Research Article
Correlation between the Rotation of the First Molars and the
Severity of Class II Division 1 Malocclusion
Table 1
Points, lines, and angles used to evaluate molar rotation.
| ā | Definition |
| Points | RP1 | Most anterior region of the palatine raphe | RP2 | Most posterior region of the palatine raphe | MV | Tip of the mesiobuccal cusp of the maxillary first molar | DV | Tip of the distobuccal cusp of the maxillary first molar | MP | Tip of the mesiopalatal cusp of the maxillary first molar | C | Tip of the cusp of the maxillary canine |
| Lines | Line MV-DV | Connection between points MV and DV | Line RP1-RP2 | Connection between points RP1 and RP2 | Line DV-MP | Connection between points DV and MP (line of Ricketts) |
| Angles | Angle of Henry | Angle formed between MV-DV and RP1-RP2 lines | Angle of Friel | Angle formed between the palatine raphe and the MP-MV line |
|
|