HISTOLOGICAL STUDY OF EFFECT OF LOW LEVEL LASER GAAS ON RATE AND QUALITY OF BONE FORMATION IN DISTRACTION OSTEOGENESIS IN RABBIT

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GHOREYSHIAN SEYED MAHDI; DEYHIMI P.; FAZILAT F.

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Journal: Journal of Isfahan Dental School Year:2008 | Volume:4 | Issue:1 Page(s): 8-16

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Title

HISTOLOGICAL STUDY OF EFFECT OF LOW LEVEL LASER GAAS ON RATE AND QUALITY OF BONE FORMATION IN DISTRACTION OSTEOGENESIS IN RABBIT

Author(s)

GHOREYSHIAN SEYED MAHDI | DEYHIMI P. | FAZILAT F. | Issue Writer Certificate

Keywords

DISTRACTION OSTEOGENESISQ3

GAAS LASERQ3

HISTOLOGYQ2

SCANNING ELECTRON MICROSCOPYQ3

LIGHT MICROSCOPYQ3

Abstract

Introduction: Although DISTRACTION OSTEOGENESIS is a surprising modality in treatment of many of deformities in craniofacial region, but often tolerance of distractor devices is hard and problematic for many of patients. If low level lasers can increase rate of ossification, cause shortening of treatment duration, and cause lessening of problems of patients. Therefore, purpose of this study was determination of effectiveness of low level laser in acceleration of new bone formation and consequently shortening of treatment period and decrease of problems of distractor device.Materials and Method: In this study, after corticotomy, distractor devices were placed in mandibular body of 18 white zelanian rabbits and after 5 days, were activated at a rate of 1mm/day for 10 days. 9 rabbits were exposed to 7 doses of GAAS LASER with power of 200 μw every other day and other 9 rabbits received no laser. Then, the rabbits were periodically sacrificed in the 10th, 20th and 40th days of consolidation period and obtained samples were studied by SCANNING ELECTRON MICROSCOPY and LIGHT MICROSCOPY and then analyzed by Mann-Whitney method (0.05).Results: In SEM and histological examinations, the amount and orientation of fibroblasts and fibrous tissue in the 10th day was greater in laser group than in control group. In the 20th day, in addition to fibrous tissue, the amount of woven bone was greater in laser group than that in control group but the degree of their difference wasn't significant and really was smaller as compared with the 10th day. In the 40th days in each of two groups of laser and control, woven and lamellar bone were seen but no significant difference of new bone formation was found in the laser group as compared with control group. It appears that laser radiation in initial stages of distraction is more effective than end stages.Conclusion: Probably PH changes in cell oxidation and reduction (Redox regulation) is an etiologic factor in incidence of this process; as though in initial stages that PH of tissue is in reduction limit because of trauma, radiation is more effective than late stages that PH of tissue is more stable. For the best result, it is necessary extensive researches about distraction protocol and laser radiation.

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APA: Copy

GHOREYSHIAN, SEYED MAHDI, DEYHIMI, P., & FAZILAT, F.. (2008). HISTOLOGICAL STUDY OF EFFECT OF LOW LEVEL LASER GAAS ON RATE AND QUALITY OF BONE FORMATION IN DISTRACTION OSTEOGENESIS IN RABBIT. JOURNAL OF ISFAHAN DENTAL SCHOOL, 4(1), 8-16. SID. https://sid.ir/paper/126085/en

Vancouver: Copy

GHOREYSHIAN SEYED MAHDI, DEYHIMI P., FAZILAT F.. HISTOLOGICAL STUDY OF EFFECT OF LOW LEVEL LASER GAAS ON RATE AND QUALITY OF BONE FORMATION IN DISTRACTION OSTEOGENESIS IN RABBIT. JOURNAL OF ISFAHAN DENTAL SCHOOL[Internet]. 2008;4(1):8-16. Available from: https://sid.ir/paper/126085/en

IEEE: Copy

SEYED MAHDI GHOREYSHIAN, P. DEYHIMI, and F. FAZILAT, “HISTOLOGICAL STUDY OF EFFECT OF LOW LEVEL LASER GAAS ON RATE AND QUALITY OF BONE FORMATION IN DISTRACTION OSTEOGENESIS IN RABBIT,” JOURNAL OF ISFAHAN DENTAL SCHOOL, vol. 4, no. 1, pp. 8–16, 2008, [Online]. Available: https://sid.ir/paper/126085/en

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