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.

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 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.

Overcoming and Preventing Dental Implant Complications

Se Hoon Kahm,Chang-Hyun Kim,Sung-Joon Kim 대한치의학회 2013 Journal of korean dental science Vol.6 No.1

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.

탈구치의 치근 흡수

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.

Awareness and assessment of the Material Safety Data Sheet by dental technicians in Jeju province

( Jae-man Woo ),( Chan Woo Jo ),( Se-hoon Kahm ),( Gyeong Pil Moon ),( Jung Kwan Eun ),( Sung-joon Kim ) 조선대학교 치의학연구원(구 조선대학교 구강생물학연구소) 2018 Oral Biology Research (Oral Biol Res) Vol.42 No.3

The purpose of this study was to investigate the furnishing rate and dental technicians’ comprehension level on Material Safety Data Sheet (MSDS) in Jeju province. On-line and off-line questionnaires filled out by 102 dental technicians were acquired and analyzed by frequency analysis, chi-squared test, and one-way ANOVA by SPSS 20.0. On average, respondents rated 3.21±0.87 on a Likert 5-point scale regarding familiarity with hazardous effects of chemicals, 2.54±1.09 to awareness of MSDS, and 2.05±1.09 to familiarity with the contents of MSDS. Regarding availability of MSDS or similar information at workplace, 18.6% responded MSDS were furnished, 5.9% responded similar information sheets were provided, 29.4% responded MSDS or similar information sheets were not furnished, and 46.1% responded that they were not sure. Total of 24.5% responded positive to availability of MSDS or similar information, which was higher than result from a similar study from 2010 but lower than that of the 2016 study. Gender difference in awareness and comprehension level of MSDS were noted. No statistically significant differences were noted between graduates of Jeju and of other regions regarding awareness and comprehension of MSDS. Position at work rather than length of employment affected level of awareness and comprehension of MSDS. Efforts to rouse dental technicians’ interest in chemical safety may enhance workplace health and safety, and there is room for improvement in MSDS provision and education in dental labs of Jeju.

오진된 치성 피부 누공의 진단과 치료

김성준(Sung-Joon Kim),감세훈(Se-Hoon Kahm) 대한치과의사협회 2014 대한치과의사협회지 Vol.52 No.6

The cutaneous sinus tract is an uncommon disease. It is difficult to diagnose exactly of odontogenic cutaneous sinus tract for dentists or dermatologists except experienced clinicians or previously known clinicians. Many patients may be treated with repeated surgical excisions, biopsies, and antibiotic medications, but most of them could be frustrated with the recurrence of disease. There are several methods for diagnosis of odontogenic cutaneous sinus tract such as GP cone tracing, conventional computed tomography(CT), periapical x ray imaging, and cone beam computed tomography(CBCT). This case report describes the diagnosis and treatment of odontogenic cutaneous sinus tract that referred from medical doctors.

치성 피부 누공 환자의 진단과 치료

김성준(Sung-Joon Kim),감세훈(Se Hoon Kahm) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.9

The odontogenic cutaneous fistula in facial area is uncommon but, well defined disease. It is difficult to diagnose from the dental origin of cutaneous sinus tract. Most patients may visit to the dermatologists or general hospital without cause of disease. They usually be treated by repeated surgical excisions, biopsies, and antibiotic medications, but suffered from recurrences. We studied odontogenic cutaneous fistula through retrospective study in Jeju Special Self-Governing Province between 1 January 2009 and 12 December 2015. There were 3 males, 5 females from 14 to 78 years old with an average age of 50.4 years old. Only 2 patients felt the toothache, others didn’t detect it. They suffered from recurrences and repeated treatments for 3 to 11 months with an average period of 7.9 months. They visited average 2.8 hospitals before a precise diagnosis in a dental clinic. All cases were fully healed endodontic treatment or extraction of origin teeth without recurrences. In conclusion, the cause of cutaneous fistula in facial area can be odontogenic. If dentists or doctors diagnose a patient with cutaneous fistula on face, they should check dental problems or take x-ray views for precise diagnosis. It could be helpful for differential diagnosis.

세라믹 비니어의 글레이징에 따른 반투명도 변화

김성준,감세훈,Kim, Sung-Joon,Kahm, Se Hoon 대한치과보철학회 2015 대한치과보철학회지 Vol.53 No.2

목적: 본 연구의 목적은 두 종의 라미네이트 세라믹 비니어의 글레이징 여부에 따른 반투명도 변화를 비교하는데 있다. 재료 및 방법: IPS e.maxPress (IEM)와 Styleveneers (STV)를 대상으로 하여 각각 0.3 mm와 0.6 mm 두께의 한 변이 10 mm인 정사각형 형태의 시편을 글레이징을 시행한 군과 하지 않은 군으로 나누어 제작하였다(n=80). 각 시편은 측색기를 이용하여 색좌표(CIE $L^*a^*b^*$)를 측정하였다. Translucency Parameter (TP)는 측정한 색차를 계산하여 얻었다. 각 제조사별 차이와, 글레이징 여부에 관한 통계 분석을 위해 독립표본 t-test를 시행하였다(P=.05). 결과: IEM의 0.3 mm 두께에서 TP값(평균${\pm}$표준편차)은 글레이징을 시행하지 않은 군에서 $45.99{\pm}3.00$, 글레이징을 시행한 군에서 $49.53{\pm}2.28$이었으며, 0.6 mm 두께에서는 각각 $32.82{\pm}2.59$과 $43.02{\pm}0.98$이었다. 마찬가지로, STV의 0.3 mm 두께에서 TP값은 글레이징을 시행하지 않은 군에서 $47.03{\pm}3.65$, 글레이징을 시행한 군에서 $50.95{\pm}3.05$이었으며, 0.6 mm 두께에서는 각각 $34.48{\pm}1.28$과 $43.39{\pm}1.20$이었다. 세라믹 비니어의 글레이징 여부에 따라, 세라믹 비니어의 TP값은 통계적으로 차이가 나타났다. 그러나 제조사간의 통계적 유의성은 없었다. 결론: 한계는 있지만, 본 연구에서, 라미네이트 세라믹 비니어는 글레이징 과정을 거치면 반투명도가 변화되며, 제조사간의 차이는 없다는 결론을 얻었다. Purpose: The aim of this study was to compare the translucency of two different laminate ceramic veneers with and without glazing. Materials and methods: Ten millimeter side square-shaped specimens in 0.3 mm and 0.6 mm thick were fabricated for the following materials with and without glazing (n=80): A1 shade IPS e.maxPress (IEM) and Styleveneers (STV). The color coordinates (CIE $L^*a^*b^*$) of the specimens were measured with a colorimeter. The Translucency parameter (TP) was calculated from the color difference of the material on a black versus a white background. For comparisons between materials and between the 'not glazed' and 'glazed' groups, unpaired t-test was used to analyze the data (P=.05). Results: The TP ($Mean{\pm}SD$) of 'not-glazed' and 'glazed' group of IEM specimens at 0.3 mm thickness were $45.99{\pm}3.00$ and $49.53{\pm}2.28$ and the TP at 0.6 mm thickness were $32.82{\pm}2.59$ and $43.02{\pm}0.98$, respectively. Likewise, the TP of 'not-glazed' and 'glazed' group of STV specimens at 0.3 mm thickness were $47.03{\pm}3.65$ and $50.95{\pm}3.05$ and the TP at 0.6 mm thickness group were $34.48{\pm}1.28$ and $43.39{\pm}1.20$, respectively. As the glazing of ceramic veneer differed, the TP of each ceramic veneer showed statistically significant difference. But, the result between the products was not statistically different. Conclusion: Within the limitations of this study, we are concluded that the glazing process changed translucency of laminate ceramic veneers and the TP would not be affected by products.