Young-Jun Lim

Seoul National University, Sŏul, Seoul, South Korea

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Publications (57)58.55 Total impact

  • Young-Ku Heo · Young-Jun Lim ·
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    ABSTRACT: The degree of misfit between a prosthesis and its supporting implants is a major concern in screw-retained prostheses because it can lead to screw loosening or mechanical failure of implant components. On the other hand, the difficulty of removing subgingival excess cement and the irretrievability of the superstructure are major drawbacks to cement-retained prostheses. A newly designed screw- and cement-retained prosthesis (SCRP) may solve these problems with its passivity, retrievability, and ease in the complete removal of excess cement, giving it the advantages of both screw-retained and cement-retained prostheses. This prosthetic system is mainly composed of a cement-retained framework with screw holes on the occlusal surface and specially designed cementable abutments for multiunit prostheses. The principle and structure of the SCRP system is described in this article.
    The International journal of prosthodontics 11/2015; 28(6):612-614. DOI:10.11607/ijp.4236 · 1.46 Impact Factor

  • 09/2015; 31(3):221-230. DOI:10.14368/jdras.2015.31.3.221
  • Hyo-Sook Ryu · Cheol Namgung · Young-Ku Heo · Jong-Ho Lee · Young-Jun Lim ·
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    ABSTRACT: The aim of this study was to evaluate early-loaded implants supporting a two-unit fixed dental prosthesis in the posterior maxilla and to compare the clinical and radiological outcomes of two different implant systems in terms of success rates, implant stability quotient (ISQ) values, and peri-implant parameters. Thirty patients with the unilateral loss of two consecutive maxillary posterior teeth were randomly assigned to two different implant systems: SLActive Bone level implant (Institut Straumann AG, Basel, Switzerland) in the control group and CMI IS-II active implant (Neobiotech Co., Seoul, Korea) in the experimental group. The patients received provisional and definitive two-unit fixed prostheses at 4 weeks and 6 months after implant surgery, respectively. The peak insertion torque was recorded at surgery. The stability of each implant was evaluated during surgery and at 2, 3, and 4 weeks and 6 and 13 months after implant placement by means of ISQ values. In addition, periapical radiographs and peri-implant parameters were taken throughout the trial. Overall, comparable results were obtained between the control and experimental groups in terms of insertion torque, ISQ values, marginal bone loss, and peri-implant soft tissue parameters. All 60 implants had 100% of success rate. The average insertion torque was 36.83 ± 6.09 (control) and 35.33 ± 3.20 (test) Ncm. The ISQ values remained steady until 4 weeks and then increased with statistical significance during 4 weeks to 13 months after surgery. Both groups exhibited no stability dip during the early phase of healing. The average marginal bone loss from the baseline of implant placement for the control and experimental groups was 0.38 and 0.45 mm after 4 weeks and 0.98 and 0.61 mm after 13 months. All of the soft tissue parameters were within normal limits. The results of this study indicate that the concept of early loading at 4 weeks after placement in the posterior maxilla can be an effective treatment option, even in the areas of low bone density, when implants satisfy the inclusion criteria of minimum insertion torque and ISQ of 30 Ncm and 65, respectively. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
    Clinical Oral Implants Research 07/2015; DOI:10.1111/clr.12667 · 3.89 Impact Factor
  • Hyo-Sook Ryu · Yoon-Il Kim · Bum-Soon Lim · Young-Jun Lim · Sug-Joon Ahn ·
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    ABSTRACT: Decontamination by adjunctive antiseptic agents such as chlorhexidine (CHX) is often recommended for the treatment of peri-implant infections. However, its action on the titanium implant surface needs further research. This study was designed to evaluate the ability of modified titanium surfaces to release chlorhexidine after periodic CHX exposure. Four titanium surfaces were prepared: no surface treatment control (machined surface, MA), an acid mix of 10% HNO3 and 5% HF (HNF), resorbable blast media (RBM), and sandblasting and acid etching (SLA). Each surface was analyzed using a confocal laser scanning microscope and a scanning electron microscope (SEM). Each sample was incubated with whole saliva or phosphate-buffered saline (PBS) for 2 hours. Measurements of CHX release were performed using spectrometry on days 1, 2, and 5 after 1-min exposure to 0.5 % chlorhexidine digluconate solution during a 5-day cycle. CHX-releasing experiments were repeated three consecutive times. The antimicrobial activity of CHX-adsorbed disks was determined by a disk diffusion test using Streptococcus gordonii. The CHX-adsorbed titanium surfaces exhibited a short-term release of CHX and CHX levels dropped rapidly within 3 days. SLA and RBM with smaller and narrower depressions released more CHX than HNF and MA, specifically in the saliva-coated group. The disk diffusion test revealed that after CHX uptake, saliva-coated SLA and RBM showed the highest antimicrobial activity. This study suggests that CHX release is significantly influenced by titanium surface modifications and SLA and RBM might provide effective CHX uptake capacity in the saliva-filled oral cavity.
    Journal of Periodontology 07/2015; 86(11):1-16. DOI:10.1902/jop.2015.150075 · 2.71 Impact Factor
  • Jong-Hoon Choi · Young-Jun Lim · Won-Jin Lee · Jung-Suk Han · Seung-Pyo Lee ·

    06/2015; 31(2):112-125. DOI:10.14368/jdras.2015.31.2.112
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    Jae-Woong Yeon · Young-Jun Lim · Ho-Beom Kwon · Myung-Joo Kim ·
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    ABSTRACT: This report describes the prosthetic treatment of a patient with multiple missing teeth. Installation of five fixtures on maxilla with sinus lift and six fixtures on mandible with ramal bone graft were performed. With implant supported all-ceramic with zirconia core using CAD/CAM technology and porcelain-fused-to-gold prosthesis, treatment with positive outcome which satisfies both functional and esthetical aspect was obtained.
    The Journal of Korean Academy of Prosthodontics 01/2015; 53(1):81. DOI:10.4047/jkap.2015.53.1.81
  • Cheol Namgung · Jong-Ho Lee · Kee-Yeon Kum · Young-Jun Lim ·

    12/2014; 30(4):307-314. DOI:10.14368/jdras.2014.30.4.307
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    Hyo-Sook Ryu · Cheol Namgung · Jong-Ho Lee · Young-Jun Lim ·
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    ABSTRACT: Implant success is achieved by the synergistic combination of numerous biomechanical factors. This report examines the mechanical aspect of implants. In particular, it is focused on macrodesign such as thread shape, pitch, width and depth, and crestal module of implants. This study reviews the literature regarding the effect of implant thread geometry on primary stability and osseointegration under immediate loading. The search strategy included both in vitro and in vivo studies published in the MEDLINE database from January 2000 to June 2014. Various geometrical parameters are analyzed to evaluate their significance for optimal stress distribution, implant surface area, and bone remodeling responses during the process of osseointegration.
    The journal of advanced prosthodontics 12/2014; 6(6):547-54. DOI:10.4047/jap.2014.6.6.547 · 0.64 Impact Factor
  • Ki-Seong Kim · Jung-Suk Han · Young-Jun Lim ·
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    ABSTRACT: Purpose: The aim of this study was to evaluate and compare the settling of abutments into implants and the removal torque values (RTVs) before and after cyclic loading. Materials and methods: Five different implant-abutment connections were tested: Ext = external butt joint + two-piece abutment; Int-H2 = internal hexagon + two-piece abutment; Int-H1 = internal hexagon + one-piece abutment; Int-O2 = internal octagon + two-piece abutment; and Int-O1 = internal octagon + one-piece abutment. Ten abutments from each group were secured to their corresponding implants (total n = 50). All samples were tested in a universal testing machine with a vertical load of 250 N for 100,000 cycles of 14 Hz. The amount of settling of the abutment into the implant was calculated from the change in the total length of the implant-abutment sample before and after loading, as measured with an electronic digital micrometer. The RTV after cyclic loading was compared to the initial RTV with a digital torque gauge. Statistical analysis was performed at a 5% significance level. Results: A multiple-comparison test showed specific significant differences in settling values in each group after 250 N cyclic loading (Int-H1, Ext < Int-H2 < Int-O2 < Int-O1). There were statistically significant decreases in RTVs after loading compared to the initial RTVs in the Int-H2 and Int-O2 groups. No statistically significant differences were found in the Ext, Int-H1, and Int-O1 groups. Conclusion: The results of this study demonstrated that the settling amount and RTV (loss of preload) after cyclic loading were specific to the abutment type and related to the design characteristics of the implant-abutment connection.
    The International journal of oral & maxillofacial implants 09/2014; 29(5):1079-1084. DOI:10.11607/jomi.3383 · 1.45 Impact Factor
  • Chonghwa Kim · Jong-Yub Kim · Young-Jun Lim ·
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    ABSTRACT: Computer-assisted design/computer-assisted manufacturing (CAD/CAM) technology has been widely used in the field of dentistry. Among CAD/CAM custom abutments, zirconia abutments are becoming more popular due to their favorable mechanical and esthetic properties. However, recent review articles show that fractured zirconia abutments are a common prosthetic complication. In this clinical report, a 72-year-old patient presented with a dislodged implant-supported fixed prosthesis because of fractured zirconia abutments. This clinical report describes a successful application of CAD/CAM technology to fabricate duplicate abutments, which were retrofitted to the existing prosthesis.
    The Journal of prosthetic dentistry 04/2014; 112(3). DOI:10.1016/j.prosdent.2014.01.023 · 1.75 Impact Factor
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    Ji-Yung Kwon · Chang-Whe Kim · Young-Jun Lim · Ho-Beom Kwon · Myung-Joo Kim ·
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    ABSTRACT: The aim of the present study was to evaluate the accuracy of three techniques for correction of cast implant bars. Thirty cast implant bars were fabricated on a metal master model. All cast implant bars were sectioned at 5 mm from the left gold cylinder using a disk of 0.3 mm thickness, and then each group of ten specimens was corrected by gas-air torch soldering, laser welding, and additional casting technique. Three dimensional evaluation including horizontal, vertical, and twisting measurements was based on measurement and comparison of (1) gap distances of the right abutment replica-gold cylinder interface at buccal, distal, lingual side, (2) changes of bar length, and (3) axis angle changes of the right gold cylinders at the step of the post-correction measurements on the three groups with a contact and non-contact coordinate measuring machine. One-way analysis of variance (ANOVA) and paired t-test were performed at the significance level of 5%. Gap distances of the cast implant bars after correction procedure showed no statistically significant difference among groups. Changes in bar length between pre-casting and post-correction measurement were statistically significance among groups. Axis angle changes of the right gold cylinders were not statistically significance among groups. There was no statistical significance among three techniques in horizontal, vertical and axial errors. But, gas-air torch soldering technique showed the most consistent and accurate trend in the correction of implant bar error. However, Laser welding technique, showed a large mean and standard deviation in vertical and twisting measurement and might be technique-sensitive method.
    The journal of advanced prosthodontics 02/2014; 6(1):39-45. DOI:10.4047/jap.2014.6.1.39 · 0.64 Impact Factor
  • Yeon-Wha Baek · Young-Jun Lim · Jong-Ho Lee · Hyo-Sook Ryu ·
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    ABSTRACT: The aim of this report is to present and discuss the clinical procedure of an implant-supported removable partial denture for a partially edentulous patient who exhibited a severely resorbed ridge and a collapsed vertical stop. The 67-year-old partially edentulous patient presented with a lack of vertical stop and an advanced transverse arch discrepancy. For the maxilla, an implant-supported removable partial denture was fabricated on bilateral distal implant abutments. The mandibular arch was restored with an implant-supported fixed partial denture, since it was expected to function more properly than a removable partial denture. This clinical report demonstrates a successful treatment approach to restore oral function and appearance for the patient.
    Quintessence international (Berlin, Germany: 1985) 01/2014; 45(4). DOI:10.3290/j.qi.a31334 · 0.73 Impact Factor
  • Joon-Seok Lee · Young-Jun Lim ·
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    ABSTRACT: The aims of this clinical report were to present and discuss the clinical procedure and the treatment considerations of prosthetic rehabilitation after myofascial flap surgery. A 78-year-old edentulous woman with a squamous cell carcinoma underwent hemimaxillectomy. A temporalis myofascial flap surgery combined with implant-supported prosthesis is one successful approach to the restoration of oral function after hemimaxillectomy. Although the bulky and mobile nature of a temporalis myofascial flap prevented the retention of a tissue-borne denture, an appropriate impression technique and the fabrication of implant-supported prosthesis using an implant attachment system enhanced the overall satisfaction by the patient.
    The Journal of craniofacial surgery 01/2014; 25(2). DOI:10.1097/SCS.0b013e3182a2b7a5 · 0.68 Impact Factor
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    Cheol Namgung · Myung-Joo Kim · Ho-Beom Kwon · Young-Jun Lim ·
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    ABSTRACT: It will be possible to predict the success and failure of the prosthodontic treatment and prevent clinical complications if the oral environment including prostheses and their supporting teeth and periodontium can be monitored in real time. The aim of this report is to introduce the concept of a smart prosthesis, which monitors specific factors in the oral cavity, and investigate its feasibility through a literature review of MEMS (Micro-electro-mechanical System) and Biosensing.
    09/2013; 29(3). DOI:10.14368/jdras.2013.29.3.290
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    Yeon-Wha Baek · Young-Jun Lim · Myung-Joo Kim · Ho-Beom Kwon ·
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    ABSTRACT: Recently, the demand for esthetic improvement by a treatment neither time consuming nor invasive is increasing. The patient wanted the maxillary anterior teeth appearance to be improved by prosthetic treatment, not other treatments such as orthodontic, periodontal, and endodontic treatments, despite the limit of esthetic improvement. In this case, among the recent variety of all ceramic systems for the aesthetic prosthetic restoration, we selected the zirconia-based system as a method of restoration in order to conceal the discoloration of teeth. The patient was satisfied with the esthetic results.
    03/2013; 29(1). DOI:10.14368/jdras.2013.29.1.095
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    ABSTRACT: The purpose of this investigation was to measure the accuracy of digital impressions (DIs) compared to conventional impressions (CIs). Using the iTero system, a master cast was scanned to produce stereolithography dies. As a control group, silicone impressions were taken and poured using stone. The resulting stereolithography and stone dies were scanned and overlayed on the scanned reference image of the master cast. The mean (± standard deviation) dimensional difference to the master cast was 23.9 (± 17.6) ?m for DIs and 17.6 (± 45.6) μm for CIs. The results indicate that DIs also provides enough accuracy for clinical application.
    The International journal of prosthodontics 03/2013; 26(2):161-163. DOI:10.11607/ijp.3014 · 1.46 Impact Factor
  • Jeong-Ki Joo · Young-Jun Lim · Ho-Beom Kwon · Sug-Joon Ahn ·
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    ABSTRACT: Objective: The aim of the present study was to analyze the changes in the gonial angle, ramus height, condyle height and cortical bone thickness in relation to gender and dental status in elderly patients. Materials and methods: The study population comprised 240 patients (age ranged from 60-69 years) who had digital panoramic radiographs taken for various purposes. One group consisted of 120 patients, 60 men and 60 women, who had all natural teeth present except for third molars. The second group consisted of the remaining 120 patients (60 men and 60 women) who were in a completely edentulous state (maxilla and mandible). The gonial angle, ramus height, condylar height and cortical bone thickness of the mandible were measured by computer software on their panoramic radiographs. Results: Women showed larger gonial angles than men, while men had greater cortical bone thickness and ramus height (p < 0.05). However, no significant difference in condylar height was found between both genders (p > 0.05). Edentulous subjects had a larger gonial angle than dentate subjects, while dentate subjects had greater cortical bone thickness on both sides and left side of condylar height (p < 0.05). The gonial angle had statistically negative correlations with cortical bone thickness and ramus height, regardless of gender. Conclusions: The outcomes of the present study indicate that the edentulous women undergo morphological changes of the mandible influenced by the dental status more than men.
    Acta odontologica Scandinavica 07/2012; 71(2). DOI:10.3109/00016357.2012.690446 · 1.03 Impact Factor
  • Jeong-Eun Lee · So-Yoon Park · Young-Il Chang · Young-Jun Lim · Sug-Joon Ahn ·
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    ABSTRACT: The purpose of this study was to investigate the ultraviolet-light-induced photocatalytic bactericidal effects of titanium surfaces on Streptococcus sanguinis in the presence of saliva-coating. Three different titanium disks were prepared: machined (MA), heat-treated (HT), and anodized surfaces (AO). Each disk was incubated with whole saliva or phosphate-buffered saline for 2 h. Antibacterial tests were performed by incubating a S. sanguinis suspension with each disk for 90 or 180 min under ultraviolet (UV) illumination. The viable counts of bacteria were enumerated from the cell suspension and the UV-light-induced photocatalytic bactericidal effects were determined by the bacterial survival rate. Without saliva-coating, AO disks exhibited significantly decreased bacterial survival rates compared to MA disks. The bacterial survival rates of the HT disks were intermediate between MA and AO in the absence of saliva-coating. However, saliva-coating significantly increased bacterial survival rates in all surface types. There was no significant difference in bacterial survival rates among the three surface types after saliva-coating. This study suggests that Ti-based antibacterial implant materials using TiO2 photocatalyst may have a limitation for intraoral use.
    Applied Surface Science 07/2012; 258(18):6841–6845. DOI:10.1016/j.apsusc.2012.03.114 · 2.71 Impact Factor
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    ABSTRACT: The poly-ether-ether-ketone (PEEK) polymer is of great interest as an alternative to titanium in orthopedics because of its biocompatibility and low elastic modulus. This study evaluated the fatigue limits of PEEK and the effects of the low elastic modulus PEEK in relation to existing dental implants. Compressive loading tests were performed with glass fiber-reinforced PEEK (GFR-PEEK), carbon fiber-reinforced PEEK (CFR-PEEK), and titanium rods. Among these tests, GFR-PEEK fatigue tests were performed according to ISO 14801. For the finite element analysis, three-dimensional models of dental implants and bone were constructed. The implants in the test groups were coated with a 0.5-mm thick and 5-mm long PEEK layer on the upper intrabony area. The strain energy densities (SED) were calculated, and the bone resorption was predicted. The fatigue limits of GFR-PEEK were 310 N and were higher than the static compressive strength of GFR-PEEK. The bone around PEEK-coated implants showed higher levels of SED than the bone in direct contact with the implants, and the wider diameter and stiffer implants showed lower levels of SED. The compressive strength of the GFR-PEEK and CFR-PEEK implants ranged within the bite force of the anterior and posterior dentitions, respectively, and the PEEK implants showed adequate fatigue limits for replacing the anterior teeth. Dental implants with PEEK coatings and PEEK implants may reduce stress shielding effects. Dental implant application of PEEK polymer-fatigue limit and stress shielding.
    Journal of Biomedical Materials Research Part B Applied Biomaterials 05/2012; 100(4):1044-52. DOI:10.1002/jbm.b.32669 · 2.76 Impact Factor
  • Joon-Seok Lee · Young-Jun Lim ·
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    ABSTRACT: Lower survival rates were observed for the implant placed in the anterior maxilla. The purpose of this study was to investigate the influence of different implant lengths on the stress distribution around osseointegrated implants under a static loading condition in the anterior maxilla using a three-dimensional finite element analysis. The diameter of 4.0 mm external type implants of different lengths (8.5 mm, 10.0 mm, 11.5 mm, 13.0 mm, 15.0 mm) was used in this study. The anterior maxilla was assumed to be D3 bone quality. All the material was assumed to be homogenous, isotropic and linearly elastic. The implant-bone interface was constructed using a rigid element for simulating the osseointegrated condition. Then, 176 N of static force was applied on the middle of the palatoincisal line angle of the abutment at a 120°angle to the long axis of abutment. The von Mises stress value was measured with an interval of 0.25 mm along the bone-implant interface. Incremental increase in implant length causes a gradual reduction of maximum and average von Mises stress at the labial portion within the implant. In the bone, higher stress was concentrated within cortical bone area and more distributed at the labial cortex, while cancellous bone showed relatively low stress concentration and even distribution. An increase in implant length reduced stress gradients at the cortical peri-implant region. Implant length affects the mechanisms of load transmission to the osseointegrated implant. On the basis of this study the biomechanical stress-based performance of implants placed in the anterior maxilla improves when using longer implants.
    Computer Methods in Biomechanics and Biomedical Engineering 03/2012; 16(11). DOI:10.1080/10255842.2012.654780 · 1.77 Impact Factor

Publication Stats

244 Citations
58.55 Total Impact Points


  • 2004-2014
    • Seoul National University
      • • Dental Research Institute
      • • Department of Dentistry
      • • College of Dentistry
      Sŏul, Seoul, South Korea
  • 2012
    • Dankook University
      • College of Dentistry
      Yŏng-dong, North Chungcheong, South Korea
  • 2009
    • Sungkyunkwan University
      • Samsung Medical Center
      Seoul, Seoul, South Korea