The etiology and prediction of mandibular third molar impaction.

摘要: 1. Skeletal Class II dental base relationship with a shorter, narrower, more acute angled madible was found in association impacted third molars, compared erupted teeth. 2. These differences were at age 18+ years but less obvious 10 to 11 years. 3. There reduced amount of mandibular growth molar cases. 4. slight tendency for molars be larger than those which erupted. 5. The presence space between second and the early stages development is not an indication that will erupt. 6. developmental angulation plane higher group. 7. Accurate prediction impaction from radiographic measurements possible