• 대한치과의사협회지
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• 제57권6호
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• pp.326-332
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• 2019

Extraction treatment has been used for a long time to treat crowding or lip protrusion patients and still extraction decision is the most difficult and important decision during diagnosis and treatment planning. If the amount of crowidng is severe, premolar extraction is often considered. Because of their location, premolar extractions would seem to allow for the most straightforward relief of crowding and the improvement of soft tissue profile. But patients and their parents often prefer nonextraction approach if possible and such a preference gives us serious question about the boundary of nonextraction treatment. Because Orthodontic Mini-Implant (OMI) become popular these days, distalization of posterior teeth can be obtained easily without patient's compliance. For this reason, many orthodontists are trying to treat crowding patient with nonextraction than before. But sometime, unexpected side effects are observed including unesthetic profile, impaction of second molar and long treatment time. All the tools for space gaining - extraction, arch expansion, molar distalization and interproximal enamel reduction - have their limitations and indications. Possible side effects and limitations should be carefully considered during the treatment planning. Although Korean patients usually require extraction more often than US or European patients, more knowledge about the tools for space gaining would help us to decrease the rate of extraction and the problems during treatment of crowding patients.

• 대한치과보철학회지
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• 제55권4호
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• pp.458-466
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• 2017

구강종양을 절제한 경우 악안면 구조의 상실로 인해 발음, 저작, 심미 등 기능장애를 유발하게 되므로 기능회복을 위해 보철 수복이 필요하다. 이때 임플란트를 이용하면 보철물의 효과적인 기능 향상을 기대할 수 있다. 하지만 골절제술을 시행한 후, 이식골의 성공률과는 별개로 연조직이 감염에 취약한 형태를 갖기 쉬우며 이식골은 염증에 이환된 경우 빠른 속도로 파괴가 발생할 수 있다. 성공적인 보철치료를 위해서는 보철치료에 앞서 적절한 연조직 처치와 보철수복 후 잦은 정기검진을 통해 임플란트의 예후와 연관된 각별한 주의가 필요하다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제40권
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• pp.32.1-32.8
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• 2018

Background: The free vascularized fibula flap presents many advantages such as sufficient length of the bony segment, good vascularization, better quality of the bone, and a long vascular pedicle, but it is also associated with some disadvantages with regard to prosthetic rehabilitation because of its limited height. Improvement in bone height is necessary for ideal dental implant treatment of reconstructed mandibles. Case presentation: For two squamous cell carcinoma patients, mandibular bone reconstruction was performed secondarily with the peroneal flap after tumor resection. Since the bone height was insufficient at the time of implant treatment, occlusion reconstruction by dental implant was performed after vertical distraction osteogenesis. Conclusions: Vertical distraction osteogenesis is a suitable treatment option for alveolar ridge deficiency resulting from fibula transplantation for mandibular reconstruction following tumor surgery.

• 대한치과보철학회지
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• 제60권1호
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• pp.110-118
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• 2022

다수의 치아 상실은 교합의 부조화를 일으키며, 수직고경 상실과 하악 운동의 변위를 유발할 수 있기 때문에 중심위에서 적절한 수직 고경과 교합을 재형성하는 것이 중요한 치료 목표가 될 수 있다. 한편, 임플란트 보조 국소의치는 국소의치의 유지, 지지 및 안정을 증가시켜 환자의 만족도를 높이기 때문에 최근에 자주 사용되는 임상 술식이다. 본 증례는 편측 구치부 및 전치부 지지의 소실로 편측 교합면간 거리가 소실된 환자에서 치료 의치를 제작하고 기존에 식립된 양측의 임플란트를 지대치로 이용한 임플란트 보조 국소의치를 제작하였고 양호한 임상 결과를 확인하였기에 이를 보고하고자 한다.

• 대한치과보철학회지
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• 제60권4호
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• pp.382-394
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• 2022

심한 치주염을 가진 환자의 치료는 환자의 개개 치아의 정확한 진단과 전략적인 치료 계획을 통해 단계적으로 진행되어야 한다. 임플란트 지지 고정성 보철 수복은 국소의치에 비해 환자의 만족도가 높고, 안정적인 수직 고경을 유지할 수 있는 장점이 있지만, 경조직이 부족한 다수 치아 결손 부위에서는 심미적인 측면의 실패와 치료 기간이 길어진다는 점의 단점이 있을 수 있다. 또한 통상의 고정성 보철물을 제작하고 장착하는 데에는 일정 기간이 소요되는데, 이 기간 동안 임시 보철물은 치아의 기계적, 생물학적, 심미적 요구 조건을 만족시켜야 한다. 이번 증례 보고에서는 상악과 하악의 부분 무치악 환자에서 단계적인 접근을 통한 임플란트 고정성 보철물을 수복한 증례를 보고하고자 한다.

• The Journal of Advanced Prosthodontics
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• 제10권1호
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• pp.73-78
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• 2018

PURPOSE. The purpose of this study was to analyze the effects of two different implant surface treatments on initial bone connection by comparing the Removal Torque Values (RTQs) at 7 and 10 days after chemically modified, sandblasted, large-grit and acid-etched (modSLA), and Laser-etched (LE) Ti implant placements. MATERIALS AND METHODS. Twenty modSLA and 20 LE implants were installed on the left and right tibias of 20 adult rabbits. RTQs were measured after 7 and 10 days in 10 rabbits each. Scanning electron microscope (SEM) photographs of the two implants were observed by using Quanta FEG 650 from the FEI company (Hillsboro, OR, USA). Analyses of surface elements and components were conducted using energy dispersive spectroscopy (EDS, Horiba, Kyoto, Japan). RESULTS. The mean RTQs were $12.29{\pm}0.830$ and $12.19{\pm}0.713$ Ncm after 7 days (P=.928) and $16.47{\pm}1.324$ and $16.17{\pm}1.165$ Ncm after 10 days (P=.867) for LE and modSLA, respectively, indicating no significant inter-group differences. Pore sizes in the LE were $40{\mu}m$ and consisted of numerous small pores, whereas pore sizes in the modSLA were $5{\mu}m$. In the EDS analysis, Ti, O, and C were the only three elements found in the LE surfaces. Na, Ca, Cl, and K were also observed in modSLA, in addition to Ti, O, and C. CONCLUSION. The implants showed no significant difference in biomechanical bond strength to bone in early-stage osseointegration. LE implant can be considered an excellent surface treatment method in addition to the modSLA implant and can be applied to the early loading of the prosthesis clinically.

• Journal of Oral Medicine and Pain
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• 제39권4호
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• pp.133-139
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• 2014

Purpose: There have been reports regarding the various factors associated with the level of discomfort and recovery from neurosensory symptoms in patients with trigeminal nerve injury. However, the contributing factors remain uncertain and poorly understood. The purpose of this paper was to investigate the possible association between various factors expected to affect neurosensory discomfort and recovery in patients with mandibular nerve injury after dental implant surgery. Methods: Eighty-nine post-dental implant surgery patients with mandibular nerve injury were enrolled in this retrospective analysis. A medical records review of the patients was done to determine if the patients' improvement was related to pain intensity, the length of time between the injury and removal of the implant or the depth of penetration of the implant into the mandibular canal as determined by cone-beam computed tomography. Results: There was no significant linear relationship between pain intensity and symptomatic improvement (p=0.319). There was no significant linear relationship between the level of mandibular canal penetration and either pain intensity (p=0.588) or symptomatic improvement (p=0.760). There was a statistically significant linear relationship between length of time before the injury was treated, both with pain intensity (p=0.004), and symptomatic improvement (p=0.024). Conclusions: Our findings indicate that the length of time between nerve injury and initiation of conservative treatment is more closely related to the pain intensity and symptomatic improvement than other factors, including the level of mandibular canal invasion. Additionally, increased pain intensity and decreased symptomatic improvement can be expected over time, because of this linear trend. Therefore, although direct injury to the nerve is the most important factor contributing to a neurosensory disturbances, early neurosensory assessment and initiation of conservative treatment should be done to optimize recovery.

• 치위생과학회지
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• 제18권3호
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• pp.155-163
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• 2018

This study's aim was to investigate their opinions to improve the educational system for dental hygienists on the basis of their duties as dental hygienists. The qualitative study was conducted among 19 dental hygienists at Daejeon, Korea from July to August 2016. Two researchers followed each subject for working hours in a day and recorded all the tasks and time to take for each task. After one day, the researchers met each subject and conducted face-to-face interviews to investigate the opinions about the dental hygiene curriculum and national board examination. The main duties recognized by more than half of the subjects were oral disease prevention including scaling and dental treatment assistance. The subjects' minority opinion about the main duties included radiography, impression taking, dental implant surgery assistance, orthodontic treatment, patient counseling, dental management and staff management, and oral health education. The most important tasks perceived by the subjects were prosthetic and implant impressions, scaling and implant surgery assistance. The subjects' minority opinion about the most important duties included patient counseling and making temporary crowns. The most difficult tasks answered by the subjects were prosthetic and implant impressions and dental implant surgery assistance. The subjects' minority opinion about it included patient counseling, scaling, and making temporary crowns. They mentioned that their curriculum in college was different from the actual work and the national board examination was not reflective of their real duties. We found out Korean dental hygienists had a lot of roles as dental assistants, dental business managers, and so on. We suggest that the law, curriculum and national board examination for dental hygienists should be revised to be able to reflect the reality of the clinical field.

• 대한치과보철학회지
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• 제57권2호
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• pp.150-159
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• 2019

무치악 환자의 치료에서 치과용 임플란트를 이용한 보철치료는 현재 널리 사용되고 있는 치료 방법 중 하나이다. 임플란트를 적절한 위치에 정확히 식립하기 위해 최근 임플란트 수술용 가이드를 이용하여 임플란트 수술의 정확도를 향상시키는 방법이 소개되어 폭넓게 사용되고 있다. 임플란트 수술 시 임플란트 수술용 가이드를 적용하는 수준에 따라 완전 유도 임플란트 수술과 부분 유도 임플란트 수술로 구분할 수 있다. 비록 완전 유도 임플란트 수술이 더 높은 정확도를 보이는 것은 사실이나 수술상황에서의 다양한 임상적 환경 등으로 인해서 부분 유도 임플란트 수술이 종종 시행된다. 이 증례는 치아파절과 치주염 등으로 치아를 상실하게 된 부분무치악 환자에서 임플란트와 고정성보철물을 이용해서 보철 수복 치료를 시행한 사례이다. 임플란트 수술 과정에서 임플란트 수술용 가이드를 사용해서 부분 유도 임플란트 수술을 시행하였으며, 임플란트 수술 계획과 수술 결과 간의 정확도에 대한 분석을 시행하여 소개하였다.

• 대한치과의사협회지
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• 제53권5호
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• pp.318-325
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• 2015

Peri-implantitis is defined as an inflammatory process affecting the tissues around an osseointegrated implant, resulting in the loss of the supporting bone. Microbial adherence and colonization appear to play a major role in the pathogenesis of periimplantitis. The decision regarding treatment strategies is based on the diagnosis. The severity of the peri-implant lesion and the treatment strategies must include mechanical cleaning (infection control) procedures. Mechanical instrumentation is widely used for the debridement of dental implants, but this may alter the titanium's surface properties. Therefore, selection of the type of instrumentation should be made depending on the type of surface to be debrided. Also, patients with dental implants must always be enrolled in a supportive therapy program.