J Korean Assoc Maxillofac Plast Reconstr Surg.  2001 Jan;23(1):21-30.

Skeletal relapse pattern after sagittal split ramus osteotomy of mandibular prognathic patient

• Ryu KW
• Shin WC
• Kim JG

Abstract

The purpose of this study was to evaluate the skeletal relapse pattern of the mandibular prognathic patients after mandibular set back surgery by sagittal split ramus osteotomy. The horizontal and vertical position of the cephalometric points were measured before, after surgery and after one-year follow up period. The next, the positional change of the proximal and distal mandibular segment were evaluated respectively. The obtained results were as follows; 1. The horizontal and vertical position of Cd was not changed before and after surgery, and it was maintained its original position during the observation periods. 2. As the mandibular prognathism of the patients was severe before surgery, the more skeletal relapse tendency was observed during follow-up period (p<0.05). 3. As the horizontal positional change of the mandible which was obtained by mandibular set-back surgery was large, the more horizontal relapse tendency was observed during follow-up period (p<0.05). 4. The corpus axis angle decreased by sagittal split ramus osteotomy (p<0.01), but it was kept its reoriented position during follow-up period. 5. During the follow-up period after mandibular set-back by sagittal split ramus osteotomy, the forward relapse of mandible correlated with not only the forward rotation of the proximal segment but also the forward movement of the distal segment (p<0.05).

Keyword

Mandibular prognathism; Skeletal relapse; Sagittal split ramus osteotomy; Proximal segment; Distal segment

MeSH Terms

Axis, Cervical Vertebra
Follow-Up Studies
Humans
Mandible
Osteotomy, Sagittal Split Ramus*
Prognathism
Recurrence*