Among the silk manuscripts unearthed from Mawangdui No.3 Han dynasty Tomb, there are two pieces of silks record the literature which relate to Yi. One of them records Zhouyi and Ersanziwen, and the other one records Xici, Zhong, Yao, Miuhe and Zhaoli. Many scholars believed that the two silk manuscripts were written by the same writer. After comparing plenty of characters, we found that the fonts of these two silk manuscripts have obvious differences in components, strokes and structures. Therefore, we believed that these two manuscripts are probably not be written by one person. Moreover, there still remains controversy about the age of the master copies of these literatures which relate to Yi. After analyzing some special characters and words in these literatures, we speculated that the master copy of Xici which was written earlier than the Qin Dynasty, is influenced by the Chu characters of the Warring States and written by seal-clericle script. The languages of some part of Yao and Miuhe are obviously influenced by Qin dynasty’s language using habits.

본 논문은 중국의 국방·안보백서 발간의 추이와 함의를 분석하기 위한 것이다. 이를 위해 중국의 국방·안보백서의 발간경위 및 구성, 시진핑 시기의 국방·안보백서의 요지와 함의의 순서로 살펴본 후 결론을 도출해 본 것이다. 중국 국방부는 1998년 이후 2010년까지 2년 주기로 7권의 『중국의 국방』을 발간했다. 그리고 중국 국방부는 이미 1995년 국방관련 주제의 백서 『중국의 무기통제와 군축』을 처음 발간한 데 이어, 2013년 『중국 무장역량의 다양한 운용』, 2015년 『중국의 군사전략』의 3권의 국방관련백서, 그리고 2017년 『중국의 아시아·태평양 안보협력정책』이라는 1권의 안보백서를 발간했다. 모두 중국의 전략적 계산을 반영한 프로파간다라는 공통적 특징을 지니고 있다. 중국이 전향적으로 국방백서를 발간하기 시작한 데는 ①미국　등 주변국의 군사적 투명성 요구에 대한 압력, ②‘중국위협론’의 불식, ③중국의 군사 현대화의 성과에 대한 자신감 등 복합적 요인이 작용한 것으로 보인다. “중국의 꿈은 강국의 꿈이고 강국의 꿈은 강군건설이 필수이다.”라는 시진핑의 의지가 담긴 ‘적극적 방어전략’ 및 강대강전략은 주변국에게 안보적 우려감을 증폭시키고 있다. 튼튼한 한·미 안보공조관계를 유지·강화해 나가는 한편, 한중경제협력관계도 조화롭게 추진해 나가는 헤징전략이 우리에게 요구된다.

The purpose of this study was to evaluate the protective effect of PineXol® on H2O2-induced cell death in SK-N-MC cells, and in early stage focal ischemia rodent model. SK-N-MC cells were pre-treated with 200 μM H2O2 or various concentrations of PineXol® (10, 30, and 50 pg/mL) for 24 h, and then exposed to H2O2 for 3 h. Cell death was assessed by the CCK-8 assay, reactive oxygen species (ROS) assay, and lactate and dehydrogenase (LDH) release assay. Superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) expressions were also analyzed by western blotting. Focal ischemia rodent model was used as the in vivo model, and different concentrations of PineXol® (1, 10, and 100 mg/kg) were administered. One week after administration, reduction of infarct volume was analyzed by TTC staining. Cell viability of H2O2-treated SK-N-MC cells significantly increased by pre-treatment of PineXol® (p<0.05). PineXol® pre-treatment also induced significant decrease of ROS and LDH expressions. However, PineXol® did not affect the infarct volume. These results suggest that PineXol® has significant neuroprotective effect in vitro, but statistical significance was not confirmed in the in vivo focal ischemia mo

Chapter One (甲篇) of Yin Yang Wu Xing in “The Compilation of Mawangdui Silk Manuscript” (《長沙馬王堆漢墓集成》), which has been seriously damaged, still needs further adjustments. From line 1 to 16 (Jicheng Vol.1 p250-251) in Zhu Shen Ji Xiong, we delete two silk pieces and move 2 other pieces according to the Fan Yin Wen (反印文) in Chapter Xi (徙), Tian Di (天地) and Nv Fa (女發) (Ji Cheng Vol.1 p244-245). Some pieces have been added. New transcription can be given by those adjustments. We notice that figures in this chapter were pieced and numbered mistakenly. Some line numbers of transcriptions do not match their figures. In addition, some texts that can be read together were separated.

This study was conducted to evaluate the neuroprotective effects of Cheonggukjang extract in in-vitro and in-vivo models. T98G-human glioblastoma cells were pretreated with various concentrations (1~10 mg/mL) of Cheonggukjang extract for 24 h and then exposed to H2O2 (1 mM) for 3 h. The neuroprotective effects of Cheonggukjang extract were measured using a CCK-8 kit assay, total antioxidant capacity (TAC) assay, reactive oxygen species (ROS) assay, and lactate dehydrogenase (LDH) release assay. The early stage focal ischemia rodent model was used as the in-vivo neurotoxicity model. Various concentrations (10~200 mg) of Cheonggukjang extract were administered to the animal models for 1 week. Peripheral blood was analyzed for glutathione peroxidase (GPx) expression by ELISA, and infarct volume reduction was analyzed by TTC staining. Cheonggukjang extract significantly (p<0.05) increased cell viability in T98G cells against H2O2 as well as against the induced neurotoxicity. Indeed, treatment with the Cheonggukjang extract induced a decrease in ROS and LDH expression and increased TAC significantly (p<0.05). However, Cheonggukjang extract did not induce a decrease in infarct volume or an increase in GPx expression in the in-vivo model. Despite the limitation in neuroprotection, Cheonggukjang extract may be useful for treating ROS injury.

최근 식용곤충에 대한 관심이 급증함에 따라 본 연구에서는 경북 문경지역에서 2013년도에 채취한 벼메뚜기를 동결건조하여 분말화한 후 백서에게 섭취시켰을 때 나타나는 혈중 지질 성분의 개선효과를 검토하였다. 동시에 지구성 운동을 부하 하였을 때 나타나는 상승효과를 분석하였다. ICR 마우스 28마리를 네 집단으로 구 분하였다. 집단은 대조군(CON), 운동군(EX), 메뚜기 섭취군(GH), 메뚜기 섭취 + 운동 병행군(GHEX)으로서 7마리씩 구분하였다. 총 섭취 및 운동기간은 6주였으 며, 메뚜기 분말은 사료 중 카제인과 1:1로 치환하여 공급하였다. 분석은 중량, 지방 량, 그리고 혈중 지질성분으로서 총콜레스테롤(TC), 고밀도지단백콜레스테롤 (HDL-C), 저밀도지단백콜레스테롤(LDL-C) 그리고 중성지방(TG)으로 하였다. 사육 종료 후 체중 증가량은 집단 구분의 순서대로 10.32 g, 9.25 g, 13.90 g, 11.60 g으로 각각 나타났으며, 저장 지방량은 0.60 g, 0.37 g, 0.39 g, 0.31 g으로 각각 나타 났다. TC는 CON에 비하여 EX 2.93%, GH –8.50%, GHEX –19.06%의 변화가 나 타났으며, HDL-C는 CON에 비하여 EX 50.72%, GH 46.85%, GHEX 54.96%의 변화가 나타났다. LDL-C는 CON에 비하여 EX –27.95%, GH –53.81%, GHEX – 69.16%의 변화가 나타났으며, TG는 CON에 비하여 EX –15.86%, GH –-6.82%, GHEX –42.62%의 변화가 나타났다. 이상과 같은 결과는 벼메뚜기 섭취 혹은 운동 과 병행하며 섭취하였을 때 혈중 지질성분을 개선하여 대사증후군을 예방·개선할 수 있다는 점을 시사하며 이는, 메뚜기에 다량 함유되어 있는 불포화지방산에 의한 것이라 판단된다.

본 연구팀은 누에 번데기 섭취에 의한 근육량 증가를 보고한 바 있다. 지속 연구 로서 경북 영덕군에서 생산된 누에번데기를 동결건조하여 분말화한 후 백서에게 섭취시켰을 때 나타나는 혈중 지질 성분의 개선효과를 저항성 운동을 부하하였을 때 나타나는 상승효과와 함께 분석하였다. ICR 마우스 28마리를 네 집단으로 구분 하였다. 집단은 대조군(CON), 운동군(EX), 메뚜기 섭취군(SP), 메뚜기 섭취 + 운 동 병행군(SPEX)으로서 7마리씩 구분하였다. 총 섭취 및 운동기간은 8주였으며, 번데기 분말은 사료 중 카제인과 1:1로 치환하여 공급하였다. 분석은 중량, 지방량, 그리고 혈중 지질성분으로서 총콜레스테롤(TC), 고밀도지단백콜레스테롤 (HDL-C), 저밀도지단백콜레스테롤(LDL-C) 그리고 중성지방(TG)으로 하였다. 사육 종료 후 체중 증가량은 집단 구분의 순서대로 26.22 g, 13.33 g, 19.60 g, 9.07 g으로 각각 나타났으며, 저장 지방량은 1.30 g, 0.70 g, 0.87 g, 0.50 g으로 각각 나타 났다. TC는 CON에 비하여 EX 0.39%, SP –13.54%, SPEX –22.77%의 변화가 나타 났으며, HDL-C는 CON에 비하여 EX 12.19%, SP 8.61%, SPEX 31.10%의 변화가 나타났다. LDL-C는 CON에 비하여 EX –9.83%, SP –39.84%, SPEX –78.23%의 변 화가 나타났으며, TG는 CON에 비하여 EX -16.91%, SP –23.38%, SPEX –73.88% 의 변화가 나타났다. 이상과 같은 결과는 누에 번데기 섭취 혹은 운동과 병행하며 섭취하였을 때 혈중 지질성분을 개선하여 대사증후군을 예방·개선할 수 있다는 점 을 시사하며 이는, 메뚜기에 다량 함유되어 있는 양질의 아미노산 및 불포화지방산 에 의한 것이라 판단된다.

Toxic heavy metals like mercury and cadmium are known to involve in altering the salivary flow so that can be appeared sialorrhea or ptyalism, the condition of increased salivary flow, or xerostomia (“dry mouth”), the condition related to inhibited or decreased salivary flow. Although many people were exposed to these heavy metal in work environment, dental clinics, the mechanism is rarely discussed in the clinical literature. The present study is to carried out analysis of AQP5 expression that play a key role in saliva fluid secretion and cell membrane water permeability on mercury- or cadmium-exposed mice submandibular gland. To investigate AQP 5 expression, immunohistochemical study and western blot assay were carried out on mercury- or cadmium-exposed mice. Additionally, RT-PCR, real- time PCR with specific primers were carried out. Cadmium or mercury exposure led ductal extension, ductal cell increase, and blood vessel increase in mouse submandibular gland. The mRNA and protein expression of AQP5 were increased in time dependent manners on cadmium or mercury exposed mouse. Also, AQP5 were translocated from basolateral membrane to apical membrane of acini cell. In conclusion, toxic heavy metal such as mercury and cadmium appear to alter the AQP5 expression and distribute to apical membrane of ductal cell and lead to alter salivary secretion.

골유도재생술은 골결손부의 부피를 회복하기 위해 차폐막을 이용하는 치과수 술이다. 이 차폐막에는 동물유래의 콜라겐과 합성재료로서 polytetrafluoroethylene (PTFE)를 이용한 것이 개발되어 있다. 본 연구에서는 백서두정골에 인위적 결손부 를 형성하고 실크 차폐막의 골유도재생효과를 평가해보았다. 이를 위해 총 30마리 의 Sprague-Dawley 백서가 사용되었는데, 실크차폐막을 실험군으로, 콜라겐 차폐 막(Rapi-gideⓇ)과 PTFE(cytoplastⓇ)을 대조군으로하여 각각 10마리씩 적용하였 다. 백서 두정골에 하나의 골 결손부를 형성한 후, 차폐막을 덮고 4주, 8주에 희생시 켜서 방사선학적 방법(μ-CT)으로 골생성정도를 비교해보았다. 결과, 수술 4주후 에는 실크(13.58mm 3 )와 콜라겐(7.06mm 3 ), PTFE(1.86mm 3 )대조군사이에 큰 차이 가 있었다(p <0.05). 수술 8주 후에는 각 군 사이에 큰 차이는 없었다(p >0.05). 하지 만 실크 차폐막 적용군에서는 다른 대조군들과는 달리 이물질 반응이 거의 없는 조 직학적 소견이 관찰 되었다. 결론적으로, 이 실험에서, 실크차폐막이 골유도재생술 을 위한 재료로써 유효함을 알 수 있었다.

The aim of this study is to find out histomorphologic change and cellular activity of condyle resulted from unilateral mastication by comparison of cell proliferation and apoptosis activity. 30 adult rats were dived to 15 experimental group and 15 control group randomly. Right upper and l ower molars were gently extracted in experimental group, to make unilateral mastication environment. All subjects were sacrificed at 1 week, 2 weeks and 4 weeks by chloroform, and their tissues were prepare to observation. Streptovidin-biotin system for BrdU stanning, was used to determine cellular proliferative activity. TUNEL method was used to determine apoptotic activity. The result for cellular activity was recorded at both of anterior portion and posterior portion of condyle. Hematoxylin and Eosin stanning was used for histiomorphological change. The results were as follows. There were more change in superficial layer than deep layer of condyle in cellular activity. In anterior portion of condyle cartilage, cellular proliferative activity of experimental group was lower than control group and apoptotic activity of experimental group was higher than control group. And apoptotic activity of extracted side in experimental group is the most. In posterior portion of condyle cartilage, cellular proliferative activity of extracted side in experimental group was higher than non-extracted side and control group, And apoptotic activity of extracted side in experimental group was the low. As a result of histomorphological change, there was hyperplasia in posterior region o f extracted side c ondyle i n experimental g roup, but t here was n o change i n unextracted side i n experimental group. There was histomorphological hyperplasia in posterior condyle of experimental group as results of high cellular proliferative activity. There was mainly apoptotic change of anterior portion condyle in experimental group. But there was no histomorphologic change. In other words, there was hyperplasia by increasing of cellular proliferative activity in posterior portion of nonfunctional side condyle. In functional side condyle, there was no histomorphological change in functional condyle, but there was change in cellular activity.

Amino acid transporters play an important role in supplying organic nutrient to cells. The expression profile of L-type amino acid transporter 1 (LAT1) and its subunit 4F2 heavy chain (4F2hc) on different differentiation stages in 4-NQO induced rat tongue carcinogenesis was examined using immunohistochemical analysis. The gradually increasing LAT1 and 4F2hc expression detected during the multistep progressive change shows that the protein may have an important role i n the multistep tongue c arcinogenesis. Conclusively, LAT1 and 4F2 hc c an b e a useful b iomarker f or a better understanding of multistep tongue carcinogenesis, while the specific inhibition o f LAT1 and 4F2 hc would be a new rationale for suppressing tumor cell growth in tongue cancer.

This study was designed to investigate the effects of treadmill exercise of low-intensity and moderate- intensity on the functional recovery and histological change in spinal cord injury (SCI) rats. SCI was induced by the spinal cord impactor dropped after laminectomy. Experimental groups were divided into the Group I (normal control), Group II (non-treatment after SCI induction), Group III (low-intensity treadmill exercise after SCI induction), Group IV (moderate-intensity treadmill exercise after SCI induction). After operation, rats were tested at modified Tarlov scale at 2 days with divided into 4 groups, and motor behavior test (BBB locomotor rating scale, Grid walk test) was examined at 3, 7, 14, and 21 days. For the observation of damage change and size of the organized surface in spinal cord, histopathological studies were performed at 21 days by H & E, and BDNF(brain-derived neutrophic factor) & Trk-b immunohistochemistry studies were performed at 1, 3, 7, 14, 21 days. According to the results, treadmill exercise can play a role in facilitating recovery of locomotion following spinal cord injury. Specially, moderate-intensity treadmill exercise after SCI induction was most improvement in functional recovery and histological change.

This study was designed to examine the effects of electroacupuncture and treadmill exercise on the improvement of muscle atrophy and Brain-Derived Neurotrophic Factor (BDNF) expression in an ischemic stroke model induced by middle cerebral artery occlusion. This study selected 120 Sprangue-Dawley rats, divided them into six groups, and assigned 5 rats to each group. Experiments were conducted for 1, 3 days and 1, 8 weeks, respectively. In each group, changes in weight of muscle and relative muscle of tibialis anterior muscle, histologic observations, and BDNF expression were observed and analyzed. For the changes in muscle weight of unaffected and affected sides of tibialis anterior, muscle atrophy was expressed in an affected side 3 days after ischemic stroke was induced. There was a statistically significant difference in Group VI 1 and 8 weeks after ischemic stroke was induced, compared to Group II (p<.05). For the changes in relative muscle weight of unaffected and affected sides of tibial anterior muscle, there was significant decrease in each group 3 days after ischemic stroke was induced, compared to Group I, while there was a statistically significant increase in Group VI 1 week after ischemic stroke was induced, compared to Group II (p<.05). For neurologic exercise behavior test, Group VI generally had the highest score, compared to other groups. The results of the behavior test suggests that 8 weeks after ischemic stroke was induced, Group VI improved in degeneration and inflammation of muscle fiber and decreased in destruction of nerve cells and cerebral infarction, thus indicating a similar state of muscle fiber and brain tissue in Group I. In immunohistochemical observations, Group 1 week showed increase in BDNF. Based on these results, electroacupuncture and treadmill exercise may improve muscle atrophy and change in BDNF expression of ischemic stroke rats and contribute to the improvement of exercise function.

Ischemic stroke results from a transient or permanent reduction in cerebral blood flow that is restricted to the territory of a major brain artery. Thus, this study was performed to examine (1) the effects of swimming exercise on the improvement of muscle atrophy, and (2) exercise and HSP 70 expression in an ischemic stroke model induced by middle cerebral artery occlusion. The results of this study were as follows: One week after ischemic stroke was induced, changes appeared in the muscle weight of the gastrocnemius muscle due to muscle atrophy in the affected side. Group II showed statistically significant difference from group III eight weeks after ischemic stroke was induced. (p<.05). One week and eight weeks after ischemic stroke was induced there was significant decrease in the relative muscle weight of the gastrocnemius muscle in each group except Group IV, while there was statistically significant increase in group II eight weeks after ischemic stroke was induced, compared to group III (p<.05). For neurologic exercise behavior tests, Group II generally had the highest score, compared to other groups. In immunohistochemical observations, Group II showed a decrease in HSP 70. The above results suggest that swimming exercise improved muscle atrophy, changed the HSP 70 expression of ischemic stroke in rats, and contributed to the improvement of exercise function.

This research was designed to investigate changes of growth factors and bone matrix proteins during the bone healing processes using immunohistochemistry and in situ hybridization. Especially this study was focused on the changes of bone matrix and growth factors around the titanium implant. Threaded implants were introduced into the long bone of tibia. Time dependent changes of several bone associated protein and and its mRNAs were observed. Proteins investigated in this study are collagen, osteonectin(ON), osteopontin(OPN), osteocalcin(OC). Expression of the proteins were measured using immunohistochemistry. VEGF and ON were measured using in situ hybridization, and northen blot technique. Bone regeneration were observed as early as the third day of experiment. Matrix proteins and growth factors observed around implant were identical to the proteins observed in the control group. The expression of the ON, OC and VEGF were observed mainly in the osteoblast-like cell on the surface of new bone around the implant and the cells lining the margin of bone defect apart from the implant. The observation may not result from direct osteoconducting activities of titanium but by passive adsorption of extracellular factors which has bone inducing capacities. These passive adsorption results in the immobilization of the growth factors and consequent prolongation of the activities.

폐경기 여성은 동령 남성보다 퇴행적 뇌질환의 빈도가 유의적으로 높으며 이를 예방개선하기 위한 목적으로 에스트로젠 대체요법이 시행되고 있으나 유방암과 자궁암 유발 위험성이 제시되고 있어 콩류 등에 다량 함유되어 있는 phytoestrogen류인 isoflavone을 이용한 대체요법 개발이 활발하다. 밀착결합에 의해 제공되는 혈액-뇌확산장벽은 뇌의 항상성 조절에 중요한 역할이 있으며 다양한 뇌질환에서 변형이 일어난다. 본 연구는 난소절제 백서 모델에서 폐경

Osteoporosis is the most prevalent metabolic bone disease and is characterized by diminished bone strength predisposing to an increased risk of fracture. Thus, this study was performed (1) to examine the effect of aquatic exercise on osteoporosis caused by an ovariectomy in the rats, and (2) to elucidate involvement of histopathologic findings in mediating these actions. The results of this study were as follows: 1. Body weight of the subjects increased after the experiment. There was a statistically significant difference (p<.05) between Group I (sham operated) and Group II (control group). 2. In respect to the length, circumference and weight of the femur, there was no statistically significant difference between the control group and the other groups (p>.05). 3. With the osteocalcin level used as one of the bone formation indexes the bone mineral density increased in every group in comparison with the control group, and in particular, there was a statistically significant difference between Group III and Group IV. The above results suggest that aquatic exercise treatment is effective in the prevention and treatment of osteoporosis.

The number 01' patien ts with tongue carcinoma is increasing rapidly among young indiv idua ls in many parts of the worl d. Until now‘ most of studies were focused on the comparison malignancy wi th normal 01' dysplasia. There is little report of gene a lterations in normal to cancer , oral carcinogenesis. The purpose of present study is to evaluate the gene a ltc ration in every steps of oral carcinogenes is by DD- PCR. To induce tongue carcinoma in rat by 4- NQO. each dri nking water made 10ppm. 25ppm. 50ppm and control(o nly D.W without 4-NQO) . Specimens were classified into 4 groups s uch as co ntrol, I(mild & mocle rate dysplasia) , II(severe dysplasia and car cinoma in s itu) , III(carcinoma). Total RNA was ext racted and DD- PCR was performed using customized random primers. And to confïrmed t he results of DD-PCR‘ RT- PCR a nd real-time PCR with specific primers were carried out. There was phenotypic alteration in tongue 。f dosc a nd t imc dc pcndcnt man ncr. In gross examination, multiple papules, patch form or ulcerations were observed during 4 - NQO t reatment Hi s tologicall y, dysplasia was observed in 3 to 6 month and tumor formation in 6 to 8 month For DD-PCR, RT-PCR and real-time PCR, cyclophilin A, BAC RP23-372MB and BAC CH230-103E9 were differ entia lly expressed. Taken together, cyclophilin A has a role in all steps of oral carcinogenesis. BAC RP23-372N田is implica ted in carcinoma in s itu a nd BAC CH230-103E9 mRNA expression is assoicated with dysplasia and carcinom in s itu Conclus ively. some genes a re impli catcd a ll st eps of oral carci nogenesis, others are associated with one step, whi ch meant that genes are di fferentia lly expressed in every steps

LEDs have been shown to be a safe, efficient, light-weight, and less-expensive alternative to heal wound. LED irradiation at the same biostimulatory wavelength of previous laser studies have similar biochemical effects The purpose of present study is to evaluate the effects of wound healing by LED irradiation. Thirty 34-day-old sprague dawley were used for present study. 1.5mm diameter defected holes were formed in both ear lobes of rat by rubber dam punch. 635nm and 890nm irradiation was performed by LED for 2 weeks, followed by histologíc examination staíned with H&E and Masson trichrome. Also, RT-PCR was carried out to find out the mRNA expression level in gingival fjbroblast irradiated by 635nm for 1 hour. In gross exarnination, wound healing was observed in irradiated group comparing to control For microscopic exarnination, repair by connective tissues was filled in defects of irradiated group, while dense cellular bands consisting of fjbroblasts and capi llaries were found at the end of defect in control By staining of masson trichrome, amount of collagens were found in irradiated group. In a result of RT-PCR, mRNA expressions of TGF- ß , MMP-1,3 and Timp-3 were down-regulated in irradiated group comparing with their expression in control group. Taken together, LED irradiation increase the prolifeation and the activity of fibroblasts and down-regualted the TGF-ß , MMP- 1,3 and Timp- 3 mRNA, followed by activation of would healing.

μ방lt emitting diodes (LED) devices are commercially introduced as an alternative for low-Ievellaser therapy (11ι，T) ， and it has several advantages over lasers such as a safe, efficient, and less-expensive altemative to treat wounds. And LED irradiation at the same biostimulatory wavelength has similar bíochemical effεαs. In the present study, to asses whether the I핑ht-emitting diode (LED) irradíation can stimulate bone regeneration, irradiated bony defects with or without grafting materials on rat calvaria were compared to corresponding nonirradiated control. Fifty male Sprague-Dawly rats weighing about 150g, were used. Factors for present study were designed as follows, 1) presence or absence of grafting materials, 2) with or without irradiation, and 3) number of irradiation. Two weeks after operation, rats were sacrifìced. Radiologic and 비stomorphologic fmdings were evaluated. Macrospically, there were no incidents of infection, dehiscence, hematoma and necrosis during study. Radiological findings showed greater radiopacity in the graft group and radiopacity increased as the number of irradiation increase. And microscopically, new bαle formation was great in the graft group and increased as the number of irradiation increase, Present study has shown that LED irradiation improved bone regeneration through radiologic and histomorphologic fmdings in rat.