Shape retention in porcine-septal cartilage following Nd:YAG (? = 1.32 ?m) laser-mediated reshaping

Autor: Brian J. F. Wong, Darren S. Gray, Joey A. Kimball
Rok vydání: 2001
Předmět:
Zdroj: Lasers in Surgery and Medicine. 29:160-164
ISSN: 1096-9101
0196-8092
DOI: 10.1002/lsm.1104
Popis: Background and Objective: Photothermal heating of mechanically deformed cartilage accelerates stress relaxation and results in sustained shape change. In this study, shape retention was measured in Nd:YAG laser reshaped porcine septal cartilage. Materials and Methods: Specimens were laser reshaped either 4 (Group I) or 28 hours (Group II) following extraction from the crania. Specimens were bent into approximately semicircular shapes and irradiated half way between the endpoints of the semicircle. Resultant bend angle was calculated based on linear measurements. Shape retention was calculated by comparing resultant curvature with pre-irradiation measurements. Results: Mechanical deformation alone resulted in initial bend angles varying from 188° to 229°. Resultant bend angles varied from 84° to 194° corresponding to shape retention varying from 58 to 75%. Non-irradiated cartilage retained less than 46% of the original bend. Shape retention was greater in Group II, compared to Group I. In Group I, no cephalocranial difference in shape retention was observed, though in Group II greater shape retention was observed in rostral specimens. Conclusion: While laser heating does significantly reshape cartilage, clinical use of this technology will require “overbending” of the cartilage graft to compensate for this memory effect. The degree of overbending is likely to vary with cartilage type and location. Lasers Surg. Med. 29:160–164, 2001. © 2001 Wiley-Liss, Inc.
Databáze: OpenAIRE
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