iDentistry The Journal Volume 14 No.1 | Page 22

The Journal Fig 10 : Post Treatment dental cast Discussion Severe facial asymmetries are obvious in general population. Evidence has been presented that in man the two sides of the face are not equal in size more so in the mandible3. Contrary to unilateral crossbite and bilateral crossbite it was found to have side-specific asymmetry. Skeletal components of the mandible have significant asymmetry among the crossbite groups The word symmetry is derived from the Greek word symmetria which means ‘of like measure’. Symmetry is defined as correspondence in size, shape and relative position of parts on opposite sides of a dividing line or median 21 plane. Asymmetry is described as a lack or absence of symmetry5. When applying this to the human face, it illustrates an imbalance or disproportionality between the right and left sides. A degree of asymmetry is normal and acceptable in the average face. It may be caused by a range of factors that affect the underlying skeletal structure or soft tissue drape. Severt and Proffit demonstrated a hierarchy of stability for orthognathic procedures performed to correct severe facial asymmetries. Long- term stability of BSSO appears to depend on successfully controlling the position of the proximal condylar segments and maintaining the mandibular ramus inclination.A compensated dentition is often found in patients with a unilateral posterior crossbite6 Vol. 14 No. 1 Jan-Apr 2018