Autorotation of the mandible as sequelae to maxillary intrusion: A systematic review

• Published in: Journal of pharmacy & bioallied science Vol. 13; no. 6; pp. 947 - 951
• Main Authors: Reddy, S, Ibrahim, Hisham, Bhardwaj, Shweta, Potdar, Suraj, Kumar, Akshay, Uppal, Ashish, Tiwari, Heena
• Format: Journal Article
• Language: English
• Published: India Wolters Kluwer India Pvt. Ltd 01-11-2021; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt. Ltd; Wolters Kluwer - Medknow; Wolters Kluwer Medknow Publications
• Subjects: autorotation; Complications; gummy smile; Jaw; Lip; Mandible; Maxilla; maxillary intrusion; Occlusion; Orthodontics; Review; vertical maxillary excess; Autorotation; vertical maxillary excess; maxillary intrusion; gummy smile
• ISSN: 0975-7406; 0976-4879; 0975-7406
• DOI: 10.4103/jpbs.jpbs_389_21

Background: Autorotation of the mandible is a normally anticipated phenomenon following a surgical superior repositioning of the maxilla in clinical situations where patients have an excessive gummy smile. Prediction of the surgical treatment outcome following a presurgical orthodontic treatment is a critical element in the surgical treatment planning. Materials and Methods: The relevant articles were selected by hand search and electronic media (Google Scholar, PubMed, Science Direct, Medline, Embase, and Cochrane) from 1982 to 2020. All the relevant articles were properly screened, and findings were extracted from the articles. Results: It was observed that, following maxillary intrusion, mandible would eventually autorotate to take a new occlusion. Mandibular autorotation as a result of maxillary intrusion would lead to minimal shortening of the lower lip in the vertical plane. It was observed that the amount of mandibular autorotation correlates with the extent of maxillary impaction. Studies have shown that there is a passive soft-tissue response which may be attributed to the fact that no muscular detachment had been affected in the lower lip and soft-tissue chin region during the maxillary surgery. Conclusion: It is observed that there is a definite influence on the mandibular and chin positions as a result of maxillary intrusion and autorotation of the mandible. Every 1 mm of maxillary superior impaction, the chin moved 0.6 mm vertically and 0.2 mm horizontally. There is an appreciable shortening of the lower lip length.