Comparative study of stability between two different fixation systems after orthognathic surgery in mandibular prognathism skeleton

Objective: This study is intended to compare the skeleton stability of bioabsorbable and titanium systems after orthognathic surgery in mandibular prognathism patients. Study design: A Retrospective study of 28 mandibular prognathism patients who underwent BSSRO setback surgery at Chulalongkorn University. Both titanium and the bioabsorbable group would take lateral cephalo-metrics immediately postoperative in 1-week(T0), 3(T1), 6(T2), and 12(T3) months. These radiographs were analyzed with Dolphin imaging programTM. The vertical, horizontal, and angular indices were measured. To compare immediately postoperative and follow-up periods within the group, the Friedman difference was used, and the Man-Whitney U test was used between the two groups. Result: The measurements within the group presented no statistically significant differences. But this study showed that at T0-T1, there was a statistically significant difference between the two groups in the mean of Me in horizontal linear measurement. T0-T2 found differences between Me in both horizontal and vertical linear measurements, and the difference between ANB. The differences between B-point, Pog, and Me in ver-tical linear measurements at T0-T3 were also reported. Conclusion: The significant difference values were within the normal range which indicated that using the bioabsorbable system could be well maintained as well as the titanium system. Statement of clinical relevance: The second operation for removing titanium plate and screw after conven-tional orthognathic surgery may leads patient discomforts. While a resorbable system might be the role change if the stability is place on the same level. & COPY; 2023 Elsevier Masson SAS. All rights reserved.