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.

Variable

Rigid + Genio

Rigid Genio

Wire + Genio

Wire - Genio

L1 : LLIP

0.52

0.80

0.70

0.87

B-pt : STB-pt

0.86

0.97

0.77

0.96

Pog : STPog

0.95

0.92

0.92

0.94

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)

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