The purpose of this study was to investigate the effects of investing conditions on the marginal discrepancy of conical telescope outer crown with Co-Cr-Ti alloy(Dentitan) and to compare the marginal discrepancy and the retention force of outer crowns using different pattern materials (plastic foil, casting wax, pattern resin). To evaluate the effects of investing conditions on the marginal discrepancy, patterns with plastic foil were invested under three different liquid/powder ratio conditions using phosphate bonded investment (Univest-nonprecious): standard, 10% decreased and 10% increased. At each liquid/powder ratio condition, metal ring was lined with single or double layers of ceramic ring liner. The marginal discrepancy of outer crown at different investing conditions was measured by x 100 compact measuring microscope(STM5, Olympus, Japan). For measurement of the marginal discrepancy and the retention force of outer crown using different pattern materials, the investing condition of 10% decreased liquid/powder ratio and double layers of ring liner was selected because this investing condition resulted in the best fit of outer crown. Marginal discrepancy was measured in the same way above and retention force on universal testing machine. Under the conditions of this study, the following conclusions were drawn: 1. The thickness of ring liner had more influence on the marginal discrepancy of outer crown than the liquid/powder ratio, and the acceptable marginal fitness could not be expected at the investing condition directed by investment manufacturer. 2. There were no differences in the marginal discrepancy of outer crown among three different pattern materials 00.05). 3. Casting wax showed the greatest retention force(1640g) of outer crown, followed by pattern resin(1110g), plastic foil(820g). However, there was no significant difference between plastic foil and pattern resin(p>0.05). 4. Plastic foil showed the least variation in marginal discrepancy and retention force.
Alloys* ; Ceramics ; Crowns* ; Investments ; Plastics ; Telescopes*

No abstract available.
Odontogenic Cyst, Calcifying* ; Odontoma*

No abstract available.
Odontogenic Cyst, Calcifying* ; Odontoma*

A rare case of tenosynovial giant cell tumor of invading left temporomandibular joint(TMJ) extending the middle cranial fossa is reported. Report of this entity in the temporomandibular joint is rare. A 39-year old male patient presented with mild discomfort and swelling in preauricular area. MR image demonstrated a destructive lesion of the left TMJ, with bony erosion of temporal bone and extension into middle cranial fossa. The patient underwent radiotherapy as adjuvant therapy to prevent recurrence, followed by resection. The histological and radiological features of this tumor are discussed along with a brief description of the disease entity.
Adult ; Cranial Fossa, Middle ; Giant Cell Tumors* ; Giant Cells* ; Humans ; Male ; Radiotherapy ; Recurrence ; Temporal Bone ; Temporomandibular Joint*

The present study was performed in order to investigate the correlation among the number of T zone histiocytes, the clinicopathologic parameters and the patient's survival. The subjects in this study were 131 advanced gastric carcinomas including 86 follow-up cases and 41 early gastric carcinomas. The infiltration of T zone histiocytes into tumor tissues was investigated using the immunohistochemical method with andti s-100 protein, nd the data obtained were evaluated statistically. T zone histiocytes were scattered among the cancer cells and in areas formed clusters within the cancer stroma. These cells were abundantly present in tumor tissues and around lymphoid follicles but were rarely seen in surrounding normal stomach tissue. Analysis of the number of T zone histiocytes showed no correlation between the number of T zone histiocytes and the clinicopathologic features except the degree of lymphocytic infiltration within the advanced and the early gastric carcinomas. Survival of the patients with a marked infiltration of T zone histiocytes in stage III was longer than that with mild infiltration of T zone histiocytes, but there was no statistical significance(P value=0.084). Multivariate regressio analysis revealed that the depth of invasion(P value=0.0074) and the lymphocytic infiltration(P value=0.0152) were the important prognostic factors. The results indicate that good prognosis is expected in cases with less deep invasion and high lymphocytic infiltration, and that the number of T zone histiocytes is in proportio to the degree of lymphocyte infiltration within the tumor, although not directly correlated with the patient's survival.

Pott's paraplegia has been frequently serious complication of tuberculous spondylitis, although antituberculous drugs have improved the prognosis and healing of the disease. There are much controvercy on treatement of Pott's paraplegia, which comprises immobilization with or without anterolateral antituberculous drugs, immobilization and early posterior arthrodesis, anterolatear decompression and radical anterior decompression with anterior spinal fusion. The method of anterior decompression and anterior interbody fusion which was introduced by Hdgson since 1956 has good reults. The author analyzed 27 consecutive cases of Pott's parsplegia operated at orthopedic departement, In Je Paik Hospital from May 1980 to August 1988. The results were as follows, 1. Number of cases in child was nine(33%), both sexes were similar. 2. Regions of spine involved were most common at thoracic spine(62%). Number of affected vertebrae was averaged 3.3 vertebrae. 3. There were nineteen early(70%) and eight late(30%) paraplegia. 4. There were two complete and twenty five incomplete paraplegia. 5. In operative finding, inflammatory products and sequestrated material was extrinsic factor in early in paraplegia. 6. The recovery of the paraplegia occur in twenty cases(74%) 7. The recovery of paraplegia after treatment was far better in type of early onset, type of incomplete paraplegia less than one year duration. 8. The radical anterior decompression and anterior interbody fusion was considered as recommendable method for remove of all pathologic foci, recovery of paraplegia and healing the tuberculosis with stability.
Arthrodesis ; Child ; Decompression ; Humans ; Immobilization ; Methods ; Orthopedics ; Paraplegia ; Prognosis ; Spinal Fusion ; Spine ; Spondylitis ; Tuberculosis ; Tuberculosis, Spinal

graft as a successful procedure that provides functional stabiIity. Complications reported include arthro5brosis, patellofemoral joint pain, patellar tendinitis, patellar tendon rupture, recurrent laxity, posterolateral instabi5ty, medial subluxation of the patella, chronic knee pain and painful neuroma. Among them, anterior knee pain was the rnost frequent eomplication. Authors performed arthroscopy assisted one tunnel technique for reconsction of the ACL using autogenous Bone Patellar tendon-Rone (BPTB) in 87 patients. Patients were divid@d into two groups based on the harvested side (knee) of the BPTB. Group 1 consisted of 45 cases of ipsilateral side and group 2 consisted of 42 cases of contralsteral side in harvesting the BPTB. The patients were foll4wed up for at least 12 months to determine whether using the BPTB harvested from the contralateral knee wguld reduce the anterior knee pain at the ACL reconstructed knee. Althaugh there were no statistically signifiqant differences between group 1 and 2 with regard to anterior knee pain, the prevalence of the anterior knee pain was less frequent in group 2 than group 1. This study showed that using the contralateral side harvested autogenous patellar tendon would be a possible protector for anterior knee pain and assists for early rehabilitation.
Anterior Cruciate Ligament Reconstruction* ; Anterior Cruciate Ligament* ; Arthroscopy ; Humans ; Knee ; Neuroma ; Patella ; Patellar Ligament* ; Patellofemoral Joint ; Prevalence ; Rehabilitation ; Rupture ; Tendinopathy ; Transplants

There is a controversy in patella retention or resurfacing in total knee arthroplasty (TKA) till today. Authors studied 52 cases of 45 patients recieved total knee arthroplasty with patella retention (Group 1, twenty-five cases) or patella resurfacing (Group 2, twenty-seven cases) in patients with osteoarthritis. All operations were done by senior surgeon and the implants used were LCS type (33 cases), AMK type (12 cases), Genesis type (5 cases) and Tricon M type (2 cases). The indications of patella retention were small patella, nearly normal articular cartilage, minimal pre-operative patellofemoral pain, poor patellar bone quality and young patients. Patella retention were performed only with LCS prosthesis, which patella groove of the femoral component is deep and anatomical. The operative approaches used were medial parapatella approach in neutral or varus knee and lateral parapatella approch for severe valgus knee and tilting or lateral subluxation of the patella. The mean follow-up period was 24 months (range 12 months to 5 years). The method for clinical evaluation was Hospital for Special Surgery (HSS) knee scoring (consisted of pain, function, range of motion). The method for radiographical evaluation was Knee societys radiologic evaluation system for tibial and femoral alignment, and Keblishs method for patello-femoral congruence. The clinical HSS knee score was average 90.9 points in both groups, and 91.9 points in group 1, 90.0 points in group 2, and there was no statistically difference in HSS knee score between the two groups (P<0.05). The radiologic results had no significant difference in alignment and patello-femoral congruence between the two groups (P<0.05). But the complications were one case of patella fracture, one patella tendon rupture, one anterior instability and two cases of infection in group 2. In conclusion, the results of both groups were satisfactory. We think that it have relation to strict selection of the patients for patella retension and the use of prosthesis that the patella groove of femoral component is deep and anatomical.
Arthroplasty* ; Cartilage, Articular ; Follow-Up Studies ; Humans ; Knee* ; Osteoarthritis ; Patella* ; Patellar Ligament ; Prostheses and Implants ; Rupture

PURPOSE: To compare the pullout strength and insertion torque of proximally tapered screw (PT) with fully tapered screw (FT) and to investigate the correlation between the pullout strength and bone mineral density, morphology of pedicle, and insertion torque of the screw in osteoporotic lumbar spine. MATERIALS AND METHODS: Fifteen osteoporotic lumbar vertebrae from four white human cadavers were used. Bone mineral density, pullout strength and insertion torque were measured by dual energy x-ray absorptiometry, MTS and torque screw driver individually. RESULTS: The FT screw provided greater pullout force and insertion torque than the PT screw in 12 of 15 vertebrae tested (p<0.01). Pullout strength was correlated with insertion torque in PT (r=0.666, P=0.0006) and FT (r=0.464, P=0.19) screws. CONCLUSIONS: Results of this study indicate that the FT screws provide higher pullout strength and insertion torque than PT screws in osteoporotic lumbar spine and suggest that the development of tapered minor diameter may lead to an improved pedicle screw with high pullout strength and insertion torque. Nevertheless, further study is needed to investigate the effect of tapering the minor diameter on the mechanical bending strength of the screw.
Absorptiometry, Photon ; Bone Density ; Cadaver ; Humans ; Lumbar Vertebrae ; Spine* ; Torque

The purpose of present study was to investigate the antimicrobial resistance in Escherichia coli isolated from healthy animals in all provinces of the Republic of Korea. A total of 2,085 E. coli strains isolated from 11,336 fecal samples of healthy animals during 2010-2012 were examined for antimicrobial resistance. Comparison of average resistance rate through the years revealed that tetracycline (47.0% and 76.1%) and streptomycin resistance (42.6% and 64.6%) was most frequently observed in cattle and pigs, respectively. Whereas, in chicken isolates, resistance against nalidixic acid (90.9%) was highest among the antimicrobials tested. Percentage of E. coli that showed multidrug resistance (resistance against > or = three subclasses of antimicrobial agents) was 17.6% (151/860) in cattle, 69.4% (506/729) in pigs, and 86.1% (427/496) in chickens. Overall, the rates of resistance are apparently different between animal species and, in particular, resistance was less prevalent in cattle than in pigs and chickens. In conclusion, this study showed higher prevalence of resistance in commensal E. coli strains to antimicrobial agents in Korean livestock and highlighted the urgent need for measures to regulate the abuse of antimicrobial agents.
Animals ; Anti-Infective Agents ; Cattle ; Chickens ; Drug Resistance, Multiple ; Escherichia coli* ; Livestock ; Nalidixic Acid ; Prevalence ; Republic of Korea ; Streptomycin ; Swine ; Tetracycline