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| L (landmark) | Definition |
|
| L1 | Farthest point of right mandible basal bone |
| L2-L3 | Buccal retromolar space of right mandible basal bone |
| L4-L6 | The buccal point of second molar and buccal midpoint of second molar and first molar in right mandible basal bone |
| L7-L9 | The buccal point of first molar and buccal midpoint of first molar and second premolar in right mandible basal bone |
| L10-L11 | The buccal point of second premolar and buccal midpoint of second premolar and first premolar in right mandible basal bone |
| L12-L13 | The buccal contact point of first premolar and buccal midpoint of first premolar and canine in right mandible basal bone |
| L14-L18 | The buccal point from canine to central incisor in right mandible basal bone |
| L19 | The buccal forefront point of mandible basal bone |
| L20-L24 | The buccal point from central incisor to canine in left mandible basal bone |
| L25-L28 | The buccal midpoint of canine and first premolar and buccal point of second premolar in left mandibular basal bone |
| L29-L31 | The buccal midpoint of second premolar and first molar and buccal point of first molar in left mandibular basal bone |
| L32-L34 | The buccal midpoint of first molar and second molar and buccal point of second molar in left mandibular basal bone |
| L35-L36 | Buccal retromolar space of left mandibular basal bone |
| L37 | Farthest point of left mandibular basal bone |
| L38-L39 | Lingual retromolar space of left mandibular basal bone |
| L40-L42 | The lingual point of second molar and lingual midpoint of second molar and first molar in left mandibular basal bone |
| L43-L45 | The lingual point of first molar and lingual midpoint of first molar and second premolar in left mandibular basal bone |
| L46-L49 | The lingual point of second premolar and lingual midpoint of first premolar and canine in left mandibular basal bone |
| L50-L54 | The lingual point from canine to central incisor in left mandibular basal bone |
| L55 | The lingual forefront point of mandibular basal bone |
| L56-L60 | The lingual point from central incisor to canine in right mandibular basal bone |
| L61-L64 | The lingual midpoint of canine and first premolar and lingual point of second premolar in right mandibular basal bone |
| L65-L67 | The lingual midpoint of second premolar and first molar and lingual point of first molar in right mandibular basal bone |
| L68-L70 | The lingual midpoint of first molar and second molar and lingual point of second molar in right mandibular basal bone |
| L71-L72 | Lingual retromolar space of right mandibular basal bone |
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