• Journal of Periodontal and Implant Science
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• 제48권2호
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• pp.103-113
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• 2018

Purpose: The purpose of this retrospective study with 4-12 years of follow-up was to compare the marginal bone loss (MBL) between external-connection (EC) and internal-connection (IC) dental implants in posterior areas without periodontal or peri-implant disease on the adjacent teeth or implants. Additional factors influencing MBL were also evaluated. Methods: This retrospective study was performed using dental records and radiographic data obtained from patients who had undergone dental implant treatment in the posterior area from March 2006 to March 2007. All the implants that were included had follow-up periods of more than 4 years after loading and satisfied the implant success criteria, without any peri-implant or periodontal disease on the adjacent implants or teeth. They were divided into 2 groups: EC and IC. Subgroup comparisons were conducted according to splinting and the use of cement in the restorations. A statistical analysis was performed using the Mann-Whitney U test for comparisons between 2 groups and the Kruskal-Wallis test for comparisons among more than 2 groups. Results: A total of 355 implants in 170 patients (206 EC and 149 IC) fulfilled the inclusion criteria and were analyzed in this study. The mean MBL was 0.47 mm and 0.15 mm in the EC and IC implants, respectively, which was a statistically significant difference (P<0.001). Comparisons according to splinting (MBL of single implants: 0.34 mm, MBL of splinted implants: 0.31 mm, P=0.676) and cement use (MBL of cemented implants: 0.27 mm, MBL of non-cemented implants: 0.35 mm, P=0.178) showed no statistically significant differences in MBL, regardless of the implant connection type. Conclusions: IC implants showed a more favorable bone response regarding MBL in posterior areas without peri-implantitis or periodontal disease.

• 대한치위생과학회지
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• 제6권2호
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• pp.25-35
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• 2023

연구배경: 전신질환을 보유한 대상자를 위한 임상치과위생사 주도의 치위생관리과정에서의 중요성을 강조하고자 임상적 자료를 근거로 치과 임플란트에 영향을 미치고 있는 전신질환을 파악하고자 하였다. 연구방법: 치과 임플란트에 영향을 미치는 전신질환을 파악하고자 2023년 3월 1일부터 5월 31일까지 문헌고찰을 실시하였으며, 검색 시기는 2000년 1월~2020년 12월까지 국내·외 학술지에 게재된 연구 논문을 대상으로 하였다. 검색에 활용된 국내 database는 학술정보서비스(RISS), 누리미디어(DBpia), 한국학술정보(http://www.papersearch.net;KISS)를 활용하였으며, 국외 database는 Pubmed에서 '치과 임플란트 실패'와 '임플란트와 전신질환' 그리고 Dental implant failures와 Dental implant and systemic disease를 검색하여 전체 383편 중 최종적으로 13편의 자료를 선별하여 분석하였다. 결과: 임플란트의 누적생존률은 평균 94.3%이었으며 실패율은 5.7%이었다. 임상적으로 임플란트와 관련된 전신 질환에 대한 분석결과는 당뇨에 대한 연구가 13편(100.0%)으로 가장 높은 빈도를 차지하였으며 고혈압과 흡연에 대한 연구가 각각 8편(61.5%), 심혈관질환 7편(53.8%), 골관련 질환은 5편(38.5%) 순으로 위험요인이 조사되었다. 그 외 간질환 및 갑상선 이상 그리고 혈액이상 질환과 장기이식 및 감염성 질환 등이 확인되었다. 결론: 임상 치과위생사는 조절되지 않는 전신질환은 임플란트 실패의 위험요인이므로 전신질환이 임플란트에 미치는 영향에 대한 인식과 치위생 사정-판단-수행-평가 등의 주기적인 예방적 치위생관리 과정에서 환자와의 정보공유로 지속적으로 건강한 구강상태를 유지하도록 하여야 할 것이다.

• Journal of Periodontal and Implant Science
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• 제45권5호
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• pp.169-177
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• 2015

Purpose: Despite the high success rates of endosseous dental implants, their placement is restricted according to the height and volume of bone available. The use of short or mini dental implants could be one way to overcome this limitation. Thus, this study aimed to compare standard, short, and mini dental implants with regard to associated clinical parameters and peri-implant crevicular fluid (PICF) levels of cathepsin-K (CTSK), RANK ligand (RANKL), and osteoprotegerin (OPG), after prosthodontic loading. Methods: A total of 78 non-submerged implants (Euroteknika, $Aesthetica^{+2}$, Sallanches, France) were installed in 30 subjects (13 male, 17 female; range, 26-62 years) who visited the clinic of the Periodontology Department, Faculty of Dentistry, Selcuk University. Sampling and measurements were performed on the loading date (baseline) and 2, 14, and 90 days after loading. Assessment of the peri-implant status for the implant sites was performed using the pocket probing depth (PPD), modified plaque index, modified gingival index, modified sulcular bleeding index, and radiographic signs of bone loss. PICF samples collected from each implant were evaluated for CTSK, RANKL, and OPG levels using the ELISA method. Keratinized tissue and marginal bone loss (MBL) were also noted. Results: Clinical parameters statistically significantly increased in each group but did not show statistical differences between groups without PPD. Although implant groups showed a higher MBL in the upper jaw, only the standard dental group demonstrated a statistically significant difference. At 90 days, the OPG:sRANKL ratio and total amounts of CTSK for each group did not differ from baseline. Conclusions: Within the limitations of this study, both short and mini dental implants were achieving the same outcomes as the standard dental implants in the early period after loading.

• 한국치위생학회지
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• 제14권6호
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• pp.887-894
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• 2014

Objectives: The purpose of this study was to investigate the oral health education and oral health care in the implant wearers. Methods: A self-administered questionnaire was conducted by 253 patients in 14 different dental hospitals and clinics in Seoul and Gyeonggi-do from July 1 to September 30, 2012. The instrument was adapted from Kang and Lee, Yu and Shim, and Ko and Jang on the basis of the previous study. The questionnaire consisted of 12 questions including general characteristics of the subjects(4 questions), oral health education(3 questions), behavior and attitude of tooth brushing(3 questions), and use of auxiliary supplies(2 questions). Results: 1. 38.3% of the patients received the dental care education for the first time. The most common education method was demonstration by dental hygienists(28.9%). 26.2% of the patients wanted to know the right toothbrushing method. 2. The best toothbrushing methods were rolling method(28.9%) and Leonard's method(28.9%). 19.4% of the patients changed the toothbrushing method after education. 22.5 percent brushed their natural teeth and implant teeth by a different maneuver. 3. The interdental brush was the most commonly used product(35.8%) and most of the patients the interdental brush once a day(36.6%). 4. There was a significant difference between the frequency of toothbrushing and method(p<0.05). 5. There was a significant difference between the separate brushing of implant and natural teeth by the frequency of toothbrushing and method of education(p<0.05). 6. Use of interdental brush had an influenced on education method(p<0.05). Conclusions: Regular dental checkup and use of interdental brush can improve the oral care for the implant wearers. Regular use of interdental brush can prolong the life span of implant tooth and keep the patients' teeth in good condition.

• Journal of Korean Dental Science
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• 제6권1호
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• pp.27-33
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• 2013

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.

• Journal of Korean Dental Science
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• 제14권1호
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• pp.32-39
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• 2021

'Crossed occlusion' is the condition in which occlusal intercuspation is lost when several teeth on upper and lower jaw remain. This report describes a clinical case in which a patient had two upper-left posterior teeth and two lower-right posterior teeth; typically known as left-right crossed occlusion. Considering the patient's general condition and financial situation, the treatment plan included placement of two implants on each jaw against the remaining teeth using surgical guide. To find out the ideal position of implants, digital diagnostic wax-up was preceded by superimposing the cast and cone beam computed tomography image, which was aided with radiographic stents. The consequent surveyed implant bridge provided stable vertical stop for fabrication of the implant assisted removable partial dentures. The patient was satisfied with the functionality and esthetics of definitive prosthesis.

• The Journal of Advanced Prosthodontics
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• 제9권2호
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• pp.99-103
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• 2017

PURPOSE. The purpose of this study was to achieve more retention and stability and to delay or prevent screw loosening. MATERIALS AND METHODS. Twenty implants (Implantium 3.4 mm, Dentium, Seoul, Korea) were divided into 2 groups (n = 20). In the first group, an adhesive material was applied around the screw of the abutments (test group). In the second group, the screws are soaked in saliva (control group). All the screws were torqued under 30 N/cm, Then, the samples were gone through a cyclic fatigue loading process. After cyclic loading, we detorqued screws and calculated detorque value. RESULTS. In comparison with the control group, all the implant screws in the test group were smeared with the adhesive material, showing significant higher detorque value. CONCLUSION. There are significantly higher detorque values in the group with adhesive. It is recommended to make biocompatible adhesive to reduce screw loosening.

• 대한치과보철학회지
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• 제34권4호
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• pp.675-686
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• 1996

Today, dental implants are an acceptable alternative, capable of providing bone-anchored fixed prostheses for improved quality of life and self esteem for many patients. Research advances in dental implantology have led to the development of several different types of materials, and it is anticipated that continued research will likewise lead to advanced dental implant materials. Currently used pure titanium has relatively low hardness and strength which possibly limits its ability to resist the functional loads as a dental implant. Ti-6Al-4V also has potential problems such as corrosion resistance, bone biocompatibility etc. The carefully selected Zr, Nb, Ta, Pd, In constituents could improve mechanical strength, corrosion resistance, and biocompatibility compared to that of currently used implant metals. On the basis of the totality of the data from our study, it can be concluded that new titanium alloys containing Zr, Nb, Ta, Pd, In are able to provide improved mechanical properties, corrosion resistance and biocompatibility to warrant further investigation of it's potential as new biomaterials for dental implants.

• 대한치과기공학회지
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• 제31권1호
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• pp.7-15
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• 2009

Purpose: This study was to propose the clear understanding for stress distribution of supporting bone by use of staggered buccal offset tripodal placement of fixtures of posterior 3 crown implant partial dentures. We realized posterior 3 crown implant fixed partial dentures through finite element modeling and analysed stress effect of implant arrangement location to supporting bone under external load using finite element method. Method: To understand stress distribution of 3 crown implant fixed partial dentures which have 2 different arrangement by finite element analysis. In each model, for loading condition, we applied $45^{\circ}$ oblique load to occlusal surface of crown and applied 100 N for 3 crown individually(total 300 N) for imitating possible oral loading condition. at this time, we calculated Von Mises stress distribution in supporting bone through finite element method. Result: When apply $45^{\circ}$ oblique load to in-line arrangement model, maximum stress result for 100 N for each 3 crown 47.566MPa. In tripodal placement, result for 1mm buccal offset tripodal placement implant model was maximum distributed load 51.418MPa, so result was higher than in-line arrangement model. Conclusion: In stress distribution result by placement of implant fixture, the most effective structure was in-line arrangement. The tripodal placement does not effective for stress distribution, gap cause more damage to supporting bone.

• 대한치과의사협회지
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• 제54권2호
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• pp.108-122
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• 2016

Prosthetic-driven implant placement is a concept considering the dental implant restoration first based on the final form of that prosthesis to be restored. The latest development of the imaging technology and digital dentistry was able to be obtained the high quality images of CBCT with low radiation exposure and it has also enabled the process to reconstruct the intraoral state in three dimensions due to the development of the intraoral, model and impression scanner. Computer-guided implant placement simulations and template production was able to be more widely used in this context. In this narrative review, the features and the types of implant surgical guides will be introduced. It will also be described the diagnosis and treatment plan using computerguided implant software to reduce the number of visit and to increase the accuracy of the implant surgery through the top-down approach based on the shape and location of the final prosthesis.