The effects of surgically assisted rapid maxillary expansion (SARME) on the dental show and chin projection. Issue 11 (November 2017)

• Record Type: Journal Article
• Authors: Xi, Tong; Laskowska, Magdalena; van de Voort, Neeltje; Ghaeminia, Hossein; Pawlak, Wojciech; Bergé, Stefaan; Maal, Thomas
• Is Part Of: Journal of cranio-maxillofacial surgery. Volume 45:Issue 11(2017)
• Page Start: 1835
• Page End: 1841
• Publication Date: 2017-11
• Subjects: 3D -- CBCT -- Chin -- Dental show -- Maxillary expansion -- SARME; Skull -- Surgery -- Periodicals; Maxilla -- Surgery -- Periodicals; Face -- Surgery -- Periodicals; Surgery, Plastic -- Periodicals; Maxilla -- surgery -- Periodicals; Face -- surgery -- Periodicals; Skull -- surgery -- Periodicals; Oral Surgical Procedures -- Periodicals; Reconstructive Surgical Procedures -- Periodicals; Surgery, Plastic -- Periodicals; Surgery, Oral -- Periodicals; Electronic journals; 617.514
• DOI: 10.1016/j.jcms.2017.08.023
• Languages: English
• ISSNs: 1010-5182

Abstract

Abstract: Objective: To quantify the postoperative changes of the dental show and chin projection following SARME using 3D CBCT imaging. Material and methods: 78 patients with transversal maxillary hypoplasia and mandibular hypoplasia who underwent SARME were enrolled into the study. A cone beam computed tomography (CBCT) scan was acquired preoperatively and at least 1 year postoperatively. 3D postoperative changes in the dental show and pogonion position were measured based on soft tissue and hard tissue landmarks. Results: 68 patients (87%) exhibited a postoperative increase in the dental show. The dental show was increased by a mean of 2.2 ± 2.0 mm (p < 0.01). The mean horizontal and vertical displacement of the chin (pogonion) following SARME was 1.6 ± 2.5 mm posteriorly and 1.6 ± 2.0 mm inferiorly (p < 0.01). An inferior displacement of the maxilla and maxillary tooth as well as a consequent clockwise pitch of the mandible seemed to play a role in inducing these postoperative changes. Conclusion: An increase in dental show and a posterior and inferior displacement of the chin should be considered prior to SARME to prevent undesirable postoperative changes of the facial esthetics.