Background: The aim of this report is to present a new reference for aesthetic mandible surgery using\nthree-dimensional cone-beam computed tomography-based treatment planning for orthognathic surgery which\ncan be implemented in surgical planning and perioperative procedure.\nMethods: To make an objective standard for evaluating aesthetic mandibular outline, we make an aesthetic scoring\ncriteria with consideration of asymmetry, broad mandibular border line, and prominent mandibular angle. Two\nmaxillofacial surgeons and two orthodontists rated their aesthetical evaluation from 1 to 5. Experimental group\nconsisting of 47 female and 38 male patients who had rotational orthognathic two-jaw surgery from 2010 to 2011\nwere chosen according to aesthetic scoring done by two maxillofacial surgeons and two orthodontists. A high\naesthetic score (â�¥16) means the facial contour is symmetric, with no broad and narrow aesthetic mandible frontal\nprofiles. Control A group consisted of ten female and ten male patients who had no orthognathic surgery\nexperience and low aesthetic score (â�¤10). Control B group consisted of ten female and ten male patients who had no\northognathic surgery experience and had anaesthetic mandibular frontal profile and a high aesthetic score (â�¥16). The\nthree-dimensional image of the patient was taken from dental cone-beam CT (DCT) scanning (experimental group and\ncontrol A group: 6 months DCT after surgery, control B group: 1st visit DCT). Each DCT was reformatted to reorient the\n3D image using 3D analyzing program (OnDemand3D, cybermed Inc, CA, USA). After selection of 12 landmarks and\nthe construction of reoriented horizontal, vertical, and coronal reference lines, 15 measurements were taken in 3D\nanalysis of frontal mandibular morphology. Afterwards, horizontal and vertical linear measurements and angular\nmeasurements, linear ratio were obtained.\nResults: Mean Goâ��Rt-Meâ��-Goâ��Lt angular measurement was 100.74 �± 2.14 in female patients and 105.37 �± 3.62 in male\npatients. These showed significant difference with control A group in both genders. Ratio of Goâ��Rt,Goâ��Lt-Meâ�� length to\nsome linear measurements (ratio of Meâ��-Cdâ��RtCdâ��Lt to Meâ��-Goâ��RtGoâ��Lt, ratio of Meâ��-Goâ�� to Meâ��-Goâ��RtGoâ��Lt, ratio of Goâ��Rt-Goâ��Lt\nto Meâ��-Goâ��RtGoâ��Lt) showed significant difference with control A group in both genders.\nConclusion: This study was intended to find some standard measurement of mandible frontal view in 3D analysis of\naesthetic patient. So, these potential measurement value may be helpful for orthognathic treatment planning to have\nmore aesthetic and perspective outcomes.
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