Papers by Author: Jae Hyup Lee

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Authors: S.W. Jung, Jae Hyup Lee, Jae Bok Nam, H.W. Nam, Kyung Seop Han
1297
Authors: Sung Su Chun, S.W. Na, Jae Hyup Lee, J.P. Chung, I.C. Ryu, Suk Young Kim
149
Authors: Jae Hyup Lee, Hyun Seung Ryu, Dong Soo Lee, Kug Sun Hong, Bong-Soon Chang, Choon Ki Lee
Abstract: The purpose of this study is to compare the osseointegration of calcium pyrophosphate(CPP) coated screws with uncoated screws. CPP coating was prepared and coated by dipping method. CPP coated and uncoated screws were inserted into the mongrel dogs. The insertion torques, radiographs, histology, histomorphometric analysis, and extraction torques were evaluated at 2, 4, and 8 weeks after surgery. The insertion torque was not different between CPP coated and uncoated screws. The extraction torques of CPP coated screws at 2, 4, and 8 weeks(5.45±2.05, 7.62±1.51 and 6.60±2.80 cNM) were significantly higher than their insertion torques(2.74±1.13, 2.98±0.70, and 2.18±1.34 cNM)(p<0.0001, <0.0001 and 0.0005 respectively) and significantly higher than the extraction torques of uncoated screws(1.14±0.470, 2.57±1.36, and 3.18 ±0.499 cNM). The percentages of direct bone-screw contact of CPP coated screws were statistically higher than those of uncoated screws at 2, 4, and 8 weeks. These results suggest that CPP coating may improve the clinical results by allowing early motion exercises and early weight bearing.
219
Authors: Jae Hyup Lee, Hyun Seung Ryu, Jun Hyuk Seo, Hwan Kim, Kug Sun Hong, Bong-Soon Chang, Choon Ki Lee
Abstract: The purpose of our study is to compare the biodegradation and osteoconduction between CaO-SiO2-B2O3 glass-ceramics(CS10B) and hydroxyapatite(HA), tricalcium phosphate(TCP). Porous CS10B implants were prepared by polymer sponge method. Single-level posterolateral spinal fusions were performed on thirty rabbits. The animals were divided into three groups by implant material: HA, TCP and CS10B. Radiographs checked every two weeks. All animals were sacrificed 12 weeks after surgery. The proportion of the area occupied by ceramics in final radiography on the initial radiography was calculated. Uniaxial tensile strength was measured on 7 cases in each group. The proportion of the area of HA(88.7%±16.1) was significantly higher than those of the others(p<0.05), and the proportion of the area of CS10B(28.2%±9.3) was significantly lower than those of HA and TCP(37%±9.6)(p<0.05). The mean values of tensile strength of the HA(191.4±33.5 N) and CS10B(182.7±19.9 N) were significantly higher(p<0.05) than those of the TCP(141.1±28.2 N). CS10B showed the tensile strength of fusion masses similar to those of the HA, however, more rapid biodegradation than HA and TCP. These findings suggest that CS10B grafts have the possibility as a bone graft substitute.
905
Authors: Jun Hyuk Seo, Hyun Seung Ryu, K.S. Park, Kug Sun Hong, Hwan Kim, Jae Hyup Lee, D.H. Lee, Bong-Soon Chang, C.K. Lee
147
Authors: Hyun Seung Ryu, Jun Hyuk Seo, Hwan Kim, Kug Sun Hong, H.J. Park, Dae Joon Kim, Jae Hyup Lee, D.H. Lee, Bong-Soon Chang, C.K. Lee
261
Authors: T.W. Kim, Hyo Seon Park, Chul Kim, Jae Hyup Lee
295
Authors: K.S. Park, Hyun Seung Ryu, Jun Hyuk Seo, Kug Sun Hong, Hwan Kim, Jae Hyup Lee, D.H. Lee, Bong-Soon Chang, C.K. Lee
151
Authors: Jun Hyuk Seo, Hyun Seung Ryu, Kug Sun Hong, Hwan Kim, Dae Joon Kim, Jae Hyup Lee, D.H. Lee, C.K. Lee
273
Authors: Jae Hyup Lee, D.H. Lee, Hyun Seung Ryu, Bong-Soon Chang, Kug Sun Hong, C.K. Lee
399
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