Table 1 Explanation the position of five levels
Level | abbreviation | Interpretation |
|---|---|---|
Level 1 | L1 | The level parallel to reference plane through the most distal protruding point of the crown of the mandibular second molars |
Level 2 | L2 | The level parallel to reference plane through the cement enamel-junction of the mandibular second molars |
Level 3 | L3 | The level parallel to reference plane through the root furcation of the mandibular second molars |
Level 4 | L4 | The level parallel to reference plane through the distal root of the mandibular second molars |
Level 5 | L5 | The level parallel to reference plane through the apex of the distal root of the mandibular second molars |