| Abstrakt: |
Objective: This retrospective study aimed to evaluate inferior scleral exposure changes in Class III patients that underwent orthognathic surgery with Le Fort I osteotomy with and without vertical displacement. Materials and Methods: Preoperative and 6 months postoperative cephalograms and stereophotogrammetric images of 45 subjects (mean age: 21.66 ± 2.97 years) who underwent orthognathic surgery for Class III correction were retrieved. Subjects were divided into 3 groups: maxillary advancement‐only (AO), maxillary advancement + impaction (AI) and maxillary advancement + downfracture (AD). Exclusion criteria were mandibular‐only surgery, occlusal canting, facial asymmetry, orbital surgery and craniofacial syndrome. One investigator measured inferior scleral exposure on both sides using following landmarks: upper eyelid margin (A), inferior limbus (B) and lower eyelid margin (C). Distance between A and C was recorded as overall eye height (E), and distance between B and C was recorded as inferior sclera exposure (S). S:E ratio in percentage was calculated to standardize sclera exposure relative to overall eye height. Wilcoxon signed‐rank and Kruskal‐Wallis tests were used for statistical analysis (P <.05). Results: Mean value of maxillary movements was as follows: 4.21 ± 1.82 mm advancement in AO, 5.08 ± 2.18 mm advancement and 2.33 ± 0.99 mm impaction in AI, 3.95 ± 1.45 mm advancement and 3.1 ± 0.71 mm downfracture in AD. Change in reduction of scleral exposure was significant in all groups (P <.05). AI group bilaterally and AO group right side had highest differences (−4.96 ± 4.86, −6.09 ± 4.21, −4.99 ± 3.23, respectively). There was no significant difference between groups in S:E ratio changes (P >.05). Conclusion: Intergroup comparisons showed no statistically significant difference, revealing similar reduction in all three groups despite the differences in the vertical movement variable. [ABSTRACT FROM AUTHOR] |
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