BACKGROUND: This study evaluated the changes in the chin profile after using mandibular setback and vertical chin reduction genioplasty to correct mandibular prognathism associated with a long and flat chin. METHODS: Sixteen consecutive patients (6 male and 10 female) underwent surgery at a mean age of 22.6 years (range = 18.2-27.8 years). The evaluation consisted of hard and soft tissue analysis before and after treatment. RESULTS: The results showed that improvement in facial profile, chin contour, and dental occlusion was achieved. After an average of 9.4-mm mandibular setback and 5.1-mm vertical osseous chin reduction, the thickness of soft tissue pogonion was increased by 4.0 mm, the supramentale thickness was increased by 1.8 mm, and lower-lip thickness was increased by 1.6 mm. Thus, the mentolabial fold increased from 3.4 to 4.7 mm and the mentolabial angle decreased from 153.4 to 136.9°. The vertical lip:chin ratio became normal. CONCLUSION: The results of this study demonstrated that mandibular setback combined with vertical chin reduction genioplasty offers an alternative for the treatment of patients suffering from mandibular prognathism with a long, nonprojecting chin. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article.
BACKGROUND: This study evaluated the changes in the chin profile after using mandibular setback and vertical chin reduction genioplasty to correct mandibular prognathism associated with a long and flat chin. METHODS: Sixteen consecutive patients (6 male and 10 female) underwent surgery at a mean age of 22.6 years (range = 18.2-27.8 years). The evaluation consisted of hard and soft tissue analysis before and after treatment. RESULTS: The results showed that improvement in facial profile, chin contour, and dental occlusion was achieved. After an average of 9.4-mm mandibular setback and 5.1-mm vertical osseous chin reduction, the thickness of soft tissue pogonion was increased by 4.0 mm, the supramentale thickness was increased by 1.8 mm, and lower-lip thickness was increased by 1.6 mm. Thus, the mentolabial fold increased from 3.4 to 4.7 mm and the mentolabial angle decreased from 153.4 to 136.9°. The vertical lip:chin ratio became normal. CONCLUSION: The results of this study demonstrated that mandibular setback combined with vertical chin reduction genioplasty offers an alternative for the treatment of patients suffering from mandibular prognathism with a long, nonprojecting chin. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article.
Authors: Stephan Christian Möhlhenrich; Florian Kötter; Florian Peters; Kristian Kniha; Sachin Chhatwani; Gholamreza Danesh; Frank Hölzle; Ali Modabber Journal: Head Face Med Date: 2021-04-14 Impact factor: 2.151