Mandibular Morphology and Spatial Position following One-Stage Simultaneous Repair of Complete Unilateral Cleft Lip and Palate

Abstract

To assess mandibular structure and spatial position following one-stage simultaneous repair of the unilateral cleft lip and palate. Forty boys and 17 girls with complete unilateral cleft lip and palate who underwent one-stage simultaneous repair of the cleft by the same surgeon at the age of 9.23 months (standard deviation = 1.74) were selected. Lateral cephalograms taken at the age of approximately 10 years were analyzed and were compared with a sex- and age-matched control group that consisted of individuals with Angle Class I, no crossbite, positive overbite <5 mm, mild crowding (Incisor Irregularity Index <3.5 mm), and harmonious facial build. No intergroup differences were demonstrated regarding structure of the cranial base. The mandible was found to be retruded and at a larger inclination to the cranial base as compared with controls. Both total mandibular length (ArGn) and length of the mandibular body were larger in the control group, at <2 mm. Height of the ramus and gonial angle were similar in both groups. Intergender comparison showed few significant differences in control subjects only (SN, SGo, and NMe variables). The mandible, following a one-stage simultaneous repair of cleft, was found to be retrusive, and the length of mandibular body was <2 mm shorter than that of the controls.