• Title/Summary/Keyword: Mix-Method

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Guided Bone Regeneration using Fibrin Glue in Dehiscence or Fenestration Defects Occurred by Maxillary Anterior Implants: Case Report (상악 전치부 임플란트 식립에 의한 열개 및 천공형 골결손 발생 시 조직 접착제를 이용한 골유도 재생술: 증례보고)

  • Chee, Young-Deok;Seon, Hwa-Gyeong
    • Journal of Dental Rehabilitation and Applied Science
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    • v.28 no.3
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    • pp.277-290
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    • 2012
  • Dental implants are universal restorative method on edentulous site in oral cavity and generally recognized by patients as well as clinicians. Rapid bone resorption of labial portion of maxillary anterior area is performed due to dental trauma, chronic periodontitis, and so on. Accordingly, Implants on maxillary anterior alveolar ridge with narrow labiopalatal width would lead to bony defects of dehiscence or fenestration. In this case, guided bone regeneration procedure is used to augment maxillary anterior alveolar ridge. It can have mechanical and biological advantages to mix tissue adhesive with bone graft materials in guided bone regeneration procedure. In these cases, when the dehiscence or fenestration defects was occurred by dental implants on maxillary anterior alveolar ridge with narrow labiopalatal width, guided bone regeneration procedures were performed with various combination of particle bone graft materials(allograft, xenograft, and alloplast) mixed with fibrin glue, excepting autogerous bone. We reported that all of 4 cases showed favorable alveolar ridge augmentations.

Effects of Cement Fineness Modulus (CFM) on the Fundamental Properties of Concrete (시멘트 입도계수(CFM)가 콘크리트의 기초적 특성에 미치는 영향)

  • Noh, Sang-Kyun;Han, Cheon-Goo
    • Journal of the Korea Institute of Building Construction
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    • v.12 no.3
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    • pp.284-290
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    • 2012
  • Cement Fineness Modulus (CFM) is a method of expressing the distribution of particle sizes of cement in numeric form. If CFM is controlled through crush process of cement without modifying the chemical components or mineral composition of cement, it is judged to be able to produce a cement satisfying various requirements because it is estimated to enable various approaches to cement such as high early strength, moderate heat, low heat cement and so on. Therefore, in this study, as basic research for manufacturing special cement utilizing the controls of CFM, the intention was to review the impacts of CFM on the fundamental properties of concrete. To summarize the result, as mixture characteristics of fresh concrete, ratio of small aggregate and unit quantity were gradually increased, securing greater fluidity, with an increase in CFM, while the amount of AE and SP were reduced gradually. In addition, setting time was delayed as CFM increased. Furthermore, compression strength was relatively high during initial aging as CFM became smaller, but as time passed, compression strength became smaller, and it showed the same level of strength as aging time passed about three years.

WETTABILITY OF POLYVINYLSILOXANE IMPRESSION MATERIALS AND IMPROVED STONE MATERIALS (부가중합 실리콘 인상재 및 모형재의 젖음성에 관한 비교 연구)

  • Cho, Lee-Ra;Chung, Kyung-Ho;Kim, Kyoung-Nam
    • The Journal of Korean Academy of Prosthodontics
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    • v.38 no.2
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    • pp.191-199
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    • 2000
  • Wettability of addition silicone impression material is very important property for making an accurate restoration. This study examined the impression quality in clinical condition and the wettability of impression and die material. Four commercially available addition silicone impression material (Express, Examix, Contrast, Perfect) and three die materials (Die-Keen, Vel-Mix, Fuji-Rock) were studied. A total of 50 putty/wash and heavy body/wash impressions of wet intact permanent molar teeth were examined for definition of the gingival sulcus reproduction and then classified in quality ranking. The percentage of the sulcus reproduction ability of each material was calculated from the sulcus depths of cross-sectioned epoxy resin casts from the impressions and clinically measured sulcus depths, The same impression materials were used to produce 3 groups of die stone casts form void entrapment die had been exposed to milk. Voids in the impression body and stone casts ere counted under a stereoscopic microscope. From the experiment, the following results were obtained : 1. Sulcus reproduction ability of additional silicone impression material were diminished in order of Express, Examix, Perfect, Contrast. The significant difference was found between Perfect and other material. Heavy body/wash combination was superior In putty/wash method n Perfect impression material. 2. In direct observation, Contrast showed least void in impression body but correlations ere not found between sulcus reproduction and void production. 3. In void entrapment laboratory test, wettability were diminished in order of Examix, Contrast, Express, Perfect. Clinical impression recording seems not to correlate with laboratory test. 4. The wettability of die material to impression material was not different in Express, Examix, Contrast. But, in Perfect, Die-Keen had superior wettability to others.

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Evaluate the Concrete mix by Type Accelerated Corrosion Test and Chloride Penetration Analysis with Artificial Seawater Cyclic Wet and Dry Condition (인공해수 건습반복조건에 따른 콘크리트배합별 부식촉진시험법과 염화물 침투해석평가)

  • Park, Sang-Soon;Kim, Min-Wook
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.1 no.3
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    • pp.211-218
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    • 2013
  • Cyclic wet and dry conditions in the marine environment structures corrosion is known to be the fastest rising. For that reason, accelerated corrosion test methods for the reproduction of tidal environment has been actively conducted. However, many studies have estimated threshold value for steel corrosion or concentrated in chloride penetration analysis. In this study, cyclic wet and dry conditions to reproduce the structure of the environment in accelerated corrosion and chloride penetration test analysis was performed. Corrosion was determined by the result of reinforcement corrosion monitoring based on galvanic potential measurement and half-cell potential method. Accelerated corrosion test results for each formulation was different corrosion periods, the order OPC> FA> BS> High-strength concrete. FEM durability interpretation program DuCOM was conducted under the same conditions as in accelerated corrosion test. The experimental RCPT tests demonstrated the validity of the result.

Detonation Initiation via Surface Chemical Reaction of Laser-Ablated Aluminum Sample (표면화학 반응을 통한 Laser-Ablated 알루미늄의 Detonation 현상 연구)

  • Kim, Chang-Hwan;Yoh, Jai-Ick
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.2
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    • pp.197-204
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    • 2012
  • We explore the evolution of metal plasma generated by high laser irradiances and its effect on the surrounding air by using shadowgraph images after laser pulse termination and X-ray diffraction (XRD) of aluminum plasma ablated by a high-power laser pulse (>1000 mJ/pulse) and oxygen from air. Hence, the formation of laser-supported detonation and combustion processes has been investigated. The essence of this paper is in observing the initiation of chemical reaction between the ablated aluminum plasma and oxygen from air by the high-power laser pulse (>1000 mJ/pulse) and in conducting a quantitative comparison of the chemically reactive laser-initiated waves with the classical detonation of an exploding aluminum (dust) cloud in air. The findings in this work may lead to a new method of initiating detonation from a metal sample in its bulk form without any need to mix nanoparticles with oxygen for initiation.

Flow and Combustion Characteristic in an Array of Multiple Pre-Mixed Methane/Air Flame Jets (메탄/공기 다중 제트 예혼합 화염에서의 유동과 연소특성)

  • Kim, Young-Su;Lee, Dae-Rae;Ha, Man-Yeong;Chang, Young-June;Jeon, Chung-Hwan;Cho, Seung-Wan;Kang, Kil-Young;Yu, Jae-Hyun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.31 no.6 s.261
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    • pp.547-557
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    • 2007
  • This study was conducted to investigate the flow and combustion characteristic of the experimental burner which was manufactured for the reflection of the oven and broil burner features. As slot shape, spacing between slots, and slot arrangement of the exit area which emits the mixing gas are different in case of oven burners and broil turners, the purpose of this study is to know the affection of the flame interaction and combustion characteristic according to the change of shape factors such as slot shape, slot arrangement, and slot-to-slot spacing. With no relation of the slot shape, as the spacing between slots became narrow, the occurrence of a lift-flame was delayed. So the combustion was possible in the leaner region, but the appearance of yellow-tip became a little fast. Slit slot port had the broadest operating range among the other slot shapes. Specially, from the side of lift-flame, as the jet that spreads downstream in the longitudinal slot was nearly circular just a few slot lengths away from the orifice, slot-to-slot spacing of the Slit port was closer than the other ports. These results could be expected through the computer numerical method and had a good agreement. As the spacing between slots increased, in case of Slit and Mix port, NOx emission rate was constant or decreased, but the NOx emission of Hole port was increased. CO emission rate of Slit and Hole port was increased as the slot-to-slot spacing was broadened.

A Study on the Development of Color Pavement (칼라포장(鋪裝) 개발(開發)에 관한 연구(研究))

  • Kim, Ju Won;Kim, Dae Woong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.2 no.2
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    • pp.11-18
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    • 1982
  • The binder for hot mix type colored pavement must have the same physical qualities as the straight asphalt cement, but its color must not be dark-brown. We developed a kind of synthetic resin binder with light yellow color and confirmed its possibility as a binder for colored pavement through the several comparison tests between the straight asphalt cement concrete mixture and the mixture of binder and aggregate for colored pavement. For the pigment, it has been assured through tests that home products have the possiblities to be used. The binder has come to the stage of practical use through the trial mixing by asphalt mixing plant and the trial field placing. The mixing operation and the paving method of colored mixture are same as normal asphalt concrete mixture, but the quantity of pigment replaces that of mineral filler. The required content of pigment is decided by the trial mixing with other materials to be used.

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Evaluation on Ruminant Feed Value of Cage Broiler Excreta Processed by a Deepstacking Method (퇴적발효한 케이지 육계생분의 반추동물 사료적 가치 평가)

  • 곽완섭;박종문;김연호;강준석;김영일;김원경
    • Journal of Animal Environmental Science
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    • v.9 no.2
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    • pp.113-122
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    • 2003
  • This on­farm study was conducted to evaluate the effect of feeding deepstacked broiler excreta­saw dust­rice hulls(DBSR) pellets on feed intake, production and economy of growing Hanwoo steers and Holstein bulls. Formulated mix and rice straw were replaced at 16% and 48% levels for growing Hanwoo steers(6 wk of feeding period) and at 4% and 18% levels for Holstein bulls(12 wk) with DBSR pellets. Control and treated diets were formulated to be isoenergetic and DBSR pellets were fed ad libitum. Palatability of DBSR pellets turned out to be favorable. Compared with the control group, feeding DBSR pellets did not affect body weight gain, average daily gain and feed efficiency(P>0.05). Feed cost per gain was reduced by 18.5% for Hanwoo steers and 3.5% for Holstein bulls. Feeding DBSR pellets to Holstein bulls did not affect carcass weight and grades of meat yield and quality. These results indicate that deepstacked cage broiler excreta mixture may be effectively used as a feed ingredient for growing ruminants.

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Sensory and Texture Properties of Gamdanja (감단자의 관능적 및 텍스쳐 특성)

  • Lee Hyo-Gee;Baek Hyun-Nam;Kim Jung-Won
    • Korean journal of food and cookery science
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    • v.20 no.6 s.84
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    • pp.650-657
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    • 2004
  • The objective of this study was to seek the best recipe for making Gamdanja. Gamdanja is a kind of rice cake made from persimmon extract and winy flour, with a little salt mixed into the waxy flour. The method involved boiling the persimmon extract and beating in the waxy rice powder until all the waxy flour had been added. The procedure was as follows: Gamdanja containing different ratios of ingredients, such as persimmon extract (23, 23.5 and 24 hrs) and waxy rice flour (160 and 180g). The most desirable recipe was determined after sensory examination and mechanical tests using texture, moisture content and colorimeter measurements. The results of the sensory evaluation showed that Gamdanja made using persimmon extracted for 23.5 hrs, with the additional of 160g of winy flour gave the higher scores for QDA profile, chewiness, delicacy and after swallowing preference than the other ratios. The results of the acceptance test also showed that the Gamdanja made using the persimmon extracted for 23.5 hrs with 160g of waxy rice flour was the best mix in every respect, such as for color and overall acceptability. In the textural analysis of Gamdanja, the hardness, adhesiveness, gumminess and chewiness were increased by the additiong of furtherway lour. The moisture content of Gamdnja with persimmon extracted for 23 hrs was higher an those extracted for 23.5 and 24 hrs. The L-, a- and values of Gamdanja were increased with decreasing waxy flour. The sensory and mechanical examinations showed the overall quality of Gamdanja had positive correlations with delicacy and color, but negative correlations with hardness, adhesiveness, gumminess, and chewiness. As a result of these tests, the most desirable recipe for the Gamdanja was persimmon extracted for 23.5 hrs with the additional of 160g of waxy rice flour, containing $1\%$ salt and a moisture content of $45.87\%$.

Identification of Pork Adulteration in Processed Meat Products Using the Developed Mitochondrial DNA-Based Primers

  • Ha, Jimyeong;Kim, Sejeong;Lee, Jeeyeon;Lee, Soomin;Lee, Heeyoung;Choi, Yukyung;Oh, Hyemin;Yoon, Yohan
    • Food Science of Animal Resources
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    • v.37 no.3
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    • pp.464-468
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    • 2017
  • The identification of pork in commercially processed meats is one of the most crucial issues in the food industry because of religious food ethics, medical purposes, and intentional adulteration to decrease production cost. This study therefore aimed to develop a method for the detection of pork adulteration in meat products using primers specific for pig mitochondrial DNA. Mitochondrial DNA sequences for pig, cattle, chicken, and sheep were obtained from GenBank and aligned. The 294-bp mitochondrial DNA D-loop region was selected as the pig target DNA sequence and appropriate primers were designed using the MUSCLE program. To evaluate primer sensitivity, pork-beef-chicken mixtures were prepared as follows: i) 0% pork-50% beef-50% chicken, ii) 1% pork-49.5% beef-49.5% chicken, iii) 2% pork-49% beef-49% chicken, iv) 5% pork-47.5% beef-47.5% chicken, v) 10% pork-45% beef-45% chicken, and vi) 100% pork-0% beef-0% chicken. In addition, a total of 35 commercially packaged products, including patties, nuggets, meatballs, and sausages containing processed chicken, beef, or a mixture of various meats, were purchased from commercial markets. The primers developed in our study were able to detect as little as 1% pork in the heat treated pork-beef-chicken mixtures. Of the 35 processed products, three samples were pork positive despite being labeled as beef or chicken only or as a beef-chicken mix. These results indicate that the developed primers could be used to detect pork adulteration in various processed meat products for application in safeguarding religious food ethics, detecting allergens, and preventing food adulteration.