Fig. 1From: An expansion to the Nägerl’s theory of proportionality in reduced alveolar bone height models: a 3D finite element analysisUse the rules of trigonometric ratios for To obtain the Crot and Crest h = the distance between two nodes in the tooth long axis belong to both sides of the sign change ( ±) (= path of nodes) which is a known parameter. “a” and “b” are calculated displacements of the nodes both sides of the sign changeBack to article page