• Restorative Dentistry and Endodontics
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• v.7 no.1
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• pp.17-24
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• 1981

The purpose of this study is to compare the shape of the apical regions of root canals after instrumentation by various enlarging instruments. 120 extracted, single-rooted human teeth were seperated into 4 experimental groups. Each group provided 30 teeth for experimental use. Group 1 root canals instrumented by the hand-operated Reamer. Group 2 root canals instrumented by the hand-operated H-file. Group 3 root canals instrumented by the hand-operated K-file. Group 4 root canals instrumented by the automated Giromatic file. The results were as follows: 1. The degree of the roundness of the apical regions of root canal walls: 1) Hand-operated instruments were superior to the automated Giromatic file. 2) The Reamer was the most effective instrument among hand-operated instruments 3) There was little difference between the H-file and the K-file. 2. The degree of the smoothness of the apical regions of root canal walls: 1) Root canal walls instrumented by the hand-operated Reamer, H-file and, K-file were generally smooth, and there was little difference among them. 2) Root canal walls instrumented by the automated Giromatic file showed many irregular canal walls. 3. The existance of organic debris in the apical regions of root canals: All organic debris is not removed from root canals, and there was little difference between hand-operated instruments and the automated Giromatic instrument in removing organic debris.

• Journal of the Korean Arthroscopy Society
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• v.7 no.2
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• pp.176-182
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• 2003

Purpose : The purpose of this study is to describe the surgical technique of ACL reconstruction with the flexible reamer and evaluate the clinical results of this method. Materials and Methods : Twenty four patients who followed for 12 months were included. The results were evaluated by Lachman test, KT-2000 arthrometer, Lysholm score, and postoperative roentgenogram of the knee. Results : The range of motion of the affected knee was acceptable except one case(10 to 90 degree) and at the last follow up, two cases were positive in Lachman test. Mean Lysholm knee scoring scale was 63.7 point preoperatively and 91.4 point at the last follow up. The results of KT-2000 arthrometer was 6.6mm preoperatively and 1.5mm at the last follow up. In operative time, there were decrease of mean 13.5 minute than ACL reconstruction without the flexible reamer, Conclusion : ACL reconstruction with the flexible reamer achieves the ideal isometric point of tibia and femur with no difficulty, proper notchplasty preventing from the impingement, and lessens the operative time.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.6
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• pp.599-606
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• 2019

In this study, it was aimed to find the optimal cutting conditions by measuring and analyzing the dimensional accuracy of SNCM 616 alloy steel, which is commonly used in industry, by precision hole machining using Ø25 mm and 8-blade reamer in CNC-HBM to be. As a result of the roundness and dimensional accuracy, it was found that the spindle speed had a significant effect on the dimensional tolerance value. Optimum cutting conditions are spindle speed 25 rpm and feed rate 20 mm / min.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.6
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• pp.607-613
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• 2019

In this study, we investigate the effect of SNCM616 alloy steel, which is commonly used in industry, such as rotors and crank-shafts, on the surface roughness of CNC HBM with Ø25 mm, 8-blade reamer to objective is to analyze and present optimal cutting conditions. The higher the feedrate for the spindle speed, the rougher the surface roughness. The surface roughness was found to be better when the feed rate was lower. The resultant value of the most accurate surface roughness is Ra 0.756 ㎛, and the optimal cutting conditions are 25 rpm at spindle speed and 20 mm/min at transfer speed.

• Journal of the Korean Arthroscopy Society
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• v.12 no.1
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• pp.18-23
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• 2008

Purpose: The purpose of this study is to evaluate the clinical results of the function and stability of ACL reconstruction using the flexible reamer. Materials and Methods: We reviewed 98 patients who taken ACL reconstruction using the flexible reamer from March, 1999 to May, 2004. And the follow-up period was more than 12 months in all cases. We used the subjective tests including Lysholm knee score and 2000 International Knee Documentation Committee(IKDC) subjective knee score, and the objective tests such as anterior drawer test, Lachman test, pivot shift test, and KT-2000 arthrometer to evaluate the clinical results. Results: In the range of motion of the affected knee, the extension deficit more than 5 degree was 8 cases preoperatively and 1 case postoperatively. The flexion deficit more than 5 degree was 12 cases preoperatively and 2 cases postoperatively. The mean Lysholm knee score was 61.3 point(${\pm}3.5$ SD) preoperatively and 87.7 point(${\pm}2.0$ SD) postoperatively. The mean 2000 International Knee Documentation Committee(IKDC) subjective knee score was 49 point(${\pm}3.3$ SD) preoperatively and 84 point (${\pm}2.2$ SD) postoperatively. 93 cases were more than grade II in Lachman test preoperatively and 5 cases postoperatively. 71 cases were more than grade II in pivot shift test preoperatively but 89 cases were negative postoperatively. The mean maximal manual difference by KT-2000 arthrometer was 6.8 mm(${\pm}1.9$ SD) preoperatively and 1.8 mm(${\pm}0.8$ SD) postoperatively. Conclusion: ACL reconstruction using the flexible reamer achieved the ideal isometric point of femur and anatomic graft placement, so we could obtain good results, especially in rotational stability.

• Journal of the Korean Arthroscopy Society
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• v.13 no.1
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• pp.82-85
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• 2009

Purpose: In anterior cruciate ligament (ACL) reconstruction, preservation of the remnant original tissue might promote graft healing and be helpful in proprioception. But this procedure is difficult and causes the notch impingement. So we introduce a surgical technique that makes a transtibial femoral tunnel at 10 or 2 o'clock position with preservation of remnant tissue. Surgical approach: We tried to preserve the remnant tissue and synovium as much as possible, especially those of tibial attachment and extending to the posterior cruciate ligament (PCL), so as to have some tension and to prevent notch impingement. We set the tibial drill guide at 40~45 degrees and the intra-articular guide tip was 1 mm anterior and medial to the conventional site. The starting point of tibial guide pin was proximal to the pes anserinus and anterior to the medial collateral ligament. When the reamer approached the cortical bone of the tibial articular surface, the reamer must be advanced very carefully to minimize injury to the remnant tissue. The tibial and femoral tunnel at 10 or 2 o'clock position were made with the reamer, the diameter of which was same with that of the graft. Conclusion: We report a remnant preserving technique in ACL reconstruction that makes a transtibial femoral tunnel at 10 or 2 o'clock position

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.9-10
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• 2006

본 논문은 기존 Reamer Bolt 사용시 발생하는 여러 가지 문제점를 해결하고 고가의 수입품을 대체하기 위한 유압식 커플링 볼트의 국산화를 소개하였다.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.11 no.1
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• pp.10-16
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• 2002

This study is to evaluate the tool performance in honing using diamond reamer and present grounds whether the localized products are sufficiently competitive comparing with the existing imported ones. The heads of the tool performance evaluation are roundness, roughness, tool life of the workpiece and so on. When evaluating the tool performance, cutting process is divided by three areas which are rough semi-finish and finish cut. cloning improves the accuracy such as boring and reaming after manufacturing the inside diameter, and finishing directly by honing is a recent trend. This honing is used greatly In hard cutting materials like cemented carbides and it is the CBN and diamond that is used in hard cutting materials. Both of them are expensive and most oi them are imported.

• Proceedings of the KACD Conference
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• 2001.11a
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• pp.565.1-565
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• 2001

This study aimed to compare the efficiency of propylene glycol (PG) and distilled water (DW) as vehicles that would allow diffusion of dye through the root canal system. Human maxillary central incisors were chosen and de-crowned. After enlarging the upper part of the root canal with a Peeso reamer, cementum covering the upper third of the root was removed. The roots were ultrasonically irrigated with 5% NaOCI to remove smear layer.(omitted)

• Restorative Dentistry and Endodontics
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• v.10 no.1
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• pp.193-198
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• 1984

This study was conducted to compare the chip removal capability of root canal enlarging instruments. Fifty five buccal or mesial canals from upper and lower molar teeth were randomly selected and divided into three groups; Reamer, K-type file and K-flex file. Fifteen canals in each group were individually enlarged with one of three tested instruments and irrigated with 5cc of normal saline solution. After instrumentation, each canal was dried with paper point and the canal was splited longitudinally and the cleanness of root canal surface was evaluated under stereoscope by three observers. The results were as follows; 1. Most of the canals experimented showed varying degree of the presence of debris. 2. The canals prepared with reamers showed the most clean canal surface. 3. There was no significant difference in debridement effect between k-type file and k-flexfile.