|3205 Five Year Hard to Soft Tissue Correlations Following BSSO|
C. DOLCE1, J. HATCH2, J.E. VAN SICKELS3, and J. RUGH2, 1University of Florida, Gainsville, USA, 2University of Texas Health Science Center, San Antonio, USA, 3University of Kentucky, Lexington, USA|
The aim of this study was to examine the correlations between changes in soft and hard tissue in a cohort of subjects who underwent a bilateral sagittal split osteotomy (BSSO) for mandibular advancement. The subjects in this study were enrolled in a multisite prospective randomized clinical trial which were randomized to receive wire or rigid fixation following (BSSO). Subjects in the rigid group (n=57) received 2 mm bicortical position screws, while the wire subjects (n=33) received inferior border wires and six weeks of skeletal intermaxillary fixation with 24 gauge wires. Additionally, some patients received a genioplasty in both the rigid (n=29) and wire groups (n=18). Soft and hard tissue profile changes were obtained from cephalometric films immediately pre-surgery and at various time points up to five years post-surgery. Soft and hard tissue profile changes were referenced to a cranial base X-Y coordinate system. Horizontal changes in mandibular incisor (L1) and lower lip (LLIP), B-point (B-pt) and soft tissue B-point (STB-pt), Pogonion (Pog) and soft tissue pogonion (STPog) were calculated at each time point by subtracting the pre-surgery value from subsequent time period. Then bivariate correlations between the hard and soft tissue changes for each time period were calculated. Five years post-surgery the following hard to soft tissue correlations were found.
Strong correlations (p<0.001) were found between Pog and STPog at all time points and in all groups. Other correlations were modest. Supported by NIH/NIDR grants DE09630 and 07283.
|Seq #296 - Orthognathic Surgery|
9:00 AM-11:00 AM, Saturday, 9 March 2002 San Diego Convention Center Room 12 (Mezzanine Level)