Jeong Keun Lee

Ajou University, Sŏul, Seoul, South Korea

Are you Jeong Keun Lee?

Claim your profile

Publications (7)3.16 Total impact

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Purpose: This study evaluated the prognosis of conservative and surgical treatment according to the staging of bisphosphonate-related osteonecrosis of jaw (BRONJ) by American Association of Oral and Maxillofacial Surgeons and American Society for Bone and Mineral Research. Methods: We evaluated 53 patients of BRONJ who visited Department of Dentistry, Ajou University School of Medicine from May 2007 to February 2013. Twenty eight patients in stage 2, were divided into surgical and conservative groups with cessation of bisphosphonate therapy. Fifteen patients belonged to the conservative treatment group, in which mouth rinsing and antibiotics medication were done. Thirteen patients were treated with debridement or sequestrectomy, in the surgical treatment group. Each study list was analyzed by SPSS ver. 14.0 (SPSS Inc., USA) software and the favorable rate was verified by the Fisher exact test. P-values less than 0.05% were deemed significant. Results: Clinical outcome was evaluated on the basis of both clinical and radiographic findings. Of all the 28 patients of stage 2, 15 patients underwent conservative treatment and 13 patients received surgical treatment. In the surgical group, 9 of 13 (69.2%) showed good prognosis, 4 of 13 (30.7%) showed recurrence. In the conservative group, 13 of 15 (86.6%) showed no change duting the follow-up period. Two of 15 patients even showed a bad prognosis, such as pain and pus discharge, which are criteria for stage 3. P-value was 0.067 (>0.05). Conclusion: The results of the present study suggests that surgical intervention is good choice against the conservative treatment, after proper drug holidays period, while further investigation is needed for a definite solution to BRONJ.
    Maxillofacial Plastic and Reconstructive Surgery. 01/2013; 35(5).
  • Source
    Min Woo Han, Jeong Keun Lee
    [Show abstract] [Hide abstract]
    ABSTRACT: Purpose: This study is to evaluate the efficacy of the autogenous tooth bone graft material, clinically and radiologically, as related to implant installation. Methods: In oral and maxillofacial surgery department of Ajou University Hospital, guided bone regeneration (GBR), implant placement combined with GBR, sinus graft, implant placement combined with sinus graft, and defect filling were performed in 46 patients, using autogenous tooth bone. Among these, 66 implants were inserted with autogenous tooth bone. Implant stability quotient (ISQ) was measured by Osstell Mentor (Integration Diagnostics, Goteborg, Sweden) on 39 implants on the operation date and 4 months later, and on 21 implants 9months on the average at the final setting of restoration. Twenty-eight implants with GBR and sinus graft (GBR group: n=14, sinus graft group: n=14) were evaluated radiologically to measure the resorption of grafted autogenous tooth bone after loading. Results: The average initial stabilization of the installed implants was 67 ISQ, and the average secondary stabilization at 4 months later was 76. The average bone loss of GBR group as measured 8.0 months after application of prosthesis loading was 0.29 mm and the average bone loss of the sinus graft group as measured 7.6 months after application of prosthesis loading was 0.66 mm, respectively. In the histological assessment, formation of the new bone and continuous trabecular bone pattern was identified around autogenous tooth bone. Conclusion: Based on these results, we concluded that autogenous tooth bone is an excellent bone graft material that can substitute the autogenous bone.
    Maxillofacial Plastic and Reconstructive Surgery. 01/2013; 35(4).
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Purpose: Maxillary sinus elevation has been widely used to enable insertion of endosseous implants in severely resorbed maxilla. Maxillary sinusitis after this procedure was considered to be the major drawback, therefore, preoperative evaluation of paranasal sinus is considered to be important. In order to evaluate the condition of the sinus, we used Waters' projection. In this study, asymptomatic patients were evaluated by Waters' view, and compared to timing to assess the sinus cavity. Methods: The retrospective study was based on 14 patients who were performed sinus elevation surgery in Seoul National University Dental Hospital. These patients did not show any signs of maxillary sinusitis. These patients were taken Waters' view at preoperative, postoperative 1 day, 3 months, 6 months. In Waters' view, presence of air fluid level, radiopacity of sinus wall, or radiopacity of entire maxillary sinus were evaluated. The density, and sinus dimension changes were assessed using Adobe Photoshop CS5 (Adobe Systems Inc., San Jose, CA, USA). Results: Findings of Waters views in patients with clear maxillary sinus at preoperative time were followed by elevated sinus floor with transplanted bone, mucosal swelling, and air fluid level. At postoperative 3 months, and 6 months, the radiographic findings were similar to preoperative state. By contrast, patients with preoperative mucosal swelling, or haziness in sinus cavity showed radiopacity entire sinus in Waters' view. In cases of the patients who were treated with simultaneous treatment to mucosal swelling, good status of sinus cavity were found. Conclusion: Although Waters' projections provide the limited information, and is less sensitive method compared with computed tomography, it is simple, easy, and economical method to assess of maxillary sinus. We suggest using Waters' view as radiographic routine tool for evaluation of sinus condition, especially in the sinus elevation surgery.
    Maxillofacial Plastic and Reconstructive Surgery. 01/2013; 35(2).
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Purpose: The purpose of this study was to evaluate the feasibility of the outfracture osteotomy sinus graft technique with the evaluation of 8.5 year survival rate of the implants placed in the atrophic edentulous posterior maxillary area. Methods: One hundred and seventy-six cases of 145 patients who visited our center from August 2004 to February 2013 and were diagnosed as atrophic edentulous maxillary alveolar ridge, were selected and underwent sinus graft with outfracture osteotomy sinus graft technique. Feasibility of the outfracture osteotomy sinus graft technique was investigated with clinical and radiographic evaluation to assess the survival rate of the total dental implants in augmentation sinus surgery. Total fixture number available in follow-up period was 320, in which the lost 15 patients were excluded out of 160 patients. Results: Eight point five year cumulative survival rate was 95.6% with 14 failures of total 320 fixtures. The average follow-up period was 28 months 16 days with the minimum and maximum follow-up periods of 4 months 5 days and 94 months 10 days, respectively. Conclusion: Traditional infracture technique is a popular method for an augmentation sinus surgery. The authors modified this classical method by outfracturing and readapting the bony window after sinus graft, with excellent treatment results evidenced by high survival rate, which proves the feasibility of the newly-designed outfracture osteotomy sinus graft technique.
    Maxillofacial Plastic and Reconstructive Surgery. 01/2013; 35(2).
  • Jeong Keun Lee, Young Sook Cho, Seung Il Song
    [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study was to elucidate the relationship of tumor necrosis factor alpha (TNF-alpha) and interleukin 6 (IL-6) to temporomandibular disorder with clinical symptoms such as pain, joint sounds, and mouth opening limitation by analysis of the level of these molecules in the synovial fluid. Twenty-four patients with chief complaints of pain, mouth opening limitation, and clicking sounds were selected as the experimental group and compared with 5 healthy subjects. After joint lavage with arthrocentesis, diluted synovial fluid was collected and enzyme-linked immunosorbent assay was done for analysis of TNF-alpha and IL-6 in 24 experimental patients and 5 healthy subjects. The synovial levels of TNF-alpha and IL-6 were elevated in the experimental group compared with the healthy control group, but no significant correlation was established. The synovial levels of TNF-alpha and IL-6 were elevated in the acute pain group compared with the chronic pain group, but no significant correlation was established. In our analysis of 2 proinflammatory cytokines, TNF-alpha and IL-6, in the synovial fluid of temporomandibular disorder patients with symptoms of pain, mouth opening limitation, and clicking, both were elevated without statistical significance.
    Journal of oral and maxillofacial surgery: official journal of the American Association of Oral and Maxillofacial Surgeons 05/2010; 68(5):1064-8. · 1.58 Impact Factor
  • Jeong Keun Lee
    [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study was to provide feasibility of a new technique of sinus graft: outfracture osteotomy sinus graft. The author modified the window opening method from the original trapdoor technique to an outfracturing and readaptation technique. It provides a few advantages in dental implant treatment of atrophic maxillary posterior edentulous alveolar ridges: 1) in combined cases of height and width problems; 2) in cases with anatomic problems such as sinus septum, thick lateral sinus wall, and intrabony bleedings; 3) possible use of the outfractured bony segment as a covering membrane. The follow-up of 34 patients (40 cases; 6 bilateral cases) revealed good results without a case of graft failure and showed excellent survival and function of the dental implants. The sinus graft technique was modified as the author outfractured and readapted the bony lateral window, with several advantages as mentioned above. This new outfracture osteotomy sinus graft technique has excellent results as an alternative to the original trapdoor technique.
    Journal of oral and maxillofacial surgery: official journal of the American Association of Oral and Maxillofacial Surgeons 04/2010; 68(7):1639-41. · 1.58 Impact Factor
  • Source
    Journal of The Korean Association of Oral and Maxillofacial Surgeons. 01/2010; 36(2).