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Remodeling of the rat gingiva induced by CO2 laser coagulation mode.

Abstract：

BACKGROUND AND OBJECTIVES:This study was conducted to clarify the morphologic characteristics and subsequent repair process of coagulation necrosis produced by pulsed CO(2) laser irradiation with relatively low fluence, and thereby to evaluate the clinical efficacy of this irradiation mode. STUDY DESIGN/MATERIALS AND METHODS:Wounding of rat gingiva to produce coagulation necrosis was done with a CO(2) laser with a fluence of 326 J/cm(2). The structural characteristics of the wound and subsequent repair process were examined by means of histology, immunohistochemistry, and electron microscopy. RESULTS:At 6 hours after irradiation, the cells in the laser wound appeared histologically intact but had lost the immunoreactivity to antibodies against Hsp47 and exhibited various ultrastructural signs of cell death. This wound area was lined by Hsp70-positive cells. At 1-day post-irradiation, the uptake of BrdU rapidly increased in the adjacent epithelium and connective tissue. The re-epithelization commenced at 1 day and was completed by 7 days. The necrotic tissue gradually became integrated within the newly formed connective tissue and the original contour of the gingiva was retained during the repair process. The repair process of the laser-induced wound progressed more rapidly than that of a scalpel-made wound. CONCLUSIONS:The present study suggests that the coagulation necrosis produced by the low fluence pulsed CO(2) laser does not disturb the repair process but promotes its steady progress and subsequent tissue remodeling. This laser mode will pave the way for more conservative and minimally invasive surgery for treating a wide variety of oral soft tissue disorders.

journal_name

Lasers Surg Med

journal_title

Lasers in surgery and medicine

authors

Yamasaki A,Tamamura K,Sakurai Y,Okuyama N,Yusa J,Ito H

doi

10.1002/lsm.20712

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

695-703

issue

10

eissn

0196-8092

issn

1096-9101

journal_volume

40

pub_type

杂志文章

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