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Chapter 10178in the OHIP-14 scores in the first week, and a further gradually lowering in the postoperative months. By 1 year, the OHRQoL had improved significantly. The duration of the surgery did influence the OHIP-14 outcome negatively in the first postoperative week, meaning that a longer operation time resulted in temporarily higher OHIP-14 scores compared with those of shorter operation times. Regarding the OHRQoL scores, we found the results involving facial appearance to be more important than those involving oral function. The indication for surgery, Class II or III malocclusion, had no influence on the outcomes.