title: Antiadhesive effect of bioresorbable polylactide film in abraded middle ear mucosa.
abstract: OBJECTIVE
  Polylactide film (PLF) is used to prevent postoperative peridural adhesion in spinal surgery. Up until now, the antiadhesive effect of bioresorbable PLF in ear middle surgery has not been reported. The purpose of this study is to evaluate the antiadhesive effect of PLF in guinea pigs serving as a model for middle ear mucosal trauma.
  
  
  METHODS
  The animals were divided into two groups: the PLF group and the silastic sheeting group. There were seven guinea pigs (fourteen ears) in both groups. Under aseptic conditions, the middle ear mucosa was abraded using a pick inserted transbullaly. A PLF or silicone sheet was then placed into the guinea pigs' middle ear cavities. The auditory brainstem responses (ABRs) were assessed preoperatively and at three weeks postoperatively while the animals were under general anesthesia. A histopathological study was performed 3 weeks after the operation.
  
  
  RESULTS
  The difference between the ABR results before the operation and three weeks postoperatively were not statistically significant. The adhesion formation did not appeared in either group. Prominent fibrous capsule formation and inflammation were observed in the silastic sheeting group, but not in the PLF group. Mild fibrous thickening of regenerated mucosa was observed in the PLF group.
  
  
  CONCLUSIONS
  From our results, bioresorbable PLF is nonototoxic and biocompatible with the guinea pig's middle ear cavity by short-term evaluation. Further long-term evaluation study is necessary before clinical application.
authors.affiliation: Department of Otolaryngology, Chonnam National University Medical School, Gwangju, South Korea. Electronic address: chulsavio@hanmail.net.
authors.forename: Chul Ho
authors.initials: CH
authors.lastname: Jang
authors.affiliation: Department of Otolaryngology, Chonnam National University Medical School, Gwangju, South Korea.
authors.forename: Si Young
authors.initials: SY
authors.lastname: Jo
authors.affiliation: Department of Otolaryngology, Chonnam National University Medical School, Gwangju, South Korea.
authors.forename: Yong Beom
authors.initials: YB
authors.lastname: Cho
authors.affiliation: Department of Bio New Drug Development, Chosun University, Gwangju, South Korea.
authors.forename: Cheol Hee
authors.initials: CH
authors.lastname: Choi
authors.affiliation: Department of Biomedical Engineering, and Center for Marine-Integrated Biomedical Technology (BK 21 Plus), Pukyong National University, Pusan, South Korea.
authors.forename: Won Kyo
authors.initials: WK
authors.lastname: Jung
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D004432:Ear, Middle; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology; D005355:Fibrosis; D006168:Guinea Pigs; D009092:Mucous Membrane / Q000293:injuries* / Q000473:pathology; D011091:Polyesters / Q000627:therapeutic use*; D000267:Tissue Adhesions / Q000517:prevention & control*; D014945:Wound Healing
chemical_list: D011091:Polyesters; C033616:poly(lactide)
keywords: Adhesion; Middle ear; Packing; Polylactide film