RESUMO
<p><b>OBJECTIVE</b>To analyze the clinical results and complications of three methods for microgenia, including chin augmentation with silicone implant, bone autograft, and genioplasty.</p><p><b>METHODS</b>The advantages and disadvantages of the three methods for microgenia were assessed through 3-D CT reconstruction, X-ray and intraoperative observation during the second operation. The indications for each technique were also studied.</p><p><b>RESULTS</b>The frequently observed problems for chin augmentation with silicone implants were implant malposition, underlying bone absorption, periosteal reaction and undercorrection. Chin augmentation with bone autograft had a great long-term bone graft absorption which led to undercorrection. Genioplasty showed a satisfactory cosmetic result with no serious complication.</p><p><b>CONCLUSIONS</b>Chin augmentation with silicone implant is suitable for mild microgenia with a shallow mentolabial groove, but without facial vertical insufficient and facial asymmetry. Genioplasty can be used in all kinds of microgenia in any severity, especially those with deviated chin and facial asymmetry. Chin augmentation with bone autograft can't achieve good long-term result and should be applied prudently.</p>