial developmental depression)(D)皆有舌面隆突(cingulum)