The purpose of this study was to evaluate the amount and interrelationship of the soft tissue of nose and maxillary changes and to identify the nasal morphologic features that indicate susceptibility to nasal deflection in such a manner that they would be useful in presurgical prediction of nasal changes after maxillary advancement surgery in skeletal Class III malocclusion.
The sample consisted of 25 adult patients (13 males and 12 females) who had severe anteroposterior skeletal discrepancy. The patients had received presurgical orthodontic treatment. They underwent a Le Fort I advancement osteotomy, rigid internal fixation, alar cinch suture and V-Y advancement lip closure.
The presurgical and postsurgical lateral cephalograms and lateral and frontal facial photographs were evaluated. The computerized statistical analysis was carried out. Soft tissue of nose change to A point change ratios were calculated by regression equations.
The results were as follows
1. The correlation of maxillary hard tissue horizontal changes and nasal soft tissue vertical changes were high and the i3 o for soft tissue to ADV were 0.228 at ANt, 0.257 at SNt.
2. The correlation of maxillary hard tissue and nasal soft tissue horizontal changes were high and the 8 o for soft tissue to ADV were 0.484 at ANt, 0.431 at SNt, 0.806 at Sn.
3. The correlation of maxillary hard tissue horizontal changes and width changes of ala of nose were high and the Qo for alar base width ratio to ADV were 0.002.
4.. The DRI, Prominence of nose, Pre-Op CA is not a quantitative measure that can be used clinically to improve the predictability of vertical and horizontal nasal tip deflection.
In this study, increases in nasal tip projection and anterosuperior rotation occur when there is an anterior vector of maxillary movement These nasal changes were quantitatively correlated to magnitude of maxillary(A point) movement.
|