• 대한치과기공학회지
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• 제43권1호
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• pp.19-28
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• 2021

Purpose: This study aimed to obtain basic data on oral health improvement by investigating the EQ-5D index according to the oral prosthesis status of elderly persons aged 65 years or older in Korea using the Seventh Korea National Health and Nutrition Examination Survey. Methods: In this study, 3,426 elderly persons aged 65 years or older were included to analyze the relationship between the dental prostheses status and EQ-5D index in the collected data. Results: Compared to the "complete denture" in oral prosthesis, EQ in case of no dental prostheses or fixed dental prostheses is comparable to removable prosthetics such as "no dental prostheses," "one fixed bridge," and "two or more fixed bridges." Removable partial denture and complete denture required for the maxillary and mandibular EQ-5D index were significantly higher in "not necessary" than in "complete denture necessary" in all the elderly persons. Conclusion: The condition of the dental prosthesis and the need for a removable partial denture and complete denture for the elderly's EQ-5D index were confirmed, and it was found that the fixed dental prostheses were more effective than the removable dental prostheses. Therefore, oral health education programs for the elderly should be developed to promote dental function and oral health maintenance.

• Journal of Periodontal and Implant Science
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• 제45권4호
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• pp.152-155
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• 2015

Purpose: This case report discusses the effect of a root submergence technique on preserving the periodontal tissue at the pontic site of fixed dental prostheses in the maxillary anterior aesthetic zone. Methods: Teeth with less than ideal structural support for fixed retainer abutments were decoronated at the crestal bone level. After soft tissue closure, the final fixed dental prostheses were placed with the pontics over the submerged root area. Radiographic and clinical observations at the pontic sites were documented. Results: The submerged roots at the pontic sites preserved the surrounding periodontium without any periapical pathology. The gingival contour at the pontic site was maintained in harmony with those of the adjacent teeth, as well as the overall form of the arch. Conclusions: The results of this clinical report indicate that a root submergence technique can be successfully applied in pontic site development with fixed dental prostheses, especially in the maxillary anterior esthetic zone.

• 대한치과의사협회지
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• 제56권3호
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• pp.152-158
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• 2018

Polyaryletherketone (PAEK) is recently introduced in dentistry. The polymer has superior mechanical and chemical properties compared to previous dental materials. PAEK has been explored for lots of applications for clinical dentistry. The prostheses can be made by the injection molding or milling techniques. Recent studies focus on improving the bioactivity of PAEK and expanding the application. The purpose of this article is to introduce the basic features, chemical structure and various clinical applications in fixed dental prostheses. Further research and clinical trials will be needed to confirm the usability of PAEK in the routine practice.

• 구강회복응용과학지
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• 제27권2호
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• pp.149-159
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• 2011

고정성 보철물의 장기적 예후를 보장하고자 하는 많은 노력에도 불구하고, 아직도 임상에서는 부적절한 제작 및 유지 관리로 인한 다양한 고정성 보철물의 합병증이 관찰되고 있다. 이에 본 연구에서는 고정성 보철물의 임상적 상태를 조사하여 보철 진료의 임상적 참고 자료와 연구의 기초 자료로 도움이 되고자하였다. 2009년 1월에서 2009년 12월까지 12개월간 부산대학교병원 치과 보철과에 내원한 환자 중 기존의 고정성 보철물을 철거하고 치료를 시행한 환자를 대상으로 고정성 보철물과 지대치에 연관된 임상적 상태를 조사 평가하여 다음과 같은 결과를 얻었다. 1. 전체 고정성 보철물의 추정 수명은 10.0년이었고, 평균 장착 기간은 $10.3{\pm}5.5$년이었다. 2. 악골에 따른 수명의 차이는 없었으나 (P>.05), 전후방 위치에서는 전치부 또는 구치부에 비해 전치부와 구치부를 포함하는 보철물의 수명이 가장 길었다 (P<.05). 3. 고정성 보철물의 재료별 수명은 금속관이 가장 길었고 (P<.05), 다른 재료들 간에는 유의한 차이가 없었다 (P>.05). 4. 고정성 보철물의 크기는 보철물 수명에 영향을 미치지 않았다 (P>.05). 5. 대합치 조건별 고정성 보철물의 수명은 자연치와 고정성 보철물, 가철성 국소 의치, 총의치 순으로 길었다 (P<.05). 6. 고정성 보철물의 생물학적 합병증은 치주 질환 (37.5%), 치아 우식증 (19.0%), 그리고 치수 질환 (10.8%) 순이었고, 기계적 문제점은 변연 결함 (18.4%), 보철물 파절(4.2%), 유지력 상실 (3.9%), 치아 파절 (3.6%), 그리고 식편 압입 (2.6%) 순이었다. 보철물을 철거한 후 치대치의 33.1%는 재수복이 불가능한 상태였다.

• 대한치과의사협회지
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• 제55권12호
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• pp.842-849
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• 2017

The term, 'crossed occlusion' implies clinical situation in which the residual teeth in one arch have no contact with those in the antagonistic arch, resulting in the collapse of occlusal vertical dimension. The treatment goal of this pathologic condition is restoration of the collapsed vertical dimension and stabilization of abnormal mandibular position. Previously, konus removable prostheses or tooth supported overdentures were suggested to solve crossed occlusion. Nowadays, dental implants have been used for definitive support to solve this problem. In this case report, a 65 years old female patient had a crossed occlusion, in which the maxillary posterior residual teeth and mandibular anterior residual teeth cross. Interim removable and fixed dental prostheses were used to confirm the proper vertical and horizontal jaw relation. After that, the mandibular posterior edentulous region was restored with implant-supported fixed dental prostheses. Computer tomography guided implant surgery was performed according to the concept of the restoration-driven implant placement. The maxillary anterior edentulous region was restored with Kennedy class IV removable prosthesis, considering the patient's economic status. The patient's jaw position and prostheses have been well maintained at the follow-up after 6 months of definitive restoration. The antero-posterior crossed occlusion problems appeared to be effectively solved with the combination of removable in one arch and implant-supported fixed prostheses in the other.

• 대한치과기공학회지
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• 제35권1호
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• pp.49-56
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• 2013

Purpose: The deformation characteristics induced by non-destructive stresses using piezoelectric transducer(PZT) were analyzed for 3-unit fixed partial dentures manufactured PFM, Everest(CAD/CAM) and Zirkonzahn(copy milling, MAD/MAM) by electron speckle pattern interferometery(ESPI). Methods: The ESPI analysis after loading the restoration with PZT by applying electric voltage of 900mV at the points of 10 mm above the base of the prostheses. Results: PFM and All-Ceramic Everest prostheses showed about 0.1 ${\mu}m$ while that of All- Ceramic Zirkonzahn prostheses showed 0.085 ${\mu}m$, demonstrating that Zirkonzahn displaced less. For PFM and All-Ceramic Zirkonzahn prostheses, the displacements were large at just below the loading point, while generalize displacement was shown over the loading point and weak connector areas for All-Ceramic Everest prostheses. Conclusion: We could find that the deformation characteristics induced by non-destructive stresses using PZT analyzed by ESPI were similar to the fracture strengths evaluated using universal testing machine.

• 대한치과기공학회지
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• 제36권3호
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• pp.159-164
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• 2014

Purpose: The purpose of this study was analysis of quality of fixed prostheses fabricated by dental CAD/CAM system. Methods: The ten same cases of stone models were manufactured by dental scannable model, and stone models were scanned using the dental scanner for changing digital model. Ten digital models were completed. The design of zirconia core for zirconia based all-ceramic crown was conducted by the dental CAD program. The samples were fabricated using the pre-sintered zirconia block by dental milling machine. Marginal gaps were analyzed using by silicone replica technique at the eight parts for quality analysis of samples. One-way ANOVA was used for statistical analysis(${\alpha}=0.05$). Results: The mean for marginal gaps were $93.2{\sim}99.1{\mu}m$ at the eight parts. One-was ANOVA didn't show significant differences(p=0.089). Conclusion: The fixed dental prostheses fabricated by dental CAD/CAM were within clinically acceptable range.

• 구강회복응용과학지
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• 제28권4호
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• pp.359-370
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• 2012

근관 치료가 시행된 치아의 상당수는 많은 치질의 상실로 인하여 통상적으로 치수관 내에 포스트를 세워 유지를 얻고 코어를 제작하여 최종 보철물을 제작하는 방법으로 치료되고 있다. 포스트와 코어를 이용한 고정성 보철물의 장기적 예후를 보장하고자 하는 많은 노력에도 불구하고, 임상에서는 다양한 합병증이 관찰되고 있다. 이에 본 연구에서는 근관 치료를 받고 포스트와 코어를 시행한 치아에 제작된 고정성 보철물의 임상적 상태를 조사하여 보철 진료의 임상적 참고 자료와 연구의 기초 자료로 도움이 되고자 하였다. 1990년에서 2005년까지 부산대학교병원 치과 보철과에 내원한 환자 중 근관 치료 후 포스트와 코어를 시행하고 고정성 보철물을 치료 받은 환자를 대상으로 고정성 보철물에 연관된 임상적 상태를 조사 평가하여 다음과 같은 결과를 얻었다. 1. 전체 고정성 보철물의 추정 수명은 11.1년이었고, 평균 장착 기간은 $9.7{\pm}3.4$년이었다. 2. 나이와 성별에 따른 수명의 차이는 나타나지 않았다 (P>.05). 3. 악골에 따른 수명의 차이는 나타나지 않았으나 (P>.05), 전후방 위치에서는 전치부에서 수명이 가장 길었고 구치부, 견치를 포함하는 보철물 순으로 수명이 짧았다 (P<.05). 4. 포스트의 재료 및 방법과 고정성 보철물의 종류는 보철물의 수명에 영향을 미치지 않았으나 (P>.05), 보철물의 재료는 수명에 영향을 미쳤다(P<.05). 5. 고정성 보철물의 크기는 보철물의 수명에 영향을 미치지 않았다 (P>.05). 6. 대합치 조건별 고정성 보철물의 수명은 차이가 없었다 (P>.05). 7. 고정성 보철물의 합병증은 치아 우식증 (34.5%), 치주 질환 (25.9%), 치아 파절 (15.5%), 치수 질환 (12.1%) 순이었다. 보철물을 제거한 후 잔존 치질은 51.9%가 수복 불가능한 상태였다.

• Journal of Periodontal and Implant Science
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• 제43권2호
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• pp.51-57
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• 2013

Implant treatment has become the treatment of choice to replace missing teeth in partially edentulous areas. Dental implants present different biological and biomechanical characteristics than natural teeth. Occlusion is considered to be one of the most important factors contributing to implant success. Most literature on implant occlusal concepts is based on expert opinion, anecdotal experiences, in vitro and animal studies, and only limited clinical research. Furthermore, scientific literature regarding implant occlusion, particularly in implant-supported fixed dental prostheses remains controversial. In this study, the current status of implant occlusion was reviewed and discussed. Further randomized clinical research to investigate the correlation between implant occlusion, the implant success rate, and its risk factors is warranted to determine best clinical practices.

• 대한치과의사협회지
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• 제51권5호
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• pp.242-249
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• 2013

The proper occlusal design is one of the most important factors for the long-term success. The purpose of this research is to investigate and define occlusal considerations to reduce failure of implant-supported fixed prostheses. The physiological movement of implants is markedly lower than that of natural teeth and they also lack in occlusal sensitivity. Proper occulsal pattern may be assigned to compensate for the biological disadvantages and occlusal contacts must be formed where the cantilever effect is minimized. Moreover, the long-term success can be assured by reducing early occulsal loading to avoid implant overloading and selecting appropriate occlusion material.