• 한국치위생학회지
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• 제8권1호
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• pp.147-161
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• 2008

The present writer conducted this study in order to seek desirable directions to enhance right recognition of aesthetic dental prostheses and maximize the aesthetic effect of dental prostheses, by investigating satisfaction with and recognition of aesthetic prostheses among citizens in Daejeon, the writer carried out a self-administered survey with a questionnaire, reaching the following conclusions. 1. It was revealed that 54.4% of them had previous knowledge of aesthetic prostheses while 45.6% had not, and among people with the knowledge, 20.8% acquired it from the dental clinic interested. 2. It was revealed that 58.9% were not satisfied with their front teeth, and among them 24.8% were discontented with their teeth color most. 3. In general characteristics according to whether or not they have previous knowledge aesthetic prosthesis, among people with the knowledge 58.8% were female while 41.2% were male, showing a statistically significant difference (pM0.002). 4. In terms of levels of satisfaction with aesthetic dental prostheses by age, in the case of dissatisfaction people over 30 were most with 14.1%. 5. In terms of levels of recognition of aesthetic prostheses according to whether or not they have previous knowledge of those, among people with the knowledge, 55.8% reported that aesthetic prostheses are necessary (pM0.000). 6. In terms of levels of recognition of aesthetic prostheses according to whether or not they have aesthetic prostheses, among people with knowledge of the kinds of aesthetic prostheses, 87.2%(pM0.000). It was thought that in order to create accurate recognition of and enhance satisfaction with aesthetic dental prostheses, dental care expenses should be adjusted reasonably and also dentists should perform public relations actively with accurate information and provide related education.

• 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.

• 대한치과보철학회지
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• 제43권4호
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• pp.498-510
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• 2005

Purpose: The purpose of this study was to compare the maximum occlusal force implant prostheses to natural teeth. Material and Method: Fifty nine patients treated either with $Br{\aa}anemark$ implants and ITI implants during the recent ten years were involved in this study. The maximum occlusal force were measured with unilateral bite force recorder and dental prescale system. Results: 1. The maximum occlusal forces of the implant prostheses and natural teeth were not significantly different where measured with unilateral bite force recorder and dental prescale system. 2. The maximum occlusal forces were not significantly different between $Br{\aa}nemark$ implant and ITI implant prostheses. 3. The maximum occlusal forces of the implant prostheses had lower when compared with natural teeth during 1-6 months functional periods when measured with the unilareral bite force recorder(P<0.05) and 1-12 months functional periods when measured with the dental prescale system(P<0.05). After these periods there was not statistical significant difference between the implant prostheses and natural teeth. 4. The maximum occlusal forces of the wide diameter implant prostheses were higher than the maximum occlusal forces of the regular diameter implant prostheses when measured with dental prescale system(P<0.05), but there was no significant difference between the wide diameter and the regular diameter implant prostheses when measured with unilateral bite force recorder. 5. The maximum occlusal forces of the single implant prostheses were not significantly different with the splinting implants prostheses. 6. The maximum occlusal forces of the implant prostheses were not significantly different by age and sex. 7. There was significantly different between maximum occlusal forces measured with unilateral bite force recorder and dental prescale system(P<0.0001) but there was positive correlation(r=0.52. P<0.05). Conclusion: The maximum occlusal forces of the implant prostheses were not significantly different to natural teeth during clenching and unilateral maximum biting.

• 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.

• 대한치과기공학회지
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• 제16권1호
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• pp.57-77
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• 1994

The purpose of this study is to investigate the extent to which dental laboratories use proper materials, procedures, devices, and equipments to fabricate crown & bridge, PFM(Porcelain Fused to Metal) crown & bridge, partial denture, complete denture, and other prosteses. 100 laboratories in Seoul were selected for this investigation. Questionnaires were constructed focusing on five topocs:crown & bridge, PFM crown & bridge, partial denture, complete denture, and other prostheses. The results from this survey were as follows : 1. Most dental laboratories used old, inexpensive, and familiar materials rather than newly developed ones. 2. Most of the dental technicians did not stick to the standard procedures of handling materials, but to their own experiences. 3. Newly developed equipments to fabricate dental prostheses were possessed by nearly 30% dental laboratories. 4. About 80% of dental laboratories were using the procedures they had learned in the school : die trimming for accurate crown margin and softening heat treatment after RPD gold casting. But less than 30% of laboratories were shown to follow the boxing procedure to produce master cast and laboratory remounting in the process of complete denture. The findings show that dental laboratory procedures to fabricate dental prostheses are incomplete and inaccurate in some instances. So, further studies are neededs to clarify the causes of some inaccurate procedures, the better and more equipments should be supplied to produce the more accurate dental posthesis, and more efforts at enancing the appropriate use of dental materials and procedures should be made.

• 대한치과보철학회지
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• 제54권4호
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• pp.341-353
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• 2016

목적: 보철물 수명 연구에서 가장 중요한 것은 보철물을 객관적이고 일관성 있게 평가하는 것이다. 대한치과보철학회에서는 이 필요성을 충족시키기 위해 보철물 수명연구를 위한 대한치과보철학회의 표준 방안을 마련하기로 하였다. 본 연구의 목적은 보철물 수명 연구의 통일된 표준을 마련하기 위한 보철물 평가 흐름도와 보철물 평가 기록지를 제작하는 데 있다. 재료 및 방법: 기존에 사용되었던 보철물 평가 방법을 문헌 고찰을 통해 알아본 후 직관적이며, 사용하기 쉽고, 보철물의 상태를 객관적으로 구분할 수 있는 평가 기준을 개발한다. 또한 이 기준을 시범 사용하여 문제점과 개선점을 파악한다. 결과: 고정성 보철물 30 증례, 가철성 보철물 25증례, 그리고 임플란트 보철물 13 증례로 시범 사용하여 Kaplan-Meier 생존율 분석을 시행한 결과 고정성 보철물의 평균수명 추정치는 12.82년, 가철성 보철물은 5.96년, 임플란트 보철물은 4.82년의 결과를 얻었다. 또한 조사자들에게 시범 사용 후의 문제점을 수렴하여 수정, 보완한 후 보철물 평가흐름도 및 보철물 평가 기록지를 완성하였다. 결론: 보철물 수명 평가를 위한 대한치과보철학회 표준 방안 마련을 위해 개발된 보철물 평가 흐름도와 보철물 평가 기록지를 통해 보다 객관적이고 통일된 자료 수집이 가능하였다. 향후 본 표준 방안을 이용한 보철물 수명연구가 시행될 것이다.

• 대한치과기공학회지
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• 제41권4호
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• pp.263-269
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• 2019

Purpose: The purpose of this study was to evaluate the internal fitness of prostheses fabricated with non-contact extra-oral scanner and those fabricated with intra-oral video scanner, with a comparative accuracy analyses of their precision and trueness. Methods: A polymethyl methacrylate (PMMA) model was fabricated by replicating a master model. The prostheses in the first group were fabricated based on the PMMA model with an intra-oral video scanner (IVS group). Following the fabrication of work models with Type IV Stone that were based on the PMMA model, the prostheses in the second group were fabricated with a non-contact extra-oral scanner (ENB group). The precision and trueness of the prostheses were calculated from comparisons of the three-dimensional images of the internal surfaces of the prostheses and those of the master model. Kruskal-Wallis tests were used to determine the statistical significance, with the level of type 1 error set at 0.05. Results: Trueness (P < 0.009) and precision (P < 0.001) did not differ significantly between the ENB and IVS groups. The IVS group exhibited lower trueness values and larger precision values than the ENB group. Conclusion: Although no significant differences were found in the internal fitness of the prostheses that were fabricated by the two different scanners, the intraoral video scanner-fabricated prostheses had better trueness, whereas the non-contact extra-oral scanner-fabricated prostheses had better precision.

• 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.