The bilateral sagittal split ramus osteotomy (BSSO), on the other hand, is a widely used technique and has been an extensively described technique for mandibular retrusion
Mandibular retrusion may be the reason for increased soft tissue convexity for Turkish sample.
The mentolabial sulcus depth was significantly greater in Turkish adults than in the European-Americans; perhaps this might be attributed to mandibular retrusion.
The most common combinations are maxillary protrusion with normal mandible, mandibular retrusion
with normal maxilla, maxillary protrusion combined with mandibular retrusion
and posterior rotation of the mandible.
It was determined that the frequency ranges from 64% for mandibular retrusion
, 19% for maxillary protrusion and 17% for mixta.
Their data demonstrated that the pterygoid musculature plays a vital role in preventing passive mandibular retrusion and would thus aid in maintaining mandibular postural relationships with the maxillae and temporal bones.
Solow and Tallgren54 could determine through a cross study using cephalometry, that the extension of the head on the cervical spine is associated with a significant mandibular retrusion. Later, they confirmed this finding by longitudinal studies55,56 and found that the craniocervical extension correlates significantly with a facial growth pattern of vertical type.
The lateral cephalometric analysis indicated maxillary protrusion and minimum mandibular retrusion
--maxillary protrusion associated with mandibular retrusion
Therefore, an even higher suc- cess rate may have been achieved.15 Cephalometric measurements such as increase in mandibular plane to cranial base angle are related to poor response to OD treatment, whereas shorter soft palate length, increased cranial base angulation, minimal retroglossal airway, short anterior face height, and mandibular retrusion
have been related to successful OD treatment.
Class II malocclusion: mandibular retrusion
or maxillary protrusion?