J Korean Assoc Maxillofac Plast Reconstr Surg.  2005 May;27(3):226-237.

Fabrication of myomucosal flap using cultured oral epithelium in rabbit model

Affiliations
  • 1Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Seoul National University and Dental Research Institute, Korea. leejongh@plaza.snu.ac.kr
  • 2Department of Pediatrics, Chung-Ju Medical Hospital, Kon-Kuk University, Korea.
  • 3Department of Oral and Maxillofacial surgery, School of Dentistry, Kangnung National University, Korea.
  • 4Department of Pharmacology, Yonsei Medical University, Korea.
  • 5Bioland R and D center, Korea.
  • 6Department of Pathology, Medical School, Chungang University, Korea.

Abstract

PURPOSE: Extensive defect of oral and maxillofacial area is usually reconstructed with composite flap including skin paddle. However, if the defects are lined with only skin components, the mucosa's role in mastication and texture are not restored. Furthermore, stiffness and hair-growing prevent denture rehabilitation and good oral hygiene. This study was performed to overcome the disadvantages of composite soft tissue flaps including the skin and to make a model for myo-mucosal flaps.
MATERIALS AND METHODS
Buccal mucosa sized 0.5 x 1.0 cm2 from New Zealand rabbit (around 1.5kg) was harvested and cultivated by the modification of Rheinwald and Green's keratinocyte culture method. Cultured mucosa was grafted on the fascia of latismus dorsi as form of mucosal sheet. After 7, 10, 14 days, the myomucosal flap was excised and evaluated under light microscope with H and E and immunohistochemical staining. As control group, harvested buccal mucosa from rabbit was transplanted to gracilis muscle (n=6).
RESULTS
From 7 days after prelamination, the basal layer of the grafted mucosa resembled that of normal mucosa. As control group, transplanted mucosa had original shape but there's slight inflammatory reaction. Prelaminated mucosa has 19.8 +/- 4.59 cell layers and some samples have more than 20 layers. The expression rate of PCNA was relatively strong (42.9% +/- 14.1) at the basal layer of grafted mucosa and the laminin was found at the basal layer. On the contrary, prelaminated mucosa at 10 days showed moderate expression rate of PCNA (32.4% +/- 4.62). We found the mucosal layer was somehow disappeared and there is strong inflammatory reaction. After 14 days prelamination, the grafted oral keratinocytes were almost disappeared and expression of PCNA was not observed.
CONCLUSION
We can make 75 fold large mucosal (3850mm2) sheet from small samples of mucosa (50mm2). Epithelial sheet that grafted on the fascia of muscle underwent differentiation and proliferation. But after 10, 14 days, there was strong inflammatory reaction and the grafted mucosa was destroyed from surface layer. In rabbit model, transfer of fascio-mucosal flap should be done from 7 to 10 days after prelamination.

Keyword

Myo-mucosal flap; Cultured mucosa; Oral keratinocyte; Tissue-engineering; Prelamination; Rabbit model

MeSH Terms

Dentures
Epithelium*
Fascia
Keratinocytes
Laminin
Mastication
Mouth Mucosa
Mucous Membrane
Oral Hygiene
Proliferating Cell Nuclear Antigen
Rabbits
Rehabilitation
Skin
Transplants
Laminin
Proliferating Cell Nuclear Antigen
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