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Systematic review of changes in maxillary incisor exposure and upper lip position with Le Fort I type osteotomies with or without cinch sutures and/or VY closures
Affiliation:1. State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China;2. Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA;3. Center of Orthognathic and Temporomandibular Joint Surgery, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China;1. Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Taipei, Taiwan;2. Craniofacial Research Centre, Chang Gung Memorial Hospital, Linkou, Taiwan;3. Graduate Institute of Craniofacial and Oral Science, Chang Gung University, Taoyuan, Taiwan;4. Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan;1. Department of Plastic and Reconstructive Surgery, Yale University School of Medicine, New Haven, CT 06520, USA;2. Dental Section, Panyananthaphikkhu Chonprathan Medical Center, Srinakharinwirot University, Nonthaburi, Thailand;1. Assistant Professor, Oral and Maxillofacial Surgery, Harvard School of Dental Medicine, Massachusetts General Hospital, Boston, MA;2. Resident, Department of Plastic and Reconstructive Surgery, Johns Hopkins Hospital, Johns Hopkins Medical School, Baltimore, MD
Abstract:The aim was to systematically review the maxillary incisor exposure and upper lip position changes with Le Fort I type osteotomies for advancement ± impaction with rigid internal fixation, taking into account the use of cinch sutures and VY closures. Electronic databases (Cochrane Library, Medline, Embase, and Web of Science) were searched using medical subject headings (MeSH), key words, truncations, and Boolean operators. Hand searching was also undertaken. Of 979 articles identified, 15 were included (11 retrospective, two prospective, and two unspecified). Relevant study details and outcomes were recorded on a spreadsheet, along with an assessment of their quality. In total, these studies assessed 419 patients (266 female, 118 male) with a mean age of 26.4 years (range 14–57 years). Soft tissue changes were assessed on lateral cephalometric radiographs. The mean maxillary hard tissue advancement and impaction ranged between 0.94 and 8.77 mm and −0.56 and 4.2 mm, respectively. The ranges of ratios demonstrated that from pronasale (0.24–0.35) to labrale superius (0.36–1.43), the soft tissues followed the underlying horizontal hard tissue movement increasingly more closely. Alar base cinch sutures and VY closures tended to increase these ratios. The soft tissue response was more variable vertically. None of the studies reported on maxillary incisor exposure change. More good quality prospective studies are needed.
Keywords:maxillary incisor exposure  Le Fort I osteotomy  orthognathic surgery  cinch suture  VY closure
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