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. 2014 Sep 5;85(4):657–664. doi: 10.2319/060114-392.1

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Figure 3. Linear measurements: 1, vertical distance of maxillary central incisor root apex to horizontal reference line (HRL); 2, horizontal distance of maxillary central incisor root apex to vertical reference line (VRL); 3, vertical distance of maxillary central incisor crown to HRL; 4, horizontal distance of maxillary central incisor crown to VRL; 5, vertical distance of maxillary first molar root apex to HRL; 6, horizontal distance of maxillary first molar root apex to VRL; 7, vertical distance of maxillary first molar crown to HRL; 8, horizontal distance of maxillary first molar crown to VRL. — Linear measurements: 1, vertical distance of maxillary central incisor root apex to horizontal reference line (HRL); 2, horizontal distance of maxillary central incisor root apex to vertical reference line (VRL); 3, vertical distance of maxillary central incisor crown to HRL; 4, horizontal distance of maxillary central incisor crown to VRL; 5, vertical distance of maxillary first molar root apex to HRL; 6, horizontal distance of maxillary first molar root apex to VRL; 7, vertical distance of maxillary first molar crown to HRL; 8, horizontal distance of maxillary first molar crown to VRL.