• The Journal of the Korean dental association
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• v.27 no.6 s.241
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• pp.527-530
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• 1989

국소의치에 있어서 인공치는 기능적 관점에서와 심미적 관점에서 중요한 구성요소중의 하나이다. 구치는 저작기능을 회복시켜주며 악궁간 거리를 유지하여 주며 상실된 안모의 형태를 회복시켜준다. 전치는 저작기능의 회복뿐만 아니라 심미성을 회복시켜주며 발음 기능에 있어 중요한 역할을 한다. 이러한 인공치의 기능을 위해서는 인공치는 여러 요구조건을 갖게되는데, 무치악 공간에 잘 맞아야 하며 metal framework에 잘 맞아야 하고 깨지지 말아야 하며 마모되지 않아야 하고 유해한 작용이 없이 어떤 교합형태를 갖거나 어떤 재료로 되어 있는 치아이던지 잘 교합될 수 있어야 한다. 이러한 이상적인 인공치는 없으나 국소의치의 요구를 만족시켜줄 수 있는 여러 종류의 인공치의 이용이 가능하므로 이러한 인공치의 장점과 단점을 이해하여 국소의치 제작시 가장 적당한 인공치를 선택하여 사용하는 것이 중요하다.

• The Journal of the Korean dental association
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• v.27 no.6 s.241
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• pp.509-514
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• 1989

국소의치나 총의치에 사용하는 인공치는 대부분 도재치(porcelain teeth)와 레진치(resin teeth, plastic teeth)이다. 도재치나 레진치 모두 자연치아와 유사한 색조를 갖고 있어 자연감을 나타내기 때문이다. 인공치의 대표적인 도재치와 레진치에 대하여 이공학적 측면, 임상측면, 기공측면에서 재료학적 고찰을 한다.

• The Journal of Korean Academy of Prosthodontics
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• v.58 no.4
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• pp.300-305
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• 2020

Purpose: The purpose of this study is to compare the shear bond strength of 3D printing denture base resin according to surface treatment of artificial teeth. Materials and methods: 3D printing denture base resin was fabricated as specimens using 3D printer. The experimental group divided the surface treatment of artificial teeth into five groups according to the application of sandblasting and primer (n=10). Shear bond strengths between denture base and artificial teeth were measured by universal testing machine. All measurements were analyzed by one-way ANOVA and Turkey test (α=.05). Fracture mode of each specimen was analyzed. Microscopic evaluation was conducted by using a scanning electron microscope. Results: Unsurfaced treated group represented the lowest value. The primer groups had significantly higher result values (P<.05). Most specimens of the primer groups had cohesive failure. Conclusion: In 3D printing denture base resin group, mechanical and chemical surface treatment of artificial teeth has increased the shear bond strength. Therefore, if dentures are produced using 3D printing, proper mechanical and chemical treatment of artificial teeth is necessary for adhesion of dentures and artificial teeth.

• The Journal of Korean Academy of Prosthodontics
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• v.55 no.4
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• pp.394-402
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• 2017

Purpose: The purpose of this study is to evaluate the displacement of artificial tooth of monolithic complete denture manufactured by milling and 3D printing method in which the denture base and the artificial teeth are simultaneously made. Materials and methods: Twelve upper and lower complete dentures for each were made by milling and 3D printing method. Group Up and Group Lp are a group of upper and lower dentures made by printing, and Group Um and Group Lm are denture groups made by milling. Group Uc and Group Lc are is a group of finally designed upper and lower dentures respectively. Measurements were performed between both central incisors (AB, ab), both canines (CD, cd), both first molars (EF, ef), between an incisor and a first molar (AE, ae), and between incisor and lingual point (AG, ag) for each upper and lower denture. Results: AG and ag value between printed dentures and original ones as well as between milled dentures and original ones showed a statistically significant difference (One-way ANOVA, P<.05) in both lower and upper monolithic dentures. In the lower monolithic ones, ab, cd and ef value revealed a significant difference between Group Lp and Group Lm (One-way ANOVA, P<.05). Conclusion: Dentures made using milling or 3D printers revealed statistically significant difference compared with those of original data. However, it showed clinically very accurate reproducibility.

• Journal of the Korean Institute of Landscape Architecture
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• v.31 no.2
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• pp.70-82
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• 2003

본 연구의 목적은 산림경관의 스트레스 완화 효과를 생리측정(피부 돌출치와 심장박동시간)과 심리측정 (ZIPER 설문지)을 통하여 조사하는 것이다. 연구가설은 두 가지로 첫 번째 가설에서는 산림경관을 본 사람들의 스트레스 측정치가 인공경관을 본 사람들의 측정치보다 낮을 것이라고 예측되었다. 두 번째 가설에서는 산림경관을 본 사람들의 스트레스 해소가 인공경관을 본 사람들보다 보다 빠르고 완전하게 발생할 것으로 예측되었다. 실험에는 대학 학부학생 70명이 참여하였으며, 실험에 이용된 산림 및 인공경관은 예비설문을 거쳐 선정되었다. 실험결과를 보면 첫 번째 가설은 피부 돌출치와 긍정적인 심리요인 그리고 부정적인 심리요인에서 채택되었다. 두 번째 가설 중 스트레스 해소속도에 대한 가설은 피부 돌출치와 심장박동시간에서 모두 채택되었으나, 스트레스 해소의 완전성에 대한 가설은 피부 돌출치에서만 채택되었다. 비록 심장박동시간과 집중/호기심 요인에서 연구가설이 채택되지 못했지만 전반적으로 산림경관과 인공경관을 비교할 때 산림경관의 스트레스 완화효과가 더 크고 빠르고 완전함을 알 수 있다. 본 연구의 의의는 산림경관의 효과를 두 가지 측정(생리적, 심리적)을 이용하여 조사하였다는 점과 국외연구결과와 유사한 결과를 얻음으로써 이러한 효과가 지역에 관계없이 공통적임을 밝혔다는 점이다. 본 연구결과는 산림이 인간의 건강과 복지에 긍정적이라는 점을 입증함으로써 산림의 조성과 보존에 중요한 근거를 제공할 수 있다. 보다 발전적인 후속연구를 위해서는 다양한 종류의 인공경관과 일반시민들의 참여, 그리고 인지능력의 병행이 필요하다.

• The Journal of the Korea Contents Association
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• v.15 no.6
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• pp.267-275
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• 2015

This study has been implemented to check the effect of roughness on the color stability according to the surface treatment of artificial teeth. 20 units of 3 groups with the different surface treatment of artificial teeth have been precipitated in the soy sauce, the red pepper paste, the coffee and the cola, measure equipment was used for Shade-eye(Chroma Meter, Shofu, U.S.A). The value of L*, a*, b* using its average value after measuring 3 times per 1 point by selecting 3 points randomly out of central parts of teeth on a cycle of each 1 day, 1 week, 2 weeks, 3 weeks, 4 weeks after precipitation in terms of precipitated specimens. As a result of Multiple regression analysis, the value of ${\Delta}E*$ of artificial teeth according to the surface treatment showed the significant negative(-) effect in the Group 2(p<0.001) and the red pepper paste had the biggest effect on the color change of artificial teeth out of pollution source.

• Journal of Dental Rehabilitation and Applied Science
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• v.40 no.2
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• pp.82-90
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• 2024

It often happens that a removable partial denture needs to be repaired due to tissue changes in the remaining alveolar ridge, fracture of the denture, or fracture of the abutment tooth. There are several advantages to retrofitting a customized surveyed crown under the existing RPD. Retrofitting a crown to the RPD decreases the economic burden to the patient and avoids the need for several appointments to fabricate a new RPD. It is difficult for artificial teeth used to repair dentures due to fractured natural teeth to have a shape similar to that of natural teeth, and to repair aesthetic artificial teeth, it is necessary to manufacture customized artificial teeth similar to the shape of each patient's teeth. Recently, CAD/CAM technology has been used to fabricate customized prosthetics on existing RPD to achieve high retention and fitness accuracy, and by manufacturing customized artificial teeth, more aesthetic and harmonious artificial tooth repair is possible. This is a case in which a denture was repaired using a digital method to fabricate a customized prosthesis on an existing partial denture and customized artificial teeth that mirrored the adjacent dentition, saving time and cost, simplifying the process, and achieving aesthetically and functionally satisfactory results.

• The Journal of Korean Academy of Prosthodontics
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• v.47 no.1
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• pp.82-90
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• 2009

Statement of problem: Recently, as patients' expectation and interest for esthetics are increasing, concerns of esthetic restoration for removable dentures as well as fixed prosthodontics are also increasing. And the color stability of artificial teeth will affect a long term success rate of the denture. But the stain or discoloration of these artificial teeth as well as denture resin has caused esthetic problem. Purpose: This study was designed to evaluate the influence on color stability of artificial teeth when soy sauce, red pepper paste and coffee which many Koreans have eaten were applied. Material and methods: For artificial teeth type(Endura $Anterio^{(R)}$, Physio $Duracross^{(R)}$, Trubyte $Biotone^{(R)}$) selected for the study, 10 specimens each were soaked into individual beakers of soy sauce, red pepper paste, coffee and distilled water. And $L^*$, $a^*$, $b^*$ value were measured for evaluation of the color difference (${\Delta}E^*$) with spectrophotometer on the 1 day, 1 week, 2 weeks, 4 weeks and 8 weeks after immersion. Results: 1. ${\Delta}E^*$ value of artificial teeth which were soaked in soy sauce and coffee was various according to soaking periods. However there was significant difference between Trubyte $Biotone^{(R)}$ and Physio $Duracross^{(R)}$ in red pepper paste regardless of soaking period(P<.05). 2. Except for 8 weeks of Endura $Anterio^{(R)}$, 4 weeks and 8 weeks of Physio $Duracross^{(R)}$, artificial teeth soaked in red pepper paste regardless of the type had significant difference of ${\Delta}E^*$ value compared with other groups (P<.05). 3. $a^*$, $b^*$ value of Endura $Anterio^{(R)}$ and Trubyte $Biotone^{(R)}$ which were soaked in red pepper paste had significant difference compared with the value of other group(P<.05). Conclusion: Red pepper paste had the greatest effect on color difference of artificial tooth. Physio $Duracross^{(R)}$ showed relatively less color difference than Trubyte $Biotone^{(R)}$ and Endura $Anterio^{(R)}$. But as ${\Delta}E^*$ difference were all less than 3.3, these artificial resin teeth seemed appropriate for clinical use.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.787-790
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• 2021

본 논문에서는 최신 모션 인식 기술을 활용하여 골프 스윙 비디오에서 사람의 자세를 추정한 후 다양한 원인으로 오검출된 좌표들을 보정하여 자세 추정의 정확도를 높이는 방법을 제안한다. 기존의 사람 자세 추정 모델은 골프 스윙 데이터에서 오검출, 반전, 불안정성, 미검출의 문제를 보여 정확한 자세 추정을 어렵게 했다. 이를 해결하기 위하여 본 연구에서는 자세 추정시 발생하는 이상치 데이터들을 Bi-LSTM 으로 학습하고 골프 스윙의 특징을 고려한 간단한 규칙을 통하여 이상치 데이터를 효과적으로 검출하고 이를 보정하는 방법을 제안한다. 또한 다양한 실험과 분석을 통하여 제안하는 방법이 골프 스윙 모션에서 사람의 자세를 정확히 추정할 수 있음을 보인다.

• The Journal of Korean Academy of Prosthodontics
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• v.58 no.1
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• pp.1-6
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• 2020

Purpose: This study evaluated color stability of Dentca 3D-printed denture teeth, in comparison to color stabilities of four conventional types of denture teeth, upon being immersed in various colorants. Materials and methods: Four types of conventional prefabricated denture teeth (Surpass, GC, Artic 6, Heraeus Kulzer, Premium 6, Heraeus Kulzer, Preference, Candulor), 3D-printed denture teeth (Dentca); and Z250 (Filtek Z250, 3M ESPE) were prepared for testing. The samples were immersed in erythrosine 3%, coffee, cola, and distilled water (DW) at 37℃. Color change (ΔE) was measured by spectrophotometer before immersion and at 7, 14, and 21 days after immersion. One-way analysis of variance was performed along with Tukey's honestly significant difference multiple comparisons test (P<.05). Results: No great difference was observed between the color change of Dentca denture teeth and that of conventional denture teeth in most cases (P>.05). The color change of Dentca denture teeth immersed in erythrosine 3% was greater than that of Surpass (ΔE = 0.67 ± 0.25) after 1 week; Artic 6 (ΔE = 1.44 ± 0.38) and Premium 6 (ΔE = 1.69 ± 0.35) after 2 weeks; and Surpass (ΔE = 1.79 ± 0.49), Artic 6 (ΔE = 2.07 ± 0.21), Premium 6 (ΔE = 2.03 ± 0.75), and Preference (ΔE = 2.01 ± 0.75) after 3 weeks (P<.05). Conclusion: A color change was observed in Dentca denture teeth when immersed in some colorants; however, the maximum value of ΔE for Dentca denture teeth was within the clinically acceptable range.