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T : 목차정보

대한치과보철학회지 = The journal of Korean academy of prost... 7건

  1. [국내논문]   Celay/In-Ceram, Conventional In-Ceram, Empress 2 전부도재관의 변연적합도에 관한 비교 연구   피인용횟수: 6

    양재호 (서울대학교 치과대학 치과보철학교실 ) , 여인성 (서울대학교 치과대학 치과보철학교실 ) , 이선형 (서울대학교 치과대학 치과보철학교실 ) , 한중석 (서울대학교 치과대학 치과보철학교실 ) , 이재봉 (서울대학교 치과대학 치과보철학교실)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 131 - 139 , 2002 , 0301-2875 ,

    초록

    There have been many studies about marginal discrepancy of single restorations made by various systems and materials. But many of statistical inferences are not definite because of sample size, measurement number, measuring instruments. etc. The purpose of this study was to compare the marginal adaptations of the anterior single restorations made by different systems and to consider more desirable statistical methods in analysing the marginal fit. The in vitro marginal discrepancies of three different all-ceramic crown systems (Celay In-Ceram. Conventional In-Ceram. IPS Empress 2 layering technique) and one control group (PFM) were evaluated and compared. The crowns were made from one extracted maxillary central incisor prepared with a 1mm shoulder margin and $6^{\circ}$ taper walls by milling machine. 10 crowns per each system were fabricated. Measurements or a crown were recorded at 50 points that were randomly selected for marginal gap evaluation. Non-parametric statistical analysis was performed for the results. Within the limits of this study, the following conclusions were drawn: 1 Mean gap dimensions and standard deviations at the marginal opening for the maxillary incisor crowns were $98.2{\pm}40.6{\mu}m$ for PFM, $83.5{\pm}18.7{\mu}m$ for Celay In-Ceram, $104.9{\pm}44.1{\mu}m$ for conventional In-Ceram, and $45.5{\pm}11.5{\mu}m$ for IPS Empress 2 layering technique. The IPS Empress 2 system showed the smallest marginal gap (P $100\sim150{\mu}m$ ). 3. When the variable is so controlled that the system may be the only one, mean value is interpreted to be the marginal discrepancy of a restoration which is made by each system and standard deviation is to be technique-sensitivity of each one. 4. From the standard deviations. the copy-milling technique (Celay/In-Ceram) was not considered to be technique-sensitive in comparison with other methods. 5. Parametric analysis is more reliable than non-parametric one in interpretation of the mean and standard deviation. The sample size of each group has to be more than 30 to use parametric statistics. The level of clinically acceptable marginal fit has not been established. Further studies are needed.

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  2. [국내논문]   수종 인상재의 혼합방법에 따른 기포형성과 표면 재현력에 관한 연구  

    류형선 (단국대학교 치과대학 보철학교실 ) , 임헌송 (단국대학교 치과대학 보철학교실 ) , 임주환 (단국대학교 치과대학 보철학교실 ) , 조인호 (단국대학교 치과대학 보철학교실)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 140 - 155 , 2002 , 0301-2875 ,

    초록

    Void-free impression taking is important for the fabrication of accurate dental restorations. One of the essential properties of an impression material used for indirect fabrication of precision castings is the reproduction of the fine detail. The objective in this study was to determine the influence of mixing methods on the number of voids and surface detail reproduction. The number of voids and surface detail reproduction were evaluated with the steteomicroscope $SZ-PT^{(R)}$ and photographed. The results were as follows ; 1. In comparison of the void formation according to mixing methods of all impression materials, mechanical mixing was better than hand mixing and there was significant difference(p $TOKUSO\;A-1{\alpha}^{(R)},\;CAVEX\;IMPRESSIONAL^{(R)},\;AROMA \;FINE\;DF\;III^{(R)}$ ), there was no significant difference among alginate groups. But the number of void was increased in the order of $Panasil^{(R)}\;contact,\;TOKUSO\;A-1{\alpha}^{(R)},\;Permlastic^{(R)}$ light bodied and there was significant difference (p $TOKUSO\;A-1{\alpha}^{(R)},\;CAVEX\;IMPRESSIONAL^{(R)},\;AROMA FINE\;DF\;III^{(R)}$ ), there was no significant different among alginate groups. But the number of void was decreased in order of $TOKUSO\;A-1{\alpha}^{(R)},\;Permlastic^{(R)}light\;bodied,\;Panasil^{(R)}$ contact and there was significant difference (p $TOKUSO\;A-1{\alpha}^{(R)},\;Permlastic^{(R)}\;light\;bodied,\;Panasil^{(R)}\;contact$ ), there was no significant difference between hand mixing and mechanical mixing method 5. The surface detail reproduction was only influenced by impression materials, and produced better in order of $TOKUSO\;A-1{\alpha}^{(R)},\;Panasil^{(R)}\;contact,\;Permlastic^{(R)}$ light bodied. There was significat difference among 3 type of impression materials(p

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  3. [국내논문]   일체주조법, 레이저용접법, 납착법, 방전가공법에 의해 제작된 임플란트 보철물의 적합도에 관한 연구   피인용횟수: 1

    설영훈 (부산대학교 치과대학 치과보철학교실 ) , 정창모 (부산대학교 치과대학 치과보철학교실 ) , 전영찬 (부산대학교 치과대학 치과보철학교실 ) , 강성원 (부산대학교 공과대학 조선해양공학과)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 156 - 171 , 2002 , 0301-2875 ,

    초록

    The purpose of this study was to measure and compare the strains produced by screw-tightening implant frameworks fabricated by aye different fabrication methods; (1) one-piece cast using plastic sleeve, (2) one-piece cast using gold cylinder, (3) laser welding, (4) soldering, and (5) electrical discharge machining, and also to measure and compare the strains produced when the order of screw tightening was changed A research model incorporating eighteen strain gages was made to measure the fit of implant frameworks in three dimensions. Three implants aligned in an arc were fixed on the top ends of the L-shape aluminum bars of the research model, and standard abutments were joined to the implants with abutment screws. Five types of implant framework were placed on the abutments and screwed by a torque wrench using 10 Ncm. Under the conditions of this study, the following conclusions were drawn: 1. The electrical discharge machining group showed the smallest magnitude of strain, followed by the soldering group, the laser welding group, the one-piece cast group using gold cylinder, and the one-piece cast group using plastic sleeve. However, among the magnitude of strain for the remaining groups except the electrical discharge machining group, there were not significant differences. 2. When the order of screw tightening was changed, there were not significant differences in the magnitude of strain. 3. In comparison with the electrical discharge machining group, the laser welding group and the one-piece cast groups showed greater horizontal distortion and the soldering group showed greater horizontal and vertical distortion.

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  4. [국내논문]   잇솔질이 도재의 색 안정성에 미치는 영향   피인용횟수: 1

    이임기 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소 ) , 정준오 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소 ) , 박찬운 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 172 - 183 , 2002 , 0301-2875 ,

    초록

    This study is going to compare the degree of color change which occurs in the following two cases of the factors which cause the color change of extra-staining, one is during glazing by the dental technician, the other is tooth brush abrasion which makes the biggest influence on color change. To compare the degree of color change before and after glazing, a sample was made with vintage incisal porcelain No. 59 OPAL(Shofu Inc, Japan), after that it was painted with three colors of porcelain stainers, then the degree of color was measured with a spectrophometer(Model Chromaview 300, Spectoron Tech Co. Korea) after it had been treated with firing only and glazing after firing 40,000-cycle and 80,000-cycle of tooth brush abrasion test were carried out in order to simulate the brushing effect of 4 years and 8 years by using the abrasion tester. The colors were measured before the test, and after the 40,000-cycle and 80.000-cycle operations and the surfaces were examined by SEM. The results of this study were as follows ; 1. The color change before and after glazing was not great enough to have a clinical significance but the orange color was changed more significantly statistically than the blue and light brown(p

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  5. [국내논문]   수종 치과용 석고의 마모저항도 및 표면조도에 관한 비교 연구  

    심혜원 (강릉대학교 구강과학연구소 ) , 이양진 (강릉대학교 구강과학연구소 ) , 조리라 (강릉대학교 구강과학연구소 ) , 정경호 (수원대학교 공과대학 고분자.화학공학부 ) , 김경남 (연세대학교 치과대학 치과재료학연구소)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 184 - 192 , 2002 , 0301-2875 ,

    초록

    The purpose of this study was to investigate the abrasion resistance and surface roughness of conventional dental stones and improved dental stones and newly developed dental stones. Materials included in this study were several dental stones and newly developed dental stone; 2 type III. 6 type IV (including newly developed dental stone). 1 type V Ten specimens for each material, total ninety specimens were made. Each specimen was subjected to 50 complete cycle abrasion under constant load 0.42N at speed or 6mm per sec. The depth after abrasion test was measured for each specimen. Surface roughness before and after abrasion test was compared. The results were as follows ; 1. The resin containing die materials such as Tuff Rock and Resin Rock had superior abrasion resistance. 2. Type IV, V dental stone exhibited greater abrasion resistance than Type III dental stone. 3. The results or the surface roughness showed similar pattern with the abrasion resistance.

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  6. [국내논문]   임플랜트 유지 나사 머리 홈의 설계가 나사를 푸는 시간에 미치는 영향에 관한 연구  

    이재봉 (서울대학교 치과대학 보철학교실)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 193 - 200 , 2002 , 0301-2875 ,

    초록

    For the purpose of decreasing the chair time in implant cases, the time needed to loosening and fastening the screw must be shortened. Nowadays, the two typical designs of screw head are slot and hexa form. This study aimed at the shortening of loosening and fastening time by modifying the slot and hexa form. Total of twelve dentists participate in these experiments, four of them were experienced and eight of them were novice dentists. 1. There were many differences in the speeds of screw loosening and fastening between personal experiences. Experienced dentists are faster than novice dentists. 2. There were many differences in the speeds by angulation of the implant, by the conditions of the muscle tonicity. 3. Revised slot and hexa Heads show the slightly shortened time for acrew looseing and fastening.

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  7. [국내논문]   의치용 레진치와 수복용 복합레진 간의 결합강도에 관한 연구   피인용횟수: 1

    김미리 (부산대학교 치과대학 보철학교실 ) , 정창모 (부산대학교 치과대학 보철학교실 ) , 전영찬 (부산대학교 치과대학 보철학교실 ) , 임장섭 (부산대학교 치과대학 보철학교실)
    대한치과보철학회지 = The journal of Korean academy of prosthodontics v.40 no.2 ,pp. 201 - 212 , 2002 , 0301-2875 ,

    초록

    This study investigated the shear bond strengths between abrasion-resistant denture teeth and composite resins according to surface treatments. Denture teeth for this study were Trubyte IPN teeth(Dentsply Inc., USA) with interpenetrating polymer network and Endura Posterio (Shofu Inc. Japan) of composite resin teeth, and restorative composite resins were Clearfil FII (Kuraray, Japan) of the self-cured composite resin and Z100(3M Dental Product, USA) of the light-cured composite resin. Five different surface treatments were evaluated: (1) $50{\mu}m\;A1_2O_3$ sandblasting: (2) #100 carbide paper; (3) chloroform; (4) retentive holes; and (5) no treatment. After surface treatments, denture teeth were examined by scanning electron microscopy(SEM), and the maximum shear bond strengths between abrasion-resistant denture teeth and composite resins were measured using Instron. The results were as follows; 1. IPN teeth treated with sandblasting had the highest shear bond strength, and Endura treated with sandblasting and carbide paper had significantly greater shear bond strength than with any other surface treatment. 2. Regardless or composite resins, the shear bond strength on Endura was greater than on IPN teeth. 3. Regardless of denture teeth, the shear bond strength of Clearfil FII was greater han of Z100. 4. In appearance of SEM, IPN teeth treated with sandblasting showed generalized roughness on the all of surface, however, carbide paper treatment resulted in partly rough. Endura treated with sandblasting and carbide paper showed similar surface characteristics. Wetting denture teeth surface with chloroform removed the debris and created a particle-free and smooth surface.

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