• Restorative Dentistry and Endodontics
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• 제43권1호
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• pp.6.1-6.2
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• 2018

• Restorative Dentistry and Endodontics
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• 제44권1호
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• pp.12.1-12.1
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• 2019

• Restorative Dentistry and Endodontics
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• 제45권1호
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• pp.16.1-16.2
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• 2020

• Restorative Dentistry and Endodontics
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• 제46권1호
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• pp.15.1-15.3
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• 2021

• Restorative Dentistry and Endodontics
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• 제49권1호
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• pp.11.1-11.3
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• 2024

• 한국세라믹학회지
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• 제47권5호
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• pp.373-380
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• 2010

In this study, we studied on the durability of restorative cement mortar for deteriorated concrete at complex deteriorated conditions as variation of temperature and of humidities. We made a comparison between restorative materials with insulation function and restorative materials without insulation function in items of compressive and bending strength and permeability of water, durability for carbonation, salt damage, diffusion coefficient of salt at complex deterioration conditions like change of temperature, change of humidity, For insulation, we used close-pore type Alumino-Silicate lightweight aggregate and substituted 12 wt% and 15 wt% out of original restorative cement mortar without insulation function. As a result, it was found that original restorative cement mortar without insulation function fail to meet Korean Standard on polymer modified cement mortar for maintenance in concrete structure, but restorative cement mortar with insulation function is in contentment Korean Standard to meet excellent than restorative materials without insulation function for durability at complex deteriorated conditions.

• 한국조경학회지
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• 제34권5호
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• pp.1-13
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• 2006

The Attention Restoration Theory (ART) developed by Kaplan and Kaplan proposes that effortful directed attention required in normal life can be fatigued. Restoration can occur in a setting that has restorative qualities. The restorative quality described by the ART involves four concepts: being away, fascination extent, and compatibility. The purpose of this study was to investigate how the restorative quality of landscape influenced the preferences and satisfaction of visitors to an heritage landscape. Four kinds of heritage landscapes of Kyongju were used as environmental surrogates and 150 americans participated in the study. Hartig et al.'s Revised Perceived Restorativeness Scale (RPRS) was used as the psychological measure for the restorative quality, along with other measurement constructs such as cultural uniqueness and novelty. The results showed that RPRS was a reliable measurement tool for assessing the restorative quality of artificial landscapes. Factor analysis identified three valid factors: escape-fascination compatibility, anti-extent. Among the three factors, only two, escape-fascination and compatibility, were found to have important effects on visiting preference and satisfaction. Specifically, higher levels of preference and satisfaction were associated with higher levels of escape-fascination and compatibility. The results indicate that the restorative quality has a high possibility to be used as a frame of reference for assessing various types of landscapes, from natural to artificial. It was also proposed that restorative quality could better explain the experience of the landscape strongly related to specific purpose or motivation.

• Restorative Dentistry and Endodontics
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• 제38권3호
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• pp.146-153
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• 2013

Objectives: Aluminum step wedge (ASW) equivalent radiodensity (eRD) has been used to quantify restorative material's radiodensity. The aim of this study was to evaluate the effects of image acquisition control (IAC) of a digital X-ray system on the radiodensity quantification under different exposure time settings. Materials and Methods: Three 1-mm thick restorative material samples with various opacities were prepared. Samples were radiographed alongside an ASW using one of three digital radiographic modes (linear mapping (L), nonlinear mapping (N), and nonlinear mapping and automatic exposure control activated (E)) under 3 exposure time settings (underexposure, normal-exposure, and overexposure). The ASW eRD of restorative materials, attenuation coefficients and contrasts of ASW, and the correlation coefficient of linear relationship between logarithms of gray-scale value and thicknesses of ASW were compared under 9 conditions. Results: The ASW eRD measurements of restorative materials by three digital radiographic modes were statistically different (p = 0.049) but clinically similar. The relationship between logarithms of background corrected grey scale value and thickness of ASW was highly linear but attenuation coefficients and contrasts varied significantly among 3 radiographic modes. Varying exposure times did not affect ASW eRD significantly. Conclusions: Even though different digital radiographic modes induced large variation on attenuation of coefficient and contrast of ASW, E mode improved diagnostic quality of the image significantly under the underexposure condition by improving contrasts, while maintaining ASW eRDs of restorative materials similar. Under the condition of this study, underexposure time may be acceptable clinically with digital X-ray system using automatic gain control that reduces radiation exposure for patient.

• Imaging Science in Dentistry
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• 제51권3호
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• pp.261-269
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• 2021

Purpose: The aim of this study was to evaluate the radiopacities of various types of restorative materials with different thicknesses compared with enamel, dentin, and aluminum. Materials and Methods: Four bulk-fill resins, 2 hybrid ceramics, 2 micro-hybrid resin composites, 6 glass ionomer-based materials, 2 zinc phosphate cements, and an amalgam were used in the study. Twelve disk-shaped specimens were prepared from each of 17 restorative materials with thicknesses of 1 mm, 2 mm, and 4 mm (n=4). All the restorative material specimens with the same thickness, an aluminum (Al) step wedge, and enamel and dentin specimens were positioned on a phosphor storage plate and exposed using a dental X-ray unit. The mean gray values were measured on digital images and converted to equivalent Al thicknesses. Statistical analyses were performed using 2-way analysis of variance and the Bonferroni post hoc test(P<0.05). Results: Radiopacity was significantly affected by both the thickness and the material type (P<0.05). GCP Glass Fill had the lowest radiopacity value for samples of 1 mm thickness, while Vita Enamic had the lowest radiopacity value for 2-mm-thick and 4-mm-thick samples. The materials with the highest radiopacity values after the amalgam were zinc phosphate cements. Conclusion: Significant differences were observed in the radiopacities of restorative materials with different thicknesses. Radiopacity was affected by both the material type and thickness.

• 한국조경학회지
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• 제41권4호
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• pp.68-76
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• 2013

의도된 집중력은 환경에 의해 장기간 요구되면 피로하게 된다. Kaplan과 Kaplan의 집중력 회복이론(ART)에서는 피로한 의도된 집중력은 치유경관에 의해 회복된다고 주장된다. 네 가지 치유특질은 탈출감, 경관의 매력, 경관의 공간감, 그리고 적합성이다. ART에서는 다양한 경관이 치유효과를 유발할 수 있다고 인정하고 있지만, 지금까지 경관의 치유효과는 자연경관과 도시경관의 두 가지 차원에서 연구되어 왔다. 본 연구의 목적은 본 연구의 목적은 두 가지로 첫째, 전통경관을 대상으로 한국형 PRS를 개발하고, 두 번째, 전통경관의 치유특질이 방문경험에 미치는 영향을 조사하는 것이다. 본 연구는 안압지에서 수행되었으며, 200명의 안압지 방문자가 설문조사에 참여하였다. Hartig 등의 PRS(Perceived Restorativeness Scale)가 경관의 치유성을 평가하기 위한 측정도구로 사용되었다. 분석결과는 다음과 같이 요약된다. 1) PRS는 역사지역에 대한 한국인의 평가에 매우 신뢰성 있는 측정도구로 밝혀졌다. 특히, 요인분석에서는 네 가지 요인이 도출되었는데, 이는 ART를 뒷받침하고 있다. 2) 경관의 장소성은 치유효과에 긍정적인 영향이 있는 것으로 나타났다. 3) 경관의 아름다움은 비록 경관의 장소성이 경관치유에 미치는 영향보다는 작지만, 긍정적인 영향이 있는 것으로 분석되었다. 4) 네 가지 경관치유특질 중에서 세 가지 특질(경관의 매력, 탈출감, 적합성)이 방문만족과 재방문의사에 영향을 미치는 것으로 나타났으며, 상대적인 중요도의 순서는 경관의 매력, 탈출감, 적합성으로 분석되었다. 연구결과에 근거하면, 앞으로의 연구에서는 PRS의 신뢰성을 재 검증하기 위한 연구가 필요한 것으로 나타난다. 또한 장소성과 경관의 치유효과의 관계성을 밝히기 위한 연구도 필요한 것으로 판단된다.