上颌骨缺损的Brown分类法

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Brown classification system

Brown classification system includs 6 vertical classes (I-VI) and 4 horizontal classes (a-d)1.

Brown classification

6 vertical classes:

  • “class I” vertical defect involves the alveolar bone not causing an oronasal fistula;
  • “class II” involves the alveolus and antral walls but not including the orbital floor or rim;
  • “class III” involves the orbital adnexa with orbital retention;
  • “class IV” is with orbital enucleation or exenteration;
  • “class V” is an orbitomaxillary defect;
  • and “class VI” is a nasomaxillary defect.

4 horizontal classes

  • A “class a” horizontal defect is a palatal defect only, not involving the dental alveolus;
  • “class b” is a defect less than or equal to half of the unilateral palate;
  • “class c” is less than or equal to half of the bilateral or transverse anterior palate;
  • and “class d” is greater than half of the palate.

Brown Classification-guided approach to midface reconstruction

A defect-based approach to midface reconstruction based on the Brown Classification2.

Brown-classification-base-reconstruction-approaches

ALT, anterolateral thigh; CUD, complete upper denture; DCIA, deep circumflex iliac artery; FAMM, facial artery musculomucosal; LD, latissimus dorsi myocutaneous or myofascial flap; OC-RFFF, osteocutaneous radial forearm free flap; RPD, removable partial denture; ST, soft tissue; VBF, vascularized bone flap.

  1. Brown JS, Shaw RJ. Reconstruction of the maxilla and midface: introducing a new classification. Lancet Oncol. 2010 Oct;11(10):1001-8. doi: 10.1016/S1470-2045(10)70113-3. PMID: 20932492. ↩

  2. Classification of the Midface Defect. Gigliotti, Jordan et al. Atlas of the Oral and Maxillofacial Surgery Clinics of North America, Volume 32, Issue 2, 73 – 80 ↩

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