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Overcoming and Preventing Dental Implant Complications: Abutment Fracture Case Report
Kahm, Se Hoon,Kim, Chang-Hyun,Kim, Sung-Joon Korean Academy of Dental Science 2013 Journal of korean dental science Vol.6 No.1
The introduction of osseointegrated dental implants in dentistry brought about a new era in everyday dental practice. For the past 50 years, prosthetic restoration with implant-supported prosthesis has developed into a viable and predictable treatment option. Alongside the increasing use of dental implants is the occurrence of many complications during implant placement (surgery), in the mechanical or prosthetic problem, and in the biological aspect. In particular, abutment or screw fracture as one of the mechanical complications can put the dentist in a tight spot in a clinical situation. It is hard to remove the fractured abutment and screw to restore it properly. Therefore, it is very important that clinicians consider possible complications in advance and make an appropriate treatment plan. We discuss cases of abutment fracture and mechanical/prosthetic complications together with the causes and solutions.
Howard Kahm 계명대학교 한국학연구원 2017 Acta Koreana Vol.20 No.2
After Liberation in 1945, the concept of democracy was introduced to southern Korea through discursively contested representations formulated by the American occupation authorities and Koreans on the political left and right. One of the main fields of contestation was in education as the Americans and Koreans advanced their own interpretations of democratic education that addressed the relationship between the individual and the state. The American perspective on democratic education was grounded in the progressive ideals sweeping the United States. However, progressivism contained an inherent contradiction as it attempted the depoliticization of education while protecting colonial-era collaborators and enforcing anti-communism. The left-wing liberal Korean perspective challenged the social and economic contradictions inherited from the colonial period by critiquing bourgeois individualism in favor of a socially-oriented democratic education. The right-wing conservative Korean position was divided between the New Education movement and democratic nationalist education, but the latter emerged as the dominant education philosophy of the Republic of Korea. Democratic nationalist education under An Ho-sang pushed an ultra-nationalist agenda that submerged individualism in favor of the state but ultimately dismayed the American occupation officials who had previously overseen education reform. The discourse of democracy in the post-Liberation period initiated an evolutionary process of democratic development that has continued through modern Korean history up to the present day.
Determination of implant loading timing: A pilot histomorphometric human study
( Se Hoon Kahm ) 조선대학교 치의학연구원 2014 Oral Biology Research (Oral Biol Res) Vol.38 No.2
Materials and Methods: In this study, GS-II implant (Osstem Co., Korea) was used. GSII implant fixture is a dualthreaded internal connection type with upper microthreads and CellNest surfaces (anodic oxidation treatment). Three early loaded implants groups (5 days, 20 days, 50 days after surgical treatments) and an unloaded implant control group in the edentulous maxilla were retrieved with a 5.0 mm trephine bur. Histomorphometric analysis - percentage of bone-to-implant surface contact (BIC) and bone volume - was perfomed through digital imaging analysis. Results: The histologic data showed that the osseointegration was achieved in both loaded and unloaded conditions. Five days group showed slightly higher BIC and bone volume than other early loaded groups. Unloaded group was failed to compare. Conclusion: Within the limitations of the study, the clinical and radiological results showed that the osseointegration was achieved. Immediate functional loading of implants could lead to favorable bone responses. More studies are needed so that proper and faster way of loading implants can be developed.
Color difference of lithium disilicate ceramic veneer on glazing effect
( Se-hoon Kahm ),( Byoung-jin Lee ),( Min-seock Seo ),( Sung-joon Kim ) 조선대학교 구강생물학연구소 2016 Oral Biology Research (Oral Biol Res) Vol.40 No.3
The purpose of this study was to compare the color difference (ΔE*) of lithium disilicate ceramic veneers with and without glazing. Square specimens 0.6 mm thick were made of the following materials with or without glazing (n=40): IPS e.maxPress and Styleveneers. The color coordinates (CIE L* a* b*) of the specimens were measured with a colorimeter (ShadeEye NCC®). The total color difference (ΔE*) was calculated from the color difference of the materials with and without glazing. Data were analyzed with an unpaired t-test and multiple regression analysis using SPSS 18.0 (p=0.05). The ΔL* of IPS e.maxPress and Styleveneers specimens were -0.35±0.99 and - 0.42±0.78, respectively. The Δa* of these specimens were 0.09±0.16 and -0.01±0.14. The Δb* of these specimens were -1.60±0.84 and -1.22±0.42. The ΔE* of the specimens were 1.95±0.69 and 1.45±0.58. The differences between the products were not statistically different. Multiple regression analysis showed that Δb* and ΔL* improve ΔE*. Within the limitations of this study, we can conclude that the glazing process influences color change of lithium disilicate ceramic veneers.
Color change of lithium disilicate ceramic veneer on different thicknesses with and without glazing
( Se-hoon Kahm ),( Un-chang Heo ),( Sung-joon Kim ) 조선대학교 구강생물학연구소 2017 Oral Biology Research (Oral Biol Res) Vol.41 No.1
The purpose of this study was to compare the translucency and color change of laminate ceramic veneers on different thicknesses before and after glazing. Square-shaped specimens that were 0.3 mm, 0.6 mm and 0.9 mm thick, respectively, were fabricated with the Styleveneers (n=30). The color coordinates (CIE L* a* b*) of the specimens were measured before and after glazing with a colorimeter. For a comparison between the `not glazed` and `glazed` groups and among the thicknesses, data were analyzed with a paired T-test, oneway ANOVA test and multiple regression analysis using SPSS 18.0 (p=0.05). The translucency parameter (TP) of the 0.3 mm- and 0.6 mm-thick specimens showed statistically significant differences before and after the glazing process. The one-way ANOVA of color difference (ΔE*) and change of color coordinate (ΔL*, Δa*, Δb*) were statistically different among samples of different thicknesses. The result of the multiple regression analysis showed that Δb*, ΔL* improve ΔE*. Within the limitations of this study, we conclude that the glazing step changes the translucency of 0.3 mm- and 0.6 mm-thick specimens and the color of lithium disilicate laminate ceramic veneers.
감세훈(Se-Hoon Kahm),현창림(Chang-lim Hyun),김성준(Sung-Joon Kim) 대한치과의사협회 2014 대한치과의사협회지 Vol.52 No.2
Completely avulsed tooth caused by a traumatic injury needs replantation for treatment choice. But, replantated tooth usually comes with inflammatory root resorption, replacement resorption and ankylosis, moreover ankylosis cause severe functional and esthetic problems. The outcome of replantated tooth depends on the following factors; minimal damage to pulp and periodontal tissue, the length of extraoral time, the medium of the tooth stored, the level of root formation and so on. The purpose of this case report is to describe the variable resorption pattern and to discuss types that influence the occurrence of resorption.